vfs_syscalls.c revision 1.172
1 /* $NetBSD: vfs_syscalls.c,v 1.172 2001/10/29 07:02:31 simonb 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 #include <sys/sysctl.h> 60 #include <sys/syscallargs.h> 61 62 #include <miscfs/genfs/genfs.h> 63 #include <miscfs/syncfs/syncfs.h> 64 65 static int change_dir __P((struct nameidata *, struct proc *)); 66 static int change_flags __P((struct vnode *, u_long, struct proc *)); 67 static int change_mode __P((struct vnode *, int, struct proc *p)); 68 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 69 int)); 70 static int change_utimes __P((struct vnode *vp, const struct timeval *, 71 struct proc *p)); 72 static int rename_files __P((const char *, const char *, struct proc *, int)); 73 74 void checkdirs __P((struct vnode *)); 75 76 int dovfsusermount = 0; 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 #if defined(COMPAT_09) || defined(COMPAT_43) 87 /* 88 * This table is used to maintain compatibility with 4.3BSD 89 * and NetBSD 0.9 mount syscalls. Note, the order is important! 90 * 91 * Do not modify this table. It should only contain filesystems 92 * supported by NetBSD 0.9 and 4.3BSD. 93 */ 94 const char * const mountcompatnames[] = { 95 NULL, /* 0 = MOUNT_NONE */ 96 MOUNT_FFS, /* 1 = MOUNT_UFS */ 97 MOUNT_NFS, /* 2 */ 98 MOUNT_MFS, /* 3 */ 99 MOUNT_MSDOS, /* 4 */ 100 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 101 MOUNT_FDESC, /* 6 */ 102 MOUNT_KERNFS, /* 7 */ 103 NULL, /* 8 = MOUNT_DEVFS */ 104 MOUNT_AFS, /* 9 */ 105 }; 106 const int nmountcompatnames = sizeof(mountcompatnames) / 107 sizeof(mountcompatnames[0]); 108 #endif /* COMPAT_09 || COMPAT_43 */ 109 110 /* ARGSUSED */ 111 int 112 sys_mount(p, v, retval) 113 struct proc *p; 114 void *v; 115 register_t *retval; 116 { 117 struct sys_mount_args /* { 118 syscallarg(const char *) type; 119 syscallarg(const char *) path; 120 syscallarg(int) flags; 121 syscallarg(void *) data; 122 } */ *uap = v; 123 struct vnode *vp; 124 struct mount *mp; 125 int error, flag = 0; 126 char fstypename[MFSNAMELEN]; 127 struct vattr va; 128 struct nameidata nd; 129 struct vfsops *vfs; 130 131 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 132 return (error); 133 /* 134 * Get vnode to be covered 135 */ 136 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 137 SCARG(uap, path), p); 138 if ((error = namei(&nd)) != 0) 139 return (error); 140 vp = nd.ni_vp; 141 /* 142 * A lookup in VFS_MOUNT might result in an attempt to 143 * lock this vnode again, so make the lock resursive. 144 */ 145 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 146 if (SCARG(uap, flags) & MNT_UPDATE) { 147 if ((vp->v_flag & VROOT) == 0) { 148 vput(vp); 149 return (EINVAL); 150 } 151 mp = vp->v_mount; 152 flag = mp->mnt_flag; 153 vfs = mp->mnt_op; 154 /* 155 * We only allow the filesystem to be reloaded if it 156 * is currently mounted read-only. 157 */ 158 if ((SCARG(uap, flags) & MNT_RELOAD) && 159 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 160 vput(vp); 161 return (EOPNOTSUPP); /* Needs translation */ 162 } 163 /* 164 * In "highly secure" mode, don't let the caller do anything 165 * but downgrade a filesystem from read-write to read-only. 166 * (see also below; MNT_UPDATE is required.) 167 */ 168 if (securelevel >= 2 && 169 (SCARG(uap, flags) != 170 (mp->mnt_flag | MNT_RDONLY | 171 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 172 vput(vp); 173 return (EPERM); 174 } 175 mp->mnt_flag |= 176 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 177 /* 178 * Only root, or the user that did the original mount is 179 * permitted to update it. 180 */ 181 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 182 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 183 vput(vp); 184 return (error); 185 } 186 /* 187 * Do not allow NFS export by non-root users. For non-root 188 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 189 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 190 */ 191 if (p->p_ucred->cr_uid != 0) { 192 if (SCARG(uap, flags) & MNT_EXPORTED) { 193 vput(vp); 194 return (EPERM); 195 } 196 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 197 if (flag & MNT_NOEXEC) 198 SCARG(uap, flags) |= MNT_NOEXEC; 199 } 200 if (vfs_busy(mp, LK_NOWAIT, 0)) { 201 vput(vp); 202 return (EPERM); 203 } 204 VOP_UNLOCK(vp, 0); 205 goto update; 206 } else { 207 if (securelevel >= 2) { 208 vput(vp); 209 return (EPERM); 210 } 211 } 212 /* 213 * If the user is not root, ensure that they own the directory 214 * onto which we are attempting to mount. 215 */ 216 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 217 (va.va_uid != p->p_ucred->cr_uid && 218 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 219 vput(vp); 220 return (error); 221 } 222 /* 223 * Do not allow NFS export by non-root users. For non-root users, 224 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 225 * mount point is already MNT_NOEXEC. 226 */ 227 if (p->p_ucred->cr_uid != 0) { 228 if (SCARG(uap, flags) & MNT_EXPORTED) { 229 vput(vp); 230 return (EPERM); 231 } 232 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 233 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 234 SCARG(uap, flags) |= MNT_NOEXEC; 235 } 236 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 237 return (error); 238 if (vp->v_type != VDIR) { 239 vput(vp); 240 return (ENOTDIR); 241 } 242 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 243 if (error) { 244 #if defined(COMPAT_09) || defined(COMPAT_43) 245 /* 246 * Historically filesystem types were identified by number. 247 * If we get an integer for the filesystem type instead of a 248 * string, we check to see if it matches one of the historic 249 * filesystem types. 250 */ 251 u_long fsindex = (u_long)SCARG(uap, type); 252 if (fsindex >= nmountcompatnames || 253 mountcompatnames[fsindex] == NULL) { 254 vput(vp); 255 return (ENODEV); 256 } 257 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 258 #else 259 vput(vp); 260 return (error); 261 #endif 262 } 263 #ifdef COMPAT_10 264 /* Accept `ufs' as an alias for `ffs'. */ 265 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 266 strncpy(fstypename, "ffs", MFSNAMELEN); 267 #endif 268 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 269 vput(vp); 270 return (ENODEV); 271 } 272 if (vp->v_mountedhere != NULL) { 273 vput(vp); 274 return (EBUSY); 275 } 276 277 /* 278 * Allocate and initialize the file system. 279 */ 280 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 281 M_MOUNT, M_WAITOK); 282 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 283 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 284 (void)vfs_busy(mp, LK_NOWAIT, 0); 285 mp->mnt_op = vfs; 286 vfs->vfs_refcount++; 287 mp->mnt_vnodecovered = vp; 288 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 289 mp->mnt_unmounter = NULL; 290 update: 291 /* 292 * Set the mount level flags. 293 */ 294 if (SCARG(uap, flags) & MNT_RDONLY) 295 mp->mnt_flag |= MNT_RDONLY; 296 else if (mp->mnt_flag & MNT_RDONLY) 297 mp->mnt_flag |= MNT_WANTRDWR; 298 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 299 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 300 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 301 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 302 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 303 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 304 MNT_SYMPERM | MNT_SOFTDEP); 305 /* 306 * Mount the filesystem. 307 */ 308 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 309 if (mp->mnt_flag & MNT_UPDATE) { 310 vrele(vp); 311 if (mp->mnt_flag & MNT_WANTRDWR) 312 mp->mnt_flag &= ~MNT_RDONLY; 313 mp->mnt_flag &=~ 314 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 315 if (error) 316 mp->mnt_flag = flag; 317 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 318 if (mp->mnt_syncer == NULL) 319 error = vfs_allocate_syncvnode(mp); 320 } else { 321 if (mp->mnt_syncer != NULL) 322 vfs_deallocate_syncvnode(mp); 323 } 324 vfs_unbusy(mp); 325 return (error); 326 } 327 /* 328 * Put the new filesystem on the mount list after root. 329 */ 330 cache_purge(vp); 331 if (!error) { 332 vp->v_mountedhere = mp; 333 simple_lock(&mountlist_slock); 334 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 335 simple_unlock(&mountlist_slock); 336 checkdirs(vp); 337 VOP_UNLOCK(vp, 0); 338 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 339 error = vfs_allocate_syncvnode(mp); 340 vfs_unbusy(mp); 341 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 342 if ((error = VFS_START(mp, 0, p))) 343 vrele(vp); 344 } else { 345 vp->v_mountedhere = (struct mount *)0; 346 vfs->vfs_refcount--; 347 vfs_unbusy(mp); 348 free((caddr_t)mp, M_MOUNT); 349 vput(vp); 350 } 351 return (error); 352 } 353 354 /* 355 * Scan all active processes to see if any of them have a current 356 * or root directory onto which the new filesystem has just been 357 * mounted. If so, replace them with the new mount point. 358 */ 359 void 360 checkdirs(olddp) 361 struct vnode *olddp; 362 { 363 struct cwdinfo *cwdi; 364 struct vnode *newdp; 365 struct proc *p; 366 367 if (olddp->v_usecount == 1) 368 return; 369 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 370 panic("mount: lost mount"); 371 proclist_lock_read(); 372 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 373 cwdi = p->p_cwdi; 374 if (cwdi->cwdi_cdir == olddp) { 375 vrele(cwdi->cwdi_cdir); 376 VREF(newdp); 377 cwdi->cwdi_cdir = newdp; 378 } 379 if (cwdi->cwdi_rdir == olddp) { 380 vrele(cwdi->cwdi_rdir); 381 VREF(newdp); 382 cwdi->cwdi_rdir = newdp; 383 } 384 } 385 proclist_unlock_read(); 386 if (rootvnode == olddp) { 387 vrele(rootvnode); 388 VREF(newdp); 389 rootvnode = newdp; 390 } 391 vput(newdp); 392 } 393 394 /* 395 * Unmount a file system. 396 * 397 * Note: unmount takes a path to the vnode mounted on as argument, 398 * not special file (as before). 399 */ 400 /* ARGSUSED */ 401 int 402 sys_unmount(p, v, retval) 403 struct proc *p; 404 void *v; 405 register_t *retval; 406 { 407 struct sys_unmount_args /* { 408 syscallarg(const char *) path; 409 syscallarg(int) flags; 410 } */ *uap = v; 411 struct vnode *vp; 412 struct mount *mp; 413 int error; 414 struct nameidata nd; 415 416 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 417 SCARG(uap, path), p); 418 if ((error = namei(&nd)) != 0) 419 return (error); 420 vp = nd.ni_vp; 421 mp = vp->v_mount; 422 423 /* 424 * Only root, or the user that did the original mount is 425 * permitted to unmount this filesystem. 426 */ 427 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 428 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 429 vput(vp); 430 return (error); 431 } 432 433 /* 434 * Don't allow unmounting the root file system. 435 */ 436 if (mp->mnt_flag & MNT_ROOTFS) { 437 vput(vp); 438 return (EINVAL); 439 } 440 441 /* 442 * Must be the root of the filesystem 443 */ 444 if ((vp->v_flag & VROOT) == 0) { 445 vput(vp); 446 return (EINVAL); 447 } 448 vput(vp); 449 450 /* 451 * XXX Freeze syncer. Must do this before locking the 452 * mount point. See dounmount() for details. 453 */ 454 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 455 456 if (vfs_busy(mp, 0, 0)) { 457 lockmgr(&syncer_lock, LK_RELEASE, NULL); 458 return (EBUSY); 459 } 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 struct mount *mp; 471 int flags; 472 struct proc *p; 473 { 474 struct vnode *coveredvp; 475 int error; 476 int async; 477 int used_syncer; 478 479 simple_lock(&mountlist_slock); 480 vfs_unbusy(mp); 481 used_syncer = (mp->mnt_syncer != NULL); 482 483 /* 484 * XXX Syncer must be frozen when we get here. This should really 485 * be done on a per-mountpoint basis, but especially the softdep 486 * code possibly called from the syncer doens't exactly work on a 487 * per-mountpoint basis, so the softdep code would become a maze 488 * of vfs_busy() calls. 489 * 490 * The caller of dounmount() must acquire syncer_lock because 491 * the syncer itself acquires locks in syncer_lock -> vfs_busy 492 * order, and we must preserve that order to avoid deadlock. 493 * 494 * So, if the file system did not use the syncer, now is 495 * the time to release the syncer_lock. 496 */ 497 if (used_syncer == 0) 498 lockmgr(&syncer_lock, LK_RELEASE, NULL); 499 500 mp->mnt_flag |= MNT_UNMOUNT; 501 mp->mnt_unmounter = p; 502 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 503 if (mp->mnt_flag & MNT_EXPUBLIC) 504 vfs_setpublicfs(NULL, NULL, NULL); 505 async = mp->mnt_flag & MNT_ASYNC; 506 mp->mnt_flag &= ~MNT_ASYNC; 507 cache_purgevfs(mp); /* remove cache entries for this file sys */ 508 if (mp->mnt_syncer != NULL) 509 vfs_deallocate_syncvnode(mp); 510 if (((mp->mnt_flag & MNT_RDONLY) || 511 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 512 (flags & MNT_FORCE)) 513 error = VFS_UNMOUNT(mp, flags, p); 514 simple_lock(&mountlist_slock); 515 if (error) { 516 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 517 (void) vfs_allocate_syncvnode(mp); 518 mp->mnt_flag &= ~MNT_UNMOUNT; 519 mp->mnt_unmounter = NULL; 520 mp->mnt_flag |= async; 521 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 522 &mountlist_slock); 523 if (used_syncer) 524 lockmgr(&syncer_lock, LK_RELEASE, NULL); 525 while (mp->mnt_wcnt > 0) { 526 wakeup((caddr_t)mp); 527 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 528 } 529 return (error); 530 } 531 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 532 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 533 coveredvp->v_mountedhere = NULL; 534 vrele(coveredvp); 535 } 536 mp->mnt_op->vfs_refcount--; 537 if (mp->mnt_vnodelist.lh_first != NULL) 538 panic("unmount: dangling vnode"); 539 mp->mnt_flag |= MNT_GONE; 540 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 541 if (used_syncer) 542 lockmgr(&syncer_lock, LK_RELEASE, NULL); 543 while(mp->mnt_wcnt > 0) { 544 wakeup((caddr_t)mp); 545 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 546 } 547 free((caddr_t)mp, M_MOUNT); 548 return (0); 549 } 550 551 /* 552 * Sync each mounted filesystem. 553 */ 554 #ifdef DEBUG 555 int syncprt = 0; 556 struct ctldebug debug0 = { "syncprt", &syncprt }; 557 #endif 558 559 /* ARGSUSED */ 560 int 561 sys_sync(p, v, retval) 562 struct proc *p; 563 void *v; 564 register_t *retval; 565 { 566 struct mount *mp, *nmp; 567 int asyncflag; 568 569 simple_lock(&mountlist_slock); 570 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 571 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 572 nmp = mp->mnt_list.cqe_prev; 573 continue; 574 } 575 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 576 asyncflag = mp->mnt_flag & MNT_ASYNC; 577 mp->mnt_flag &= ~MNT_ASYNC; 578 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 579 if (asyncflag) 580 mp->mnt_flag |= MNT_ASYNC; 581 } 582 simple_lock(&mountlist_slock); 583 nmp = mp->mnt_list.cqe_prev; 584 vfs_unbusy(mp); 585 586 } 587 simple_unlock(&mountlist_slock); 588 #ifdef DEBUG 589 if (syncprt) 590 vfs_bufstats(); 591 #endif /* DEBUG */ 592 return (0); 593 } 594 595 /* 596 * Change filesystem quotas. 597 */ 598 /* ARGSUSED */ 599 int 600 sys_quotactl(p, v, retval) 601 struct proc *p; 602 void *v; 603 register_t *retval; 604 { 605 struct sys_quotactl_args /* { 606 syscallarg(const char *) path; 607 syscallarg(int) cmd; 608 syscallarg(int) uid; 609 syscallarg(caddr_t) arg; 610 } */ *uap = v; 611 struct mount *mp; 612 int error; 613 struct nameidata nd; 614 615 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 616 if ((error = namei(&nd)) != 0) 617 return (error); 618 mp = nd.ni_vp->v_mount; 619 vrele(nd.ni_vp); 620 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 621 SCARG(uap, arg), p)); 622 } 623 624 /* 625 * Get filesystem statistics. 626 */ 627 /* ARGSUSED */ 628 int 629 sys_statfs(p, v, retval) 630 struct proc *p; 631 void *v; 632 register_t *retval; 633 { 634 struct sys_statfs_args /* { 635 syscallarg(const char *) path; 636 syscallarg(struct statfs *) buf; 637 } */ *uap = v; 638 struct mount *mp; 639 struct statfs *sp; 640 int error; 641 struct nameidata nd; 642 643 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 644 if ((error = namei(&nd)) != 0) 645 return (error); 646 mp = nd.ni_vp->v_mount; 647 sp = &mp->mnt_stat; 648 vrele(nd.ni_vp); 649 if ((error = VFS_STATFS(mp, sp, p)) != 0) 650 return (error); 651 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 652 sp->f_oflags = sp->f_flags & 0xffff; 653 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 654 } 655 656 /* 657 * Get filesystem statistics. 658 */ 659 /* ARGSUSED */ 660 int 661 sys_fstatfs(p, v, retval) 662 struct proc *p; 663 void *v; 664 register_t *retval; 665 { 666 struct sys_fstatfs_args /* { 667 syscallarg(int) fd; 668 syscallarg(struct statfs *) buf; 669 } */ *uap = v; 670 struct file *fp; 671 struct mount *mp; 672 struct statfs *sp; 673 int error; 674 675 /* getvnode() will use the descriptor for us */ 676 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 677 return (error); 678 mp = ((struct vnode *)fp->f_data)->v_mount; 679 sp = &mp->mnt_stat; 680 if ((error = VFS_STATFS(mp, sp, p)) != 0) 681 goto out; 682 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 683 sp->f_oflags = sp->f_flags & 0xffff; 684 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 685 out: 686 FILE_UNUSE(fp, p); 687 return (error); 688 } 689 690 /* 691 * Get statistics on all filesystems. 692 */ 693 int 694 sys_getfsstat(p, v, retval) 695 struct proc *p; 696 void *v; 697 register_t *retval; 698 { 699 struct sys_getfsstat_args /* { 700 syscallarg(struct statfs *) buf; 701 syscallarg(long) bufsize; 702 syscallarg(int) flags; 703 } */ *uap = v; 704 struct mount *mp, *nmp; 705 struct statfs *sp; 706 caddr_t sfsp; 707 long count, maxcount, error; 708 709 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 710 sfsp = (caddr_t)SCARG(uap, buf); 711 simple_lock(&mountlist_slock); 712 count = 0; 713 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 714 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 715 nmp = mp->mnt_list.cqe_next; 716 continue; 717 } 718 if (sfsp && count < maxcount) { 719 sp = &mp->mnt_stat; 720 /* 721 * If MNT_NOWAIT or MNT_LAZY is specified, do not 722 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 723 * overrides MNT_NOWAIT. 724 */ 725 if (SCARG(uap, flags) != MNT_NOWAIT && 726 SCARG(uap, flags) != MNT_LAZY && 727 (SCARG(uap, flags) == MNT_WAIT || 728 SCARG(uap, flags) == 0) && 729 (error = VFS_STATFS(mp, sp, p)) != 0) { 730 simple_lock(&mountlist_slock); 731 nmp = mp->mnt_list.cqe_next; 732 vfs_unbusy(mp); 733 continue; 734 } 735 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 736 sp->f_oflags = sp->f_flags & 0xffff; 737 error = copyout(sp, sfsp, sizeof(*sp)); 738 if (error) { 739 vfs_unbusy(mp); 740 return (error); 741 } 742 sfsp += sizeof(*sp); 743 } 744 count++; 745 simple_lock(&mountlist_slock); 746 nmp = mp->mnt_list.cqe_next; 747 vfs_unbusy(mp); 748 } 749 simple_unlock(&mountlist_slock); 750 if (sfsp && count > maxcount) 751 *retval = maxcount; 752 else 753 *retval = count; 754 return (0); 755 } 756 757 /* 758 * Change current working directory to a given file descriptor. 759 */ 760 /* ARGSUSED */ 761 int 762 sys_fchdir(p, v, retval) 763 struct proc *p; 764 void *v; 765 register_t *retval; 766 { 767 struct sys_fchdir_args /* { 768 syscallarg(int) fd; 769 } */ *uap = v; 770 struct filedesc *fdp = p->p_fd; 771 struct cwdinfo *cwdi = p->p_cwdi; 772 struct vnode *vp, *tdp; 773 struct mount *mp; 774 struct file *fp; 775 int error; 776 777 /* getvnode() will use the descriptor for us */ 778 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 779 return (error); 780 vp = (struct vnode *)fp->f_data; 781 782 VREF(vp); 783 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 784 if (vp->v_type != VDIR) 785 error = ENOTDIR; 786 else 787 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 788 while (!error && (mp = vp->v_mountedhere) != NULL) { 789 if (vfs_busy(mp, 0, 0)) 790 continue; 791 error = VFS_ROOT(mp, &tdp); 792 vfs_unbusy(mp); 793 if (error) 794 break; 795 vput(vp); 796 vp = tdp; 797 } 798 if (error) { 799 vput(vp); 800 goto out; 801 } 802 VOP_UNLOCK(vp, 0); 803 804 /* 805 * Disallow changing to a directory not under the process's 806 * current root directory (if there is one). 807 */ 808 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 809 vrele(vp); 810 error = EPERM; /* operation not permitted */ 811 goto out; 812 } 813 814 vrele(cwdi->cwdi_cdir); 815 cwdi->cwdi_cdir = vp; 816 out: 817 FILE_UNUSE(fp, p); 818 return (error); 819 } 820 821 /* 822 * Change this process's notion of the root directory to a given file descriptor. 823 */ 824 825 int 826 sys_fchroot(p, v, retval) 827 struct proc *p; 828 void *v; 829 register_t *retval; 830 { 831 struct sys_fchroot_args *uap = v; 832 struct filedesc *fdp = p->p_fd; 833 struct cwdinfo *cwdi = p->p_cwdi; 834 struct vnode *vp; 835 struct file *fp; 836 int error; 837 838 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 839 return error; 840 /* getvnode() will use the descriptor for us */ 841 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 842 return error; 843 vp = (struct vnode *) fp->f_data; 844 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 845 if (vp->v_type != VDIR) 846 error = ENOTDIR; 847 else 848 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 849 VOP_UNLOCK(vp, 0); 850 if (error) 851 goto out; 852 VREF(vp); 853 854 /* 855 * Prevent escaping from chroot by putting the root under 856 * the working directory. Silently chdir to / if we aren't 857 * already there. 858 */ 859 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 860 /* 861 * XXX would be more failsafe to change directory to a 862 * deadfs node here instead 863 */ 864 vrele(cwdi->cwdi_cdir); 865 VREF(vp); 866 cwdi->cwdi_cdir = vp; 867 } 868 869 if (cwdi->cwdi_rdir != NULL) 870 vrele(cwdi->cwdi_rdir); 871 cwdi->cwdi_rdir = vp; 872 out: 873 FILE_UNUSE(fp, p); 874 return (error); 875 } 876 877 878 879 /* 880 * Change current working directory (``.''). 881 */ 882 /* ARGSUSED */ 883 int 884 sys_chdir(p, v, retval) 885 struct proc *p; 886 void *v; 887 register_t *retval; 888 { 889 struct sys_chdir_args /* { 890 syscallarg(const char *) path; 891 } */ *uap = v; 892 struct cwdinfo *cwdi = p->p_cwdi; 893 int error; 894 struct nameidata nd; 895 896 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 897 SCARG(uap, path), p); 898 if ((error = change_dir(&nd, p)) != 0) 899 return (error); 900 vrele(cwdi->cwdi_cdir); 901 cwdi->cwdi_cdir = nd.ni_vp; 902 return (0); 903 } 904 905 /* 906 * Change notion of root (``/'') directory. 907 */ 908 /* ARGSUSED */ 909 int 910 sys_chroot(p, v, retval) 911 struct proc *p; 912 void *v; 913 register_t *retval; 914 { 915 struct sys_chroot_args /* { 916 syscallarg(const char *) path; 917 } */ *uap = v; 918 struct cwdinfo *cwdi = p->p_cwdi; 919 struct vnode *vp; 920 int error; 921 struct nameidata nd; 922 923 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 924 return (error); 925 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 926 SCARG(uap, path), p); 927 if ((error = change_dir(&nd, p)) != 0) 928 return (error); 929 if (cwdi->cwdi_rdir != NULL) 930 vrele(cwdi->cwdi_rdir); 931 vp = nd.ni_vp; 932 cwdi->cwdi_rdir = vp; 933 934 /* 935 * Prevent escaping from chroot by putting the root under 936 * the working directory. Silently chdir to / if we aren't 937 * already there. 938 */ 939 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 940 /* 941 * XXX would be more failsafe to change directory to a 942 * deadfs node here instead 943 */ 944 vrele(cwdi->cwdi_cdir); 945 VREF(vp); 946 cwdi->cwdi_cdir = vp; 947 } 948 949 return (0); 950 } 951 952 /* 953 * Common routine for chroot and chdir. 954 */ 955 static int 956 change_dir(ndp, p) 957 struct nameidata *ndp; 958 struct proc *p; 959 { 960 struct vnode *vp; 961 int error; 962 963 if ((error = namei(ndp)) != 0) 964 return (error); 965 vp = ndp->ni_vp; 966 if (vp->v_type != VDIR) 967 error = ENOTDIR; 968 else 969 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 970 971 if (error) 972 vput(vp); 973 else 974 VOP_UNLOCK(vp, 0); 975 return (error); 976 } 977 978 /* 979 * Check permissions, allocate an open file structure, 980 * and call the device open routine if any. 981 */ 982 int 983 sys_open(p, v, retval) 984 struct proc *p; 985 void *v; 986 register_t *retval; 987 { 988 struct sys_open_args /* { 989 syscallarg(const char *) path; 990 syscallarg(int) flags; 991 syscallarg(int) mode; 992 } */ *uap = v; 993 struct cwdinfo *cwdi = p->p_cwdi; 994 struct filedesc *fdp = p->p_fd; 995 struct file *fp; 996 struct vnode *vp; 997 int flags, cmode; 998 int type, indx, error; 999 struct flock lf; 1000 struct nameidata nd; 1001 1002 flags = FFLAGS(SCARG(uap, flags)); 1003 if ((flags & (FREAD | FWRITE)) == 0) 1004 return (EINVAL); 1005 /* falloc() will use the file descriptor for us */ 1006 if ((error = falloc(p, &fp, &indx)) != 0) 1007 return (error); 1008 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1009 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1010 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1011 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1012 FILE_UNUSE(fp, p); 1013 ffree(fp); 1014 if ((error == ENODEV || error == ENXIO) && 1015 p->p_dupfd >= 0 && /* XXX from fdopen */ 1016 (error = 1017 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1018 *retval = indx; 1019 return (0); 1020 } 1021 if (error == ERESTART) 1022 error = EINTR; 1023 fdremove(fdp, indx); 1024 return (error); 1025 } 1026 p->p_dupfd = 0; 1027 vp = nd.ni_vp; 1028 fp->f_flag = flags & FMASK; 1029 fp->f_type = DTYPE_VNODE; 1030 fp->f_ops = &vnops; 1031 fp->f_data = (caddr_t)vp; 1032 if (flags & (O_EXLOCK | O_SHLOCK)) { 1033 lf.l_whence = SEEK_SET; 1034 lf.l_start = 0; 1035 lf.l_len = 0; 1036 if (flags & O_EXLOCK) 1037 lf.l_type = F_WRLCK; 1038 else 1039 lf.l_type = F_RDLCK; 1040 type = F_FLOCK; 1041 if ((flags & FNONBLOCK) == 0) 1042 type |= F_WAIT; 1043 VOP_UNLOCK(vp, 0); 1044 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1045 if (error) { 1046 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1047 FILE_UNUSE(fp, p); 1048 ffree(fp); 1049 fdremove(fdp, indx); 1050 return (error); 1051 } 1052 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1053 fp->f_flag |= FHASLOCK; 1054 } 1055 VOP_UNLOCK(vp, 0); 1056 *retval = indx; 1057 FILE_SET_MATURE(fp); 1058 FILE_UNUSE(fp, p); 1059 return (0); 1060 } 1061 1062 /* 1063 * Get file handle system call 1064 */ 1065 int 1066 sys_getfh(p, v, retval) 1067 struct proc *p; 1068 void *v; 1069 register_t *retval; 1070 { 1071 struct sys_getfh_args /* { 1072 syscallarg(char *) fname; 1073 syscallarg(fhandle_t *) fhp; 1074 } */ *uap = v; 1075 struct vnode *vp; 1076 fhandle_t fh; 1077 int error; 1078 struct nameidata nd; 1079 1080 /* 1081 * Must be super user 1082 */ 1083 error = suser(p->p_ucred, &p->p_acflag); 1084 if (error) 1085 return (error); 1086 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1087 SCARG(uap, fname), p); 1088 error = namei(&nd); 1089 if (error) 1090 return (error); 1091 vp = nd.ni_vp; 1092 memset((caddr_t)&fh, 0, sizeof(fh)); 1093 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1094 error = VFS_VPTOFH(vp, &fh.fh_fid); 1095 vput(vp); 1096 if (error) 1097 return (error); 1098 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1099 return (error); 1100 } 1101 1102 /* 1103 * Open a file given a file handle. 1104 * 1105 * Check permissions, allocate an open file structure, 1106 * and call the device open routine if any. 1107 */ 1108 int 1109 sys_fhopen(p, v, retval) 1110 struct proc *p; 1111 void *v; 1112 register_t *retval; 1113 { 1114 struct sys_fhopen_args /* { 1115 syscallarg(const fhandle_t *) fhp; 1116 syscallarg(int) flags; 1117 } */ *uap = v; 1118 struct filedesc *fdp = p->p_fd; 1119 struct file *fp; 1120 struct vnode *vp = NULL; 1121 struct mount *mp; 1122 struct ucred *cred = p->p_ucred; 1123 int flags; 1124 struct file *nfp; 1125 int type, indx, error=0; 1126 struct flock lf; 1127 struct vattr va; 1128 fhandle_t fh; 1129 1130 /* 1131 * Must be super user 1132 */ 1133 if ((error = suser(p->p_ucred, &p->p_acflag))) 1134 return (error); 1135 1136 flags = FFLAGS(SCARG(uap, flags)); 1137 if ((flags & (FREAD | FWRITE)) == 0) 1138 return (EINVAL); 1139 if ((flags & O_CREAT)) 1140 return (EINVAL); 1141 /* falloc() will use the file descriptor for us */ 1142 if ((error = falloc(p, &nfp, &indx)) != 0) 1143 return (error); 1144 fp = nfp; 1145 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1146 goto bad; 1147 1148 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1149 error = ESTALE; 1150 goto bad; 1151 } 1152 1153 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1154 vp = NULL; /* most likely unnecessary sanity for bad: */ 1155 goto bad; 1156 } 1157 1158 /* Now do an effective vn_open */ 1159 1160 if (vp->v_type == VSOCK) { 1161 error = EOPNOTSUPP; 1162 goto bad; 1163 } 1164 if (flags & FREAD) { 1165 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1166 goto bad; 1167 } 1168 if (flags & (FWRITE | O_TRUNC)) { 1169 if (vp->v_type == VDIR) { 1170 error = EISDIR; 1171 goto bad; 1172 } 1173 if ((error = vn_writechk(vp)) != 0 || 1174 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1175 goto bad; 1176 } 1177 if (flags & O_TRUNC) { 1178 VOP_UNLOCK(vp, 0); /* XXX */ 1179 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1180 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1181 VATTR_NULL(&va); 1182 va.va_size = 0; 1183 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1184 goto bad; 1185 } 1186 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1187 goto bad; 1188 if (vp->v_type == VREG && 1189 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1190 error = EIO; 1191 goto bad; 1192 } 1193 if (flags & FWRITE) 1194 vp->v_writecount++; 1195 1196 /* done with modified vn_open, now finish what sys_open does. */ 1197 1198 fp->f_flag = flags & FMASK; 1199 fp->f_type = DTYPE_VNODE; 1200 fp->f_ops = &vnops; 1201 fp->f_data = (caddr_t)vp; 1202 if (flags & (O_EXLOCK | O_SHLOCK)) { 1203 lf.l_whence = SEEK_SET; 1204 lf.l_start = 0; 1205 lf.l_len = 0; 1206 if (flags & O_EXLOCK) 1207 lf.l_type = F_WRLCK; 1208 else 1209 lf.l_type = F_RDLCK; 1210 type = F_FLOCK; 1211 if ((flags & FNONBLOCK) == 0) 1212 type |= F_WAIT; 1213 VOP_UNLOCK(vp, 0); 1214 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1215 if (error) { 1216 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1217 FILE_UNUSE(fp, p); 1218 ffree(fp); 1219 fdremove(fdp, indx); 1220 return (error); 1221 } 1222 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1223 fp->f_flag |= FHASLOCK; 1224 } 1225 VOP_UNLOCK(vp, 0); 1226 *retval = indx; 1227 FILE_SET_MATURE(fp); 1228 FILE_UNUSE(fp, p); 1229 return (0); 1230 1231 bad: 1232 FILE_UNUSE(fp, p); 1233 ffree(fp); 1234 fdremove(fdp, indx); 1235 if (vp != NULL) 1236 vput(vp); 1237 return (error); 1238 } 1239 1240 /* ARGSUSED */ 1241 int 1242 sys_fhstat(p, v, retval) 1243 struct proc *p; 1244 void *v; 1245 register_t *retval; 1246 { 1247 struct sys_fhstat_args /* { 1248 syscallarg(const fhandle_t *) fhp; 1249 syscallarg(struct stat *) sb; 1250 } */ *uap = v; 1251 struct stat sb; 1252 int error; 1253 fhandle_t fh; 1254 struct mount *mp; 1255 struct vnode *vp; 1256 1257 /* 1258 * Must be super user 1259 */ 1260 if ((error = suser(p->p_ucred, &p->p_acflag))) 1261 return (error); 1262 1263 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1264 return (error); 1265 1266 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1267 return (ESTALE); 1268 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1269 return (error); 1270 error = vn_stat(vp, &sb, p); 1271 vput(vp); 1272 if (error) 1273 return (error); 1274 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1275 return (error); 1276 } 1277 1278 /* ARGSUSED */ 1279 int 1280 sys_fhstatfs(p, v, retval) 1281 struct proc *p; 1282 void *v; 1283 register_t *retval; 1284 { 1285 struct sys_fhstatfs_args /* 1286 syscallarg(const fhandle_t *) fhp; 1287 syscallarg(struct statfs *) buf; 1288 } */ *uap = v; 1289 struct statfs sp; 1290 fhandle_t fh; 1291 struct mount *mp; 1292 struct vnode *vp; 1293 int error; 1294 1295 /* 1296 * Must be super user 1297 */ 1298 if ((error = suser(p->p_ucred, &p->p_acflag))) 1299 return (error); 1300 1301 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1302 return (error); 1303 1304 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1305 return (ESTALE); 1306 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1307 return (error); 1308 mp = vp->v_mount; 1309 vput(vp); 1310 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1311 return (error); 1312 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1313 sp.f_oflags = sp.f_flags & 0xffff; 1314 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1315 } 1316 1317 /* 1318 * Create a special file. 1319 */ 1320 /* ARGSUSED */ 1321 int 1322 sys_mknod(p, v, retval) 1323 struct proc *p; 1324 void *v; 1325 register_t *retval; 1326 { 1327 struct sys_mknod_args /* { 1328 syscallarg(const char *) path; 1329 syscallarg(int) mode; 1330 syscallarg(int) dev; 1331 } */ *uap = v; 1332 struct vnode *vp; 1333 struct vattr vattr; 1334 int error; 1335 int whiteout = 0; 1336 struct nameidata nd; 1337 1338 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1339 return (error); 1340 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1341 if ((error = namei(&nd)) != 0) 1342 return (error); 1343 vp = nd.ni_vp; 1344 if (vp != NULL) 1345 error = EEXIST; 1346 else { 1347 VATTR_NULL(&vattr); 1348 vattr.va_mode = 1349 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1350 vattr.va_rdev = SCARG(uap, dev); 1351 whiteout = 0; 1352 1353 switch (SCARG(uap, mode) & S_IFMT) { 1354 case S_IFMT: /* used by badsect to flag bad sectors */ 1355 vattr.va_type = VBAD; 1356 break; 1357 case S_IFCHR: 1358 vattr.va_type = VCHR; 1359 break; 1360 case S_IFBLK: 1361 vattr.va_type = VBLK; 1362 break; 1363 case S_IFWHT: 1364 whiteout = 1; 1365 break; 1366 default: 1367 error = EINVAL; 1368 break; 1369 } 1370 } 1371 if (!error) { 1372 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1373 if (whiteout) { 1374 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1375 if (error) 1376 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1377 vput(nd.ni_dvp); 1378 } else { 1379 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1380 &nd.ni_cnd, &vattr); 1381 if (error == 0) 1382 vput(nd.ni_vp); 1383 } 1384 } else { 1385 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1386 if (nd.ni_dvp == vp) 1387 vrele(nd.ni_dvp); 1388 else 1389 vput(nd.ni_dvp); 1390 if (vp) 1391 vrele(vp); 1392 } 1393 return (error); 1394 } 1395 1396 /* 1397 * Create a named pipe. 1398 */ 1399 /* ARGSUSED */ 1400 int 1401 sys_mkfifo(p, v, retval) 1402 struct proc *p; 1403 void *v; 1404 register_t *retval; 1405 { 1406 struct sys_mkfifo_args /* { 1407 syscallarg(const char *) path; 1408 syscallarg(int) mode; 1409 } */ *uap = v; 1410 struct vattr vattr; 1411 int error; 1412 struct nameidata nd; 1413 1414 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1415 if ((error = namei(&nd)) != 0) 1416 return (error); 1417 if (nd.ni_vp != NULL) { 1418 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1419 if (nd.ni_dvp == nd.ni_vp) 1420 vrele(nd.ni_dvp); 1421 else 1422 vput(nd.ni_dvp); 1423 vrele(nd.ni_vp); 1424 return (EEXIST); 1425 } 1426 VATTR_NULL(&vattr); 1427 vattr.va_type = VFIFO; 1428 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1429 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1430 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1431 if (error == 0) 1432 vput(nd.ni_vp); 1433 return (error); 1434 } 1435 1436 /* 1437 * Make a hard file link. 1438 */ 1439 /* ARGSUSED */ 1440 int 1441 sys_link(p, v, retval) 1442 struct proc *p; 1443 void *v; 1444 register_t *retval; 1445 { 1446 struct sys_link_args /* { 1447 syscallarg(const char *) path; 1448 syscallarg(const char *) link; 1449 } */ *uap = v; 1450 struct vnode *vp; 1451 struct nameidata nd; 1452 int error; 1453 1454 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1455 if ((error = namei(&nd)) != 0) 1456 return (error); 1457 vp = nd.ni_vp; 1458 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1459 if ((error = namei(&nd)) != 0) 1460 goto out; 1461 if (nd.ni_vp) { 1462 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1463 if (nd.ni_dvp == nd.ni_vp) 1464 vrele(nd.ni_dvp); 1465 else 1466 vput(nd.ni_dvp); 1467 vrele(nd.ni_vp); 1468 error = EEXIST; 1469 goto out; 1470 } 1471 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1472 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1473 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1474 out: 1475 vrele(vp); 1476 return (error); 1477 } 1478 1479 /* 1480 * Make a symbolic link. 1481 */ 1482 /* ARGSUSED */ 1483 int 1484 sys_symlink(p, v, retval) 1485 struct proc *p; 1486 void *v; 1487 register_t *retval; 1488 { 1489 struct sys_symlink_args /* { 1490 syscallarg(const char *) path; 1491 syscallarg(const char *) link; 1492 } */ *uap = v; 1493 struct vattr vattr; 1494 char *path; 1495 int error; 1496 struct nameidata nd; 1497 1498 path = PNBUF_GET(); 1499 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1500 if (error) 1501 goto out; 1502 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1503 if ((error = namei(&nd)) != 0) 1504 goto out; 1505 if (nd.ni_vp) { 1506 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1507 if (nd.ni_dvp == nd.ni_vp) 1508 vrele(nd.ni_dvp); 1509 else 1510 vput(nd.ni_dvp); 1511 vrele(nd.ni_vp); 1512 error = EEXIST; 1513 goto out; 1514 } 1515 VATTR_NULL(&vattr); 1516 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1517 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1518 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1519 if (error == 0) 1520 vput(nd.ni_vp); 1521 out: 1522 PNBUF_PUT(path); 1523 return (error); 1524 } 1525 1526 /* 1527 * Delete a whiteout from the filesystem. 1528 */ 1529 /* ARGSUSED */ 1530 int 1531 sys_undelete(p, v, retval) 1532 struct proc *p; 1533 void *v; 1534 register_t *retval; 1535 { 1536 struct sys_undelete_args /* { 1537 syscallarg(const char *) path; 1538 } */ *uap = v; 1539 int error; 1540 struct nameidata nd; 1541 1542 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1543 SCARG(uap, path), p); 1544 error = namei(&nd); 1545 if (error) 1546 return (error); 1547 1548 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1549 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1550 if (nd.ni_dvp == nd.ni_vp) 1551 vrele(nd.ni_dvp); 1552 else 1553 vput(nd.ni_dvp); 1554 if (nd.ni_vp) 1555 vrele(nd.ni_vp); 1556 return (EEXIST); 1557 } 1558 1559 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1560 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1561 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1562 vput(nd.ni_dvp); 1563 return (error); 1564 } 1565 1566 /* 1567 * Delete a name from the filesystem. 1568 */ 1569 /* ARGSUSED */ 1570 int 1571 sys_unlink(p, v, retval) 1572 struct proc *p; 1573 void *v; 1574 register_t *retval; 1575 { 1576 struct sys_unlink_args /* { 1577 syscallarg(const char *) path; 1578 } */ *uap = v; 1579 struct vnode *vp; 1580 int error; 1581 struct nameidata nd; 1582 1583 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1584 SCARG(uap, path), p); 1585 if ((error = namei(&nd)) != 0) 1586 return (error); 1587 vp = nd.ni_vp; 1588 1589 /* 1590 * The root of a mounted filesystem cannot be deleted. 1591 */ 1592 if (vp->v_flag & VROOT) { 1593 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1594 if (nd.ni_dvp == vp) 1595 vrele(nd.ni_dvp); 1596 else 1597 vput(nd.ni_dvp); 1598 vput(vp); 1599 error = EBUSY; 1600 goto out; 1601 } 1602 1603 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1604 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1605 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1606 out: 1607 return (error); 1608 } 1609 1610 /* 1611 * Reposition read/write file offset. 1612 */ 1613 int 1614 sys_lseek(p, v, retval) 1615 struct proc *p; 1616 void *v; 1617 register_t *retval; 1618 { 1619 struct sys_lseek_args /* { 1620 syscallarg(int) fd; 1621 syscallarg(int) pad; 1622 syscallarg(off_t) offset; 1623 syscallarg(int) whence; 1624 } */ *uap = v; 1625 struct ucred *cred = p->p_ucred; 1626 struct filedesc *fdp = p->p_fd; 1627 struct file *fp; 1628 struct vnode *vp; 1629 struct vattr vattr; 1630 off_t newoff; 1631 int error; 1632 1633 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1634 return (EBADF); 1635 1636 FILE_USE(fp); 1637 1638 vp = (struct vnode *)fp->f_data; 1639 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1640 error = ESPIPE; 1641 goto out; 1642 } 1643 1644 switch (SCARG(uap, whence)) { 1645 case SEEK_CUR: 1646 newoff = fp->f_offset + SCARG(uap, offset); 1647 break; 1648 case SEEK_END: 1649 error = VOP_GETATTR(vp, &vattr, cred, p); 1650 if (error) 1651 goto out; 1652 newoff = SCARG(uap, offset) + vattr.va_size; 1653 break; 1654 case SEEK_SET: 1655 newoff = SCARG(uap, offset); 1656 break; 1657 default: 1658 error = EINVAL; 1659 goto out; 1660 } 1661 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1662 goto out; 1663 1664 *(off_t *)retval = fp->f_offset = newoff; 1665 out: 1666 FILE_UNUSE(fp, p); 1667 return (error); 1668 } 1669 1670 /* 1671 * Positional read system call. 1672 */ 1673 int 1674 sys_pread(p, v, retval) 1675 struct proc *p; 1676 void *v; 1677 register_t *retval; 1678 { 1679 struct sys_pread_args /* { 1680 syscallarg(int) fd; 1681 syscallarg(void *) buf; 1682 syscallarg(size_t) nbyte; 1683 syscallarg(off_t) offset; 1684 } */ *uap = v; 1685 struct filedesc *fdp = p->p_fd; 1686 struct file *fp; 1687 struct vnode *vp; 1688 off_t offset; 1689 int error, fd = SCARG(uap, fd); 1690 1691 if ((fp = fd_getfile(fdp, fd)) == NULL) 1692 return (EBADF); 1693 1694 if ((fp->f_flag & FREAD) == 0) 1695 return (EBADF); 1696 1697 FILE_USE(fp); 1698 1699 vp = (struct vnode *)fp->f_data; 1700 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1701 error = ESPIPE; 1702 goto out; 1703 } 1704 1705 offset = SCARG(uap, offset); 1706 1707 /* 1708 * XXX This works because no file systems actually 1709 * XXX take any action on the seek operation. 1710 */ 1711 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1712 goto out; 1713 1714 /* dofileread() will unuse the descriptor for us */ 1715 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1716 &offset, 0, retval)); 1717 1718 out: 1719 FILE_UNUSE(fp, p); 1720 return (error); 1721 } 1722 1723 /* 1724 * Positional scatter read system call. 1725 */ 1726 int 1727 sys_preadv(p, v, retval) 1728 struct proc *p; 1729 void *v; 1730 register_t *retval; 1731 { 1732 struct sys_preadv_args /* { 1733 syscallarg(int) fd; 1734 syscallarg(const struct iovec *) iovp; 1735 syscallarg(int) iovcnt; 1736 syscallarg(off_t) offset; 1737 } */ *uap = v; 1738 struct filedesc *fdp = p->p_fd; 1739 struct file *fp; 1740 struct vnode *vp; 1741 off_t offset; 1742 int error, fd = SCARG(uap, fd); 1743 1744 if ((fp = fd_getfile(fdp, fd)) == NULL) 1745 return (EBADF); 1746 1747 if ((fp->f_flag & FREAD) == 0) 1748 return (EBADF); 1749 1750 FILE_USE(fp); 1751 1752 vp = (struct vnode *)fp->f_data; 1753 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1754 error = ESPIPE; 1755 goto out; 1756 } 1757 1758 offset = SCARG(uap, offset); 1759 1760 /* 1761 * XXX This works because no file systems actually 1762 * XXX take any action on the seek operation. 1763 */ 1764 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1765 goto out; 1766 1767 /* dofilereadv() will unuse the descriptor for us */ 1768 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1769 &offset, 0, retval)); 1770 1771 out: 1772 FILE_UNUSE(fp, p); 1773 return (error); 1774 } 1775 1776 /* 1777 * Positional write system call. 1778 */ 1779 int 1780 sys_pwrite(p, v, retval) 1781 struct proc *p; 1782 void *v; 1783 register_t *retval; 1784 { 1785 struct sys_pwrite_args /* { 1786 syscallarg(int) fd; 1787 syscallarg(const void *) buf; 1788 syscallarg(size_t) nbyte; 1789 syscallarg(off_t) offset; 1790 } */ *uap = v; 1791 struct filedesc *fdp = p->p_fd; 1792 struct file *fp; 1793 struct vnode *vp; 1794 off_t offset; 1795 int error, fd = SCARG(uap, fd); 1796 1797 if ((fp = fd_getfile(fdp, fd)) == NULL) 1798 return (EBADF); 1799 1800 if ((fp->f_flag & FWRITE) == 0) 1801 return (EBADF); 1802 1803 FILE_USE(fp); 1804 1805 vp = (struct vnode *)fp->f_data; 1806 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1807 error = ESPIPE; 1808 goto out; 1809 } 1810 1811 offset = SCARG(uap, offset); 1812 1813 /* 1814 * XXX This works because no file systems actually 1815 * XXX take any action on the seek operation. 1816 */ 1817 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1818 goto out; 1819 1820 /* dofilewrite() will unuse the descriptor for us */ 1821 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1822 &offset, 0, retval)); 1823 1824 out: 1825 FILE_UNUSE(fp, p); 1826 return (error); 1827 } 1828 1829 /* 1830 * Positional gather write system call. 1831 */ 1832 int 1833 sys_pwritev(p, v, retval) 1834 struct proc *p; 1835 void *v; 1836 register_t *retval; 1837 { 1838 struct sys_pwritev_args /* { 1839 syscallarg(int) fd; 1840 syscallarg(const struct iovec *) iovp; 1841 syscallarg(int) iovcnt; 1842 syscallarg(off_t) offset; 1843 } */ *uap = v; 1844 struct filedesc *fdp = p->p_fd; 1845 struct file *fp; 1846 struct vnode *vp; 1847 off_t offset; 1848 int error, fd = SCARG(uap, fd); 1849 1850 if ((fp = fd_getfile(fdp, fd)) == NULL) 1851 return (EBADF); 1852 1853 if ((fp->f_flag & FWRITE) == 0) 1854 return (EBADF); 1855 1856 FILE_USE(fp); 1857 1858 vp = (struct vnode *)fp->f_data; 1859 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1860 error = ESPIPE; 1861 goto out; 1862 } 1863 1864 offset = SCARG(uap, offset); 1865 1866 /* 1867 * XXX This works because no file systems actually 1868 * XXX take any action on the seek operation. 1869 */ 1870 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1871 goto out; 1872 1873 /* dofilewritev() will unuse the descriptor for us */ 1874 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1875 &offset, 0, retval)); 1876 1877 out: 1878 FILE_UNUSE(fp, p); 1879 return (error); 1880 } 1881 1882 /* 1883 * Check access permissions. 1884 */ 1885 int 1886 sys_access(p, v, retval) 1887 struct proc *p; 1888 void *v; 1889 register_t *retval; 1890 { 1891 struct sys_access_args /* { 1892 syscallarg(const char *) path; 1893 syscallarg(int) flags; 1894 } */ *uap = v; 1895 struct ucred *cred = crget(); 1896 struct vnode *vp; 1897 int error, flags; 1898 struct nameidata nd; 1899 1900 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 1901 cred->cr_ref = 1; 1902 cred->cr_uid = p->p_cred->p_ruid; 1903 cred->cr_gid = p->p_cred->p_rgid; 1904 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1905 SCARG(uap, path), p); 1906 /* Override default credentials */ 1907 nd.ni_cnd.cn_cred = cred; 1908 if ((error = namei(&nd)) != 0) 1909 goto out; 1910 vp = nd.ni_vp; 1911 1912 /* Flags == 0 means only check for existence. */ 1913 if (SCARG(uap, flags)) { 1914 flags = 0; 1915 if (SCARG(uap, flags) & R_OK) 1916 flags |= VREAD; 1917 if (SCARG(uap, flags) & W_OK) 1918 flags |= VWRITE; 1919 if (SCARG(uap, flags) & X_OK) 1920 flags |= VEXEC; 1921 1922 error = VOP_ACCESS(vp, flags, cred, p); 1923 if (!error && (flags & VWRITE)) 1924 error = vn_writechk(vp); 1925 } 1926 vput(vp); 1927 out: 1928 crfree(cred); 1929 return (error); 1930 } 1931 1932 /* 1933 * Get file status; this version follows links. 1934 */ 1935 /* ARGSUSED */ 1936 int 1937 sys___stat13(p, v, retval) 1938 struct proc *p; 1939 void *v; 1940 register_t *retval; 1941 { 1942 struct sys___stat13_args /* { 1943 syscallarg(const char *) path; 1944 syscallarg(struct stat *) ub; 1945 } */ *uap = v; 1946 struct stat sb; 1947 int error; 1948 struct nameidata nd; 1949 1950 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1951 SCARG(uap, path), p); 1952 if ((error = namei(&nd)) != 0) 1953 return (error); 1954 error = vn_stat(nd.ni_vp, &sb, p); 1955 vput(nd.ni_vp); 1956 if (error) 1957 return (error); 1958 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1959 return (error); 1960 } 1961 1962 /* 1963 * Get file status; this version does not follow links. 1964 */ 1965 /* ARGSUSED */ 1966 int 1967 sys___lstat13(p, v, retval) 1968 struct proc *p; 1969 void *v; 1970 register_t *retval; 1971 { 1972 struct sys___lstat13_args /* { 1973 syscallarg(const char *) path; 1974 syscallarg(struct stat *) ub; 1975 } */ *uap = v; 1976 struct stat sb; 1977 int error; 1978 struct nameidata nd; 1979 1980 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1981 SCARG(uap, path), p); 1982 if ((error = namei(&nd)) != 0) 1983 return (error); 1984 error = vn_stat(nd.ni_vp, &sb, p); 1985 vput(nd.ni_vp); 1986 if (error) 1987 return (error); 1988 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1989 return (error); 1990 } 1991 1992 /* 1993 * Get configurable pathname variables. 1994 */ 1995 /* ARGSUSED */ 1996 int 1997 sys_pathconf(p, v, retval) 1998 struct proc *p; 1999 void *v; 2000 register_t *retval; 2001 { 2002 struct sys_pathconf_args /* { 2003 syscallarg(const char *) path; 2004 syscallarg(int) name; 2005 } */ *uap = v; 2006 int error; 2007 struct nameidata nd; 2008 2009 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2010 SCARG(uap, path), p); 2011 if ((error = namei(&nd)) != 0) 2012 return (error); 2013 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2014 vput(nd.ni_vp); 2015 return (error); 2016 } 2017 2018 /* 2019 * Return target name of a symbolic link. 2020 */ 2021 /* ARGSUSED */ 2022 int 2023 sys_readlink(p, v, retval) 2024 struct proc *p; 2025 void *v; 2026 register_t *retval; 2027 { 2028 struct sys_readlink_args /* { 2029 syscallarg(const char *) path; 2030 syscallarg(char *) buf; 2031 syscallarg(size_t) count; 2032 } */ *uap = v; 2033 struct vnode *vp; 2034 struct iovec aiov; 2035 struct uio auio; 2036 int error; 2037 struct nameidata nd; 2038 2039 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2040 SCARG(uap, path), p); 2041 if ((error = namei(&nd)) != 0) 2042 return (error); 2043 vp = nd.ni_vp; 2044 if (vp->v_type != VLNK) 2045 error = EINVAL; 2046 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2047 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2048 aiov.iov_base = SCARG(uap, buf); 2049 aiov.iov_len = SCARG(uap, count); 2050 auio.uio_iov = &aiov; 2051 auio.uio_iovcnt = 1; 2052 auio.uio_offset = 0; 2053 auio.uio_rw = UIO_READ; 2054 auio.uio_segflg = UIO_USERSPACE; 2055 auio.uio_procp = p; 2056 auio.uio_resid = SCARG(uap, count); 2057 error = VOP_READLINK(vp, &auio, p->p_ucred); 2058 } 2059 vput(vp); 2060 *retval = SCARG(uap, count) - auio.uio_resid; 2061 return (error); 2062 } 2063 2064 /* 2065 * Change flags of a file given a path name. 2066 */ 2067 /* ARGSUSED */ 2068 int 2069 sys_chflags(p, v, retval) 2070 struct proc *p; 2071 void *v; 2072 register_t *retval; 2073 { 2074 struct sys_chflags_args /* { 2075 syscallarg(const char *) path; 2076 syscallarg(u_long) flags; 2077 } */ *uap = v; 2078 struct vnode *vp; 2079 int error; 2080 struct nameidata nd; 2081 2082 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2083 if ((error = namei(&nd)) != 0) 2084 return (error); 2085 vp = nd.ni_vp; 2086 error = change_flags(vp, SCARG(uap, flags), p); 2087 vput(vp); 2088 return (error); 2089 } 2090 2091 /* 2092 * Change flags of a file given a file descriptor. 2093 */ 2094 /* ARGSUSED */ 2095 int 2096 sys_fchflags(p, v, retval) 2097 struct proc *p; 2098 void *v; 2099 register_t *retval; 2100 { 2101 struct sys_fchflags_args /* { 2102 syscallarg(int) fd; 2103 syscallarg(u_long) flags; 2104 } */ *uap = v; 2105 struct vnode *vp; 2106 struct file *fp; 2107 int error; 2108 2109 /* getvnode() will use the descriptor for us */ 2110 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2111 return (error); 2112 vp = (struct vnode *)fp->f_data; 2113 error = change_flags(vp, SCARG(uap, flags), p); 2114 VOP_UNLOCK(vp, 0); 2115 FILE_UNUSE(fp, p); 2116 return (error); 2117 } 2118 2119 /* 2120 * Change flags of a file given a path name; this version does 2121 * not follow links. 2122 */ 2123 int 2124 sys_lchflags(p, v, retval) 2125 struct proc *p; 2126 void *v; 2127 register_t *retval; 2128 { 2129 struct sys_lchflags_args /* { 2130 syscallarg(const char *) path; 2131 syscallarg(u_long) flags; 2132 } */ *uap = v; 2133 struct vnode *vp; 2134 int error; 2135 struct nameidata nd; 2136 2137 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2138 if ((error = namei(&nd)) != 0) 2139 return (error); 2140 vp = nd.ni_vp; 2141 error = change_flags(vp, SCARG(uap, flags), p); 2142 vput(vp); 2143 return (error); 2144 } 2145 2146 /* 2147 * Common routine to change flags of a file. 2148 */ 2149 int 2150 change_flags(vp, flags, p) 2151 struct vnode *vp; 2152 u_long flags; 2153 struct proc *p; 2154 { 2155 struct vattr vattr; 2156 int error; 2157 2158 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2159 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2160 /* 2161 * Non-superusers cannot change the flags on devices, even if they 2162 * own them. 2163 */ 2164 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2165 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2166 goto out; 2167 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2168 error = EINVAL; 2169 goto out; 2170 } 2171 } 2172 VATTR_NULL(&vattr); 2173 vattr.va_flags = flags; 2174 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2175 out: 2176 return (error); 2177 } 2178 2179 /* 2180 * Change mode of a file given path name; this version follows links. 2181 */ 2182 /* ARGSUSED */ 2183 int 2184 sys_chmod(p, v, retval) 2185 struct proc *p; 2186 void *v; 2187 register_t *retval; 2188 { 2189 struct sys_chmod_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, FOLLOW, 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 * Change mode of a file given a file descriptor. 2208 */ 2209 /* ARGSUSED */ 2210 int 2211 sys_fchmod(p, v, retval) 2212 struct proc *p; 2213 void *v; 2214 register_t *retval; 2215 { 2216 struct sys_fchmod_args /* { 2217 syscallarg(int) fd; 2218 syscallarg(int) mode; 2219 } */ *uap = v; 2220 struct file *fp; 2221 int error; 2222 2223 /* getvnode() will use the descriptor for us */ 2224 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2225 return (error); 2226 2227 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2228 FILE_UNUSE(fp, p); 2229 return (error); 2230 } 2231 2232 /* 2233 * Change mode of a file given path name; this version does not follow links. 2234 */ 2235 /* ARGSUSED */ 2236 int 2237 sys_lchmod(p, v, retval) 2238 struct proc *p; 2239 void *v; 2240 register_t *retval; 2241 { 2242 struct sys_lchmod_args /* { 2243 syscallarg(const char *) path; 2244 syscallarg(int) mode; 2245 } */ *uap = v; 2246 int error; 2247 struct nameidata nd; 2248 2249 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2250 if ((error = namei(&nd)) != 0) 2251 return (error); 2252 2253 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2254 2255 vrele(nd.ni_vp); 2256 return (error); 2257 } 2258 2259 /* 2260 * Common routine to set mode given a vnode. 2261 */ 2262 static int 2263 change_mode(vp, mode, p) 2264 struct vnode *vp; 2265 int mode; 2266 struct proc *p; 2267 { 2268 struct vattr vattr; 2269 int error; 2270 2271 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2272 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2273 VATTR_NULL(&vattr); 2274 vattr.va_mode = mode & ALLPERMS; 2275 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2276 VOP_UNLOCK(vp, 0); 2277 return (error); 2278 } 2279 2280 /* 2281 * Set ownership given a path name; this version follows links. 2282 */ 2283 /* ARGSUSED */ 2284 int 2285 sys_chown(p, v, retval) 2286 struct proc *p; 2287 void *v; 2288 register_t *retval; 2289 { 2290 struct sys_chown_args /* { 2291 syscallarg(const char *) path; 2292 syscallarg(uid_t) uid; 2293 syscallarg(gid_t) gid; 2294 } */ *uap = v; 2295 int error; 2296 struct nameidata nd; 2297 2298 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2299 if ((error = namei(&nd)) != 0) 2300 return (error); 2301 2302 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2303 2304 vrele(nd.ni_vp); 2305 return (error); 2306 } 2307 2308 /* 2309 * Set ownership given a path name; this version follows links. 2310 * Provides POSIX semantics. 2311 */ 2312 /* ARGSUSED */ 2313 int 2314 sys___posix_chown(p, v, retval) 2315 struct proc *p; 2316 void *v; 2317 register_t *retval; 2318 { 2319 struct sys_chown_args /* { 2320 syscallarg(const char *) path; 2321 syscallarg(uid_t) uid; 2322 syscallarg(gid_t) gid; 2323 } */ *uap = v; 2324 int error; 2325 struct nameidata nd; 2326 2327 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2328 if ((error = namei(&nd)) != 0) 2329 return (error); 2330 2331 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2332 2333 vrele(nd.ni_vp); 2334 return (error); 2335 } 2336 2337 /* 2338 * Set ownership given a file descriptor. 2339 */ 2340 /* ARGSUSED */ 2341 int 2342 sys_fchown(p, v, retval) 2343 struct proc *p; 2344 void *v; 2345 register_t *retval; 2346 { 2347 struct sys_fchown_args /* { 2348 syscallarg(int) fd; 2349 syscallarg(uid_t) uid; 2350 syscallarg(gid_t) gid; 2351 } */ *uap = v; 2352 int error; 2353 struct file *fp; 2354 2355 /* getvnode() will use the descriptor for us */ 2356 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2357 return (error); 2358 2359 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2360 SCARG(uap, gid), p, 0); 2361 FILE_UNUSE(fp, p); 2362 return (error); 2363 } 2364 2365 /* 2366 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2367 */ 2368 /* ARGSUSED */ 2369 int 2370 sys___posix_fchown(p, v, retval) 2371 struct proc *p; 2372 void *v; 2373 register_t *retval; 2374 { 2375 struct sys_fchown_args /* { 2376 syscallarg(int) fd; 2377 syscallarg(uid_t) uid; 2378 syscallarg(gid_t) gid; 2379 } */ *uap = v; 2380 int error; 2381 struct file *fp; 2382 2383 /* getvnode() will use the descriptor for us */ 2384 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2385 return (error); 2386 2387 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2388 SCARG(uap, gid), p, 1); 2389 FILE_UNUSE(fp, p); 2390 return (error); 2391 } 2392 2393 /* 2394 * Set ownership given a path name; this version does not follow links. 2395 */ 2396 /* ARGSUSED */ 2397 int 2398 sys_lchown(p, v, retval) 2399 struct proc *p; 2400 void *v; 2401 register_t *retval; 2402 { 2403 struct sys_lchown_args /* { 2404 syscallarg(const char *) path; 2405 syscallarg(uid_t) uid; 2406 syscallarg(gid_t) gid; 2407 } */ *uap = v; 2408 int error; 2409 struct nameidata nd; 2410 2411 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2412 if ((error = namei(&nd)) != 0) 2413 return (error); 2414 2415 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2416 2417 vrele(nd.ni_vp); 2418 return (error); 2419 } 2420 2421 /* 2422 * Set ownership given a path name; this version does not follow links. 2423 * Provides POSIX/XPG semantics. 2424 */ 2425 /* ARGSUSED */ 2426 int 2427 sys___posix_lchown(p, v, retval) 2428 struct proc *p; 2429 void *v; 2430 register_t *retval; 2431 { 2432 struct sys_lchown_args /* { 2433 syscallarg(const char *) path; 2434 syscallarg(uid_t) uid; 2435 syscallarg(gid_t) gid; 2436 } */ *uap = v; 2437 int error; 2438 struct nameidata nd; 2439 2440 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2441 if ((error = namei(&nd)) != 0) 2442 return (error); 2443 2444 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2445 2446 vrele(nd.ni_vp); 2447 return (error); 2448 } 2449 2450 /* 2451 * Common routine to set ownership given a vnode. 2452 */ 2453 static int 2454 change_owner(vp, uid, gid, p, posix_semantics) 2455 struct vnode *vp; 2456 uid_t uid; 2457 gid_t gid; 2458 struct proc *p; 2459 int posix_semantics; 2460 { 2461 struct vattr vattr; 2462 mode_t newmode; 2463 int error; 2464 2465 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2466 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2467 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2468 goto out; 2469 2470 #define CHANGED(x) ((x) != -1) 2471 newmode = vattr.va_mode; 2472 if (posix_semantics) { 2473 /* 2474 * POSIX/XPG semantics: if the caller is not the super-user, 2475 * clear set-user-id and set-group-id bits. Both POSIX and 2476 * the XPG consider the behaviour for calls by the super-user 2477 * implementation-defined; we leave the set-user-id and set- 2478 * group-id settings intact in that case. 2479 */ 2480 if (suser(p->p_ucred, NULL) != 0) 2481 newmode &= ~(S_ISUID | S_ISGID); 2482 } else { 2483 /* 2484 * NetBSD semantics: when changing owner and/or group, 2485 * clear the respective bit(s). 2486 */ 2487 if (CHANGED(uid)) 2488 newmode &= ~S_ISUID; 2489 if (CHANGED(gid)) 2490 newmode &= ~S_ISGID; 2491 } 2492 /* Update va_mode iff altered. */ 2493 if (vattr.va_mode == newmode) 2494 newmode = VNOVAL; 2495 2496 VATTR_NULL(&vattr); 2497 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2498 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2499 vattr.va_mode = newmode; 2500 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2501 #undef CHANGED 2502 2503 out: 2504 VOP_UNLOCK(vp, 0); 2505 return (error); 2506 } 2507 2508 /* 2509 * Set the access and modification times given a path name; this 2510 * version follows links. 2511 */ 2512 /* ARGSUSED */ 2513 int 2514 sys_utimes(p, v, retval) 2515 struct proc *p; 2516 void *v; 2517 register_t *retval; 2518 { 2519 struct sys_utimes_args /* { 2520 syscallarg(const char *) path; 2521 syscallarg(const struct timeval *) tptr; 2522 } */ *uap = v; 2523 int error; 2524 struct nameidata nd; 2525 2526 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2527 if ((error = namei(&nd)) != 0) 2528 return (error); 2529 2530 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2531 2532 vrele(nd.ni_vp); 2533 return (error); 2534 } 2535 2536 /* 2537 * Set the access and modification times given a file descriptor. 2538 */ 2539 /* ARGSUSED */ 2540 int 2541 sys_futimes(p, v, retval) 2542 struct proc *p; 2543 void *v; 2544 register_t *retval; 2545 { 2546 struct sys_futimes_args /* { 2547 syscallarg(int) fd; 2548 syscallarg(const struct timeval *) tptr; 2549 } */ *uap = v; 2550 int error; 2551 struct file *fp; 2552 2553 /* getvnode() will use the descriptor for us */ 2554 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2555 return (error); 2556 2557 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2558 FILE_UNUSE(fp, p); 2559 return (error); 2560 } 2561 2562 /* 2563 * Set the access and modification times given a path name; this 2564 * version does not follow links. 2565 */ 2566 /* ARGSUSED */ 2567 int 2568 sys_lutimes(p, v, retval) 2569 struct proc *p; 2570 void *v; 2571 register_t *retval; 2572 { 2573 struct sys_lutimes_args /* { 2574 syscallarg(const char *) path; 2575 syscallarg(const struct timeval *) tptr; 2576 } */ *uap = v; 2577 int error; 2578 struct nameidata nd; 2579 2580 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2581 if ((error = namei(&nd)) != 0) 2582 return (error); 2583 2584 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2585 2586 vrele(nd.ni_vp); 2587 return (error); 2588 } 2589 2590 /* 2591 * Common routine to set access and modification times given a vnode. 2592 */ 2593 static int 2594 change_utimes(vp, tptr, p) 2595 struct vnode *vp; 2596 const struct timeval *tptr; 2597 struct proc *p; 2598 { 2599 struct timeval tv[2]; 2600 struct vattr vattr; 2601 int error; 2602 2603 VATTR_NULL(&vattr); 2604 if (tptr == NULL) { 2605 microtime(&tv[0]); 2606 tv[1] = tv[0]; 2607 vattr.va_vaflags |= VA_UTIMES_NULL; 2608 } else { 2609 error = copyin(tptr, tv, sizeof(tv)); 2610 if (error) 2611 return (error); 2612 } 2613 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2615 vattr.va_atime.tv_sec = tv[0].tv_sec; 2616 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2617 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2618 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2619 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2620 VOP_UNLOCK(vp, 0); 2621 return (error); 2622 } 2623 2624 /* 2625 * Truncate a file given its path name. 2626 */ 2627 /* ARGSUSED */ 2628 int 2629 sys_truncate(p, v, retval) 2630 struct proc *p; 2631 void *v; 2632 register_t *retval; 2633 { 2634 struct sys_truncate_args /* { 2635 syscallarg(const char *) path; 2636 syscallarg(int) pad; 2637 syscallarg(off_t) length; 2638 } */ *uap = v; 2639 struct vnode *vp; 2640 struct vattr vattr; 2641 int error; 2642 struct nameidata nd; 2643 2644 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2645 if ((error = namei(&nd)) != 0) 2646 return (error); 2647 vp = nd.ni_vp; 2648 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2649 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2650 if (vp->v_type == VDIR) 2651 error = EISDIR; 2652 else if ((error = vn_writechk(vp)) == 0 && 2653 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2654 VATTR_NULL(&vattr); 2655 vattr.va_size = SCARG(uap, length); 2656 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2657 } 2658 vput(vp); 2659 return (error); 2660 } 2661 2662 /* 2663 * Truncate a file given a file descriptor. 2664 */ 2665 /* ARGSUSED */ 2666 int 2667 sys_ftruncate(p, v, retval) 2668 struct proc *p; 2669 void *v; 2670 register_t *retval; 2671 { 2672 struct sys_ftruncate_args /* { 2673 syscallarg(int) fd; 2674 syscallarg(int) pad; 2675 syscallarg(off_t) length; 2676 } */ *uap = v; 2677 struct vattr vattr; 2678 struct vnode *vp; 2679 struct file *fp; 2680 int error; 2681 2682 /* getvnode() will use the descriptor for us */ 2683 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2684 return (error); 2685 if ((fp->f_flag & FWRITE) == 0) { 2686 error = EINVAL; 2687 goto out; 2688 } 2689 vp = (struct vnode *)fp->f_data; 2690 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2691 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2692 if (vp->v_type == VDIR) 2693 error = EISDIR; 2694 else if ((error = vn_writechk(vp)) == 0) { 2695 VATTR_NULL(&vattr); 2696 vattr.va_size = SCARG(uap, length); 2697 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2698 } 2699 VOP_UNLOCK(vp, 0); 2700 out: 2701 FILE_UNUSE(fp, p); 2702 return (error); 2703 } 2704 2705 /* 2706 * Sync an open file. 2707 */ 2708 /* ARGSUSED */ 2709 int 2710 sys_fsync(p, v, retval) 2711 struct proc *p; 2712 void *v; 2713 register_t *retval; 2714 { 2715 struct sys_fsync_args /* { 2716 syscallarg(int) fd; 2717 } */ *uap = v; 2718 struct vnode *vp; 2719 struct file *fp; 2720 int error; 2721 2722 /* getvnode() will use the descriptor for us */ 2723 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2724 return (error); 2725 vp = (struct vnode *)fp->f_data; 2726 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2727 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2728 if (error == 0 && bioops.io_fsync != NULL && 2729 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2730 (*bioops.io_fsync)(vp); 2731 VOP_UNLOCK(vp, 0); 2732 FILE_UNUSE(fp, p); 2733 return (error); 2734 } 2735 2736 /* 2737 * Sync the data of an open file. 2738 */ 2739 /* ARGSUSED */ 2740 int 2741 sys_fdatasync(p, v, retval) 2742 struct proc *p; 2743 void *v; 2744 register_t *retval; 2745 { 2746 struct sys_fdatasync_args /* { 2747 syscallarg(int) fd; 2748 } */ *uap = v; 2749 struct vnode *vp; 2750 struct file *fp; 2751 int error; 2752 2753 /* getvnode() will use the descriptor for us */ 2754 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2755 return (error); 2756 vp = (struct vnode *)fp->f_data; 2757 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2758 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2759 VOP_UNLOCK(vp, 0); 2760 FILE_UNUSE(fp, p); 2761 return (error); 2762 } 2763 2764 /* 2765 * Rename files, (standard) BSD semantics frontend. 2766 */ 2767 /* ARGSUSED */ 2768 int 2769 sys_rename(p, v, retval) 2770 struct proc *p; 2771 void *v; 2772 register_t *retval; 2773 { 2774 struct sys_rename_args /* { 2775 syscallarg(const char *) from; 2776 syscallarg(const char *) to; 2777 } */ *uap = v; 2778 2779 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2780 } 2781 2782 /* 2783 * Rename files, POSIX semantics frontend. 2784 */ 2785 /* ARGSUSED */ 2786 int 2787 sys___posix_rename(p, v, retval) 2788 struct proc *p; 2789 void *v; 2790 register_t *retval; 2791 { 2792 struct sys___posix_rename_args /* { 2793 syscallarg(const char *) from; 2794 syscallarg(const char *) to; 2795 } */ *uap = v; 2796 2797 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2798 } 2799 2800 /* 2801 * Rename files. Source and destination must either both be directories, 2802 * or both not be directories. If target is a directory, it must be empty. 2803 * If `from' and `to' refer to the same object, the value of the `retain' 2804 * argument is used to determine whether `from' will be 2805 * 2806 * (retain == 0) deleted unless `from' and `to' refer to the same 2807 * object in the file system's name space (BSD). 2808 * (retain == 1) always retained (POSIX). 2809 */ 2810 static int 2811 rename_files(from, to, p, retain) 2812 const char *from, *to; 2813 struct proc *p; 2814 int retain; 2815 { 2816 struct vnode *tvp, *fvp, *tdvp; 2817 struct nameidata fromnd, tond; 2818 int error; 2819 2820 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2821 from, p); 2822 if ((error = namei(&fromnd)) != 0) 2823 return (error); 2824 fvp = fromnd.ni_vp; 2825 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2826 UIO_USERSPACE, to, p); 2827 if ((error = namei(&tond)) != 0) { 2828 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2829 vrele(fromnd.ni_dvp); 2830 vrele(fvp); 2831 goto out1; 2832 } 2833 tdvp = tond.ni_dvp; 2834 tvp = tond.ni_vp; 2835 2836 if (tvp != NULL) { 2837 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2838 error = ENOTDIR; 2839 goto out; 2840 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2841 error = EISDIR; 2842 goto out; 2843 } 2844 } 2845 2846 if (fvp == tdvp) 2847 error = EINVAL; 2848 2849 /* 2850 * Source and destination refer to the same object. 2851 */ 2852 if (fvp == tvp) { 2853 if (retain) 2854 error = -1; 2855 else if (fromnd.ni_dvp == tdvp && 2856 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2857 !memcmp(fromnd.ni_cnd.cn_nameptr, 2858 tond.ni_cnd.cn_nameptr, 2859 fromnd.ni_cnd.cn_namelen)) 2860 error = -1; 2861 } 2862 2863 out: 2864 if (!error) { 2865 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2866 if (fromnd.ni_dvp != tdvp) 2867 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2868 if (tvp) { 2869 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2870 } 2871 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2872 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2873 } else { 2874 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2875 if (tdvp == tvp) 2876 vrele(tdvp); 2877 else 2878 vput(tdvp); 2879 if (tvp) 2880 vput(tvp); 2881 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2882 vrele(fromnd.ni_dvp); 2883 vrele(fvp); 2884 } 2885 vrele(tond.ni_startdir); 2886 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2887 out1: 2888 if (fromnd.ni_startdir) 2889 vrele(fromnd.ni_startdir); 2890 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2891 return (error == -1 ? 0 : error); 2892 } 2893 2894 /* 2895 * Make a directory file. 2896 */ 2897 /* ARGSUSED */ 2898 int 2899 sys_mkdir(p, v, retval) 2900 struct proc *p; 2901 void *v; 2902 register_t *retval; 2903 { 2904 struct sys_mkdir_args /* { 2905 syscallarg(const char *) path; 2906 syscallarg(int) mode; 2907 } */ *uap = v; 2908 struct vnode *vp; 2909 struct vattr vattr; 2910 int error; 2911 struct nameidata nd; 2912 2913 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2914 if ((error = namei(&nd)) != 0) 2915 return (error); 2916 vp = nd.ni_vp; 2917 if (vp != NULL) { 2918 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2919 if (nd.ni_dvp == vp) 2920 vrele(nd.ni_dvp); 2921 else 2922 vput(nd.ni_dvp); 2923 vrele(vp); 2924 return (EEXIST); 2925 } 2926 VATTR_NULL(&vattr); 2927 vattr.va_type = VDIR; 2928 vattr.va_mode = 2929 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2930 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2931 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2932 if (!error) 2933 vput(nd.ni_vp); 2934 return (error); 2935 } 2936 2937 /* 2938 * Remove a directory file. 2939 */ 2940 /* ARGSUSED */ 2941 int 2942 sys_rmdir(p, v, retval) 2943 struct proc *p; 2944 void *v; 2945 register_t *retval; 2946 { 2947 struct sys_rmdir_args /* { 2948 syscallarg(const char *) path; 2949 } */ *uap = v; 2950 struct vnode *vp; 2951 int error; 2952 struct nameidata nd; 2953 2954 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2955 SCARG(uap, path), p); 2956 if ((error = namei(&nd)) != 0) 2957 return (error); 2958 vp = nd.ni_vp; 2959 if (vp->v_type != VDIR) { 2960 error = ENOTDIR; 2961 goto out; 2962 } 2963 /* 2964 * No rmdir "." please. 2965 */ 2966 if (nd.ni_dvp == vp) { 2967 error = EINVAL; 2968 goto out; 2969 } 2970 /* 2971 * The root of a mounted filesystem cannot be deleted. 2972 */ 2973 if (vp->v_flag & VROOT) 2974 error = EBUSY; 2975 out: 2976 if (!error) { 2977 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2978 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2979 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2980 } else { 2981 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2982 if (nd.ni_dvp == vp) 2983 vrele(nd.ni_dvp); 2984 else 2985 vput(nd.ni_dvp); 2986 vput(vp); 2987 } 2988 return (error); 2989 } 2990 2991 /* 2992 * Read a block of directory entries in a file system independent format. 2993 */ 2994 int 2995 sys_getdents(p, v, retval) 2996 struct proc *p; 2997 void *v; 2998 register_t *retval; 2999 { 3000 struct sys_getdents_args /* { 3001 syscallarg(int) fd; 3002 syscallarg(char *) buf; 3003 syscallarg(size_t) count; 3004 } */ *uap = v; 3005 struct file *fp; 3006 int error, done; 3007 3008 /* getvnode() will use the descriptor for us */ 3009 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3010 return (error); 3011 if ((fp->f_flag & FREAD) == 0) { 3012 error = EBADF; 3013 goto out; 3014 } 3015 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3016 SCARG(uap, count), &done, p, 0, 0); 3017 *retval = done; 3018 out: 3019 FILE_UNUSE(fp, p); 3020 return (error); 3021 } 3022 3023 /* 3024 * Set the mode mask for creation of filesystem nodes. 3025 */ 3026 int 3027 sys_umask(p, v, retval) 3028 struct proc *p; 3029 void *v; 3030 register_t *retval; 3031 { 3032 struct sys_umask_args /* { 3033 syscallarg(mode_t) newmask; 3034 } */ *uap = v; 3035 struct cwdinfo *cwdi; 3036 3037 cwdi = p->p_cwdi; 3038 *retval = cwdi->cwdi_cmask; 3039 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3040 return (0); 3041 } 3042 3043 /* 3044 * Void all references to file by ripping underlying filesystem 3045 * away from vnode. 3046 */ 3047 /* ARGSUSED */ 3048 int 3049 sys_revoke(p, v, retval) 3050 struct proc *p; 3051 void *v; 3052 register_t *retval; 3053 { 3054 struct sys_revoke_args /* { 3055 syscallarg(const char *) path; 3056 } */ *uap = v; 3057 struct vnode *vp; 3058 struct vattr vattr; 3059 int error; 3060 struct nameidata nd; 3061 3062 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3063 if ((error = namei(&nd)) != 0) 3064 return (error); 3065 vp = nd.ni_vp; 3066 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3067 goto out; 3068 if (p->p_ucred->cr_uid != vattr.va_uid && 3069 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3070 goto out; 3071 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3072 VOP_REVOKE(vp, REVOKEALL); 3073 out: 3074 vrele(vp); 3075 return (error); 3076 } 3077 3078 /* 3079 * Convert a user file descriptor to a kernel file entry. 3080 */ 3081 int 3082 getvnode(fdp, fd, fpp) 3083 struct filedesc *fdp; 3084 int fd; 3085 struct file **fpp; 3086 { 3087 struct vnode *vp; 3088 struct file *fp; 3089 3090 if ((fp = fd_getfile(fdp, fd)) == NULL) 3091 return (EBADF); 3092 3093 FILE_USE(fp); 3094 3095 if (fp->f_type != DTYPE_VNODE) { 3096 FILE_UNUSE(fp, NULL); 3097 return (EINVAL); 3098 } 3099 3100 vp = (struct vnode *)fp->f_data; 3101 if (vp->v_type == VBAD) { 3102 FILE_UNUSE(fp, NULL); 3103 return (EBADF); 3104 } 3105 3106 *fpp = fp; 3107 return (0); 3108 } 3109
Indexes created Sat Sep 27 14:09:57 GMT 2025