1 /* $NetBSD: vfs_syscalls.c,v 1.187 2003/05/16 14:25:03 itojun 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 <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.187 2003/05/16 14:25:03 itojun Exp $"); 45 46 #include "opt_compat_netbsd.h" 47 #include "opt_compat_43.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/namei.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/uio.h> 60 #include <sys/malloc.h> 61 #include <sys/dirent.h> 62 #include <sys/sysctl.h> 63 #include <sys/sa.h> 64 #include <sys/syscallargs.h> 65 66 #include <miscfs/genfs/genfs.h> 67 #include <miscfs/syncfs/syncfs.h> 68 69 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 70 71 static int change_dir __P((struct nameidata *, struct proc *)); 72 static int change_flags __P((struct vnode *, u_long, struct proc *)); 73 static int change_mode __P((struct vnode *, int, struct proc *p)); 74 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 75 int)); 76 static int change_utimes __P((struct vnode *vp, const struct timeval *, 77 struct proc *p)); 78 static int rename_files __P((const char *, const char *, struct proc *, int)); 79 static int dostatfs __P((struct mount *, struct statfs *, struct proc *, int, 80 int)); 81 82 void checkdirs __P((struct vnode *)); 83 84 int dovfsusermount = 0; 85 86 /* 87 * Virtual File System System Calls 88 */ 89 90 /* 91 * Mount a file system. 92 */ 93 94 #if defined(COMPAT_09) || defined(COMPAT_43) 95 /* 96 * This table is used to maintain compatibility with 4.3BSD 97 * and NetBSD 0.9 mount syscalls. Note, the order is important! 98 * 99 * Do not modify this table. It should only contain filesystems 100 * supported by NetBSD 0.9 and 4.3BSD. 101 */ 102 const char * const mountcompatnames[] = { 103 NULL, /* 0 = MOUNT_NONE */ 104 MOUNT_FFS, /* 1 = MOUNT_UFS */ 105 MOUNT_NFS, /* 2 */ 106 MOUNT_MFS, /* 3 */ 107 MOUNT_MSDOS, /* 4 */ 108 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 109 MOUNT_FDESC, /* 6 */ 110 MOUNT_KERNFS, /* 7 */ 111 NULL, /* 8 = MOUNT_DEVFS */ 112 MOUNT_AFS, /* 9 */ 113 }; 114 const int nmountcompatnames = sizeof(mountcompatnames) / 115 sizeof(mountcompatnames[0]); 116 #endif /* COMPAT_09 || COMPAT_43 */ 117 118 /* ARGSUSED */ 119 int 120 sys_mount(l, v, retval) 121 struct lwp *l; 122 void *v; 123 register_t *retval; 124 { 125 struct sys_mount_args /* { 126 syscallarg(const char *) type; 127 syscallarg(const char *) path; 128 syscallarg(int) flags; 129 syscallarg(void *) data; 130 } */ *uap = v; 131 struct proc *p = l->l_proc; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 141 (error = suser(p->p_ucred, &p->p_acflag))) 142 return (error); 143 /* 144 * Get vnode to be covered 145 */ 146 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 147 SCARG(uap, path), p); 148 if ((error = namei(&nd)) != 0) 149 return (error); 150 vp = nd.ni_vp; 151 /* 152 * A lookup in VFS_MOUNT might result in an attempt to 153 * lock this vnode again, so make the lock recursive. 154 */ 155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 156 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 157 if ((vp->v_flag & VROOT) == 0) { 158 vput(vp); 159 return (EINVAL); 160 } 161 mp = vp->v_mount; 162 flag = mp->mnt_flag; 163 vfs = mp->mnt_op; 164 /* 165 * We only allow the filesystem to be reloaded if it 166 * is currently mounted read-only. 167 */ 168 if ((SCARG(uap, flags) & MNT_RELOAD) && 169 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 170 vput(vp); 171 return (EOPNOTSUPP); /* Needs translation */ 172 } 173 /* 174 * In "highly secure" mode, don't let the caller do anything 175 * but downgrade a filesystem from read-write to read-only. 176 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 177 */ 178 if (securelevel >= 2 && 179 SCARG(uap, flags) != MNT_GETARGS && 180 SCARG(uap, flags) != 181 (mp->mnt_flag | MNT_RDONLY | 182 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 183 vput(vp); 184 return (EPERM); 185 } 186 mp->mnt_flag |= SCARG(uap, flags) & 187 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 188 /* 189 * Only root, or the user that did the original mount is 190 * permitted to update it. 191 */ 192 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 193 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 194 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 195 vput(vp); 196 return (error); 197 } 198 /* 199 * Do not allow NFS export by non-root users. For non-root 200 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 201 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 202 */ 203 if (p->p_ucred->cr_uid != 0) { 204 if (SCARG(uap, flags) & MNT_EXPORTED) { 205 vput(vp); 206 return (EPERM); 207 } 208 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 209 if (flag & MNT_NOEXEC) 210 SCARG(uap, flags) |= MNT_NOEXEC; 211 } 212 if (vfs_busy(mp, LK_NOWAIT, 0)) { 213 vput(vp); 214 return (EPERM); 215 } 216 goto update; 217 } else { 218 if (securelevel >= 2) { 219 vput(vp); 220 return (EPERM); 221 } 222 } 223 /* 224 * If the user is not root, ensure that they own the directory 225 * onto which we are attempting to mount. 226 */ 227 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 228 (va.va_uid != p->p_ucred->cr_uid && 229 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 230 vput(vp); 231 return (error); 232 } 233 /* 234 * Do not allow NFS export by non-root users. For non-root users, 235 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 236 * mount point is already MNT_NOEXEC. 237 */ 238 if (p->p_ucred->cr_uid != 0) { 239 if (SCARG(uap, flags) & MNT_EXPORTED) { 240 vput(vp); 241 return (EPERM); 242 } 243 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 244 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 245 SCARG(uap, flags) |= MNT_NOEXEC; 246 } 247 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 248 return (error); 249 if (vp->v_type != VDIR) { 250 vput(vp); 251 return (ENOTDIR); 252 } 253 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 254 if (error) { 255 #if defined(COMPAT_09) || defined(COMPAT_43) 256 /* 257 * Historically filesystem types were identified by number. 258 * If we get an integer for the filesystem type instead of a 259 * string, we check to see if it matches one of the historic 260 * filesystem types. 261 */ 262 u_long fsindex = (u_long)SCARG(uap, type); 263 if (fsindex >= nmountcompatnames || 264 mountcompatnames[fsindex] == NULL) { 265 vput(vp); 266 return (ENODEV); 267 } 268 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 269 #else 270 vput(vp); 271 return (error); 272 #endif 273 } 274 #ifdef COMPAT_10 275 /* Accept `ufs' as an alias for `ffs'. */ 276 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 277 strncpy(fstypename, "ffs", MFSNAMELEN); 278 #endif 279 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 280 vput(vp); 281 return (ENODEV); 282 } 283 if (vp->v_mountedhere != NULL) { 284 vput(vp); 285 return (EBUSY); 286 } 287 288 /* 289 * Allocate and initialize the file system. 290 */ 291 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 292 M_MOUNT, M_WAITOK); 293 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 294 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 295 (void)vfs_busy(mp, LK_NOWAIT, 0); 296 mp->mnt_op = vfs; 297 vfs->vfs_refcount++; 298 mp->mnt_vnodecovered = vp; 299 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 300 mp->mnt_unmounter = NULL; 301 update: 302 /* 303 * Set the mount level flags. 304 */ 305 if (SCARG(uap, flags) & MNT_RDONLY) 306 mp->mnt_flag |= MNT_RDONLY; 307 else if (mp->mnt_flag & MNT_RDONLY) 308 mp->mnt_flag |= MNT_WANTRDWR; 309 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 310 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 311 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 312 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 313 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 314 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 315 MNT_SYMPERM | MNT_SOFTDEP); 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 | MNT_GETARGS)) { 321 if (mp->mnt_flag & MNT_WANTRDWR) 322 mp->mnt_flag &= ~MNT_RDONLY; 323 if (error || (mp->mnt_flag & MNT_GETARGS)) 324 mp->mnt_flag = flag; 325 mp->mnt_flag &=~ 326 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR | 327 MNT_GETARGS); 328 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 329 if (mp->mnt_syncer == NULL) 330 error = vfs_allocate_syncvnode(mp); 331 } else { 332 if (mp->mnt_syncer != NULL) 333 vfs_deallocate_syncvnode(mp); 334 } 335 vfs_unbusy(mp); 336 VOP_UNLOCK(vp, 0); 337 vrele(vp); 338 return (error); 339 } 340 /* 341 * Put the new filesystem on the mount list after root. 342 */ 343 cache_purge(vp); 344 if (!error) { 345 vp->v_mountedhere = mp; 346 simple_lock(&mountlist_slock); 347 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 348 simple_unlock(&mountlist_slock); 349 checkdirs(vp); 350 VOP_UNLOCK(vp, 0); 351 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 352 error = vfs_allocate_syncvnode(mp); 353 vfs_unbusy(mp); 354 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 355 if ((error = VFS_START(mp, 0, p))) 356 vrele(vp); 357 } else { 358 vp->v_mountedhere = (struct mount *)0; 359 vfs->vfs_refcount--; 360 vfs_unbusy(mp); 361 free(mp, M_MOUNT); 362 vput(vp); 363 } 364 return (error); 365 } 366 367 /* 368 * Scan all active processes to see if any of them have a current 369 * or root directory onto which the new filesystem has just been 370 * mounted. If so, replace them with the new mount point. 371 */ 372 void 373 checkdirs(olddp) 374 struct vnode *olddp; 375 { 376 struct cwdinfo *cwdi; 377 struct vnode *newdp; 378 struct proc *p; 379 380 if (olddp->v_usecount == 1) 381 return; 382 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 383 panic("mount: lost mount"); 384 proclist_lock_read(); 385 LIST_FOREACH(p, &allproc, p_list) { 386 cwdi = p->p_cwdi; 387 if (cwdi->cwdi_cdir == olddp) { 388 vrele(cwdi->cwdi_cdir); 389 VREF(newdp); 390 cwdi->cwdi_cdir = newdp; 391 } 392 if (cwdi->cwdi_rdir == olddp) { 393 vrele(cwdi->cwdi_rdir); 394 VREF(newdp); 395 cwdi->cwdi_rdir = newdp; 396 } 397 } 398 proclist_unlock_read(); 399 if (rootvnode == olddp) { 400 vrele(rootvnode); 401 VREF(newdp); 402 rootvnode = newdp; 403 } 404 vput(newdp); 405 } 406 407 /* 408 * Unmount a file system. 409 * 410 * Note: unmount takes a path to the vnode mounted on as argument, 411 * not special file (as before). 412 */ 413 /* ARGSUSED */ 414 int 415 sys_unmount(l, v, retval) 416 struct lwp *l; 417 void *v; 418 register_t *retval; 419 { 420 struct sys_unmount_args /* { 421 syscallarg(const char *) path; 422 syscallarg(int) flags; 423 } */ *uap = v; 424 struct proc *p = l->l_proc; 425 struct vnode *vp; 426 struct mount *mp; 427 int error; 428 struct nameidata nd; 429 430 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 431 SCARG(uap, path), p); 432 if ((error = namei(&nd)) != 0) 433 return (error); 434 vp = nd.ni_vp; 435 mp = vp->v_mount; 436 437 /* 438 * Only root, or the user that did the original mount is 439 * permitted to unmount this filesystem. 440 */ 441 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 442 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 443 vput(vp); 444 return (error); 445 } 446 447 /* 448 * Don't allow unmounting the root file system. 449 */ 450 if (mp->mnt_flag & MNT_ROOTFS) { 451 vput(vp); 452 return (EINVAL); 453 } 454 455 /* 456 * Must be the root of the filesystem 457 */ 458 if ((vp->v_flag & VROOT) == 0) { 459 vput(vp); 460 return (EINVAL); 461 } 462 vput(vp); 463 464 /* 465 * XXX Freeze syncer. Must do this before locking the 466 * mount point. See dounmount() for details. 467 */ 468 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 469 470 if (vfs_busy(mp, 0, 0)) { 471 lockmgr(&syncer_lock, LK_RELEASE, NULL); 472 return (EBUSY); 473 } 474 475 return (dounmount(mp, SCARG(uap, flags), p)); 476 } 477 478 /* 479 * Do the actual file system unmount. File system is assumed to have been 480 * marked busy by the caller. 481 */ 482 int 483 dounmount(mp, flags, p) 484 struct mount *mp; 485 int flags; 486 struct proc *p; 487 { 488 struct vnode *coveredvp; 489 int error; 490 int async; 491 int used_syncer; 492 493 simple_lock(&mountlist_slock); 494 vfs_unbusy(mp); 495 used_syncer = (mp->mnt_syncer != NULL); 496 497 /* 498 * XXX Syncer must be frozen when we get here. This should really 499 * be done on a per-mountpoint basis, but especially the softdep 500 * code possibly called from the syncer doens't exactly work on a 501 * per-mountpoint basis, so the softdep code would become a maze 502 * of vfs_busy() calls. 503 * 504 * The caller of dounmount() must acquire syncer_lock because 505 * the syncer itself acquires locks in syncer_lock -> vfs_busy 506 * order, and we must preserve that order to avoid deadlock. 507 * 508 * So, if the file system did not use the syncer, now is 509 * the time to release the syncer_lock. 510 */ 511 if (used_syncer == 0) 512 lockmgr(&syncer_lock, LK_RELEASE, NULL); 513 514 mp->mnt_flag |= MNT_UNMOUNT; 515 mp->mnt_unmounter = p; 516 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 517 if (mp->mnt_flag & MNT_EXPUBLIC) 518 vfs_setpublicfs(NULL, NULL, NULL); 519 async = mp->mnt_flag & MNT_ASYNC; 520 mp->mnt_flag &= ~MNT_ASYNC; 521 cache_purgevfs(mp); /* remove cache entries for this file sys */ 522 if (mp->mnt_syncer != NULL) 523 vfs_deallocate_syncvnode(mp); 524 if (((mp->mnt_flag & MNT_RDONLY) || 525 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 526 (flags & MNT_FORCE)) 527 error = VFS_UNMOUNT(mp, flags, p); 528 simple_lock(&mountlist_slock); 529 if (error) { 530 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 531 (void) vfs_allocate_syncvnode(mp); 532 mp->mnt_flag &= ~MNT_UNMOUNT; 533 mp->mnt_unmounter = NULL; 534 mp->mnt_flag |= async; 535 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 536 &mountlist_slock); 537 if (used_syncer) 538 lockmgr(&syncer_lock, LK_RELEASE, NULL); 539 while (mp->mnt_wcnt > 0) { 540 wakeup(mp); 541 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 542 } 543 return (error); 544 } 545 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 546 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 547 coveredvp->v_mountedhere = NULL; 548 vrele(coveredvp); 549 } 550 mp->mnt_op->vfs_refcount--; 551 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 552 panic("unmount: dangling vnode"); 553 mp->mnt_flag |= MNT_GONE; 554 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 555 if (used_syncer) 556 lockmgr(&syncer_lock, LK_RELEASE, NULL); 557 while(mp->mnt_wcnt > 0) { 558 wakeup(mp); 559 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 560 } 561 free(mp, M_MOUNT); 562 return (0); 563 } 564 565 /* 566 * Sync each mounted filesystem. 567 */ 568 #ifdef DEBUG 569 int syncprt = 0; 570 struct ctldebug debug0 = { "syncprt", &syncprt }; 571 #endif 572 573 /* ARGSUSED */ 574 int 575 sys_sync(l, v, retval) 576 struct lwp *l; 577 void *v; 578 register_t *retval; 579 { 580 struct mount *mp, *nmp; 581 int asyncflag; 582 struct proc *p = l == NULL ? &proc0 : l->l_proc; 583 584 simple_lock(&mountlist_slock); 585 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 586 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 587 nmp = mp->mnt_list.cqe_prev; 588 continue; 589 } 590 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 591 asyncflag = mp->mnt_flag & MNT_ASYNC; 592 mp->mnt_flag &= ~MNT_ASYNC; 593 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 594 if (asyncflag) 595 mp->mnt_flag |= MNT_ASYNC; 596 } 597 simple_lock(&mountlist_slock); 598 nmp = mp->mnt_list.cqe_prev; 599 vfs_unbusy(mp); 600 601 } 602 simple_unlock(&mountlist_slock); 603 #ifdef DEBUG 604 if (syncprt) 605 vfs_bufstats(); 606 #endif /* DEBUG */ 607 return (0); 608 } 609 610 /* 611 * Change filesystem quotas. 612 */ 613 /* ARGSUSED */ 614 int 615 sys_quotactl(l, v, retval) 616 struct lwp *l; 617 void *v; 618 register_t *retval; 619 { 620 struct sys_quotactl_args /* { 621 syscallarg(const char *) path; 622 syscallarg(int) cmd; 623 syscallarg(int) uid; 624 syscallarg(caddr_t) arg; 625 } */ *uap = v; 626 struct proc *p = l->l_proc; 627 struct mount *mp; 628 int error; 629 struct nameidata nd; 630 631 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 632 if ((error = namei(&nd)) != 0) 633 return (error); 634 mp = nd.ni_vp->v_mount; 635 vrele(nd.ni_vp); 636 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 637 SCARG(uap, arg), p)); 638 } 639 640 static int 641 dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags, 642 int root) 643 { 644 struct cwdinfo *cwdi = p->p_cwdi; 645 int error = 0; 646 647 /* 648 * If MNT_NOWAIT or MNT_LAZY is specified, do not 649 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 650 * overrides MNT_NOWAIT. 651 */ 652 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 653 (flags != MNT_WAIT && flags != 0)) { 654 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 655 goto done; 656 } 657 658 if ((error = VFS_STATFS(mp, sp, p)) != 0) { 659 return error; 660 } 661 662 if (cwdi->cwdi_rdir == NULL) 663 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 664 done: 665 if (cwdi->cwdi_rdir != NULL) { 666 size_t len; 667 char *bp; 668 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 669 if (!path) 670 return ENOMEM; 671 672 bp = path + MAXPATHLEN; 673 *--bp = '\0'; 674 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 675 MAXPATHLEN / 2, 0, p); 676 if (error) { 677 free(path, M_TEMP); 678 return error; 679 } 680 len = strlen(bp); 681 /* 682 * for mount points that are below our root, we can see 683 * them, so we fix up the pathname and return them. The 684 * rest we cannot see, so we don't allow viewing the 685 * data. 686 */ 687 if (strncmp(bp, sp->f_mntonname, len) == 0) { 688 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 689 sizeof(sp->f_mntonname)); 690 if (sp->f_mntonname[0] == '\0') 691 (void)strlcpy(sp->f_mntonname, "/", 692 sizeof(sp->f_mntonname)); 693 } else { 694 if (root) 695 (void)strlcpy(sp->f_mntonname, "/", 696 sizeof(sp->f_mntonname)); 697 else 698 error = EPERM; 699 } 700 free(path, M_TEMP); 701 } 702 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 703 sp->f_oflags = sp->f_flags & 0xffff; 704 return error; 705 } 706 707 /* 708 * Get filesystem statistics. 709 */ 710 /* ARGSUSED */ 711 int 712 sys_statfs(l, v, retval) 713 struct lwp *l; 714 void *v; 715 register_t *retval; 716 { 717 struct sys_statfs_args /* { 718 syscallarg(const char *) path; 719 syscallarg(struct statfs *) buf; 720 } */ *uap = v; 721 struct proc *p = l->l_proc; 722 struct mount *mp; 723 struct statfs sbuf; 724 int error; 725 struct nameidata nd; 726 727 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 728 if ((error = namei(&nd)) != 0) 729 return error; 730 mp = nd.ni_vp->v_mount; 731 vrele(nd.ni_vp); 732 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 733 return error; 734 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 735 } 736 737 /* 738 * Get filesystem statistics. 739 */ 740 /* ARGSUSED */ 741 int 742 sys_fstatfs(l, v, retval) 743 struct lwp *l; 744 void *v; 745 register_t *retval; 746 { 747 struct sys_fstatfs_args /* { 748 syscallarg(int) fd; 749 syscallarg(struct statfs *) buf; 750 } */ *uap = v; 751 struct proc *p = l->l_proc; 752 struct file *fp; 753 struct mount *mp; 754 struct statfs sbuf; 755 int error; 756 757 /* getvnode() will use the descriptor for us */ 758 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 759 return (error); 760 mp = ((struct vnode *)fp->f_data)->v_mount; 761 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 762 goto out; 763 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 764 out: 765 FILE_UNUSE(fp, p); 766 return error; 767 } 768 769 770 /* 771 * Get statistics on all filesystems. 772 */ 773 int 774 sys_getfsstat(l, v, retval) 775 struct lwp *l; 776 void *v; 777 register_t *retval; 778 { 779 struct sys_getfsstat_args /* { 780 syscallarg(struct statfs *) buf; 781 syscallarg(long) bufsize; 782 syscallarg(int) flags; 783 } */ *uap = v; 784 int root = 0; 785 struct proc *p = l->l_proc; 786 struct mount *mp, *nmp; 787 struct statfs sbuf; 788 caddr_t sfsp; 789 long count, maxcount, error = 0; 790 791 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 792 sfsp = (caddr_t)SCARG(uap, buf); 793 simple_lock(&mountlist_slock); 794 count = 0; 795 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 796 mp = nmp) { 797 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 798 nmp = CIRCLEQ_NEXT(mp, mnt_list); 799 continue; 800 } 801 if (sfsp && count < maxcount) { 802 error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0); 803 if (error) { 804 simple_lock(&mountlist_slock); 805 nmp = CIRCLEQ_NEXT(mp, mnt_list); 806 vfs_unbusy(mp); 807 continue; 808 } 809 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 810 if (error) { 811 vfs_unbusy(mp); 812 return (error); 813 } 814 sfsp += sizeof(sbuf); 815 root |= strcmp(sbuf.f_mntonname, "/") == 0; 816 } 817 count++; 818 simple_lock(&mountlist_slock); 819 nmp = CIRCLEQ_NEXT(mp, mnt_list); 820 vfs_unbusy(mp); 821 } 822 simple_unlock(&mountlist_slock); 823 if (root == 0 && p->p_cwdi->cwdi_rdir) { 824 /* 825 * fake a root entry 826 */ 827 if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 828 SCARG(uap, flags), 1)) != 0) 829 return error; 830 if (sfsp) 831 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 832 count++; 833 } 834 if (sfsp && count > maxcount) 835 *retval = maxcount; 836 else 837 *retval = count; 838 return error; 839 } 840 841 /* 842 * Change current working directory to a given file descriptor. 843 */ 844 /* ARGSUSED */ 845 int 846 sys_fchdir(l, v, retval) 847 struct lwp *l; 848 void *v; 849 register_t *retval; 850 { 851 struct sys_fchdir_args /* { 852 syscallarg(int) fd; 853 } */ *uap = v; 854 struct proc *p = l->l_proc; 855 struct filedesc *fdp = p->p_fd; 856 struct cwdinfo *cwdi = p->p_cwdi; 857 struct vnode *vp, *tdp; 858 struct mount *mp; 859 struct file *fp; 860 int error; 861 862 /* getvnode() will use the descriptor for us */ 863 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 864 return (error); 865 vp = (struct vnode *)fp->f_data; 866 867 VREF(vp); 868 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 869 if (vp->v_type != VDIR) 870 error = ENOTDIR; 871 else 872 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 873 while (!error && (mp = vp->v_mountedhere) != NULL) { 874 if (vfs_busy(mp, 0, 0)) 875 continue; 876 error = VFS_ROOT(mp, &tdp); 877 vfs_unbusy(mp); 878 if (error) 879 break; 880 vput(vp); 881 vp = tdp; 882 } 883 if (error) { 884 vput(vp); 885 goto out; 886 } 887 VOP_UNLOCK(vp, 0); 888 889 /* 890 * Disallow changing to a directory not under the process's 891 * current root directory (if there is one). 892 */ 893 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 894 vrele(vp); 895 error = EPERM; /* operation not permitted */ 896 goto out; 897 } 898 899 vrele(cwdi->cwdi_cdir); 900 cwdi->cwdi_cdir = vp; 901 out: 902 FILE_UNUSE(fp, p); 903 return (error); 904 } 905 906 /* 907 * Change this process's notion of the root directory to a given file descriptor. 908 */ 909 910 int 911 sys_fchroot(l, v, retval) 912 struct lwp *l; 913 void *v; 914 register_t *retval; 915 { 916 struct sys_fchroot_args *uap = v; 917 struct proc *p = l->l_proc; 918 struct filedesc *fdp = p->p_fd; 919 struct cwdinfo *cwdi = p->p_cwdi; 920 struct vnode *vp; 921 struct file *fp; 922 int error; 923 924 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 925 return error; 926 /* getvnode() will use the descriptor for us */ 927 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 928 return error; 929 vp = (struct vnode *) fp->f_data; 930 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 931 if (vp->v_type != VDIR) 932 error = ENOTDIR; 933 else 934 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 935 VOP_UNLOCK(vp, 0); 936 if (error) 937 goto out; 938 VREF(vp); 939 940 /* 941 * Prevent escaping from chroot by putting the root under 942 * the working directory. Silently chdir to / if we aren't 943 * already there. 944 */ 945 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 946 /* 947 * XXX would be more failsafe to change directory to a 948 * deadfs node here instead 949 */ 950 vrele(cwdi->cwdi_cdir); 951 VREF(vp); 952 cwdi->cwdi_cdir = vp; 953 } 954 955 if (cwdi->cwdi_rdir != NULL) 956 vrele(cwdi->cwdi_rdir); 957 cwdi->cwdi_rdir = vp; 958 out: 959 FILE_UNUSE(fp, p); 960 return (error); 961 } 962 963 964 965 /* 966 * Change current working directory (``.''). 967 */ 968 /* ARGSUSED */ 969 int 970 sys_chdir(l, v, retval) 971 struct lwp *l; 972 void *v; 973 register_t *retval; 974 { 975 struct sys_chdir_args /* { 976 syscallarg(const char *) path; 977 } */ *uap = v; 978 struct proc *p = l->l_proc; 979 struct cwdinfo *cwdi = p->p_cwdi; 980 int error; 981 struct nameidata nd; 982 983 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 984 SCARG(uap, path), p); 985 if ((error = change_dir(&nd, p)) != 0) 986 return (error); 987 vrele(cwdi->cwdi_cdir); 988 cwdi->cwdi_cdir = nd.ni_vp; 989 return (0); 990 } 991 992 /* 993 * Change notion of root (``/'') directory. 994 */ 995 /* ARGSUSED */ 996 int 997 sys_chroot(l, v, retval) 998 struct lwp *l; 999 void *v; 1000 register_t *retval; 1001 { 1002 struct sys_chroot_args /* { 1003 syscallarg(const char *) path; 1004 } */ *uap = v; 1005 struct proc *p = l->l_proc; 1006 struct cwdinfo *cwdi = p->p_cwdi; 1007 struct vnode *vp; 1008 int error; 1009 struct nameidata nd; 1010 1011 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1012 return (error); 1013 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1014 SCARG(uap, path), p); 1015 if ((error = change_dir(&nd, p)) != 0) 1016 return (error); 1017 if (cwdi->cwdi_rdir != NULL) 1018 vrele(cwdi->cwdi_rdir); 1019 vp = nd.ni_vp; 1020 cwdi->cwdi_rdir = vp; 1021 1022 /* 1023 * Prevent escaping from chroot by putting the root under 1024 * the working directory. Silently chdir to / if we aren't 1025 * already there. 1026 */ 1027 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1028 /* 1029 * XXX would be more failsafe to change directory to a 1030 * deadfs node here instead 1031 */ 1032 vrele(cwdi->cwdi_cdir); 1033 VREF(vp); 1034 cwdi->cwdi_cdir = vp; 1035 } 1036 1037 return (0); 1038 } 1039 1040 /* 1041 * Common routine for chroot and chdir. 1042 */ 1043 static int 1044 change_dir(ndp, p) 1045 struct nameidata *ndp; 1046 struct proc *p; 1047 { 1048 struct vnode *vp; 1049 int error; 1050 1051 if ((error = namei(ndp)) != 0) 1052 return (error); 1053 vp = ndp->ni_vp; 1054 if (vp->v_type != VDIR) 1055 error = ENOTDIR; 1056 else 1057 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1058 1059 if (error) 1060 vput(vp); 1061 else 1062 VOP_UNLOCK(vp, 0); 1063 return (error); 1064 } 1065 1066 /* 1067 * Check permissions, allocate an open file structure, 1068 * and call the device open routine if any. 1069 */ 1070 int 1071 sys_open(l, v, retval) 1072 struct lwp *l; 1073 void *v; 1074 register_t *retval; 1075 { 1076 struct sys_open_args /* { 1077 syscallarg(const char *) path; 1078 syscallarg(int) flags; 1079 syscallarg(int) mode; 1080 } */ *uap = v; 1081 struct proc *p = l->l_proc; 1082 struct cwdinfo *cwdi = p->p_cwdi; 1083 struct filedesc *fdp = p->p_fd; 1084 struct file *fp; 1085 struct vnode *vp; 1086 int flags, cmode; 1087 int type, indx, error; 1088 struct flock lf; 1089 struct nameidata nd; 1090 1091 flags = FFLAGS(SCARG(uap, flags)); 1092 if ((flags & (FREAD | FWRITE)) == 0) 1093 return (EINVAL); 1094 /* falloc() will use the file descriptor for us */ 1095 if ((error = falloc(p, &fp, &indx)) != 0) 1096 return (error); 1097 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1098 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1099 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1100 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1101 FILE_UNUSE(fp, p); 1102 ffree(fp); 1103 if ((error == ENODEV || error == ENXIO) && 1104 p->p_dupfd >= 0 && /* XXX from fdopen */ 1105 (error = 1106 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1107 *retval = indx; 1108 return (0); 1109 } 1110 if (error == ERESTART) 1111 error = EINTR; 1112 fdremove(fdp, indx); 1113 return (error); 1114 } 1115 p->p_dupfd = 0; 1116 vp = nd.ni_vp; 1117 fp->f_flag = flags & FMASK; 1118 fp->f_type = DTYPE_VNODE; 1119 fp->f_ops = &vnops; 1120 fp->f_data = vp; 1121 if (flags & (O_EXLOCK | O_SHLOCK)) { 1122 lf.l_whence = SEEK_SET; 1123 lf.l_start = 0; 1124 lf.l_len = 0; 1125 if (flags & O_EXLOCK) 1126 lf.l_type = F_WRLCK; 1127 else 1128 lf.l_type = F_RDLCK; 1129 type = F_FLOCK; 1130 if ((flags & FNONBLOCK) == 0) 1131 type |= F_WAIT; 1132 VOP_UNLOCK(vp, 0); 1133 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1134 if (error) { 1135 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1136 FILE_UNUSE(fp, p); 1137 ffree(fp); 1138 fdremove(fdp, indx); 1139 return (error); 1140 } 1141 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1142 fp->f_flag |= FHASLOCK; 1143 } 1144 VOP_UNLOCK(vp, 0); 1145 *retval = indx; 1146 FILE_SET_MATURE(fp); 1147 FILE_UNUSE(fp, p); 1148 return (0); 1149 } 1150 1151 /* 1152 * Get file handle system call 1153 */ 1154 int 1155 sys_getfh(l, v, retval) 1156 struct lwp *l; 1157 void *v; 1158 register_t *retval; 1159 { 1160 struct sys_getfh_args /* { 1161 syscallarg(char *) fname; 1162 syscallarg(fhandle_t *) fhp; 1163 } */ *uap = v; 1164 struct proc *p = l->l_proc; 1165 struct vnode *vp; 1166 fhandle_t fh; 1167 int error; 1168 struct nameidata nd; 1169 1170 /* 1171 * Must be super user 1172 */ 1173 error = suser(p->p_ucred, &p->p_acflag); 1174 if (error) 1175 return (error); 1176 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1177 SCARG(uap, fname), p); 1178 error = namei(&nd); 1179 if (error) 1180 return (error); 1181 vp = nd.ni_vp; 1182 memset(&fh, 0, sizeof(fh)); 1183 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1184 error = VFS_VPTOFH(vp, &fh.fh_fid); 1185 vput(vp); 1186 if (error) 1187 return (error); 1188 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1189 return (error); 1190 } 1191 1192 /* 1193 * Open a file given a file handle. 1194 * 1195 * Check permissions, allocate an open file structure, 1196 * and call the device open routine if any. 1197 */ 1198 int 1199 sys_fhopen(l, v, retval) 1200 struct lwp *l; 1201 void *v; 1202 register_t *retval; 1203 { 1204 struct sys_fhopen_args /* { 1205 syscallarg(const fhandle_t *) fhp; 1206 syscallarg(int) flags; 1207 } */ *uap = v; 1208 struct proc *p = l->l_proc; 1209 struct filedesc *fdp = p->p_fd; 1210 struct file *fp; 1211 struct vnode *vp = NULL; 1212 struct mount *mp; 1213 struct ucred *cred = p->p_ucred; 1214 int flags; 1215 struct file *nfp; 1216 int type, indx, error=0; 1217 struct flock lf; 1218 struct vattr va; 1219 fhandle_t fh; 1220 1221 /* 1222 * Must be super user 1223 */ 1224 if ((error = suser(p->p_ucred, &p->p_acflag))) 1225 return (error); 1226 1227 flags = FFLAGS(SCARG(uap, flags)); 1228 if ((flags & (FREAD | FWRITE)) == 0) 1229 return (EINVAL); 1230 if ((flags & O_CREAT)) 1231 return (EINVAL); 1232 /* falloc() will use the file descriptor for us */ 1233 if ((error = falloc(p, &nfp, &indx)) != 0) 1234 return (error); 1235 fp = nfp; 1236 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1237 goto bad; 1238 1239 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1240 error = ESTALE; 1241 goto bad; 1242 } 1243 1244 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1245 vp = NULL; /* most likely unnecessary sanity for bad: */ 1246 goto bad; 1247 } 1248 1249 /* Now do an effective vn_open */ 1250 1251 if (vp->v_type == VSOCK) { 1252 error = EOPNOTSUPP; 1253 goto bad; 1254 } 1255 if (flags & FREAD) { 1256 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1257 goto bad; 1258 } 1259 if (flags & (FWRITE | O_TRUNC)) { 1260 if (vp->v_type == VDIR) { 1261 error = EISDIR; 1262 goto bad; 1263 } 1264 if ((error = vn_writechk(vp)) != 0 || 1265 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1266 goto bad; 1267 } 1268 if (flags & O_TRUNC) { 1269 VOP_UNLOCK(vp, 0); /* XXX */ 1270 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1271 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1272 VATTR_NULL(&va); 1273 va.va_size = 0; 1274 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1275 goto bad; 1276 } 1277 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1278 goto bad; 1279 if (vp->v_type == VREG && 1280 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1281 error = EIO; 1282 goto bad; 1283 } 1284 if (flags & FWRITE) 1285 vp->v_writecount++; 1286 1287 /* done with modified vn_open, now finish what sys_open does. */ 1288 1289 fp->f_flag = flags & FMASK; 1290 fp->f_type = DTYPE_VNODE; 1291 fp->f_ops = &vnops; 1292 fp->f_data = vp; 1293 if (flags & (O_EXLOCK | O_SHLOCK)) { 1294 lf.l_whence = SEEK_SET; 1295 lf.l_start = 0; 1296 lf.l_len = 0; 1297 if (flags & O_EXLOCK) 1298 lf.l_type = F_WRLCK; 1299 else 1300 lf.l_type = F_RDLCK; 1301 type = F_FLOCK; 1302 if ((flags & FNONBLOCK) == 0) 1303 type |= F_WAIT; 1304 VOP_UNLOCK(vp, 0); 1305 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1306 if (error) { 1307 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1308 FILE_UNUSE(fp, p); 1309 ffree(fp); 1310 fdremove(fdp, indx); 1311 return (error); 1312 } 1313 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1314 fp->f_flag |= FHASLOCK; 1315 } 1316 VOP_UNLOCK(vp, 0); 1317 *retval = indx; 1318 FILE_SET_MATURE(fp); 1319 FILE_UNUSE(fp, p); 1320 return (0); 1321 1322 bad: 1323 FILE_UNUSE(fp, p); 1324 ffree(fp); 1325 fdremove(fdp, indx); 1326 if (vp != NULL) 1327 vput(vp); 1328 return (error); 1329 } 1330 1331 /* ARGSUSED */ 1332 int 1333 sys_fhstat(l, v, retval) 1334 struct lwp *l; 1335 void *v; 1336 register_t *retval; 1337 { 1338 struct sys_fhstat_args /* { 1339 syscallarg(const fhandle_t *) fhp; 1340 syscallarg(struct stat *) sb; 1341 } */ *uap = v; 1342 struct proc *p = l->l_proc; 1343 struct stat sb; 1344 int error; 1345 fhandle_t fh; 1346 struct mount *mp; 1347 struct vnode *vp; 1348 1349 /* 1350 * Must be super user 1351 */ 1352 if ((error = suser(p->p_ucred, &p->p_acflag))) 1353 return (error); 1354 1355 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1356 return (error); 1357 1358 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1359 return (ESTALE); 1360 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1361 return (error); 1362 error = vn_stat(vp, &sb, p); 1363 vput(vp); 1364 if (error) 1365 return (error); 1366 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1367 return (error); 1368 } 1369 1370 /* ARGSUSED */ 1371 int 1372 sys_fhstatfs(l, v, retval) 1373 struct lwp *l; 1374 void *v; 1375 register_t *retval; 1376 { 1377 struct sys_fhstatfs_args /* 1378 syscallarg(const fhandle_t *) fhp; 1379 syscallarg(struct statfs *) buf; 1380 } */ *uap = v; 1381 struct proc *p = l->l_proc; 1382 struct statfs sbuf; 1383 fhandle_t fh; 1384 struct mount *mp; 1385 struct vnode *vp; 1386 int error; 1387 1388 /* 1389 * Must be super user 1390 */ 1391 if ((error = suser(p->p_ucred, &p->p_acflag))) 1392 return (error); 1393 1394 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1395 return (error); 1396 1397 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1398 return (ESTALE); 1399 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1400 return (error); 1401 mp = vp->v_mount; 1402 vput(vp); 1403 if ((error = VFS_STATFS(mp, &sbuf, p)) != 0) 1404 return (error); 1405 return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf))); 1406 } 1407 1408 /* 1409 * Create a special file. 1410 */ 1411 /* ARGSUSED */ 1412 int 1413 sys_mknod(l, v, retval) 1414 struct lwp *l; 1415 void *v; 1416 register_t *retval; 1417 { 1418 struct sys_mknod_args /* { 1419 syscallarg(const char *) path; 1420 syscallarg(int) mode; 1421 syscallarg(int) dev; 1422 } */ *uap = v; 1423 struct proc *p = l->l_proc; 1424 struct vnode *vp; 1425 struct vattr vattr; 1426 int error; 1427 int whiteout = 0; 1428 struct nameidata nd; 1429 1430 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1431 return (error); 1432 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1433 if ((error = namei(&nd)) != 0) 1434 return (error); 1435 vp = nd.ni_vp; 1436 if (vp != NULL) 1437 error = EEXIST; 1438 else { 1439 VATTR_NULL(&vattr); 1440 vattr.va_mode = 1441 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1442 vattr.va_rdev = SCARG(uap, dev); 1443 whiteout = 0; 1444 1445 switch (SCARG(uap, mode) & S_IFMT) { 1446 case S_IFMT: /* used by badsect to flag bad sectors */ 1447 vattr.va_type = VBAD; 1448 break; 1449 case S_IFCHR: 1450 vattr.va_type = VCHR; 1451 break; 1452 case S_IFBLK: 1453 vattr.va_type = VBLK; 1454 break; 1455 case S_IFWHT: 1456 whiteout = 1; 1457 break; 1458 default: 1459 error = EINVAL; 1460 break; 1461 } 1462 } 1463 if (!error) { 1464 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1465 if (whiteout) { 1466 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1467 if (error) 1468 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1469 vput(nd.ni_dvp); 1470 } else { 1471 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1472 &nd.ni_cnd, &vattr); 1473 if (error == 0) 1474 vput(nd.ni_vp); 1475 } 1476 } else { 1477 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1478 if (nd.ni_dvp == vp) 1479 vrele(nd.ni_dvp); 1480 else 1481 vput(nd.ni_dvp); 1482 if (vp) 1483 vrele(vp); 1484 } 1485 return (error); 1486 } 1487 1488 /* 1489 * Create a named pipe. 1490 */ 1491 /* ARGSUSED */ 1492 int 1493 sys_mkfifo(l, v, retval) 1494 struct lwp *l; 1495 void *v; 1496 register_t *retval; 1497 { 1498 struct sys_mkfifo_args /* { 1499 syscallarg(const char *) path; 1500 syscallarg(int) mode; 1501 } */ *uap = v; 1502 struct proc *p = l->l_proc; 1503 struct vattr vattr; 1504 int error; 1505 struct nameidata nd; 1506 1507 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1508 if ((error = namei(&nd)) != 0) 1509 return (error); 1510 if (nd.ni_vp != NULL) { 1511 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1512 if (nd.ni_dvp == nd.ni_vp) 1513 vrele(nd.ni_dvp); 1514 else 1515 vput(nd.ni_dvp); 1516 vrele(nd.ni_vp); 1517 return (EEXIST); 1518 } 1519 VATTR_NULL(&vattr); 1520 vattr.va_type = VFIFO; 1521 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1522 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1523 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1524 if (error == 0) 1525 vput(nd.ni_vp); 1526 return (error); 1527 } 1528 1529 /* 1530 * Make a hard file link. 1531 */ 1532 /* ARGSUSED */ 1533 int 1534 sys_link(l, v, retval) 1535 struct lwp *l; 1536 void *v; 1537 register_t *retval; 1538 { 1539 struct sys_link_args /* { 1540 syscallarg(const char *) path; 1541 syscallarg(const char *) link; 1542 } */ *uap = v; 1543 struct proc *p = l->l_proc; 1544 struct vnode *vp; 1545 struct nameidata nd; 1546 int error; 1547 1548 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1549 if ((error = namei(&nd)) != 0) 1550 return (error); 1551 vp = nd.ni_vp; 1552 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1553 if ((error = namei(&nd)) != 0) 1554 goto out; 1555 if (nd.ni_vp) { 1556 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1557 if (nd.ni_dvp == nd.ni_vp) 1558 vrele(nd.ni_dvp); 1559 else 1560 vput(nd.ni_dvp); 1561 vrele(nd.ni_vp); 1562 error = EEXIST; 1563 goto out; 1564 } 1565 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1566 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1567 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1568 out: 1569 vrele(vp); 1570 return (error); 1571 } 1572 1573 /* 1574 * Make a symbolic link. 1575 */ 1576 /* ARGSUSED */ 1577 int 1578 sys_symlink(l, v, retval) 1579 struct lwp *l; 1580 void *v; 1581 register_t *retval; 1582 { 1583 struct sys_symlink_args /* { 1584 syscallarg(const char *) path; 1585 syscallarg(const char *) link; 1586 } */ *uap = v; 1587 struct proc *p = l->l_proc; 1588 struct vattr vattr; 1589 char *path; 1590 int error; 1591 struct nameidata nd; 1592 1593 path = PNBUF_GET(); 1594 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1595 if (error) 1596 goto out; 1597 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1598 if ((error = namei(&nd)) != 0) 1599 goto out; 1600 if (nd.ni_vp) { 1601 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1602 if (nd.ni_dvp == nd.ni_vp) 1603 vrele(nd.ni_dvp); 1604 else 1605 vput(nd.ni_dvp); 1606 vrele(nd.ni_vp); 1607 error = EEXIST; 1608 goto out; 1609 } 1610 VATTR_NULL(&vattr); 1611 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1612 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1613 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1614 if (error == 0) 1615 vput(nd.ni_vp); 1616 out: 1617 PNBUF_PUT(path); 1618 return (error); 1619 } 1620 1621 /* 1622 * Delete a whiteout from the filesystem. 1623 */ 1624 /* ARGSUSED */ 1625 int 1626 sys_undelete(l, v, retval) 1627 struct lwp *l; 1628 void *v; 1629 register_t *retval; 1630 { 1631 struct sys_undelete_args /* { 1632 syscallarg(const char *) path; 1633 } */ *uap = v; 1634 struct proc *p = l->l_proc; 1635 int error; 1636 struct nameidata nd; 1637 1638 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1639 SCARG(uap, path), p); 1640 error = namei(&nd); 1641 if (error) 1642 return (error); 1643 1644 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1645 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1646 if (nd.ni_dvp == nd.ni_vp) 1647 vrele(nd.ni_dvp); 1648 else 1649 vput(nd.ni_dvp); 1650 if (nd.ni_vp) 1651 vrele(nd.ni_vp); 1652 return (EEXIST); 1653 } 1654 1655 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1656 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1657 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1658 vput(nd.ni_dvp); 1659 return (error); 1660 } 1661 1662 /* 1663 * Delete a name from the filesystem. 1664 */ 1665 /* ARGSUSED */ 1666 int 1667 sys_unlink(l, v, retval) 1668 struct lwp *l; 1669 void *v; 1670 register_t *retval; 1671 { 1672 struct sys_unlink_args /* { 1673 syscallarg(const char *) path; 1674 } */ *uap = v; 1675 struct proc *p = l->l_proc; 1676 struct vnode *vp; 1677 int error; 1678 struct nameidata nd; 1679 1680 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1681 SCARG(uap, path), p); 1682 if ((error = namei(&nd)) != 0) 1683 return (error); 1684 vp = nd.ni_vp; 1685 1686 /* 1687 * The root of a mounted filesystem cannot be deleted. 1688 */ 1689 if (vp->v_flag & VROOT) { 1690 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1691 if (nd.ni_dvp == vp) 1692 vrele(nd.ni_dvp); 1693 else 1694 vput(nd.ni_dvp); 1695 vput(vp); 1696 error = EBUSY; 1697 goto out; 1698 } 1699 1700 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1701 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1702 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1703 out: 1704 return (error); 1705 } 1706 1707 /* 1708 * Reposition read/write file offset. 1709 */ 1710 int 1711 sys_lseek(l, v, retval) 1712 struct lwp *l; 1713 void *v; 1714 register_t *retval; 1715 { 1716 struct sys_lseek_args /* { 1717 syscallarg(int) fd; 1718 syscallarg(int) pad; 1719 syscallarg(off_t) offset; 1720 syscallarg(int) whence; 1721 } */ *uap = v; 1722 struct proc *p = l->l_proc; 1723 struct ucred *cred = p->p_ucred; 1724 struct filedesc *fdp = p->p_fd; 1725 struct file *fp; 1726 struct vnode *vp; 1727 struct vattr vattr; 1728 off_t newoff; 1729 int error; 1730 1731 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1732 return (EBADF); 1733 1734 FILE_USE(fp); 1735 1736 vp = (struct vnode *)fp->f_data; 1737 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1738 error = ESPIPE; 1739 goto out; 1740 } 1741 1742 switch (SCARG(uap, whence)) { 1743 case SEEK_CUR: 1744 newoff = fp->f_offset + SCARG(uap, offset); 1745 break; 1746 case SEEK_END: 1747 error = VOP_GETATTR(vp, &vattr, cred, p); 1748 if (error) 1749 goto out; 1750 newoff = SCARG(uap, offset) + vattr.va_size; 1751 break; 1752 case SEEK_SET: 1753 newoff = SCARG(uap, offset); 1754 break; 1755 default: 1756 error = EINVAL; 1757 goto out; 1758 } 1759 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1760 goto out; 1761 1762 *(off_t *)retval = fp->f_offset = newoff; 1763 out: 1764 FILE_UNUSE(fp, p); 1765 return (error); 1766 } 1767 1768 /* 1769 * Positional read system call. 1770 */ 1771 int 1772 sys_pread(l, v, retval) 1773 struct lwp *l; 1774 void *v; 1775 register_t *retval; 1776 { 1777 struct sys_pread_args /* { 1778 syscallarg(int) fd; 1779 syscallarg(void *) buf; 1780 syscallarg(size_t) nbyte; 1781 syscallarg(off_t) offset; 1782 } */ *uap = v; 1783 struct proc *p = l->l_proc; 1784 struct filedesc *fdp = p->p_fd; 1785 struct file *fp; 1786 struct vnode *vp; 1787 off_t offset; 1788 int error, fd = SCARG(uap, fd); 1789 1790 if ((fp = fd_getfile(fdp, fd)) == NULL) 1791 return (EBADF); 1792 1793 if ((fp->f_flag & FREAD) == 0) { 1794 simple_unlock(&fp->f_slock); 1795 return (EBADF); 1796 } 1797 1798 FILE_USE(fp); 1799 1800 vp = (struct vnode *)fp->f_data; 1801 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1802 error = ESPIPE; 1803 goto out; 1804 } 1805 1806 offset = SCARG(uap, offset); 1807 1808 /* 1809 * XXX This works because no file systems actually 1810 * XXX take any action on the seek operation. 1811 */ 1812 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1813 goto out; 1814 1815 /* dofileread() will unuse the descriptor for us */ 1816 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1817 &offset, 0, retval)); 1818 1819 out: 1820 FILE_UNUSE(fp, p); 1821 return (error); 1822 } 1823 1824 /* 1825 * Positional scatter read system call. 1826 */ 1827 int 1828 sys_preadv(l, v, retval) 1829 struct lwp *l; 1830 void *v; 1831 register_t *retval; 1832 { 1833 struct sys_preadv_args /* { 1834 syscallarg(int) fd; 1835 syscallarg(const struct iovec *) iovp; 1836 syscallarg(int) iovcnt; 1837 syscallarg(off_t) offset; 1838 } */ *uap = v; 1839 struct proc *p = l->l_proc; 1840 struct filedesc *fdp = p->p_fd; 1841 struct file *fp; 1842 struct vnode *vp; 1843 off_t offset; 1844 int error, fd = SCARG(uap, fd); 1845 1846 if ((fp = fd_getfile(fdp, fd)) == NULL) 1847 return (EBADF); 1848 1849 if ((fp->f_flag & FREAD) == 0) { 1850 simple_unlock(&fp->f_slock); 1851 return (EBADF); 1852 } 1853 1854 FILE_USE(fp); 1855 1856 vp = (struct vnode *)fp->f_data; 1857 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1858 error = ESPIPE; 1859 goto out; 1860 } 1861 1862 offset = SCARG(uap, offset); 1863 1864 /* 1865 * XXX This works because no file systems actually 1866 * XXX take any action on the seek operation. 1867 */ 1868 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1869 goto out; 1870 1871 /* dofilereadv() will unuse the descriptor for us */ 1872 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1873 &offset, 0, retval)); 1874 1875 out: 1876 FILE_UNUSE(fp, p); 1877 return (error); 1878 } 1879 1880 /* 1881 * Positional write system call. 1882 */ 1883 int 1884 sys_pwrite(l, v, retval) 1885 struct lwp *l; 1886 void *v; 1887 register_t *retval; 1888 { 1889 struct sys_pwrite_args /* { 1890 syscallarg(int) fd; 1891 syscallarg(const void *) buf; 1892 syscallarg(size_t) nbyte; 1893 syscallarg(off_t) offset; 1894 } */ *uap = v; 1895 struct proc *p = l->l_proc; 1896 struct filedesc *fdp = p->p_fd; 1897 struct file *fp; 1898 struct vnode *vp; 1899 off_t offset; 1900 int error, fd = SCARG(uap, fd); 1901 1902 if ((fp = fd_getfile(fdp, fd)) == NULL) 1903 return (EBADF); 1904 1905 if ((fp->f_flag & FWRITE) == 0) { 1906 simple_unlock(&fp->f_slock); 1907 return (EBADF); 1908 } 1909 1910 FILE_USE(fp); 1911 1912 vp = (struct vnode *)fp->f_data; 1913 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1914 error = ESPIPE; 1915 goto out; 1916 } 1917 1918 offset = SCARG(uap, offset); 1919 1920 /* 1921 * XXX This works because no file systems actually 1922 * XXX take any action on the seek operation. 1923 */ 1924 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1925 goto out; 1926 1927 /* dofilewrite() will unuse the descriptor for us */ 1928 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1929 &offset, 0, retval)); 1930 1931 out: 1932 FILE_UNUSE(fp, p); 1933 return (error); 1934 } 1935 1936 /* 1937 * Positional gather write system call. 1938 */ 1939 int 1940 sys_pwritev(l, v, retval) 1941 struct lwp *l; 1942 void *v; 1943 register_t *retval; 1944 { 1945 struct sys_pwritev_args /* { 1946 syscallarg(int) fd; 1947 syscallarg(const struct iovec *) iovp; 1948 syscallarg(int) iovcnt; 1949 syscallarg(off_t) offset; 1950 } */ *uap = v; 1951 struct proc *p = l->l_proc; 1952 struct filedesc *fdp = p->p_fd; 1953 struct file *fp; 1954 struct vnode *vp; 1955 off_t offset; 1956 int error, fd = SCARG(uap, fd); 1957 1958 if ((fp = fd_getfile(fdp, fd)) == NULL) 1959 return (EBADF); 1960 1961 if ((fp->f_flag & FWRITE) == 0) { 1962 simple_unlock(&fp->f_slock); 1963 return (EBADF); 1964 } 1965 1966 FILE_USE(fp); 1967 1968 vp = (struct vnode *)fp->f_data; 1969 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1970 error = ESPIPE; 1971 goto out; 1972 } 1973 1974 offset = SCARG(uap, offset); 1975 1976 /* 1977 * XXX This works because no file systems actually 1978 * XXX take any action on the seek operation. 1979 */ 1980 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1981 goto out; 1982 1983 /* dofilewritev() will unuse the descriptor for us */ 1984 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1985 &offset, 0, retval)); 1986 1987 out: 1988 FILE_UNUSE(fp, p); 1989 return (error); 1990 } 1991 1992 /* 1993 * Check access permissions. 1994 */ 1995 int 1996 sys_access(l, v, retval) 1997 struct lwp *l; 1998 void *v; 1999 register_t *retval; 2000 { 2001 struct sys_access_args /* { 2002 syscallarg(const char *) path; 2003 syscallarg(int) flags; 2004 } */ *uap = v; 2005 struct proc *p = l->l_proc; 2006 struct ucred *cred = crget(); 2007 struct vnode *vp; 2008 int error, flags; 2009 struct nameidata nd; 2010 2011 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 2012 cred->cr_ref = 1; 2013 cred->cr_uid = p->p_cred->p_ruid; 2014 cred->cr_gid = p->p_cred->p_rgid; 2015 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2016 SCARG(uap, path), p); 2017 /* Override default credentials */ 2018 nd.ni_cnd.cn_cred = cred; 2019 if ((error = namei(&nd)) != 0) 2020 goto out; 2021 vp = nd.ni_vp; 2022 2023 /* Flags == 0 means only check for existence. */ 2024 if (SCARG(uap, flags)) { 2025 flags = 0; 2026 if (SCARG(uap, flags) & R_OK) 2027 flags |= VREAD; 2028 if (SCARG(uap, flags) & W_OK) 2029 flags |= VWRITE; 2030 if (SCARG(uap, flags) & X_OK) 2031 flags |= VEXEC; 2032 2033 error = VOP_ACCESS(vp, flags, cred, p); 2034 if (!error && (flags & VWRITE)) 2035 error = vn_writechk(vp); 2036 } 2037 vput(vp); 2038 out: 2039 crfree(cred); 2040 return (error); 2041 } 2042 2043 /* 2044 * Get file status; this version follows links. 2045 */ 2046 /* ARGSUSED */ 2047 int 2048 sys___stat13(l, v, retval) 2049 struct lwp *l; 2050 void *v; 2051 register_t *retval; 2052 { 2053 struct sys___stat13_args /* { 2054 syscallarg(const char *) path; 2055 syscallarg(struct stat *) ub; 2056 } */ *uap = v; 2057 struct proc *p = l->l_proc; 2058 struct stat sb; 2059 int error; 2060 struct nameidata nd; 2061 2062 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2063 SCARG(uap, path), p); 2064 if ((error = namei(&nd)) != 0) 2065 return (error); 2066 error = vn_stat(nd.ni_vp, &sb, p); 2067 vput(nd.ni_vp); 2068 if (error) 2069 return (error); 2070 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2071 return (error); 2072 } 2073 2074 /* 2075 * Get file status; this version does not follow links. 2076 */ 2077 /* ARGSUSED */ 2078 int 2079 sys___lstat13(l, v, retval) 2080 struct lwp *l; 2081 void *v; 2082 register_t *retval; 2083 { 2084 struct sys___lstat13_args /* { 2085 syscallarg(const char *) path; 2086 syscallarg(struct stat *) ub; 2087 } */ *uap = v; 2088 struct proc *p = l->l_proc; 2089 struct stat sb; 2090 int error; 2091 struct nameidata nd; 2092 2093 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2094 SCARG(uap, path), p); 2095 if ((error = namei(&nd)) != 0) 2096 return (error); 2097 error = vn_stat(nd.ni_vp, &sb, p); 2098 vput(nd.ni_vp); 2099 if (error) 2100 return (error); 2101 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2102 return (error); 2103 } 2104 2105 /* 2106 * Get configurable pathname variables. 2107 */ 2108 /* ARGSUSED */ 2109 int 2110 sys_pathconf(l, v, retval) 2111 struct lwp *l; 2112 void *v; 2113 register_t *retval; 2114 { 2115 struct sys_pathconf_args /* { 2116 syscallarg(const char *) path; 2117 syscallarg(int) name; 2118 } */ *uap = v; 2119 struct proc *p = l->l_proc; 2120 int error; 2121 struct nameidata nd; 2122 2123 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2124 SCARG(uap, path), p); 2125 if ((error = namei(&nd)) != 0) 2126 return (error); 2127 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2128 vput(nd.ni_vp); 2129 return (error); 2130 } 2131 2132 /* 2133 * Return target name of a symbolic link. 2134 */ 2135 /* ARGSUSED */ 2136 int 2137 sys_readlink(l, v, retval) 2138 struct lwp *l; 2139 void *v; 2140 register_t *retval; 2141 { 2142 struct sys_readlink_args /* { 2143 syscallarg(const char *) path; 2144 syscallarg(char *) buf; 2145 syscallarg(size_t) count; 2146 } */ *uap = v; 2147 struct proc *p = l->l_proc; 2148 struct vnode *vp; 2149 struct iovec aiov; 2150 struct uio auio; 2151 int error; 2152 struct nameidata nd; 2153 2154 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2155 SCARG(uap, path), p); 2156 if ((error = namei(&nd)) != 0) 2157 return (error); 2158 vp = nd.ni_vp; 2159 if (vp->v_type != VLNK) 2160 error = EINVAL; 2161 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2162 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2163 aiov.iov_base = SCARG(uap, buf); 2164 aiov.iov_len = SCARG(uap, count); 2165 auio.uio_iov = &aiov; 2166 auio.uio_iovcnt = 1; 2167 auio.uio_offset = 0; 2168 auio.uio_rw = UIO_READ; 2169 auio.uio_segflg = UIO_USERSPACE; 2170 auio.uio_procp = p; 2171 auio.uio_resid = SCARG(uap, count); 2172 error = VOP_READLINK(vp, &auio, p->p_ucred); 2173 } 2174 vput(vp); 2175 *retval = SCARG(uap, count) - auio.uio_resid; 2176 return (error); 2177 } 2178 2179 /* 2180 * Change flags of a file given a path name. 2181 */ 2182 /* ARGSUSED */ 2183 int 2184 sys_chflags(l, v, retval) 2185 struct lwp *l; 2186 void *v; 2187 register_t *retval; 2188 { 2189 struct sys_chflags_args /* { 2190 syscallarg(const char *) path; 2191 syscallarg(u_long) flags; 2192 } */ *uap = v; 2193 struct proc *p = l->l_proc; 2194 struct vnode *vp; 2195 int error; 2196 struct nameidata nd; 2197 2198 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2199 if ((error = namei(&nd)) != 0) 2200 return (error); 2201 vp = nd.ni_vp; 2202 error = change_flags(vp, SCARG(uap, flags), p); 2203 vput(vp); 2204 return (error); 2205 } 2206 2207 /* 2208 * Change flags of a file given a file descriptor. 2209 */ 2210 /* ARGSUSED */ 2211 int 2212 sys_fchflags(l, v, retval) 2213 struct lwp *l; 2214 void *v; 2215 register_t *retval; 2216 { 2217 struct sys_fchflags_args /* { 2218 syscallarg(int) fd; 2219 syscallarg(u_long) flags; 2220 } */ *uap = v; 2221 struct proc *p = l->l_proc; 2222 struct vnode *vp; 2223 struct file *fp; 2224 int error; 2225 2226 /* getvnode() will use the descriptor for us */ 2227 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2228 return (error); 2229 vp = (struct vnode *)fp->f_data; 2230 error = change_flags(vp, SCARG(uap, flags), p); 2231 VOP_UNLOCK(vp, 0); 2232 FILE_UNUSE(fp, p); 2233 return (error); 2234 } 2235 2236 /* 2237 * Change flags of a file given a path name; this version does 2238 * not follow links. 2239 */ 2240 int 2241 sys_lchflags(l, v, retval) 2242 struct lwp *l; 2243 void *v; 2244 register_t *retval; 2245 { 2246 struct sys_lchflags_args /* { 2247 syscallarg(const char *) path; 2248 syscallarg(u_long) flags; 2249 } */ *uap = v; 2250 struct proc *p = l->l_proc; 2251 struct vnode *vp; 2252 int error; 2253 struct nameidata nd; 2254 2255 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2256 if ((error = namei(&nd)) != 0) 2257 return (error); 2258 vp = nd.ni_vp; 2259 error = change_flags(vp, SCARG(uap, flags), p); 2260 vput(vp); 2261 return (error); 2262 } 2263 2264 /* 2265 * Common routine to change flags of a file. 2266 */ 2267 int 2268 change_flags(vp, flags, p) 2269 struct vnode *vp; 2270 u_long flags; 2271 struct proc *p; 2272 { 2273 struct vattr vattr; 2274 int error; 2275 2276 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2277 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2278 /* 2279 * Non-superusers cannot change the flags on devices, even if they 2280 * own them. 2281 */ 2282 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2283 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2284 goto out; 2285 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2286 error = EINVAL; 2287 goto out; 2288 } 2289 } 2290 VATTR_NULL(&vattr); 2291 vattr.va_flags = flags; 2292 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2293 out: 2294 return (error); 2295 } 2296 2297 /* 2298 * Change mode of a file given path name; this version follows links. 2299 */ 2300 /* ARGSUSED */ 2301 int 2302 sys_chmod(l, v, retval) 2303 struct lwp *l; 2304 void *v; 2305 register_t *retval; 2306 { 2307 struct sys_chmod_args /* { 2308 syscallarg(const char *) path; 2309 syscallarg(int) mode; 2310 } */ *uap = v; 2311 struct proc *p = l->l_proc; 2312 int error; 2313 struct nameidata nd; 2314 2315 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2316 if ((error = namei(&nd)) != 0) 2317 return (error); 2318 2319 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2320 2321 vrele(nd.ni_vp); 2322 return (error); 2323 } 2324 2325 /* 2326 * Change mode of a file given a file descriptor. 2327 */ 2328 /* ARGSUSED */ 2329 int 2330 sys_fchmod(l, v, retval) 2331 struct lwp *l; 2332 void *v; 2333 register_t *retval; 2334 { 2335 struct sys_fchmod_args /* { 2336 syscallarg(int) fd; 2337 syscallarg(int) mode; 2338 } */ *uap = v; 2339 struct proc *p = l->l_proc; 2340 struct file *fp; 2341 int error; 2342 2343 /* getvnode() will use the descriptor for us */ 2344 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2345 return (error); 2346 2347 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2348 FILE_UNUSE(fp, p); 2349 return (error); 2350 } 2351 2352 /* 2353 * Change mode of a file given path name; this version does not follow links. 2354 */ 2355 /* ARGSUSED */ 2356 int 2357 sys_lchmod(l, v, retval) 2358 struct lwp *l; 2359 void *v; 2360 register_t *retval; 2361 { 2362 struct sys_lchmod_args /* { 2363 syscallarg(const char *) path; 2364 syscallarg(int) mode; 2365 } */ *uap = v; 2366 struct proc *p = l->l_proc; 2367 int error; 2368 struct nameidata nd; 2369 2370 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2371 if ((error = namei(&nd)) != 0) 2372 return (error); 2373 2374 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2375 2376 vrele(nd.ni_vp); 2377 return (error); 2378 } 2379 2380 /* 2381 * Common routine to set mode given a vnode. 2382 */ 2383 static int 2384 change_mode(vp, mode, p) 2385 struct vnode *vp; 2386 int mode; 2387 struct proc *p; 2388 { 2389 struct vattr vattr; 2390 int error; 2391 2392 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2393 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2394 VATTR_NULL(&vattr); 2395 vattr.va_mode = mode & ALLPERMS; 2396 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2397 VOP_UNLOCK(vp, 0); 2398 return (error); 2399 } 2400 2401 /* 2402 * Set ownership given a path name; this version follows links. 2403 */ 2404 /* ARGSUSED */ 2405 int 2406 sys_chown(l, v, retval) 2407 struct lwp *l; 2408 void *v; 2409 register_t *retval; 2410 { 2411 struct sys_chown_args /* { 2412 syscallarg(const char *) path; 2413 syscallarg(uid_t) uid; 2414 syscallarg(gid_t) gid; 2415 } */ *uap = v; 2416 struct proc *p = l->l_proc; 2417 int error; 2418 struct nameidata nd; 2419 2420 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2421 if ((error = namei(&nd)) != 0) 2422 return (error); 2423 2424 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2425 2426 vrele(nd.ni_vp); 2427 return (error); 2428 } 2429 2430 /* 2431 * Set ownership given a path name; this version follows links. 2432 * Provides POSIX semantics. 2433 */ 2434 /* ARGSUSED */ 2435 int 2436 sys___posix_chown(l, v, retval) 2437 struct lwp *l; 2438 void *v; 2439 register_t *retval; 2440 { 2441 struct sys_chown_args /* { 2442 syscallarg(const char *) path; 2443 syscallarg(uid_t) uid; 2444 syscallarg(gid_t) gid; 2445 } */ *uap = v; 2446 struct proc *p = l->l_proc; 2447 int error; 2448 struct nameidata nd; 2449 2450 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2451 if ((error = namei(&nd)) != 0) 2452 return (error); 2453 2454 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2455 2456 vrele(nd.ni_vp); 2457 return (error); 2458 } 2459 2460 /* 2461 * Set ownership given a file descriptor. 2462 */ 2463 /* ARGSUSED */ 2464 int 2465 sys_fchown(l, v, retval) 2466 struct lwp *l; 2467 void *v; 2468 register_t *retval; 2469 { 2470 struct sys_fchown_args /* { 2471 syscallarg(int) fd; 2472 syscallarg(uid_t) uid; 2473 syscallarg(gid_t) gid; 2474 } */ *uap = v; 2475 struct proc *p = l->l_proc; 2476 int error; 2477 struct file *fp; 2478 2479 /* getvnode() will use the descriptor for us */ 2480 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2481 return (error); 2482 2483 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2484 SCARG(uap, gid), p, 0); 2485 FILE_UNUSE(fp, p); 2486 return (error); 2487 } 2488 2489 /* 2490 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2491 */ 2492 /* ARGSUSED */ 2493 int 2494 sys___posix_fchown(l, v, retval) 2495 struct lwp *l; 2496 void *v; 2497 register_t *retval; 2498 { 2499 struct sys_fchown_args /* { 2500 syscallarg(int) fd; 2501 syscallarg(uid_t) uid; 2502 syscallarg(gid_t) gid; 2503 } */ *uap = v; 2504 struct proc *p = l->l_proc; 2505 int error; 2506 struct file *fp; 2507 2508 /* getvnode() will use the descriptor for us */ 2509 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2510 return (error); 2511 2512 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2513 SCARG(uap, gid), p, 1); 2514 FILE_UNUSE(fp, p); 2515 return (error); 2516 } 2517 2518 /* 2519 * Set ownership given a path name; this version does not follow links. 2520 */ 2521 /* ARGSUSED */ 2522 int 2523 sys_lchown(l, v, retval) 2524 struct lwp *l; 2525 void *v; 2526 register_t *retval; 2527 { 2528 struct sys_lchown_args /* { 2529 syscallarg(const char *) path; 2530 syscallarg(uid_t) uid; 2531 syscallarg(gid_t) gid; 2532 } */ *uap = v; 2533 struct proc *p = l->l_proc; 2534 int error; 2535 struct nameidata nd; 2536 2537 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2538 if ((error = namei(&nd)) != 0) 2539 return (error); 2540 2541 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2542 2543 vrele(nd.ni_vp); 2544 return (error); 2545 } 2546 2547 /* 2548 * Set ownership given a path name; this version does not follow links. 2549 * Provides POSIX/XPG semantics. 2550 */ 2551 /* ARGSUSED */ 2552 int 2553 sys___posix_lchown(l, v, retval) 2554 struct lwp *l; 2555 void *v; 2556 register_t *retval; 2557 { 2558 struct sys_lchown_args /* { 2559 syscallarg(const char *) path; 2560 syscallarg(uid_t) uid; 2561 syscallarg(gid_t) gid; 2562 } */ *uap = v; 2563 struct proc *p = l->l_proc; 2564 int error; 2565 struct nameidata nd; 2566 2567 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2568 if ((error = namei(&nd)) != 0) 2569 return (error); 2570 2571 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2572 2573 vrele(nd.ni_vp); 2574 return (error); 2575 } 2576 2577 /* 2578 * Common routine to set ownership given a vnode. 2579 */ 2580 static int 2581 change_owner(vp, uid, gid, p, posix_semantics) 2582 struct vnode *vp; 2583 uid_t uid; 2584 gid_t gid; 2585 struct proc *p; 2586 int posix_semantics; 2587 { 2588 struct vattr vattr; 2589 mode_t newmode; 2590 int error; 2591 2592 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2593 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2594 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2595 goto out; 2596 2597 #define CHANGED(x) ((int)(x) != -1) 2598 newmode = vattr.va_mode; 2599 if (posix_semantics) { 2600 /* 2601 * POSIX/XPG semantics: if the caller is not the super-user, 2602 * clear set-user-id and set-group-id bits. Both POSIX and 2603 * the XPG consider the behaviour for calls by the super-user 2604 * implementation-defined; we leave the set-user-id and set- 2605 * group-id settings intact in that case. 2606 */ 2607 if (suser(p->p_ucred, NULL) != 0) 2608 newmode &= ~(S_ISUID | S_ISGID); 2609 } else { 2610 /* 2611 * NetBSD semantics: when changing owner and/or group, 2612 * clear the respective bit(s). 2613 */ 2614 if (CHANGED(uid)) 2615 newmode &= ~S_ISUID; 2616 if (CHANGED(gid)) 2617 newmode &= ~S_ISGID; 2618 } 2619 /* Update va_mode iff altered. */ 2620 if (vattr.va_mode == newmode) 2621 newmode = VNOVAL; 2622 2623 VATTR_NULL(&vattr); 2624 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2625 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2626 vattr.va_mode = newmode; 2627 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2628 #undef CHANGED 2629 2630 out: 2631 VOP_UNLOCK(vp, 0); 2632 return (error); 2633 } 2634 2635 /* 2636 * Set the access and modification times given a path name; this 2637 * version follows links. 2638 */ 2639 /* ARGSUSED */ 2640 int 2641 sys_utimes(l, v, retval) 2642 struct lwp *l; 2643 void *v; 2644 register_t *retval; 2645 { 2646 struct sys_utimes_args /* { 2647 syscallarg(const char *) path; 2648 syscallarg(const struct timeval *) tptr; 2649 } */ *uap = v; 2650 struct proc *p = l->l_proc; 2651 int error; 2652 struct nameidata nd; 2653 2654 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2655 if ((error = namei(&nd)) != 0) 2656 return (error); 2657 2658 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2659 2660 vrele(nd.ni_vp); 2661 return (error); 2662 } 2663 2664 /* 2665 * Set the access and modification times given a file descriptor. 2666 */ 2667 /* ARGSUSED */ 2668 int 2669 sys_futimes(l, v, retval) 2670 struct lwp *l; 2671 void *v; 2672 register_t *retval; 2673 { 2674 struct sys_futimes_args /* { 2675 syscallarg(int) fd; 2676 syscallarg(const struct timeval *) tptr; 2677 } */ *uap = v; 2678 struct proc *p = l->l_proc; 2679 int error; 2680 struct file *fp; 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 2686 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2687 FILE_UNUSE(fp, p); 2688 return (error); 2689 } 2690 2691 /* 2692 * Set the access and modification times given a path name; this 2693 * version does not follow links. 2694 */ 2695 /* ARGSUSED */ 2696 int 2697 sys_lutimes(l, v, retval) 2698 struct lwp *l; 2699 void *v; 2700 register_t *retval; 2701 { 2702 struct sys_lutimes_args /* { 2703 syscallarg(const char *) path; 2704 syscallarg(const struct timeval *) tptr; 2705 } */ *uap = v; 2706 struct proc *p = l->l_proc; 2707 int error; 2708 struct nameidata nd; 2709 2710 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2711 if ((error = namei(&nd)) != 0) 2712 return (error); 2713 2714 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2715 2716 vrele(nd.ni_vp); 2717 return (error); 2718 } 2719 2720 /* 2721 * Common routine to set access and modification times given a vnode. 2722 */ 2723 static int 2724 change_utimes(vp, tptr, p) 2725 struct vnode *vp; 2726 const struct timeval *tptr; 2727 struct proc *p; 2728 { 2729 struct timeval tv[2]; 2730 struct vattr vattr; 2731 int error; 2732 2733 VATTR_NULL(&vattr); 2734 if (tptr == NULL) { 2735 microtime(&tv[0]); 2736 tv[1] = tv[0]; 2737 vattr.va_vaflags |= VA_UTIMES_NULL; 2738 } else { 2739 error = copyin(tptr, tv, sizeof(tv)); 2740 if (error) 2741 return (error); 2742 } 2743 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2744 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2745 vattr.va_atime.tv_sec = tv[0].tv_sec; 2746 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2747 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2748 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2749 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2750 VOP_UNLOCK(vp, 0); 2751 return (error); 2752 } 2753 2754 /* 2755 * Truncate a file given its path name. 2756 */ 2757 /* ARGSUSED */ 2758 int 2759 sys_truncate(l, v, retval) 2760 struct lwp *l; 2761 void *v; 2762 register_t *retval; 2763 { 2764 struct sys_truncate_args /* { 2765 syscallarg(const char *) path; 2766 syscallarg(int) pad; 2767 syscallarg(off_t) length; 2768 } */ *uap = v; 2769 struct proc *p = l->l_proc; 2770 struct vnode *vp; 2771 struct vattr vattr; 2772 int error; 2773 struct nameidata nd; 2774 2775 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2776 if ((error = namei(&nd)) != 0) 2777 return (error); 2778 vp = nd.ni_vp; 2779 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2780 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2781 if (vp->v_type == VDIR) 2782 error = EISDIR; 2783 else if ((error = vn_writechk(vp)) == 0 && 2784 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2785 VATTR_NULL(&vattr); 2786 vattr.va_size = SCARG(uap, length); 2787 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2788 } 2789 vput(vp); 2790 return (error); 2791 } 2792 2793 /* 2794 * Truncate a file given a file descriptor. 2795 */ 2796 /* ARGSUSED */ 2797 int 2798 sys_ftruncate(l, v, retval) 2799 struct lwp *l; 2800 void *v; 2801 register_t *retval; 2802 { 2803 struct sys_ftruncate_args /* { 2804 syscallarg(int) fd; 2805 syscallarg(int) pad; 2806 syscallarg(off_t) length; 2807 } */ *uap = v; 2808 struct proc *p = l->l_proc; 2809 struct vattr vattr; 2810 struct vnode *vp; 2811 struct file *fp; 2812 int error; 2813 2814 /* getvnode() will use the descriptor for us */ 2815 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2816 return (error); 2817 if ((fp->f_flag & FWRITE) == 0) { 2818 error = EINVAL; 2819 goto out; 2820 } 2821 vp = (struct vnode *)fp->f_data; 2822 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2823 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2824 if (vp->v_type == VDIR) 2825 error = EISDIR; 2826 else if ((error = vn_writechk(vp)) == 0) { 2827 VATTR_NULL(&vattr); 2828 vattr.va_size = SCARG(uap, length); 2829 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2830 } 2831 VOP_UNLOCK(vp, 0); 2832 out: 2833 FILE_UNUSE(fp, p); 2834 return (error); 2835 } 2836 2837 /* 2838 * Sync an open file. 2839 */ 2840 /* ARGSUSED */ 2841 int 2842 sys_fsync(l, v, retval) 2843 struct lwp *l; 2844 void *v; 2845 register_t *retval; 2846 { 2847 struct sys_fsync_args /* { 2848 syscallarg(int) fd; 2849 } */ *uap = v; 2850 struct proc *p = l->l_proc; 2851 struct vnode *vp; 2852 struct file *fp; 2853 int error; 2854 2855 /* getvnode() will use the descriptor for us */ 2856 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2857 return (error); 2858 vp = (struct vnode *)fp->f_data; 2859 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2860 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2861 if (error == 0 && bioops.io_fsync != NULL && 2862 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2863 (*bioops.io_fsync)(vp); 2864 VOP_UNLOCK(vp, 0); 2865 FILE_UNUSE(fp, p); 2866 return (error); 2867 } 2868 2869 /* 2870 * Sync the data of an open file. 2871 */ 2872 /* ARGSUSED */ 2873 int 2874 sys_fdatasync(l, v, retval) 2875 struct lwp *l; 2876 void *v; 2877 register_t *retval; 2878 { 2879 struct sys_fdatasync_args /* { 2880 syscallarg(int) fd; 2881 } */ *uap = v; 2882 struct proc *p = l->l_proc; 2883 struct vnode *vp; 2884 struct file *fp; 2885 int error; 2886 2887 /* getvnode() will use the descriptor for us */ 2888 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2889 return (error); 2890 vp = (struct vnode *)fp->f_data; 2891 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2892 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2893 VOP_UNLOCK(vp, 0); 2894 FILE_UNUSE(fp, p); 2895 return (error); 2896 } 2897 2898 /* 2899 * Rename files, (standard) BSD semantics frontend. 2900 */ 2901 /* ARGSUSED */ 2902 int 2903 sys_rename(l, v, retval) 2904 struct lwp *l; 2905 void *v; 2906 register_t *retval; 2907 { 2908 struct sys_rename_args /* { 2909 syscallarg(const char *) from; 2910 syscallarg(const char *) to; 2911 } */ *uap = v; 2912 struct proc *p = l->l_proc; 2913 2914 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2915 } 2916 2917 /* 2918 * Rename files, POSIX semantics frontend. 2919 */ 2920 /* ARGSUSED */ 2921 int 2922 sys___posix_rename(l, v, retval) 2923 struct lwp *l; 2924 void *v; 2925 register_t *retval; 2926 { 2927 struct sys___posix_rename_args /* { 2928 syscallarg(const char *) from; 2929 syscallarg(const char *) to; 2930 } */ *uap = v; 2931 struct proc *p = l->l_proc; 2932 2933 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2934 } 2935 2936 /* 2937 * Rename files. Source and destination must either both be directories, 2938 * or both not be directories. If target is a directory, it must be empty. 2939 * If `from' and `to' refer to the same object, the value of the `retain' 2940 * argument is used to determine whether `from' will be 2941 * 2942 * (retain == 0) deleted unless `from' and `to' refer to the same 2943 * object in the file system's name space (BSD). 2944 * (retain == 1) always retained (POSIX). 2945 */ 2946 static int 2947 rename_files(from, to, p, retain) 2948 const char *from, *to; 2949 struct proc *p; 2950 int retain; 2951 { 2952 struct vnode *tvp, *fvp, *tdvp; 2953 struct nameidata fromnd, tond; 2954 int error; 2955 2956 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2957 from, p); 2958 if ((error = namei(&fromnd)) != 0) 2959 return (error); 2960 fvp = fromnd.ni_vp; 2961 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2962 UIO_USERSPACE, to, p); 2963 if ((error = namei(&tond)) != 0) { 2964 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2965 vrele(fromnd.ni_dvp); 2966 vrele(fvp); 2967 goto out1; 2968 } 2969 tdvp = tond.ni_dvp; 2970 tvp = tond.ni_vp; 2971 2972 if (tvp != NULL) { 2973 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2974 error = ENOTDIR; 2975 goto out; 2976 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2977 error = EISDIR; 2978 goto out; 2979 } 2980 } 2981 2982 if (fvp == tdvp) 2983 error = EINVAL; 2984 2985 /* 2986 * Source and destination refer to the same object. 2987 */ 2988 if (fvp == tvp) { 2989 if (retain) 2990 error = -1; 2991 else if (fromnd.ni_dvp == tdvp && 2992 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2993 !memcmp(fromnd.ni_cnd.cn_nameptr, 2994 tond.ni_cnd.cn_nameptr, 2995 fromnd.ni_cnd.cn_namelen)) 2996 error = -1; 2997 } 2998 2999 out: 3000 if (!error) { 3001 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 3002 if (fromnd.ni_dvp != tdvp) 3003 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3004 if (tvp) { 3005 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3006 } 3007 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3008 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3009 } else { 3010 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3011 if (tdvp == tvp) 3012 vrele(tdvp); 3013 else 3014 vput(tdvp); 3015 if (tvp) 3016 vput(tvp); 3017 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3018 vrele(fromnd.ni_dvp); 3019 vrele(fvp); 3020 } 3021 vrele(tond.ni_startdir); 3022 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3023 out1: 3024 if (fromnd.ni_startdir) 3025 vrele(fromnd.ni_startdir); 3026 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3027 return (error == -1 ? 0 : error); 3028 } 3029 3030 /* 3031 * Make a directory file. 3032 */ 3033 /* ARGSUSED */ 3034 int 3035 sys_mkdir(l, v, retval) 3036 struct lwp *l; 3037 void *v; 3038 register_t *retval; 3039 { 3040 struct sys_mkdir_args /* { 3041 syscallarg(const char *) path; 3042 syscallarg(int) mode; 3043 } */ *uap = v; 3044 struct proc *p = l->l_proc; 3045 struct vnode *vp; 3046 struct vattr vattr; 3047 int error; 3048 struct nameidata nd; 3049 3050 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 3051 if ((error = namei(&nd)) != 0) 3052 return (error); 3053 vp = nd.ni_vp; 3054 if (vp != NULL) { 3055 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3056 if (nd.ni_dvp == vp) 3057 vrele(nd.ni_dvp); 3058 else 3059 vput(nd.ni_dvp); 3060 vrele(vp); 3061 return (EEXIST); 3062 } 3063 VATTR_NULL(&vattr); 3064 vattr.va_type = VDIR; 3065 vattr.va_mode = 3066 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3067 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3068 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3069 if (!error) 3070 vput(nd.ni_vp); 3071 return (error); 3072 } 3073 3074 /* 3075 * Remove a directory file. 3076 */ 3077 /* ARGSUSED */ 3078 int 3079 sys_rmdir(l, v, retval) 3080 struct lwp *l; 3081 void *v; 3082 register_t *retval; 3083 { 3084 struct sys_rmdir_args /* { 3085 syscallarg(const char *) path; 3086 } */ *uap = v; 3087 struct proc *p = l->l_proc; 3088 struct vnode *vp; 3089 int error; 3090 struct nameidata nd; 3091 3092 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3093 SCARG(uap, path), p); 3094 if ((error = namei(&nd)) != 0) 3095 return (error); 3096 vp = nd.ni_vp; 3097 if (vp->v_type != VDIR) { 3098 error = ENOTDIR; 3099 goto out; 3100 } 3101 /* 3102 * No rmdir "." please. 3103 */ 3104 if (nd.ni_dvp == vp) { 3105 error = EINVAL; 3106 goto out; 3107 } 3108 /* 3109 * The root of a mounted filesystem cannot be deleted. 3110 */ 3111 if (vp->v_flag & VROOT) 3112 error = EBUSY; 3113 out: 3114 if (!error) { 3115 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3116 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3117 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3118 } else { 3119 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3120 if (nd.ni_dvp == vp) 3121 vrele(nd.ni_dvp); 3122 else 3123 vput(nd.ni_dvp); 3124 vput(vp); 3125 } 3126 return (error); 3127 } 3128 3129 /* 3130 * Read a block of directory entries in a file system independent format. 3131 */ 3132 int 3133 sys_getdents(l, v, retval) 3134 struct lwp *l; 3135 void *v; 3136 register_t *retval; 3137 { 3138 struct sys_getdents_args /* { 3139 syscallarg(int) fd; 3140 syscallarg(char *) buf; 3141 syscallarg(size_t) count; 3142 } */ *uap = v; 3143 struct proc *p = l->l_proc; 3144 struct file *fp; 3145 int error, done; 3146 3147 /* getvnode() will use the descriptor for us */ 3148 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3149 return (error); 3150 if ((fp->f_flag & FREAD) == 0) { 3151 error = EBADF; 3152 goto out; 3153 } 3154 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3155 SCARG(uap, count), &done, p, 0, 0); 3156 *retval = done; 3157 out: 3158 FILE_UNUSE(fp, p); 3159 return (error); 3160 } 3161 3162 /* 3163 * Set the mode mask for creation of filesystem nodes. 3164 */ 3165 int 3166 sys_umask(l, v, retval) 3167 struct lwp *l; 3168 void *v; 3169 register_t *retval; 3170 { 3171 struct sys_umask_args /* { 3172 syscallarg(mode_t) newmask; 3173 } */ *uap = v; 3174 struct proc *p = l->l_proc; 3175 struct cwdinfo *cwdi; 3176 3177 cwdi = p->p_cwdi; 3178 *retval = cwdi->cwdi_cmask; 3179 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3180 return (0); 3181 } 3182 3183 /* 3184 * Void all references to file by ripping underlying filesystem 3185 * away from vnode. 3186 */ 3187 /* ARGSUSED */ 3188 int 3189 sys_revoke(l, v, retval) 3190 struct lwp *l; 3191 void *v; 3192 register_t *retval; 3193 { 3194 struct sys_revoke_args /* { 3195 syscallarg(const char *) path; 3196 } */ *uap = v; 3197 struct proc *p = l->l_proc; 3198 struct vnode *vp; 3199 struct vattr vattr; 3200 int error; 3201 struct nameidata nd; 3202 3203 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3204 if ((error = namei(&nd)) != 0) 3205 return (error); 3206 vp = nd.ni_vp; 3207 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3208 goto out; 3209 if (p->p_ucred->cr_uid != vattr.va_uid && 3210 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3211 goto out; 3212 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3213 VOP_REVOKE(vp, REVOKEALL); 3214 out: 3215 vrele(vp); 3216 return (error); 3217 } 3218 3219 /* 3220 * Convert a user file descriptor to a kernel file entry. 3221 */ 3222 int 3223 getvnode(fdp, fd, fpp) 3224 struct filedesc *fdp; 3225 int fd; 3226 struct file **fpp; 3227 { 3228 struct vnode *vp; 3229 struct file *fp; 3230 3231 if ((fp = fd_getfile(fdp, fd)) == NULL) 3232 return (EBADF); 3233 3234 FILE_USE(fp); 3235 3236 if (fp->f_type != DTYPE_VNODE) { 3237 FILE_UNUSE(fp, NULL); 3238 return (EINVAL); 3239 } 3240 3241 vp = (struct vnode *)fp->f_data; 3242 if (vp->v_type == VBAD) { 3243 FILE_UNUSE(fp, NULL); 3244 return (EBADF); 3245 } 3246 3247 *fpp = fp; 3248 return (0); 3249 } 3250