vfs_syscalls.c revision 1.164.2.2
1 /* $NetBSD: vfs_syscalls.c,v 1.164.2.2 2001/06/21 20:07:11 nathanw 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/lwp.h> 56 #include <sys/proc.h> 57 #include <sys/uio.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 #include <sys/syscallargs.h> 61 62 #include <miscfs/genfs/genfs.h> 63 #include <miscfs/syncfs/syncfs.h> 64 65 #include <uvm/uvm_extern.h> 66 67 #include <sys/sysctl.h> 68 69 static int change_dir __P((struct nameidata *, struct proc *)); 70 static int change_flags __P((struct vnode *, u_long, struct proc *)); 71 static int change_mode __P((struct vnode *, int, struct proc *p)); 72 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 73 int)); 74 static int change_utimes __P((struct vnode *vp, const struct timeval *, 75 struct proc *p)); 76 static int rename_files __P((const char *, const char *, struct proc *, int)); 77 78 void checkdirs __P((struct vnode *)); 79 80 int dovfsusermount = 0; 81 82 /* 83 * Virtual File System System Calls 84 */ 85 86 /* 87 * Mount a file system. 88 */ 89 90 /* 91 * This table is used to maintain compatibility with 4.3BSD 92 * and NetBSD 0.9 mount syscalls. Note, the order is important! 93 * 94 * Also note that not all of these had actual numbers in 4.3BSD 95 * or NetBSD 0.9! 96 */ 97 const char *mountcompatnames[] = { 98 NULL, /* 0 = MOUNT_NONE */ 99 MOUNT_FFS, /* 1 */ 100 MOUNT_NFS, /* 2 */ 101 MOUNT_MFS, /* 3 */ 102 MOUNT_MSDOS, /* 4 */ 103 MOUNT_LFS, /* 5 */ 104 NULL, /* 6 = MOUNT_LOFS */ 105 MOUNT_FDESC, /* 7 */ 106 MOUNT_PORTAL, /* 8 */ 107 MOUNT_NULL, /* 9 */ 108 MOUNT_UMAP, /* 10 */ 109 MOUNT_KERNFS, /* 11 */ 110 MOUNT_PROCFS, /* 12 */ 111 MOUNT_AFS, /* 13 */ 112 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 113 MOUNT_UNION, /* 15 */ 114 MOUNT_ADOSFS, /* 16 */ 115 MOUNT_EXT2FS, /* 17 */ 116 MOUNT_CODA, /* 18 */ 117 MOUNT_FILECORE, /* 19 */ 118 MOUNT_NTFS, /* 20 */ 119 }; 120 const int nmountcompatnames = sizeof(mountcompatnames) / 121 sizeof(mountcompatnames[0]); 122 123 /* ARGSUSED */ 124 int 125 sys_mount(l, v, retval) 126 struct lwp *l; 127 void *v; 128 register_t *retval; 129 { 130 struct sys_mount_args /* { 131 syscallarg(const char *) type; 132 syscallarg(const char *) path; 133 syscallarg(int) flags; 134 syscallarg(void *) data; 135 } */ *uap = v; 136 struct proc *p = l->l_proc; 137 struct vnode *vp; 138 struct mount *mp; 139 int error, flag = 0; 140 char fstypename[MFSNAMELEN]; 141 struct vattr va; 142 struct nameidata nd; 143 struct vfsops *vfs; 144 145 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 146 return (error); 147 /* 148 * Get vnode to be covered 149 */ 150 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 151 SCARG(uap, path), p); 152 if ((error = namei(&nd)) != 0) 153 return (error); 154 vp = nd.ni_vp; 155 /* 156 * A lookup in VFS_MOUNT might result in an attempt to 157 * lock this vnode again, so make the lock resursive. 158 */ 159 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 160 if (SCARG(uap, flags) & MNT_UPDATE) { 161 if ((vp->v_flag & VROOT) == 0) { 162 vput(vp); 163 return (EINVAL); 164 } 165 mp = vp->v_mount; 166 flag = mp->mnt_flag; 167 vfs = mp->mnt_op; 168 /* 169 * We only allow the filesystem to be reloaded if it 170 * is currently mounted read-only. 171 */ 172 if ((SCARG(uap, flags) & MNT_RELOAD) && 173 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 174 vput(vp); 175 return (EOPNOTSUPP); /* Needs translation */ 176 } 177 /* 178 * In "highly secure" mode, don't let the caller do anything 179 * but downgrade a filesystem from read-write to read-only. 180 * (see also below; MNT_UPDATE is required.) 181 */ 182 if (securelevel >= 2 && 183 (SCARG(uap, flags) != 184 (mp->mnt_flag | MNT_RDONLY | 185 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 186 vput(vp); 187 return (EPERM); 188 } 189 mp->mnt_flag |= 190 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 191 /* 192 * Only root, or the user that did the original mount is 193 * permitted to update it. 194 */ 195 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 196 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 197 vput(vp); 198 return (error); 199 } 200 /* 201 * Do not allow NFS export by non-root users. For non-root 202 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 203 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 204 */ 205 if (p->p_ucred->cr_uid != 0) { 206 if (SCARG(uap, flags) & MNT_EXPORTED) { 207 vput(vp); 208 return (EPERM); 209 } 210 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 211 if (flag & MNT_NOEXEC) 212 SCARG(uap, flags) |= MNT_NOEXEC; 213 } 214 if (vfs_busy(mp, LK_NOWAIT, 0)) { 215 vput(vp); 216 return (EPERM); 217 } 218 VOP_UNLOCK(vp, 0); 219 goto update; 220 } else { 221 if (securelevel >= 2) { 222 vput(vp); 223 return (EPERM); 224 } 225 } 226 /* 227 * If the user is not root, ensure that they own the directory 228 * onto which we are attempting to mount. 229 */ 230 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 231 (va.va_uid != p->p_ucred->cr_uid && 232 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 233 vput(vp); 234 return (error); 235 } 236 /* 237 * Do not allow NFS export by non-root users. For non-root users, 238 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 239 * mount point is already MNT_NOEXEC. 240 */ 241 if (p->p_ucred->cr_uid != 0) { 242 if (SCARG(uap, flags) & MNT_EXPORTED) { 243 vput(vp); 244 return (EPERM); 245 } 246 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 247 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 248 SCARG(uap, flags) |= MNT_NOEXEC; 249 } 250 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 251 return (error); 252 if (vp->v_type != VDIR) { 253 vput(vp); 254 return (ENOTDIR); 255 } 256 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 257 if (error) { 258 #if defined(COMPAT_09) || defined(COMPAT_43) 259 /* 260 * Historically filesystem types were identified by number. 261 * If we get an integer for the filesystem type instead of a 262 * string, we check to see if it matches one of the historic 263 * filesystem types. 264 */ 265 u_long fsindex = (u_long)SCARG(uap, type); 266 if (fsindex >= nmountcompatnames || 267 mountcompatnames[fsindex] == NULL) { 268 vput(vp); 269 return (ENODEV); 270 } 271 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 272 #else 273 vput(vp); 274 return (error); 275 #endif 276 } 277 #ifdef COMPAT_10 278 /* Accept `ufs' as an alias for `ffs'. */ 279 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 280 strncpy(fstypename, "ffs", MFSNAMELEN); 281 #endif 282 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 283 vput(vp); 284 return (ENODEV); 285 } 286 if (vp->v_mountedhere != NULL) { 287 vput(vp); 288 return (EBUSY); 289 } 290 291 /* 292 * Allocate and initialize the file system. 293 */ 294 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 295 M_MOUNT, M_WAITOK); 296 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 297 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 298 (void)vfs_busy(mp, LK_NOWAIT, 0); 299 mp->mnt_op = vfs; 300 vfs->vfs_refcount++; 301 mp->mnt_vnodecovered = vp; 302 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 303 mp->mnt_unmounter = NULL; 304 update: 305 /* 306 * Set the mount level flags. 307 */ 308 if (SCARG(uap, flags) & MNT_RDONLY) 309 mp->mnt_flag |= MNT_RDONLY; 310 else if (mp->mnt_flag & MNT_RDONLY) 311 mp->mnt_flag |= MNT_WANTRDWR; 312 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 313 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 314 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 315 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 316 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 317 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 318 MNT_SOFTDEP); 319 /* 320 * Mount the filesystem. 321 */ 322 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 323 if (mp->mnt_flag & MNT_UPDATE) { 324 vrele(vp); 325 if (mp->mnt_flag & MNT_WANTRDWR) 326 mp->mnt_flag &= ~MNT_RDONLY; 327 mp->mnt_flag &=~ 328 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 329 if (error) 330 mp->mnt_flag = flag; 331 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 332 if (mp->mnt_syncer == NULL) 333 error = vfs_allocate_syncvnode(mp); 334 } else { 335 if (mp->mnt_syncer != NULL) 336 vfs_deallocate_syncvnode(mp); 337 } 338 vfs_unbusy(mp); 339 return (error); 340 } 341 /* 342 * Put the new filesystem on the mount list after root. 343 */ 344 cache_purge(vp); 345 if (!error) { 346 vp->v_mountedhere = mp; 347 simple_lock(&mountlist_slock); 348 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 349 simple_unlock(&mountlist_slock); 350 checkdirs(vp); 351 VOP_UNLOCK(vp, 0); 352 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 353 error = vfs_allocate_syncvnode(mp); 354 vfs_unbusy(mp); 355 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 356 if ((error = VFS_START(mp, 0, p))) 357 vrele(vp); 358 } else { 359 vp->v_mountedhere = (struct mount *)0; 360 vfs->vfs_refcount--; 361 vfs_unbusy(mp); 362 free((caddr_t)mp, M_MOUNT); 363 vput(vp); 364 } 365 return (error); 366 } 367 368 /* 369 * Scan all active processes to see if any of them have a current 370 * or root directory onto which the new filesystem has just been 371 * mounted. If so, replace them with the new mount point. 372 */ 373 void 374 checkdirs(olddp) 375 struct vnode *olddp; 376 { 377 struct cwdinfo *cwdi; 378 struct vnode *newdp; 379 struct proc *p; 380 381 if (olddp->v_usecount == 1) 382 return; 383 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 384 panic("mount: lost mount"); 385 proclist_lock_read(); 386 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 387 cwdi = p->p_cwdi; 388 if (cwdi->cwdi_cdir == olddp) { 389 vrele(cwdi->cwdi_cdir); 390 VREF(newdp); 391 cwdi->cwdi_cdir = newdp; 392 } 393 if (cwdi->cwdi_rdir == olddp) { 394 vrele(cwdi->cwdi_rdir); 395 VREF(newdp); 396 cwdi->cwdi_rdir = newdp; 397 } 398 } 399 proclist_unlock_read(); 400 if (rootvnode == olddp) { 401 vrele(rootvnode); 402 VREF(newdp); 403 rootvnode = newdp; 404 } 405 vput(newdp); 406 } 407 408 /* 409 * Unmount a file system. 410 * 411 * Note: unmount takes a path to the vnode mounted on as argument, 412 * not special file (as before). 413 */ 414 /* ARGSUSED */ 415 int 416 sys_unmount(l, v, retval) 417 struct lwp *l; 418 void *v; 419 register_t *retval; 420 { 421 struct sys_unmount_args /* { 422 syscallarg(const char *) path; 423 syscallarg(int) flags; 424 } */ *uap = v; 425 struct proc *p = l->l_proc; 426 struct vnode *vp; 427 struct mount *mp; 428 int error; 429 struct nameidata nd; 430 431 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 432 SCARG(uap, path), p); 433 if ((error = namei(&nd)) != 0) 434 return (error); 435 vp = nd.ni_vp; 436 mp = vp->v_mount; 437 438 /* 439 * Only root, or the user that did the original mount is 440 * permitted to unmount this filesystem. 441 */ 442 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 443 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 444 vput(vp); 445 return (error); 446 } 447 448 /* 449 * Don't allow unmounting the root file system. 450 */ 451 if (mp->mnt_flag & MNT_ROOTFS) { 452 vput(vp); 453 return (EINVAL); 454 } 455 456 /* 457 * Must be the root of the filesystem 458 */ 459 if ((vp->v_flag & VROOT) == 0) { 460 vput(vp); 461 return (EINVAL); 462 } 463 vput(vp); 464 465 /* 466 * XXX Freeze syncer. Must do this before locking the 467 * mount point. See dounmount() for details. 468 */ 469 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 470 471 if (vfs_busy(mp, 0, 0)) { 472 lockmgr(&syncer_lock, LK_RELEASE, NULL); 473 return (EBUSY); 474 } 475 476 return (dounmount(mp, SCARG(uap, flags), p)); 477 } 478 479 /* 480 * Do the actual file system unmount. File system is assumed to have been 481 * marked busy by the caller. 482 */ 483 int 484 dounmount(mp, flags, p) 485 struct mount *mp; 486 int flags; 487 struct proc *p; 488 { 489 struct vnode *coveredvp; 490 int error; 491 int async; 492 int used_syncer; 493 494 simple_lock(&mountlist_slock); 495 vfs_unbusy(mp); 496 used_syncer = (mp->mnt_syncer != NULL); 497 498 /* 499 * XXX Syncer must be frozen when we get here. This should really 500 * be done on a per-mountpoint basis, but especially the softdep 501 * code possibly called from the syncer doens't exactly work on a 502 * per-mountpoint basis, so the softdep code would become a maze 503 * of vfs_busy() calls. 504 * 505 * The caller of dounmount() must acquire syncer_lock because 506 * the syncer itself acquires locks in syncer_lock -> vfs_busy 507 * order, and we must preserve that order to avoid deadlock. 508 * 509 * So, if the file system did not use the syncer, now is 510 * the time to release the syncer_lock. 511 */ 512 if (used_syncer == 0) 513 lockmgr(&syncer_lock, LK_RELEASE, NULL); 514 515 mp->mnt_flag |= MNT_UNMOUNT; 516 mp->mnt_unmounter = p; 517 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 518 if (mp->mnt_flag & MNT_EXPUBLIC) 519 vfs_setpublicfs(NULL, NULL, NULL); 520 async = mp->mnt_flag & MNT_ASYNC; 521 mp->mnt_flag &= ~MNT_ASYNC; 522 cache_purgevfs(mp); /* remove cache entries for this file sys */ 523 if (mp->mnt_syncer != NULL) 524 vfs_deallocate_syncvnode(mp); 525 if (((mp->mnt_flag & MNT_RDONLY) || 526 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 527 (flags & MNT_FORCE)) 528 error = VFS_UNMOUNT(mp, flags, p); 529 simple_lock(&mountlist_slock); 530 if (error) { 531 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 532 (void) vfs_allocate_syncvnode(mp); 533 mp->mnt_flag &= ~MNT_UNMOUNT; 534 mp->mnt_unmounter = NULL; 535 mp->mnt_flag |= async; 536 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 537 &mountlist_slock); 538 if (used_syncer) 539 lockmgr(&syncer_lock, LK_RELEASE, NULL); 540 while (mp->mnt_wcnt > 0) { 541 wakeup((caddr_t)mp); 542 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 543 } 544 return (error); 545 } 546 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 547 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 548 coveredvp->v_mountedhere = NULL; 549 vrele(coveredvp); 550 } 551 mp->mnt_op->vfs_refcount--; 552 if (mp->mnt_vnodelist.lh_first != NULL) 553 panic("unmount: dangling vnode"); 554 mp->mnt_flag |= MNT_GONE; 555 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 556 if (used_syncer) 557 lockmgr(&syncer_lock, LK_RELEASE, NULL); 558 while(mp->mnt_wcnt > 0) { 559 wakeup((caddr_t)mp); 560 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 561 } 562 free((caddr_t)mp, M_MOUNT); 563 return (0); 564 } 565 566 /* 567 * Sync each mounted filesystem. 568 */ 569 #ifdef DEBUG 570 int syncprt = 0; 571 struct ctldebug debug0 = { "syncprt", &syncprt }; 572 #endif 573 574 /* ARGSUSED */ 575 int 576 sys_sync(l, v, retval) 577 struct lwp *l; 578 void *v; 579 register_t *retval; 580 { 581 struct mount *mp, *nmp; 582 int asyncflag; 583 struct proc *p = l->l_proc; 584 585 simple_lock(&mountlist_slock); 586 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 587 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 588 nmp = mp->mnt_list.cqe_prev; 589 continue; 590 } 591 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 592 asyncflag = mp->mnt_flag & MNT_ASYNC; 593 mp->mnt_flag &= ~MNT_ASYNC; 594 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 595 if (asyncflag) 596 mp->mnt_flag |= MNT_ASYNC; 597 } 598 simple_lock(&mountlist_slock); 599 nmp = mp->mnt_list.cqe_prev; 600 vfs_unbusy(mp); 601 602 } 603 simple_unlock(&mountlist_slock); 604 #ifdef DEBUG 605 if (syncprt) 606 vfs_bufstats(); 607 #endif /* DEBUG */ 608 return (0); 609 } 610 611 /* 612 * Change filesystem quotas. 613 */ 614 /* ARGSUSED */ 615 int 616 sys_quotactl(l, v, retval) 617 struct lwp *l; 618 void *v; 619 register_t *retval; 620 { 621 struct sys_quotactl_args /* { 622 syscallarg(const char *) path; 623 syscallarg(int) cmd; 624 syscallarg(int) uid; 625 syscallarg(caddr_t) arg; 626 } */ *uap = v; 627 struct proc *p = l->l_proc; 628 struct mount *mp; 629 int error; 630 struct nameidata nd; 631 632 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 633 if ((error = namei(&nd)) != 0) 634 return (error); 635 mp = nd.ni_vp->v_mount; 636 vrele(nd.ni_vp); 637 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 638 SCARG(uap, arg), p)); 639 } 640 641 /* 642 * Get filesystem statistics. 643 */ 644 /* ARGSUSED */ 645 int 646 sys_statfs(l, v, retval) 647 struct lwp *l; 648 void *v; 649 register_t *retval; 650 { 651 struct sys_statfs_args /* { 652 syscallarg(const char *) path; 653 syscallarg(struct statfs *) buf; 654 } */ *uap = v; 655 struct proc *p = l->l_proc; 656 struct mount *mp; 657 struct statfs *sp; 658 int error; 659 struct nameidata nd; 660 661 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 662 if ((error = namei(&nd)) != 0) 663 return (error); 664 mp = nd.ni_vp->v_mount; 665 sp = &mp->mnt_stat; 666 vrele(nd.ni_vp); 667 if ((error = VFS_STATFS(mp, sp, p)) != 0) 668 return (error); 669 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 670 sp->f_oflags = sp->f_flags & 0xffff; 671 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 672 } 673 674 /* 675 * Get filesystem statistics. 676 */ 677 /* ARGSUSED */ 678 int 679 sys_fstatfs(l, v, retval) 680 struct lwp *l; 681 void *v; 682 register_t *retval; 683 { 684 struct sys_fstatfs_args /* { 685 syscallarg(int) fd; 686 syscallarg(struct statfs *) buf; 687 } */ *uap = v; 688 struct proc *p = l->l_proc; 689 struct file *fp; 690 struct mount *mp; 691 struct statfs *sp; 692 int error; 693 694 /* getvnode() will use the descriptor for us */ 695 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 696 return (error); 697 mp = ((struct vnode *)fp->f_data)->v_mount; 698 sp = &mp->mnt_stat; 699 if ((error = VFS_STATFS(mp, sp, p)) != 0) 700 goto out; 701 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 702 sp->f_oflags = sp->f_flags & 0xffff; 703 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 704 out: 705 FILE_UNUSE(fp, p); 706 return (error); 707 } 708 709 /* 710 * Get statistics on all filesystems. 711 */ 712 int 713 sys_getfsstat(l, v, retval) 714 struct lwp *l; 715 void *v; 716 register_t *retval; 717 { 718 struct sys_getfsstat_args /* { 719 syscallarg(struct statfs *) buf; 720 syscallarg(long) bufsize; 721 syscallarg(int) flags; 722 } */ *uap = v; 723 struct proc *p = l->l_proc; 724 struct mount *mp, *nmp; 725 struct statfs *sp; 726 caddr_t sfsp; 727 long count, maxcount, error; 728 729 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 730 sfsp = (caddr_t)SCARG(uap, buf); 731 simple_lock(&mountlist_slock); 732 count = 0; 733 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 734 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 735 nmp = mp->mnt_list.cqe_next; 736 continue; 737 } 738 if (sfsp && count < maxcount) { 739 sp = &mp->mnt_stat; 740 /* 741 * If MNT_NOWAIT or MNT_LAZY is specified, do not 742 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 743 * overrides MNT_NOWAIT. 744 */ 745 if (SCARG(uap, flags) != MNT_NOWAIT && 746 SCARG(uap, flags) != MNT_LAZY && 747 (SCARG(uap, flags) == MNT_WAIT || 748 SCARG(uap, flags) == 0) && 749 (error = VFS_STATFS(mp, sp, p)) != 0) { 750 simple_lock(&mountlist_slock); 751 nmp = mp->mnt_list.cqe_next; 752 vfs_unbusy(mp); 753 continue; 754 } 755 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 756 sp->f_oflags = sp->f_flags & 0xffff; 757 error = copyout(sp, sfsp, sizeof(*sp)); 758 if (error) { 759 vfs_unbusy(mp); 760 return (error); 761 } 762 sfsp += sizeof(*sp); 763 } 764 count++; 765 simple_lock(&mountlist_slock); 766 nmp = mp->mnt_list.cqe_next; 767 vfs_unbusy(mp); 768 } 769 simple_unlock(&mountlist_slock); 770 if (sfsp && count > maxcount) 771 *retval = maxcount; 772 else 773 *retval = count; 774 return (0); 775 } 776 777 /* 778 * Change current working directory to a given file descriptor. 779 */ 780 /* ARGSUSED */ 781 int 782 sys_fchdir(l, v, retval) 783 struct lwp *l; 784 void *v; 785 register_t *retval; 786 { 787 struct sys_fchdir_args /* { 788 syscallarg(int) fd; 789 } */ *uap = v; 790 struct proc *p = l->l_proc; 791 struct filedesc *fdp = p->p_fd; 792 struct cwdinfo *cwdi = p->p_cwdi; 793 struct vnode *vp, *tdp; 794 struct mount *mp; 795 struct file *fp; 796 int error; 797 798 /* getvnode() will use the descriptor for us */ 799 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 800 return (error); 801 vp = (struct vnode *)fp->f_data; 802 803 VREF(vp); 804 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 805 if (vp->v_type != VDIR) 806 error = ENOTDIR; 807 else 808 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 809 while (!error && (mp = vp->v_mountedhere) != NULL) { 810 if (vfs_busy(mp, 0, 0)) 811 continue; 812 error = VFS_ROOT(mp, &tdp); 813 vfs_unbusy(mp); 814 if (error) 815 break; 816 vput(vp); 817 vp = tdp; 818 } 819 if (error) { 820 vput(vp); 821 goto out; 822 } 823 VOP_UNLOCK(vp, 0); 824 825 /* 826 * Disallow changing to a directory not under the process's 827 * current root directory (if there is one). 828 */ 829 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 830 vrele(vp); 831 error = EPERM; /* operation not permitted */ 832 goto out; 833 } 834 835 vrele(cwdi->cwdi_cdir); 836 cwdi->cwdi_cdir = vp; 837 out: 838 FILE_UNUSE(fp, p); 839 return (error); 840 } 841 842 /* 843 * Change this process's notion of the root directory to a given file descriptor. 844 */ 845 846 int 847 sys_fchroot(l, v, retval) 848 struct lwp *l; 849 void *v; 850 register_t *retval; 851 { 852 struct sys_fchroot_args *uap = v; 853 struct proc *p = l->l_proc; 854 struct filedesc *fdp = p->p_fd; 855 struct cwdinfo *cwdi = p->p_cwdi; 856 struct vnode *vp; 857 struct file *fp; 858 int error; 859 860 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 861 return error; 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 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 867 if (vp->v_type != VDIR) 868 error = ENOTDIR; 869 else 870 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 871 VOP_UNLOCK(vp, 0); 872 if (error) 873 goto out; 874 VREF(vp); 875 876 /* 877 * Prevent escaping from chroot by putting the root under 878 * the working directory. Silently chdir to / if we aren't 879 * already there. 880 */ 881 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 882 /* 883 * XXX would be more failsafe to change directory to a 884 * deadfs node here instead 885 */ 886 vrele(cwdi->cwdi_cdir); 887 VREF(vp); 888 cwdi->cwdi_cdir = vp; 889 } 890 891 if (cwdi->cwdi_rdir != NULL) 892 vrele(cwdi->cwdi_rdir); 893 cwdi->cwdi_rdir = vp; 894 out: 895 FILE_UNUSE(fp, p); 896 return (error); 897 } 898 899 900 901 /* 902 * Change current working directory (``.''). 903 */ 904 /* ARGSUSED */ 905 int 906 sys_chdir(l, v, retval) 907 struct lwp *l; 908 void *v; 909 register_t *retval; 910 { 911 struct sys_chdir_args /* { 912 syscallarg(const char *) path; 913 } */ *uap = v; 914 struct proc *p = l->l_proc; 915 struct cwdinfo *cwdi = p->p_cwdi; 916 int error; 917 struct nameidata nd; 918 919 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 920 SCARG(uap, path), p); 921 if ((error = change_dir(&nd, p)) != 0) 922 return (error); 923 vrele(cwdi->cwdi_cdir); 924 cwdi->cwdi_cdir = nd.ni_vp; 925 return (0); 926 } 927 928 /* 929 * Change notion of root (``/'') directory. 930 */ 931 /* ARGSUSED */ 932 int 933 sys_chroot(l, v, retval) 934 struct lwp *l; 935 void *v; 936 register_t *retval; 937 { 938 struct sys_chroot_args /* { 939 syscallarg(const char *) path; 940 } */ *uap = v; 941 struct proc *p = l->l_proc; 942 struct cwdinfo *cwdi = p->p_cwdi; 943 struct vnode *vp; 944 int error; 945 struct nameidata nd; 946 947 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 948 return (error); 949 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 950 SCARG(uap, path), p); 951 if ((error = change_dir(&nd, p)) != 0) 952 return (error); 953 if (cwdi->cwdi_rdir != NULL) 954 vrele(cwdi->cwdi_rdir); 955 vp = nd.ni_vp; 956 cwdi->cwdi_rdir = vp; 957 958 /* 959 * Prevent escaping from chroot by putting the root under 960 * the working directory. Silently chdir to / if we aren't 961 * already there. 962 */ 963 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 964 /* 965 * XXX would be more failsafe to change directory to a 966 * deadfs node here instead 967 */ 968 vrele(cwdi->cwdi_cdir); 969 VREF(vp); 970 cwdi->cwdi_cdir = vp; 971 } 972 973 return (0); 974 } 975 976 /* 977 * Common routine for chroot and chdir. 978 */ 979 static int 980 change_dir(ndp, p) 981 struct nameidata *ndp; 982 struct proc *p; 983 { 984 struct vnode *vp; 985 int error; 986 987 if ((error = namei(ndp)) != 0) 988 return (error); 989 vp = ndp->ni_vp; 990 if (vp->v_type != VDIR) 991 error = ENOTDIR; 992 else 993 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 994 995 if (error) 996 vput(vp); 997 else 998 VOP_UNLOCK(vp, 0); 999 return (error); 1000 } 1001 1002 /* 1003 * Check permissions, allocate an open file structure, 1004 * and call the device open routine if any. 1005 */ 1006 int 1007 sys_open(l, v, retval) 1008 struct lwp *l; 1009 void *v; 1010 register_t *retval; 1011 { 1012 struct sys_open_args /* { 1013 syscallarg(const char *) path; 1014 syscallarg(int) flags; 1015 syscallarg(int) mode; 1016 } */ *uap = v; 1017 struct proc *p = l->l_proc; 1018 struct cwdinfo *cwdi = p->p_cwdi; 1019 struct filedesc *fdp = p->p_fd; 1020 struct file *fp; 1021 struct vnode *vp; 1022 int flags, cmode; 1023 int type, indx, error; 1024 struct flock lf; 1025 struct nameidata nd; 1026 1027 flags = FFLAGS(SCARG(uap, flags)); 1028 if ((flags & (FREAD | FWRITE)) == 0) 1029 return (EINVAL); 1030 /* falloc() will use the file descriptor for us */ 1031 if ((error = falloc(p, &fp, &indx)) != 0) 1032 return (error); 1033 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1034 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1035 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1036 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1037 FILE_UNUSE(fp, p); 1038 ffree(fp); 1039 if ((error == ENODEV || error == ENXIO) && 1040 p->p_dupfd >= 0 && /* XXX from fdopen */ 1041 (error = 1042 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1043 *retval = indx; 1044 return (0); 1045 } 1046 if (error == ERESTART) 1047 error = EINTR; 1048 fdremove(fdp, indx); 1049 return (error); 1050 } 1051 p->p_dupfd = 0; 1052 vp = nd.ni_vp; 1053 fp->f_flag = flags & FMASK; 1054 fp->f_type = DTYPE_VNODE; 1055 fp->f_ops = &vnops; 1056 fp->f_data = (caddr_t)vp; 1057 if (flags & (O_EXLOCK | O_SHLOCK)) { 1058 lf.l_whence = SEEK_SET; 1059 lf.l_start = 0; 1060 lf.l_len = 0; 1061 if (flags & O_EXLOCK) 1062 lf.l_type = F_WRLCK; 1063 else 1064 lf.l_type = F_RDLCK; 1065 type = F_FLOCK; 1066 if ((flags & FNONBLOCK) == 0) 1067 type |= F_WAIT; 1068 VOP_UNLOCK(vp, 0); 1069 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1070 if (error) { 1071 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1072 FILE_UNUSE(fp, p); 1073 ffree(fp); 1074 fdremove(fdp, indx); 1075 return (error); 1076 } 1077 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1078 fp->f_flag |= FHASLOCK; 1079 } 1080 VOP_UNLOCK(vp, 0); 1081 *retval = indx; 1082 FILE_SET_MATURE(fp); 1083 FILE_UNUSE(fp, p); 1084 return (0); 1085 } 1086 1087 /* 1088 * Get file handle system call 1089 */ 1090 int 1091 sys_getfh(l, v, retval) 1092 struct lwp *l; 1093 void *v; 1094 register_t *retval; 1095 { 1096 struct sys_getfh_args /* { 1097 syscallarg(char *) fname; 1098 syscallarg(fhandle_t *) fhp; 1099 } */ *uap = v; 1100 struct proc *p = l->l_proc; 1101 struct vnode *vp; 1102 fhandle_t fh; 1103 int error; 1104 struct nameidata nd; 1105 1106 /* 1107 * Must be super user 1108 */ 1109 error = suser(p->p_ucred, &p->p_acflag); 1110 if (error) 1111 return (error); 1112 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1113 SCARG(uap, fname), p); 1114 error = namei(&nd); 1115 if (error) 1116 return (error); 1117 vp = nd.ni_vp; 1118 memset((caddr_t)&fh, 0, sizeof(fh)); 1119 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1120 error = VFS_VPTOFH(vp, &fh.fh_fid); 1121 vput(vp); 1122 if (error) 1123 return (error); 1124 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1125 return (error); 1126 } 1127 1128 /* 1129 * Open a file given a file handle. 1130 * 1131 * Check permissions, allocate an open file structure, 1132 * and call the device open routine if any. 1133 */ 1134 int 1135 sys_fhopen(l, v, retval) 1136 struct lwp *l; 1137 void *v; 1138 register_t *retval; 1139 { 1140 struct sys_fhopen_args /* { 1141 syscallarg(const fhandle_t *) fhp; 1142 syscallarg(int) flags; 1143 } */ *uap = v; 1144 struct proc *p = l->l_proc; 1145 struct filedesc *fdp = p->p_fd; 1146 struct file *fp; 1147 struct vnode *vp = NULL; 1148 struct mount *mp; 1149 struct ucred *cred = p->p_ucred; 1150 int flags; 1151 struct file *nfp; 1152 int type, indx, error=0; 1153 struct flock lf; 1154 struct vattr va; 1155 fhandle_t fh; 1156 1157 /* 1158 * Must be super user 1159 */ 1160 if ((error = suser(p->p_ucred, &p->p_acflag))) 1161 return (error); 1162 1163 flags = FFLAGS(SCARG(uap, flags)); 1164 if ((flags & (FREAD | FWRITE)) == 0) 1165 return (EINVAL); 1166 if ((flags & O_CREAT)) 1167 return (EINVAL); 1168 /* falloc() will use the file descriptor for us */ 1169 if ((error = falloc(p, &nfp, &indx)) != 0) 1170 return (error); 1171 fp = nfp; 1172 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1173 goto bad; 1174 1175 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1176 error = ESTALE; 1177 goto bad; 1178 } 1179 1180 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1181 vp = NULL; /* most likely unnecessary sanity for bad: */ 1182 goto bad; 1183 } 1184 1185 /* Now do an effective vn_open */ 1186 1187 if (vp->v_type == VSOCK) { 1188 error = EOPNOTSUPP; 1189 goto bad; 1190 } 1191 if (flags & FREAD) { 1192 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1193 goto bad; 1194 } 1195 if (flags & (FWRITE | O_TRUNC)) { 1196 if (vp->v_type == VDIR) { 1197 error = EISDIR; 1198 goto bad; 1199 } 1200 if ((error = vn_writechk(vp)) != 0 || 1201 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1202 goto bad; 1203 } 1204 if (flags & O_TRUNC) { 1205 VOP_UNLOCK(vp, 0); /* XXX */ 1206 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1207 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1208 VATTR_NULL(&va); 1209 va.va_size = 0; 1210 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1211 goto bad; 1212 } 1213 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1214 goto bad; 1215 if (vp->v_type == VREG && 1216 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1217 error = EIO; 1218 goto bad; 1219 } 1220 if (flags & FWRITE) 1221 vp->v_writecount++; 1222 1223 /* done with modified vn_open, now finish what sys_open does. */ 1224 1225 fp->f_flag = flags & FMASK; 1226 fp->f_type = DTYPE_VNODE; 1227 fp->f_ops = &vnops; 1228 fp->f_data = (caddr_t)vp; 1229 if (flags & (O_EXLOCK | O_SHLOCK)) { 1230 lf.l_whence = SEEK_SET; 1231 lf.l_start = 0; 1232 lf.l_len = 0; 1233 if (flags & O_EXLOCK) 1234 lf.l_type = F_WRLCK; 1235 else 1236 lf.l_type = F_RDLCK; 1237 type = F_FLOCK; 1238 if ((flags & FNONBLOCK) == 0) 1239 type |= F_WAIT; 1240 VOP_UNLOCK(vp, 0); 1241 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1242 if (error) { 1243 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1244 FILE_UNUSE(fp, p); 1245 ffree(fp); 1246 fdremove(fdp, indx); 1247 return (error); 1248 } 1249 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1250 fp->f_flag |= FHASLOCK; 1251 } 1252 VOP_UNLOCK(vp, 0); 1253 *retval = indx; 1254 FILE_SET_MATURE(fp); 1255 FILE_UNUSE(fp, p); 1256 return (0); 1257 1258 bad: 1259 FILE_UNUSE(fp, p); 1260 ffree(fp); 1261 fdremove(fdp, indx); 1262 if (vp != NULL) 1263 vput(vp); 1264 return (error); 1265 } 1266 1267 /* ARGSUSED */ 1268 int 1269 sys_fhstat(l, v, retval) 1270 struct lwp *l; 1271 void *v; 1272 register_t *retval; 1273 { 1274 struct sys_fhstat_args /* { 1275 syscallarg(const fhandle_t *) fhp; 1276 syscallarg(struct stat *) sb; 1277 } */ *uap = v; 1278 struct proc *p = l->l_proc; 1279 struct stat sb; 1280 int error; 1281 fhandle_t fh; 1282 struct mount *mp; 1283 struct vnode *vp; 1284 1285 /* 1286 * Must be super user 1287 */ 1288 if ((error = suser(p->p_ucred, &p->p_acflag))) 1289 return (error); 1290 1291 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1292 return (error); 1293 1294 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1295 return (ESTALE); 1296 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1297 return (error); 1298 error = vn_stat(vp, &sb, p); 1299 vput(vp); 1300 if (error) 1301 return (error); 1302 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1303 return (error); 1304 } 1305 1306 /* ARGSUSED */ 1307 int 1308 sys_fhstatfs(l, v, retval) 1309 struct lwp *l; 1310 void *v; 1311 register_t *retval; 1312 { 1313 struct sys_fhstatfs_args /* 1314 syscallarg(const fhandle_t *) fhp; 1315 syscallarg(struct statfs *) buf; 1316 } */ *uap = v; 1317 struct proc *p = l->l_proc; 1318 struct statfs sp; 1319 fhandle_t fh; 1320 struct mount *mp; 1321 struct vnode *vp; 1322 int error; 1323 1324 /* 1325 * Must be super user 1326 */ 1327 if ((error = suser(p->p_ucred, &p->p_acflag))) 1328 return (error); 1329 1330 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1331 return (error); 1332 1333 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1334 return (ESTALE); 1335 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1336 return (error); 1337 mp = vp->v_mount; 1338 vput(vp); 1339 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1340 return (error); 1341 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1342 sp.f_oflags = sp.f_flags & 0xffff; 1343 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1344 } 1345 1346 /* 1347 * Create a special file. 1348 */ 1349 /* ARGSUSED */ 1350 int 1351 sys_mknod(l, v, retval) 1352 struct lwp *l; 1353 void *v; 1354 register_t *retval; 1355 { 1356 struct sys_mknod_args /* { 1357 syscallarg(const char *) path; 1358 syscallarg(int) mode; 1359 syscallarg(int) dev; 1360 } */ *uap = v; 1361 struct proc *p = l->l_proc; 1362 struct vnode *vp; 1363 struct vattr vattr; 1364 int error; 1365 int whiteout = 0; 1366 struct nameidata nd; 1367 1368 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1369 return (error); 1370 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1371 if ((error = namei(&nd)) != 0) 1372 return (error); 1373 vp = nd.ni_vp; 1374 if (vp != NULL) 1375 error = EEXIST; 1376 else { 1377 VATTR_NULL(&vattr); 1378 vattr.va_mode = 1379 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1380 vattr.va_rdev = SCARG(uap, dev); 1381 whiteout = 0; 1382 1383 switch (SCARG(uap, mode) & S_IFMT) { 1384 case S_IFMT: /* used by badsect to flag bad sectors */ 1385 vattr.va_type = VBAD; 1386 break; 1387 case S_IFCHR: 1388 vattr.va_type = VCHR; 1389 break; 1390 case S_IFBLK: 1391 vattr.va_type = VBLK; 1392 break; 1393 case S_IFWHT: 1394 whiteout = 1; 1395 break; 1396 default: 1397 error = EINVAL; 1398 break; 1399 } 1400 } 1401 if (!error) { 1402 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1403 if (whiteout) { 1404 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1405 if (error) 1406 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1407 vput(nd.ni_dvp); 1408 } else { 1409 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1410 &nd.ni_cnd, &vattr); 1411 } 1412 } else { 1413 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1414 if (nd.ni_dvp == vp) 1415 vrele(nd.ni_dvp); 1416 else 1417 vput(nd.ni_dvp); 1418 if (vp) 1419 vrele(vp); 1420 } 1421 return (error); 1422 } 1423 1424 /* 1425 * Create a named pipe. 1426 */ 1427 /* ARGSUSED */ 1428 int 1429 sys_mkfifo(l, v, retval) 1430 struct lwp *l; 1431 void *v; 1432 register_t *retval; 1433 { 1434 struct sys_mkfifo_args /* { 1435 syscallarg(const char *) path; 1436 syscallarg(int) mode; 1437 } */ *uap = v; 1438 struct proc *p = l->l_proc; 1439 struct vattr vattr; 1440 int error; 1441 struct nameidata nd; 1442 1443 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1444 if ((error = namei(&nd)) != 0) 1445 return (error); 1446 if (nd.ni_vp != NULL) { 1447 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1448 if (nd.ni_dvp == nd.ni_vp) 1449 vrele(nd.ni_dvp); 1450 else 1451 vput(nd.ni_dvp); 1452 vrele(nd.ni_vp); 1453 return (EEXIST); 1454 } 1455 VATTR_NULL(&vattr); 1456 vattr.va_type = VFIFO; 1457 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1458 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1459 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1460 } 1461 1462 /* 1463 * Make a hard file link. 1464 */ 1465 /* ARGSUSED */ 1466 int 1467 sys_link(l, v, retval) 1468 struct lwp *l; 1469 void *v; 1470 register_t *retval; 1471 { 1472 struct sys_link_args /* { 1473 syscallarg(const char *) path; 1474 syscallarg(const char *) link; 1475 } */ *uap = v; 1476 struct proc *p = l->l_proc; 1477 struct vnode *vp; 1478 struct nameidata nd; 1479 int error; 1480 1481 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1482 if ((error = namei(&nd)) != 0) 1483 return (error); 1484 vp = nd.ni_vp; 1485 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1486 if ((error = namei(&nd)) != 0) 1487 goto out; 1488 if (nd.ni_vp) { 1489 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1490 if (nd.ni_dvp == nd.ni_vp) 1491 vrele(nd.ni_dvp); 1492 else 1493 vput(nd.ni_dvp); 1494 vrele(nd.ni_vp); 1495 error = EEXIST; 1496 goto out; 1497 } 1498 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1499 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1500 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1501 out: 1502 vrele(vp); 1503 return (error); 1504 } 1505 1506 /* 1507 * Make a symbolic link. 1508 */ 1509 /* ARGSUSED */ 1510 int 1511 sys_symlink(l, v, retval) 1512 struct lwp *l; 1513 void *v; 1514 register_t *retval; 1515 { 1516 struct sys_symlink_args /* { 1517 syscallarg(const char *) path; 1518 syscallarg(const char *) link; 1519 } */ *uap = v; 1520 struct proc *p = l->l_proc; 1521 struct vattr vattr; 1522 char *path; 1523 int error; 1524 struct nameidata nd; 1525 1526 path = PNBUF_GET(); 1527 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1528 if (error) 1529 goto out; 1530 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1531 if ((error = namei(&nd)) != 0) 1532 goto out; 1533 if (nd.ni_vp) { 1534 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1535 if (nd.ni_dvp == nd.ni_vp) 1536 vrele(nd.ni_dvp); 1537 else 1538 vput(nd.ni_dvp); 1539 vrele(nd.ni_vp); 1540 error = EEXIST; 1541 goto out; 1542 } 1543 VATTR_NULL(&vattr); 1544 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1545 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1546 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1547 out: 1548 PNBUF_PUT(path); 1549 return (error); 1550 } 1551 1552 /* 1553 * Delete a whiteout from the filesystem. 1554 */ 1555 /* ARGSUSED */ 1556 int 1557 sys_undelete(l, v, retval) 1558 struct lwp *l; 1559 void *v; 1560 register_t *retval; 1561 { 1562 struct sys_undelete_args /* { 1563 syscallarg(const char *) path; 1564 } */ *uap = v; 1565 struct proc *p = l->l_proc; 1566 int error; 1567 struct nameidata nd; 1568 1569 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1570 SCARG(uap, path), p); 1571 error = namei(&nd); 1572 if (error) 1573 return (error); 1574 1575 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1576 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1577 if (nd.ni_dvp == nd.ni_vp) 1578 vrele(nd.ni_dvp); 1579 else 1580 vput(nd.ni_dvp); 1581 if (nd.ni_vp) 1582 vrele(nd.ni_vp); 1583 return (EEXIST); 1584 } 1585 1586 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1587 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1588 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1589 vput(nd.ni_dvp); 1590 return (error); 1591 } 1592 1593 /* 1594 * Delete a name from the filesystem. 1595 */ 1596 /* ARGSUSED */ 1597 int 1598 sys_unlink(l, v, retval) 1599 struct lwp *l; 1600 void *v; 1601 register_t *retval; 1602 { 1603 struct sys_unlink_args /* { 1604 syscallarg(const char *) path; 1605 } */ *uap = v; 1606 struct proc *p = l->l_proc; 1607 struct vnode *vp; 1608 int error; 1609 struct nameidata nd; 1610 1611 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1612 SCARG(uap, path), p); 1613 if ((error = namei(&nd)) != 0) 1614 return (error); 1615 vp = nd.ni_vp; 1616 1617 /* 1618 * The root of a mounted filesystem cannot be deleted. 1619 */ 1620 if (vp->v_flag & VROOT) { 1621 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1622 if (nd.ni_dvp == vp) 1623 vrele(nd.ni_dvp); 1624 else 1625 vput(nd.ni_dvp); 1626 vput(vp); 1627 error = EBUSY; 1628 goto out; 1629 } 1630 1631 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1632 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1633 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1634 out: 1635 return (error); 1636 } 1637 1638 /* 1639 * Reposition read/write file offset. 1640 */ 1641 int 1642 sys_lseek(l, v, retval) 1643 struct lwp *l; 1644 void *v; 1645 register_t *retval; 1646 { 1647 struct sys_lseek_args /* { 1648 syscallarg(int) fd; 1649 syscallarg(int) pad; 1650 syscallarg(off_t) offset; 1651 syscallarg(int) whence; 1652 } */ *uap = v; 1653 struct proc *p = l->l_proc; 1654 struct ucred *cred = p->p_ucred; 1655 struct filedesc *fdp = p->p_fd; 1656 struct file *fp; 1657 struct vnode *vp; 1658 struct vattr vattr; 1659 off_t newoff; 1660 int error; 1661 1662 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1663 return (EBADF); 1664 1665 FILE_USE(fp); 1666 1667 vp = (struct vnode *)fp->f_data; 1668 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1669 error = ESPIPE; 1670 goto out; 1671 } 1672 1673 switch (SCARG(uap, whence)) { 1674 case SEEK_CUR: 1675 newoff = fp->f_offset + SCARG(uap, offset); 1676 break; 1677 case SEEK_END: 1678 error = VOP_GETATTR(vp, &vattr, cred, p); 1679 if (error) 1680 goto out; 1681 newoff = SCARG(uap, offset) + vattr.va_size; 1682 break; 1683 case SEEK_SET: 1684 newoff = SCARG(uap, offset); 1685 break; 1686 default: 1687 error = EINVAL; 1688 goto out; 1689 } 1690 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1691 goto out; 1692 1693 *(off_t *)retval = fp->f_offset = newoff; 1694 out: 1695 FILE_UNUSE(fp, p); 1696 return (error); 1697 } 1698 1699 /* 1700 * Positional read system call. 1701 */ 1702 int 1703 sys_pread(l, v, retval) 1704 struct lwp *l; 1705 void *v; 1706 register_t *retval; 1707 { 1708 struct sys_pread_args /* { 1709 syscallarg(int) fd; 1710 syscallarg(void *) buf; 1711 syscallarg(size_t) nbyte; 1712 syscallarg(off_t) offset; 1713 } */ *uap = v; 1714 struct proc *p = l->l_proc; 1715 struct filedesc *fdp = p->p_fd; 1716 struct file *fp; 1717 struct vnode *vp; 1718 off_t offset; 1719 int error, fd = SCARG(uap, fd); 1720 1721 if ((fp = fd_getfile(fdp, fd)) == NULL) 1722 return (EBADF); 1723 1724 if ((fp->f_flag & FREAD) == 0) 1725 return (EBADF); 1726 1727 FILE_USE(fp); 1728 1729 vp = (struct vnode *)fp->f_data; 1730 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1731 error = ESPIPE; 1732 goto out; 1733 } 1734 1735 offset = SCARG(uap, offset); 1736 1737 /* 1738 * XXX This works because no file systems actually 1739 * XXX take any action on the seek operation. 1740 */ 1741 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1742 goto out; 1743 1744 /* dofileread() will unuse the descriptor for us */ 1745 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1746 &offset, 0, retval)); 1747 1748 out: 1749 FILE_UNUSE(fp, p); 1750 return (error); 1751 } 1752 1753 /* 1754 * Positional scatter read system call. 1755 */ 1756 int 1757 sys_preadv(l, v, retval) 1758 struct lwp *l; 1759 void *v; 1760 register_t *retval; 1761 { 1762 struct sys_preadv_args /* { 1763 syscallarg(int) fd; 1764 syscallarg(const struct iovec *) iovp; 1765 syscallarg(int) iovcnt; 1766 syscallarg(off_t) offset; 1767 } */ *uap = v; 1768 struct proc *p = l->l_proc; 1769 struct filedesc *fdp = p->p_fd; 1770 struct file *fp; 1771 struct vnode *vp; 1772 off_t offset; 1773 int error, fd = SCARG(uap, fd); 1774 1775 if ((fp = fd_getfile(fdp, fd)) == NULL) 1776 return (EBADF); 1777 1778 if ((fp->f_flag & FREAD) == 0) 1779 return (EBADF); 1780 1781 FILE_USE(fp); 1782 1783 vp = (struct vnode *)fp->f_data; 1784 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1785 error = ESPIPE; 1786 goto out; 1787 } 1788 1789 offset = SCARG(uap, offset); 1790 1791 /* 1792 * XXX This works because no file systems actually 1793 * XXX take any action on the seek operation. 1794 */ 1795 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1796 goto out; 1797 1798 /* dofilereadv() will unuse the descriptor for us */ 1799 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1800 &offset, 0, retval)); 1801 1802 out: 1803 FILE_UNUSE(fp, p); 1804 return (error); 1805 } 1806 1807 /* 1808 * Positional write system call. 1809 */ 1810 int 1811 sys_pwrite(l, v, retval) 1812 struct lwp *l; 1813 void *v; 1814 register_t *retval; 1815 { 1816 struct sys_pwrite_args /* { 1817 syscallarg(int) fd; 1818 syscallarg(const void *) buf; 1819 syscallarg(size_t) nbyte; 1820 syscallarg(off_t) offset; 1821 } */ *uap = v; 1822 struct proc *p = l->l_proc; 1823 struct filedesc *fdp = p->p_fd; 1824 struct file *fp; 1825 struct vnode *vp; 1826 off_t offset; 1827 int error, fd = SCARG(uap, fd); 1828 1829 if ((fp = fd_getfile(fdp, fd)) == NULL) 1830 return (EBADF); 1831 1832 if ((fp->f_flag & FWRITE) == 0) 1833 return (EBADF); 1834 1835 FILE_USE(fp); 1836 1837 vp = (struct vnode *)fp->f_data; 1838 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1839 error = ESPIPE; 1840 goto out; 1841 } 1842 1843 offset = SCARG(uap, offset); 1844 1845 /* 1846 * XXX This works because no file systems actually 1847 * XXX take any action on the seek operation. 1848 */ 1849 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1850 goto out; 1851 1852 /* dofilewrite() will unuse the descriptor for us */ 1853 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1854 &offset, 0, retval)); 1855 1856 out: 1857 FILE_UNUSE(fp, p); 1858 return (error); 1859 } 1860 1861 /* 1862 * Positional gather write system call. 1863 */ 1864 int 1865 sys_pwritev(l, v, retval) 1866 struct lwp *l; 1867 void *v; 1868 register_t *retval; 1869 { 1870 struct sys_pwritev_args /* { 1871 syscallarg(int) fd; 1872 syscallarg(const struct iovec *) iovp; 1873 syscallarg(int) iovcnt; 1874 syscallarg(off_t) offset; 1875 } */ *uap = v; 1876 struct proc *p = l->l_proc; 1877 struct filedesc *fdp = p->p_fd; 1878 struct file *fp; 1879 struct vnode *vp; 1880 off_t offset; 1881 int error, fd = SCARG(uap, fd); 1882 1883 if ((fp = fd_getfile(fdp, fd)) == NULL) 1884 return (EBADF); 1885 1886 if ((fp->f_flag & FWRITE) == 0) 1887 return (EBADF); 1888 1889 FILE_USE(fp); 1890 1891 vp = (struct vnode *)fp->f_data; 1892 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1893 error = ESPIPE; 1894 goto out; 1895 } 1896 1897 offset = SCARG(uap, offset); 1898 1899 /* 1900 * XXX This works because no file systems actually 1901 * XXX take any action on the seek operation. 1902 */ 1903 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1904 goto out; 1905 1906 /* dofilewritev() will unuse the descriptor for us */ 1907 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1908 &offset, 0, retval)); 1909 1910 out: 1911 FILE_UNUSE(fp, p); 1912 return (error); 1913 } 1914 1915 /* 1916 * Check access permissions. 1917 */ 1918 int 1919 sys_access(l, v, retval) 1920 struct lwp *l; 1921 void *v; 1922 register_t *retval; 1923 { 1924 struct sys_access_args /* { 1925 syscallarg(const char *) path; 1926 syscallarg(int) flags; 1927 } */ *uap = v; 1928 struct proc *p = l->l_proc; 1929 struct ucred *cred = p->p_ucred; 1930 struct vnode *vp; 1931 int error, flags, t_gid, t_uid; 1932 struct nameidata nd; 1933 1934 t_uid = cred->cr_uid; 1935 t_gid = cred->cr_gid; 1936 cred->cr_uid = p->p_cred->p_ruid; 1937 cred->cr_gid = p->p_cred->p_rgid; 1938 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1939 SCARG(uap, path), p); 1940 if ((error = namei(&nd)) != 0) 1941 goto out1; 1942 vp = nd.ni_vp; 1943 1944 /* Flags == 0 means only check for existence. */ 1945 if (SCARG(uap, flags)) { 1946 flags = 0; 1947 if (SCARG(uap, flags) & R_OK) 1948 flags |= VREAD; 1949 if (SCARG(uap, flags) & W_OK) 1950 flags |= VWRITE; 1951 if (SCARG(uap, flags) & X_OK) 1952 flags |= VEXEC; 1953 1954 error = VOP_ACCESS(vp, flags, cred, p); 1955 if (!error && (flags & VWRITE)) 1956 error = vn_writechk(vp); 1957 } 1958 vput(vp); 1959 out1: 1960 cred->cr_uid = t_uid; 1961 cred->cr_gid = t_gid; 1962 return (error); 1963 } 1964 1965 /* 1966 * Get file status; this version follows links. 1967 */ 1968 /* ARGSUSED */ 1969 int 1970 sys___stat13(l, v, retval) 1971 struct lwp *l; 1972 void *v; 1973 register_t *retval; 1974 { 1975 struct sys___stat13_args /* { 1976 syscallarg(const char *) path; 1977 syscallarg(struct stat *) ub; 1978 } */ *uap = v; 1979 struct proc *p = l->l_proc; 1980 struct stat sb; 1981 int error; 1982 struct nameidata nd; 1983 1984 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1985 SCARG(uap, path), p); 1986 if ((error = namei(&nd)) != 0) 1987 return (error); 1988 error = vn_stat(nd.ni_vp, &sb, p); 1989 vput(nd.ni_vp); 1990 if (error) 1991 return (error); 1992 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1993 return (error); 1994 } 1995 1996 /* 1997 * Get file status; this version does not follow links. 1998 */ 1999 /* ARGSUSED */ 2000 int 2001 sys___lstat13(l, v, retval) 2002 struct lwp *l; 2003 void *v; 2004 register_t *retval; 2005 { 2006 struct sys___lstat13_args /* { 2007 syscallarg(const char *) path; 2008 syscallarg(struct stat *) ub; 2009 } */ *uap = v; 2010 struct proc *p = l->l_proc; 2011 struct stat sb; 2012 int error; 2013 struct nameidata nd; 2014 2015 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2016 SCARG(uap, path), p); 2017 if ((error = namei(&nd)) != 0) 2018 return (error); 2019 error = vn_stat(nd.ni_vp, &sb, p); 2020 vput(nd.ni_vp); 2021 if (error) 2022 return (error); 2023 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2024 return (error); 2025 } 2026 2027 /* 2028 * Get configurable pathname variables. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys_pathconf(l, v, retval) 2033 struct lwp *l; 2034 void *v; 2035 register_t *retval; 2036 { 2037 struct sys_pathconf_args /* { 2038 syscallarg(const char *) path; 2039 syscallarg(int) name; 2040 } */ *uap = v; 2041 struct proc *p = l->l_proc; 2042 int error; 2043 struct nameidata nd; 2044 2045 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2046 SCARG(uap, path), p); 2047 if ((error = namei(&nd)) != 0) 2048 return (error); 2049 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2050 vput(nd.ni_vp); 2051 return (error); 2052 } 2053 2054 /* 2055 * Return target name of a symbolic link. 2056 */ 2057 /* ARGSUSED */ 2058 int 2059 sys_readlink(l, v, retval) 2060 struct lwp *l; 2061 void *v; 2062 register_t *retval; 2063 { 2064 struct sys_readlink_args /* { 2065 syscallarg(const char *) path; 2066 syscallarg(char *) buf; 2067 syscallarg(size_t) count; 2068 } */ *uap = v; 2069 struct proc *p = l->l_proc; 2070 struct vnode *vp; 2071 struct iovec aiov; 2072 struct uio auio; 2073 int error; 2074 struct nameidata nd; 2075 2076 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2077 SCARG(uap, path), p); 2078 if ((error = namei(&nd)) != 0) 2079 return (error); 2080 vp = nd.ni_vp; 2081 if (vp->v_type != VLNK) 2082 error = EINVAL; 2083 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2084 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2085 aiov.iov_base = SCARG(uap, buf); 2086 aiov.iov_len = SCARG(uap, count); 2087 auio.uio_iov = &aiov; 2088 auio.uio_iovcnt = 1; 2089 auio.uio_offset = 0; 2090 auio.uio_rw = UIO_READ; 2091 auio.uio_segflg = UIO_USERSPACE; 2092 auio.uio_procp = p; 2093 auio.uio_resid = SCARG(uap, count); 2094 error = VOP_READLINK(vp, &auio, p->p_ucred); 2095 } 2096 vput(vp); 2097 *retval = SCARG(uap, count) - auio.uio_resid; 2098 return (error); 2099 } 2100 2101 /* 2102 * Change flags of a file given a path name. 2103 */ 2104 /* ARGSUSED */ 2105 int 2106 sys_chflags(l, v, retval) 2107 struct lwp *l; 2108 void *v; 2109 register_t *retval; 2110 { 2111 struct sys_chflags_args /* { 2112 syscallarg(const char *) path; 2113 syscallarg(u_long) flags; 2114 } */ *uap = v; 2115 struct proc *p = l->l_proc; 2116 struct vnode *vp; 2117 int error; 2118 struct nameidata nd; 2119 2120 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2121 if ((error = namei(&nd)) != 0) 2122 return (error); 2123 vp = nd.ni_vp; 2124 error = change_flags(vp, SCARG(uap, flags), p); 2125 vput(vp); 2126 return (error); 2127 } 2128 2129 /* 2130 * Change flags of a file given a file descriptor. 2131 */ 2132 /* ARGSUSED */ 2133 int 2134 sys_fchflags(l, v, retval) 2135 struct lwp *l; 2136 void *v; 2137 register_t *retval; 2138 { 2139 struct sys_fchflags_args /* { 2140 syscallarg(int) fd; 2141 syscallarg(u_long) flags; 2142 } */ *uap = v; 2143 struct proc *p = l->l_proc; 2144 struct vnode *vp; 2145 struct file *fp; 2146 int error; 2147 2148 /* getvnode() will use the descriptor for us */ 2149 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2150 return (error); 2151 vp = (struct vnode *)fp->f_data; 2152 error = change_flags(vp, SCARG(uap, flags), p); 2153 VOP_UNLOCK(vp, 0); 2154 FILE_UNUSE(fp, p); 2155 return (error); 2156 } 2157 2158 /* 2159 * Change flags of a file given a path name; this version does 2160 * not follow links. 2161 */ 2162 int 2163 sys_lchflags(l, v, retval) 2164 struct lwp *l; 2165 void *v; 2166 register_t *retval; 2167 { 2168 struct sys_lchflags_args /* { 2169 syscallarg(const char *) path; 2170 syscallarg(u_long) flags; 2171 } */ *uap = v; 2172 struct proc *p = l->l_proc; 2173 struct vnode *vp; 2174 int error; 2175 struct nameidata nd; 2176 2177 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2178 if ((error = namei(&nd)) != 0) 2179 return (error); 2180 vp = nd.ni_vp; 2181 error = change_flags(vp, SCARG(uap, flags), p); 2182 vput(vp); 2183 return (error); 2184 } 2185 2186 /* 2187 * Common routine to change flags of a file. 2188 */ 2189 int 2190 change_flags(vp, flags, p) 2191 struct vnode *vp; 2192 u_long flags; 2193 struct proc *p; 2194 { 2195 struct vattr vattr; 2196 int error; 2197 2198 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2199 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2200 /* 2201 * Non-superusers cannot change the flags on devices, even if they 2202 * own them. 2203 */ 2204 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2205 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2206 goto out; 2207 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2208 error = EINVAL; 2209 goto out; 2210 } 2211 } 2212 VATTR_NULL(&vattr); 2213 vattr.va_flags = flags; 2214 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2215 out: 2216 return (error); 2217 } 2218 2219 /* 2220 * Change mode of a file given path name; this version follows links. 2221 */ 2222 /* ARGSUSED */ 2223 int 2224 sys_chmod(l, v, retval) 2225 struct lwp *l; 2226 void *v; 2227 register_t *retval; 2228 { 2229 struct sys_chmod_args /* { 2230 syscallarg(const char *) path; 2231 syscallarg(int) mode; 2232 } */ *uap = v; 2233 struct proc *p = l->l_proc; 2234 int error; 2235 struct nameidata nd; 2236 2237 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2238 if ((error = namei(&nd)) != 0) 2239 return (error); 2240 2241 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2242 2243 vrele(nd.ni_vp); 2244 return (error); 2245 } 2246 2247 /* 2248 * Change mode of a file given a file descriptor. 2249 */ 2250 /* ARGSUSED */ 2251 int 2252 sys_fchmod(l, v, retval) 2253 struct lwp *l; 2254 void *v; 2255 register_t *retval; 2256 { 2257 struct sys_fchmod_args /* { 2258 syscallarg(int) fd; 2259 syscallarg(int) mode; 2260 } */ *uap = v; 2261 struct proc *p = l->l_proc; 2262 struct file *fp; 2263 int error; 2264 2265 /* getvnode() will use the descriptor for us */ 2266 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2267 return (error); 2268 2269 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2270 FILE_UNUSE(fp, p); 2271 return (error); 2272 } 2273 2274 /* 2275 * Change mode of a file given path name; this version does not follow links. 2276 */ 2277 /* ARGSUSED */ 2278 int 2279 sys_lchmod(l, v, retval) 2280 struct lwp *l; 2281 void *v; 2282 register_t *retval; 2283 { 2284 struct sys_lchmod_args /* { 2285 syscallarg(const char *) path; 2286 syscallarg(int) mode; 2287 } */ *uap = v; 2288 struct proc *p = l->l_proc; 2289 int error; 2290 struct nameidata nd; 2291 2292 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2293 if ((error = namei(&nd)) != 0) 2294 return (error); 2295 2296 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2297 2298 vrele(nd.ni_vp); 2299 return (error); 2300 } 2301 2302 /* 2303 * Common routine to set mode given a vnode. 2304 */ 2305 static int 2306 change_mode(vp, mode, p) 2307 struct vnode *vp; 2308 int mode; 2309 struct proc *p; 2310 { 2311 struct vattr vattr; 2312 int error; 2313 2314 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2315 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2316 VATTR_NULL(&vattr); 2317 vattr.va_mode = mode & ALLPERMS; 2318 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2319 VOP_UNLOCK(vp, 0); 2320 return (error); 2321 } 2322 2323 /* 2324 * Set ownership given a path name; this version follows links. 2325 */ 2326 /* ARGSUSED */ 2327 int 2328 sys_chown(l, v, retval) 2329 struct lwp *l; 2330 void *v; 2331 register_t *retval; 2332 { 2333 struct sys_chown_args /* { 2334 syscallarg(const char *) path; 2335 syscallarg(uid_t) uid; 2336 syscallarg(gid_t) gid; 2337 } */ *uap = v; 2338 struct proc *p = l->l_proc; 2339 int error; 2340 struct nameidata nd; 2341 2342 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2343 if ((error = namei(&nd)) != 0) 2344 return (error); 2345 2346 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2347 2348 vrele(nd.ni_vp); 2349 return (error); 2350 } 2351 2352 /* 2353 * Set ownership given a path name; this version follows links. 2354 * Provides POSIX semantics. 2355 */ 2356 /* ARGSUSED */ 2357 int 2358 sys___posix_chown(l, v, retval) 2359 struct lwp *l; 2360 void *v; 2361 register_t *retval; 2362 { 2363 struct sys_chown_args /* { 2364 syscallarg(const char *) path; 2365 syscallarg(uid_t) uid; 2366 syscallarg(gid_t) gid; 2367 } */ *uap = v; 2368 struct proc *p = l->l_proc; 2369 int error; 2370 struct nameidata nd; 2371 2372 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2373 if ((error = namei(&nd)) != 0) 2374 return (error); 2375 2376 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2377 2378 vrele(nd.ni_vp); 2379 return (error); 2380 } 2381 2382 /* 2383 * Set ownership given a file descriptor. 2384 */ 2385 /* ARGSUSED */ 2386 int 2387 sys_fchown(l, v, retval) 2388 struct lwp *l; 2389 void *v; 2390 register_t *retval; 2391 { 2392 struct sys_fchown_args /* { 2393 syscallarg(int) fd; 2394 syscallarg(uid_t) uid; 2395 syscallarg(gid_t) gid; 2396 } */ *uap = v; 2397 struct proc *p = l->l_proc; 2398 int error; 2399 struct file *fp; 2400 2401 /* getvnode() will use the descriptor for us */ 2402 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2403 return (error); 2404 2405 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2406 SCARG(uap, gid), p, 0); 2407 FILE_UNUSE(fp, p); 2408 return (error); 2409 } 2410 2411 /* 2412 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2413 */ 2414 /* ARGSUSED */ 2415 int 2416 sys___posix_fchown(l, v, retval) 2417 struct lwp *l; 2418 void *v; 2419 register_t *retval; 2420 { 2421 struct sys_fchown_args /* { 2422 syscallarg(int) fd; 2423 syscallarg(uid_t) uid; 2424 syscallarg(gid_t) gid; 2425 } */ *uap = v; 2426 struct proc *p = l->l_proc; 2427 int error; 2428 struct file *fp; 2429 2430 /* getvnode() will use the descriptor for us */ 2431 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2432 return (error); 2433 2434 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2435 SCARG(uap, gid), p, 1); 2436 FILE_UNUSE(fp, p); 2437 return (error); 2438 } 2439 2440 /* 2441 * Set ownership given a path name; this version does not follow links. 2442 */ 2443 /* ARGSUSED */ 2444 int 2445 sys_lchown(l, v, retval) 2446 struct lwp *l; 2447 void *v; 2448 register_t *retval; 2449 { 2450 struct sys_lchown_args /* { 2451 syscallarg(const char *) path; 2452 syscallarg(uid_t) uid; 2453 syscallarg(gid_t) gid; 2454 } */ *uap = v; 2455 struct proc *p = l->l_proc; 2456 int error; 2457 struct nameidata nd; 2458 2459 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2460 if ((error = namei(&nd)) != 0) 2461 return (error); 2462 2463 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2464 2465 vrele(nd.ni_vp); 2466 return (error); 2467 } 2468 2469 /* 2470 * Set ownership given a path name; this version does not follow links. 2471 * Provides POSIX/XPG semantics. 2472 */ 2473 /* ARGSUSED */ 2474 int 2475 sys___posix_lchown(l, v, retval) 2476 struct lwp *l; 2477 void *v; 2478 register_t *retval; 2479 { 2480 struct sys_lchown_args /* { 2481 syscallarg(const char *) path; 2482 syscallarg(uid_t) uid; 2483 syscallarg(gid_t) gid; 2484 } */ *uap = v; 2485 struct proc *p = l->l_proc; 2486 int error; 2487 struct nameidata nd; 2488 2489 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2490 if ((error = namei(&nd)) != 0) 2491 return (error); 2492 2493 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2494 2495 vrele(nd.ni_vp); 2496 return (error); 2497 } 2498 2499 /* 2500 * Common routine to set ownership given a vnode. 2501 */ 2502 static int 2503 change_owner(vp, uid, gid, p, posix_semantics) 2504 struct vnode *vp; 2505 uid_t uid; 2506 gid_t gid; 2507 struct proc *p; 2508 int posix_semantics; 2509 { 2510 struct vattr vattr; 2511 mode_t newmode; 2512 int error; 2513 2514 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2515 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2516 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2517 goto out; 2518 2519 #define CHANGED(x) ((x) != -1) 2520 newmode = vattr.va_mode; 2521 if (posix_semantics) { 2522 /* 2523 * POSIX/XPG semantics: if the caller is not the super-user, 2524 * clear set-user-id and set-group-id bits. Both POSIX and 2525 * the XPG consider the behaviour for calls by the super-user 2526 * implementation-defined; we leave the set-user-id and set- 2527 * group-id settings intact in that case. 2528 */ 2529 if (suser(p->p_ucred, NULL) != 0) 2530 newmode &= ~(S_ISUID | S_ISGID); 2531 } else { 2532 /* 2533 * NetBSD semantics: when changing owner and/or group, 2534 * clear the respective bit(s). 2535 */ 2536 if (CHANGED(uid)) 2537 newmode &= ~S_ISUID; 2538 if (CHANGED(gid)) 2539 newmode &= ~S_ISGID; 2540 } 2541 /* Update va_mode iff altered. */ 2542 if (vattr.va_mode == newmode) 2543 newmode = VNOVAL; 2544 2545 VATTR_NULL(&vattr); 2546 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2547 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2548 vattr.va_mode = newmode; 2549 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2550 #undef CHANGED 2551 2552 out: 2553 VOP_UNLOCK(vp, 0); 2554 return (error); 2555 } 2556 2557 /* 2558 * Set the access and modification times given a path name; this 2559 * version follows links. 2560 */ 2561 /* ARGSUSED */ 2562 int 2563 sys_utimes(l, v, retval) 2564 struct lwp *l; 2565 void *v; 2566 register_t *retval; 2567 { 2568 struct sys_utimes_args /* { 2569 syscallarg(const char *) path; 2570 syscallarg(const struct timeval *) tptr; 2571 } */ *uap = v; 2572 struct proc *p = l->l_proc; 2573 int error; 2574 struct nameidata nd; 2575 2576 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2577 if ((error = namei(&nd)) != 0) 2578 return (error); 2579 2580 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2581 2582 vrele(nd.ni_vp); 2583 return (error); 2584 } 2585 2586 /* 2587 * Set the access and modification times given a file descriptor. 2588 */ 2589 /* ARGSUSED */ 2590 int 2591 sys_futimes(l, v, retval) 2592 struct lwp *l; 2593 void *v; 2594 register_t *retval; 2595 { 2596 struct sys_futimes_args /* { 2597 syscallarg(int) fd; 2598 syscallarg(const struct timeval *) tptr; 2599 } */ *uap = v; 2600 struct proc *p = l->l_proc; 2601 int error; 2602 struct file *fp; 2603 2604 /* getvnode() will use the descriptor for us */ 2605 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2606 return (error); 2607 2608 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2609 FILE_UNUSE(fp, p); 2610 return (error); 2611 } 2612 2613 /* 2614 * Set the access and modification times given a path name; this 2615 * version does not follow links. 2616 */ 2617 /* ARGSUSED */ 2618 int 2619 sys_lutimes(l, v, retval) 2620 struct lwp *l; 2621 void *v; 2622 register_t *retval; 2623 { 2624 struct sys_lutimes_args /* { 2625 syscallarg(const char *) path; 2626 syscallarg(const struct timeval *) tptr; 2627 } */ *uap = v; 2628 struct proc *p = l->l_proc; 2629 int error; 2630 struct nameidata nd; 2631 2632 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2633 if ((error = namei(&nd)) != 0) 2634 return (error); 2635 2636 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2637 2638 vrele(nd.ni_vp); 2639 return (error); 2640 } 2641 2642 /* 2643 * Common routine to set access and modification times given a vnode. 2644 */ 2645 static int 2646 change_utimes(vp, tptr, p) 2647 struct vnode *vp; 2648 const struct timeval *tptr; 2649 struct proc *p; 2650 { 2651 struct timeval tv[2]; 2652 struct vattr vattr; 2653 int error; 2654 2655 VATTR_NULL(&vattr); 2656 if (tptr == NULL) { 2657 microtime(&tv[0]); 2658 tv[1] = tv[0]; 2659 vattr.va_vaflags |= VA_UTIMES_NULL; 2660 } else { 2661 error = copyin(tptr, tv, sizeof(tv)); 2662 if (error) 2663 return (error); 2664 } 2665 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2666 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2667 vattr.va_atime.tv_sec = tv[0].tv_sec; 2668 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2669 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2670 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2671 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2672 VOP_UNLOCK(vp, 0); 2673 return (error); 2674 } 2675 2676 /* 2677 * Truncate a file given its path name. 2678 */ 2679 /* ARGSUSED */ 2680 int 2681 sys_truncate(l, v, retval) 2682 struct lwp *l; 2683 void *v; 2684 register_t *retval; 2685 { 2686 struct sys_truncate_args /* { 2687 syscallarg(const char *) path; 2688 syscallarg(int) pad; 2689 syscallarg(off_t) length; 2690 } */ *uap = v; 2691 struct proc *p = l->l_proc; 2692 struct vnode *vp; 2693 struct vattr vattr; 2694 int error; 2695 struct nameidata nd; 2696 2697 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2698 if ((error = namei(&nd)) != 0) 2699 return (error); 2700 vp = nd.ni_vp; 2701 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2702 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2703 if (vp->v_type == VDIR) 2704 error = EISDIR; 2705 else if ((error = vn_writechk(vp)) == 0 && 2706 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2707 VATTR_NULL(&vattr); 2708 vattr.va_size = SCARG(uap, length); 2709 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2710 } 2711 vput(vp); 2712 return (error); 2713 } 2714 2715 /* 2716 * Truncate a file given a file descriptor. 2717 */ 2718 /* ARGSUSED */ 2719 int 2720 sys_ftruncate(l, v, retval) 2721 struct lwp *l; 2722 void *v; 2723 register_t *retval; 2724 { 2725 struct sys_ftruncate_args /* { 2726 syscallarg(int) fd; 2727 syscallarg(int) pad; 2728 syscallarg(off_t) length; 2729 } */ *uap = v; 2730 struct proc *p = l->l_proc; 2731 struct vattr vattr; 2732 struct vnode *vp; 2733 struct file *fp; 2734 int error; 2735 2736 /* getvnode() will use the descriptor for us */ 2737 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2738 return (error); 2739 if ((fp->f_flag & FWRITE) == 0) { 2740 error = EINVAL; 2741 goto out; 2742 } 2743 vp = (struct vnode *)fp->f_data; 2744 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2745 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2746 if (vp->v_type == VDIR) 2747 error = EISDIR; 2748 else if ((error = vn_writechk(vp)) == 0) { 2749 VATTR_NULL(&vattr); 2750 vattr.va_size = SCARG(uap, length); 2751 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2752 } 2753 VOP_UNLOCK(vp, 0); 2754 out: 2755 FILE_UNUSE(fp, p); 2756 return (error); 2757 } 2758 2759 /* 2760 * Sync an open file. 2761 */ 2762 /* ARGSUSED */ 2763 int 2764 sys_fsync(l, v, retval) 2765 struct lwp *l; 2766 void *v; 2767 register_t *retval; 2768 { 2769 struct sys_fsync_args /* { 2770 syscallarg(int) fd; 2771 } */ *uap = v; 2772 struct proc *p = l->l_proc; 2773 struct vnode *vp; 2774 struct file *fp; 2775 int error; 2776 2777 /* getvnode() will use the descriptor for us */ 2778 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2779 return (error); 2780 vp = (struct vnode *)fp->f_data; 2781 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2782 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2783 if (error == 0 && bioops.io_fsync != NULL && 2784 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2785 (*bioops.io_fsync)(vp); 2786 VOP_UNLOCK(vp, 0); 2787 FILE_UNUSE(fp, p); 2788 return (error); 2789 } 2790 2791 /* 2792 * Sync the data of an open file. 2793 */ 2794 /* ARGSUSED */ 2795 int 2796 sys_fdatasync(l, v, retval) 2797 struct lwp *l; 2798 void *v; 2799 register_t *retval; 2800 { 2801 struct sys_fdatasync_args /* { 2802 syscallarg(int) fd; 2803 } */ *uap = v; 2804 struct proc *p = l->l_proc; 2805 struct vnode *vp; 2806 struct file *fp; 2807 int error; 2808 2809 /* getvnode() will use the descriptor for us */ 2810 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2811 return (error); 2812 vp = (struct vnode *)fp->f_data; 2813 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2814 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2815 VOP_UNLOCK(vp, 0); 2816 FILE_UNUSE(fp, p); 2817 return (error); 2818 } 2819 2820 /* 2821 * Rename files, (standard) BSD semantics frontend. 2822 */ 2823 /* ARGSUSED */ 2824 int 2825 sys_rename(l, v, retval) 2826 struct lwp *l; 2827 void *v; 2828 register_t *retval; 2829 { 2830 struct sys_rename_args /* { 2831 syscallarg(const char *) from; 2832 syscallarg(const char *) to; 2833 } */ *uap = v; 2834 struct proc *p = l->l_proc; 2835 2836 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2837 } 2838 2839 /* 2840 * Rename files, POSIX semantics frontend. 2841 */ 2842 /* ARGSUSED */ 2843 int 2844 sys___posix_rename(l, v, retval) 2845 struct lwp *l; 2846 void *v; 2847 register_t *retval; 2848 { 2849 struct sys___posix_rename_args /* { 2850 syscallarg(const char *) from; 2851 syscallarg(const char *) to; 2852 } */ *uap = v; 2853 struct proc *p = l->l_proc; 2854 2855 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2856 } 2857 2858 /* 2859 * Rename files. Source and destination must either both be directories, 2860 * or both not be directories. If target is a directory, it must be empty. 2861 * If `from' and `to' refer to the same object, the value of the `retain' 2862 * argument is used to determine whether `from' will be 2863 * 2864 * (retain == 0) deleted unless `from' and `to' refer to the same 2865 * object in the file system's name space (BSD). 2866 * (retain == 1) always retained (POSIX). 2867 */ 2868 static int 2869 rename_files(from, to, p, retain) 2870 const char *from, *to; 2871 struct proc *p; 2872 int retain; 2873 { 2874 struct vnode *tvp, *fvp, *tdvp; 2875 struct nameidata fromnd, tond; 2876 int error; 2877 2878 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2879 from, p); 2880 if ((error = namei(&fromnd)) != 0) 2881 return (error); 2882 fvp = fromnd.ni_vp; 2883 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2884 UIO_USERSPACE, to, p); 2885 if ((error = namei(&tond)) != 0) { 2886 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2887 vrele(fromnd.ni_dvp); 2888 vrele(fvp); 2889 goto out1; 2890 } 2891 tdvp = tond.ni_dvp; 2892 tvp = tond.ni_vp; 2893 2894 if (tvp != NULL) { 2895 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2896 error = ENOTDIR; 2897 goto out; 2898 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2899 error = EISDIR; 2900 goto out; 2901 } 2902 } 2903 2904 if (fvp == tdvp) 2905 error = EINVAL; 2906 2907 /* 2908 * Source and destination refer to the same object. 2909 */ 2910 if (fvp == tvp) { 2911 if (retain) 2912 error = -1; 2913 else if (fromnd.ni_dvp == tdvp && 2914 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2915 !memcmp(fromnd.ni_cnd.cn_nameptr, 2916 tond.ni_cnd.cn_nameptr, 2917 fromnd.ni_cnd.cn_namelen)) 2918 error = -1; 2919 } 2920 2921 out: 2922 if (!error) { 2923 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2924 if (fromnd.ni_dvp != tdvp) 2925 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2926 if (tvp) { 2927 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2928 } 2929 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2930 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2931 } else { 2932 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2933 if (tdvp == tvp) 2934 vrele(tdvp); 2935 else 2936 vput(tdvp); 2937 if (tvp) 2938 vput(tvp); 2939 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2940 vrele(fromnd.ni_dvp); 2941 vrele(fvp); 2942 } 2943 vrele(tond.ni_startdir); 2944 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2945 out1: 2946 if (fromnd.ni_startdir) 2947 vrele(fromnd.ni_startdir); 2948 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2949 return (error == -1 ? 0 : error); 2950 } 2951 2952 /* 2953 * Make a directory file. 2954 */ 2955 /* ARGSUSED */ 2956 int 2957 sys_mkdir(l, v, retval) 2958 struct lwp *l; 2959 void *v; 2960 register_t *retval; 2961 { 2962 struct sys_mkdir_args /* { 2963 syscallarg(const char *) path; 2964 syscallarg(int) mode; 2965 } */ *uap = v; 2966 struct proc *p = l->l_proc; 2967 struct vnode *vp; 2968 struct vattr vattr; 2969 int error; 2970 struct nameidata nd; 2971 2972 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2973 if ((error = namei(&nd)) != 0) 2974 return (error); 2975 vp = nd.ni_vp; 2976 if (vp != NULL) { 2977 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2978 if (nd.ni_dvp == vp) 2979 vrele(nd.ni_dvp); 2980 else 2981 vput(nd.ni_dvp); 2982 vrele(vp); 2983 return (EEXIST); 2984 } 2985 VATTR_NULL(&vattr); 2986 vattr.va_type = VDIR; 2987 vattr.va_mode = 2988 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2989 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2990 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2991 if (!error) 2992 vput(nd.ni_vp); 2993 return (error); 2994 } 2995 2996 /* 2997 * Remove a directory file. 2998 */ 2999 /* ARGSUSED */ 3000 int 3001 sys_rmdir(l, v, retval) 3002 struct lwp *l; 3003 void *v; 3004 register_t *retval; 3005 { 3006 struct sys_rmdir_args /* { 3007 syscallarg(const char *) path; 3008 } */ *uap = v; 3009 struct proc *p = l->l_proc; 3010 struct vnode *vp; 3011 int error; 3012 struct nameidata nd; 3013 3014 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3015 SCARG(uap, path), p); 3016 if ((error = namei(&nd)) != 0) 3017 return (error); 3018 vp = nd.ni_vp; 3019 if (vp->v_type != VDIR) { 3020 error = ENOTDIR; 3021 goto out; 3022 } 3023 /* 3024 * No rmdir "." please. 3025 */ 3026 if (nd.ni_dvp == vp) { 3027 error = EINVAL; 3028 goto out; 3029 } 3030 /* 3031 * The root of a mounted filesystem cannot be deleted. 3032 */ 3033 if (vp->v_flag & VROOT) 3034 error = EBUSY; 3035 out: 3036 if (!error) { 3037 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3038 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3039 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3040 } else { 3041 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3042 if (nd.ni_dvp == vp) 3043 vrele(nd.ni_dvp); 3044 else 3045 vput(nd.ni_dvp); 3046 vput(vp); 3047 } 3048 return (error); 3049 } 3050 3051 /* 3052 * Read a block of directory entries in a file system independent format. 3053 */ 3054 int 3055 sys_getdents(l, v, retval) 3056 struct lwp *l; 3057 void *v; 3058 register_t *retval; 3059 { 3060 struct sys_getdents_args /* { 3061 syscallarg(int) fd; 3062 syscallarg(char *) buf; 3063 syscallarg(size_t) count; 3064 } */ *uap = v; 3065 struct proc *p = l->l_proc; 3066 struct file *fp; 3067 int error, done; 3068 3069 /* getvnode() will use the descriptor for us */ 3070 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3071 return (error); 3072 if ((fp->f_flag & FREAD) == 0) { 3073 error = EBADF; 3074 goto out; 3075 } 3076 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3077 SCARG(uap, count), &done, p, 0, 0); 3078 *retval = done; 3079 out: 3080 FILE_UNUSE(fp, p); 3081 return (error); 3082 } 3083 3084 /* 3085 * Set the mode mask for creation of filesystem nodes. 3086 */ 3087 int 3088 sys_umask(l, v, retval) 3089 struct lwp *l; 3090 void *v; 3091 register_t *retval; 3092 { 3093 struct sys_umask_args /* { 3094 syscallarg(mode_t) newmask; 3095 } */ *uap = v; 3096 struct proc *p = l->l_proc; 3097 struct cwdinfo *cwdi; 3098 3099 cwdi = p->p_cwdi; 3100 *retval = cwdi->cwdi_cmask; 3101 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3102 return (0); 3103 } 3104 3105 /* 3106 * Void all references to file by ripping underlying filesystem 3107 * away from vnode. 3108 */ 3109 /* ARGSUSED */ 3110 int 3111 sys_revoke(l, v, retval) 3112 struct lwp *l; 3113 void *v; 3114 register_t *retval; 3115 { 3116 struct sys_revoke_args /* { 3117 syscallarg(const char *) path; 3118 } */ *uap = v; 3119 struct proc *p = l->l_proc; 3120 struct vnode *vp; 3121 struct vattr vattr; 3122 int error; 3123 struct nameidata nd; 3124 3125 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3126 if ((error = namei(&nd)) != 0) 3127 return (error); 3128 vp = nd.ni_vp; 3129 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3130 goto out; 3131 if (p->p_ucred->cr_uid != vattr.va_uid && 3132 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3133 goto out; 3134 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3135 VOP_REVOKE(vp, REVOKEALL); 3136 out: 3137 vrele(vp); 3138 return (error); 3139 } 3140 3141 /* 3142 * Convert a user file descriptor to a kernel file entry. 3143 */ 3144 int 3145 getvnode(fdp, fd, fpp) 3146 struct filedesc *fdp; 3147 int fd; 3148 struct file **fpp; 3149 { 3150 struct vnode *vp; 3151 struct file *fp; 3152 3153 if ((fp = fd_getfile(fdp, fd)) == NULL) 3154 return (EBADF); 3155 3156 FILE_USE(fp); 3157 3158 if (fp->f_type != DTYPE_VNODE) { 3159 FILE_UNUSE(fp, NULL); 3160 return (EINVAL); 3161 } 3162 3163 vp = (struct vnode *)fp->f_data; 3164 if (vp->v_type == VBAD) { 3165 FILE_UNUSE(fp, NULL); 3166 return (EBADF); 3167 } 3168 3169 *fpp = fp; 3170 return (0); 3171 } 3172
Indexes created Fri Oct 03 02:09:57 GMT 2025