vfs_syscalls.c revision 1.181
1 /* $NetBSD: vfs_syscalls.c,v 1.181 2003/02/01 06:23:45 thorpej 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 1.181 2003/02/01 06:23:45 thorpej 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 80 void checkdirs __P((struct vnode *)); 81 82 int dovfsusermount = 0; 83 84 /* 85 * Virtual File System System Calls 86 */ 87 88 /* 89 * Mount a file system. 90 */ 91 92 #if defined(COMPAT_09) || defined(COMPAT_43) 93 /* 94 * This table is used to maintain compatibility with 4.3BSD 95 * and NetBSD 0.9 mount syscalls. Note, the order is important! 96 * 97 * Do not modify this table. It should only contain filesystems 98 * supported by NetBSD 0.9 and 4.3BSD. 99 */ 100 const char * const mountcompatnames[] = { 101 NULL, /* 0 = MOUNT_NONE */ 102 MOUNT_FFS, /* 1 = MOUNT_UFS */ 103 MOUNT_NFS, /* 2 */ 104 MOUNT_MFS, /* 3 */ 105 MOUNT_MSDOS, /* 4 */ 106 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 107 MOUNT_FDESC, /* 6 */ 108 MOUNT_KERNFS, /* 7 */ 109 NULL, /* 8 = MOUNT_DEVFS */ 110 MOUNT_AFS, /* 9 */ 111 }; 112 const int nmountcompatnames = sizeof(mountcompatnames) / 113 sizeof(mountcompatnames[0]); 114 #endif /* COMPAT_09 || COMPAT_43 */ 115 116 /* ARGSUSED */ 117 int 118 sys_mount(l, v, retval) 119 struct lwp *l; 120 void *v; 121 register_t *retval; 122 { 123 struct sys_mount_args /* { 124 syscallarg(const char *) type; 125 syscallarg(const char *) path; 126 syscallarg(int) flags; 127 syscallarg(void *) data; 128 } */ *uap = v; 129 struct proc *p = l->l_proc; 130 struct vnode *vp; 131 struct mount *mp; 132 int error, flag = 0; 133 char fstypename[MFSNAMELEN]; 134 struct vattr va; 135 struct nameidata nd; 136 struct vfsops *vfs; 137 138 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 139 (error = suser(p->p_ucred, &p->p_acflag))) 140 return (error); 141 /* 142 * Get vnode to be covered 143 */ 144 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 145 SCARG(uap, path), p); 146 if ((error = namei(&nd)) != 0) 147 return (error); 148 vp = nd.ni_vp; 149 /* 150 * A lookup in VFS_MOUNT might result in an attempt to 151 * lock this vnode again, so make the lock resursive. 152 */ 153 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 154 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 155 if ((vp->v_flag & VROOT) == 0) { 156 vput(vp); 157 return (EINVAL); 158 } 159 mp = vp->v_mount; 160 flag = mp->mnt_flag; 161 vfs = mp->mnt_op; 162 /* 163 * We only allow the filesystem to be reloaded if it 164 * is currently mounted read-only. 165 */ 166 if ((SCARG(uap, flags) & MNT_RELOAD) && 167 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 168 vput(vp); 169 return (EOPNOTSUPP); /* Needs translation */ 170 } 171 /* 172 * In "highly secure" mode, don't let the caller do anything 173 * but downgrade a filesystem from read-write to read-only. 174 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 175 */ 176 if (securelevel >= 2 && 177 SCARG(uap, flags) != MNT_GETARGS && 178 SCARG(uap, flags) != 179 (mp->mnt_flag | MNT_RDONLY | 180 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 181 vput(vp); 182 return (EPERM); 183 } 184 mp->mnt_flag |= SCARG(uap, flags) & 185 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 186 /* 187 * Only root, or the user that did the original mount is 188 * permitted to update it. 189 */ 190 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 191 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 192 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 193 vput(vp); 194 return (error); 195 } 196 /* 197 * Do not allow NFS export by non-root users. For non-root 198 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 199 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 200 */ 201 if (p->p_ucred->cr_uid != 0) { 202 if (SCARG(uap, flags) & MNT_EXPORTED) { 203 vput(vp); 204 return (EPERM); 205 } 206 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 207 if (flag & MNT_NOEXEC) 208 SCARG(uap, flags) |= MNT_NOEXEC; 209 } 210 if (vfs_busy(mp, LK_NOWAIT, 0)) { 211 vput(vp); 212 return (EPERM); 213 } 214 goto update; 215 } else { 216 if (securelevel >= 2) { 217 vput(vp); 218 return (EPERM); 219 } 220 } 221 /* 222 * If the user is not root, ensure that they own the directory 223 * onto which we are attempting to mount. 224 */ 225 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 226 (va.va_uid != p->p_ucred->cr_uid && 227 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 228 vput(vp); 229 return (error); 230 } 231 /* 232 * Do not allow NFS export by non-root users. For non-root users, 233 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 234 * mount point is already MNT_NOEXEC. 235 */ 236 if (p->p_ucred->cr_uid != 0) { 237 if (SCARG(uap, flags) & MNT_EXPORTED) { 238 vput(vp); 239 return (EPERM); 240 } 241 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 242 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 243 SCARG(uap, flags) |= MNT_NOEXEC; 244 } 245 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 246 return (error); 247 if (vp->v_type != VDIR) { 248 vput(vp); 249 return (ENOTDIR); 250 } 251 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 252 if (error) { 253 #if defined(COMPAT_09) || defined(COMPAT_43) 254 /* 255 * Historically filesystem types were identified by number. 256 * If we get an integer for the filesystem type instead of a 257 * string, we check to see if it matches one of the historic 258 * filesystem types. 259 */ 260 u_long fsindex = (u_long)SCARG(uap, type); 261 if (fsindex >= nmountcompatnames || 262 mountcompatnames[fsindex] == NULL) { 263 vput(vp); 264 return (ENODEV); 265 } 266 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 267 #else 268 vput(vp); 269 return (error); 270 #endif 271 } 272 #ifdef COMPAT_10 273 /* Accept `ufs' as an alias for `ffs'. */ 274 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 275 strncpy(fstypename, "ffs", MFSNAMELEN); 276 #endif 277 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 278 vput(vp); 279 return (ENODEV); 280 } 281 if (vp->v_mountedhere != NULL) { 282 vput(vp); 283 return (EBUSY); 284 } 285 286 /* 287 * Allocate and initialize the file system. 288 */ 289 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 290 M_MOUNT, M_WAITOK); 291 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 292 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 293 (void)vfs_busy(mp, LK_NOWAIT, 0); 294 mp->mnt_op = vfs; 295 vfs->vfs_refcount++; 296 mp->mnt_vnodecovered = vp; 297 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 298 mp->mnt_unmounter = NULL; 299 update: 300 /* 301 * Set the mount level flags. 302 */ 303 if (SCARG(uap, flags) & MNT_RDONLY) 304 mp->mnt_flag |= MNT_RDONLY; 305 else if (mp->mnt_flag & MNT_RDONLY) 306 mp->mnt_flag |= MNT_WANTRDWR; 307 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 308 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 309 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 310 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 311 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 312 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 313 MNT_SYMPERM | MNT_SOFTDEP); 314 /* 315 * Mount the filesystem. 316 */ 317 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 318 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 319 if (mp->mnt_flag & MNT_WANTRDWR) 320 mp->mnt_flag &= ~MNT_RDONLY; 321 if (error || (mp->mnt_flag & MNT_GETARGS)) 322 mp->mnt_flag = flag; 323 mp->mnt_flag &=~ 324 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR | 325 MNT_GETARGS); 326 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 327 if (mp->mnt_syncer == NULL) 328 error = vfs_allocate_syncvnode(mp); 329 } else { 330 if (mp->mnt_syncer != NULL) 331 vfs_deallocate_syncvnode(mp); 332 } 333 vfs_unbusy(mp); 334 VOP_UNLOCK(vp, 0); 335 vrele(vp); 336 return (error); 337 } 338 /* 339 * Put the new filesystem on the mount list after root. 340 */ 341 cache_purge(vp); 342 if (!error) { 343 vp->v_mountedhere = mp; 344 simple_lock(&mountlist_slock); 345 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 346 simple_unlock(&mountlist_slock); 347 checkdirs(vp); 348 VOP_UNLOCK(vp, 0); 349 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 350 error = vfs_allocate_syncvnode(mp); 351 vfs_unbusy(mp); 352 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 353 if ((error = VFS_START(mp, 0, p))) 354 vrele(vp); 355 } else { 356 vp->v_mountedhere = (struct mount *)0; 357 vfs->vfs_refcount--; 358 vfs_unbusy(mp); 359 free((caddr_t)mp, M_MOUNT); 360 vput(vp); 361 } 362 return (error); 363 } 364 365 /* 366 * Scan all active processes to see if any of them have a current 367 * or root directory onto which the new filesystem has just been 368 * mounted. If so, replace them with the new mount point. 369 */ 370 void 371 checkdirs(olddp) 372 struct vnode *olddp; 373 { 374 struct cwdinfo *cwdi; 375 struct vnode *newdp; 376 struct proc *p; 377 378 if (olddp->v_usecount == 1) 379 return; 380 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 381 panic("mount: lost mount"); 382 proclist_lock_read(); 383 LIST_FOREACH(p, &allproc, p_list) { 384 cwdi = p->p_cwdi; 385 if (cwdi->cwdi_cdir == olddp) { 386 vrele(cwdi->cwdi_cdir); 387 VREF(newdp); 388 cwdi->cwdi_cdir = newdp; 389 } 390 if (cwdi->cwdi_rdir == olddp) { 391 vrele(cwdi->cwdi_rdir); 392 VREF(newdp); 393 cwdi->cwdi_rdir = newdp; 394 } 395 } 396 proclist_unlock_read(); 397 if (rootvnode == olddp) { 398 vrele(rootvnode); 399 VREF(newdp); 400 rootvnode = newdp; 401 } 402 vput(newdp); 403 } 404 405 /* 406 * Unmount a file system. 407 * 408 * Note: unmount takes a path to the vnode mounted on as argument, 409 * not special file (as before). 410 */ 411 /* ARGSUSED */ 412 int 413 sys_unmount(l, v, retval) 414 struct lwp *l; 415 void *v; 416 register_t *retval; 417 { 418 struct sys_unmount_args /* { 419 syscallarg(const char *) path; 420 syscallarg(int) flags; 421 } */ *uap = v; 422 struct proc *p = l->l_proc; 423 struct vnode *vp; 424 struct mount *mp; 425 int error; 426 struct nameidata nd; 427 428 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 429 SCARG(uap, path), p); 430 if ((error = namei(&nd)) != 0) 431 return (error); 432 vp = nd.ni_vp; 433 mp = vp->v_mount; 434 435 /* 436 * Only root, or the user that did the original mount is 437 * permitted to unmount this filesystem. 438 */ 439 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 440 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 441 vput(vp); 442 return (error); 443 } 444 445 /* 446 * Don't allow unmounting the root file system. 447 */ 448 if (mp->mnt_flag & MNT_ROOTFS) { 449 vput(vp); 450 return (EINVAL); 451 } 452 453 /* 454 * Must be the root of the filesystem 455 */ 456 if ((vp->v_flag & VROOT) == 0) { 457 vput(vp); 458 return (EINVAL); 459 } 460 vput(vp); 461 462 /* 463 * XXX Freeze syncer. Must do this before locking the 464 * mount point. See dounmount() for details. 465 */ 466 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 467 468 if (vfs_busy(mp, 0, 0)) { 469 lockmgr(&syncer_lock, LK_RELEASE, NULL); 470 return (EBUSY); 471 } 472 473 return (dounmount(mp, SCARG(uap, flags), p)); 474 } 475 476 /* 477 * Do the actual file system unmount. File system is assumed to have been 478 * marked busy by the caller. 479 */ 480 int 481 dounmount(mp, flags, p) 482 struct mount *mp; 483 int flags; 484 struct proc *p; 485 { 486 struct vnode *coveredvp; 487 int error; 488 int async; 489 int used_syncer; 490 491 simple_lock(&mountlist_slock); 492 vfs_unbusy(mp); 493 used_syncer = (mp->mnt_syncer != NULL); 494 495 /* 496 * XXX Syncer must be frozen when we get here. This should really 497 * be done on a per-mountpoint basis, but especially the softdep 498 * code possibly called from the syncer doens't exactly work on a 499 * per-mountpoint basis, so the softdep code would become a maze 500 * of vfs_busy() calls. 501 * 502 * The caller of dounmount() must acquire syncer_lock because 503 * the syncer itself acquires locks in syncer_lock -> vfs_busy 504 * order, and we must preserve that order to avoid deadlock. 505 * 506 * So, if the file system did not use the syncer, now is 507 * the time to release the syncer_lock. 508 */ 509 if (used_syncer == 0) 510 lockmgr(&syncer_lock, LK_RELEASE, NULL); 511 512 mp->mnt_flag |= MNT_UNMOUNT; 513 mp->mnt_unmounter = p; 514 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 515 if (mp->mnt_flag & MNT_EXPUBLIC) 516 vfs_setpublicfs(NULL, NULL, NULL); 517 async = mp->mnt_flag & MNT_ASYNC; 518 mp->mnt_flag &= ~MNT_ASYNC; 519 cache_purgevfs(mp); /* remove cache entries for this file sys */ 520 if (mp->mnt_syncer != NULL) 521 vfs_deallocate_syncvnode(mp); 522 if (((mp->mnt_flag & MNT_RDONLY) || 523 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 524 (flags & MNT_FORCE)) 525 error = VFS_UNMOUNT(mp, flags, p); 526 simple_lock(&mountlist_slock); 527 if (error) { 528 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 529 (void) vfs_allocate_syncvnode(mp); 530 mp->mnt_flag &= ~MNT_UNMOUNT; 531 mp->mnt_unmounter = NULL; 532 mp->mnt_flag |= async; 533 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 534 &mountlist_slock); 535 if (used_syncer) 536 lockmgr(&syncer_lock, LK_RELEASE, NULL); 537 while (mp->mnt_wcnt > 0) { 538 wakeup((caddr_t)mp); 539 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 540 } 541 return (error); 542 } 543 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 544 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 545 coveredvp->v_mountedhere = NULL; 546 vrele(coveredvp); 547 } 548 mp->mnt_op->vfs_refcount--; 549 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 550 panic("unmount: dangling vnode"); 551 mp->mnt_flag |= MNT_GONE; 552 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 553 if (used_syncer) 554 lockmgr(&syncer_lock, LK_RELEASE, NULL); 555 while(mp->mnt_wcnt > 0) { 556 wakeup((caddr_t)mp); 557 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 558 } 559 free((caddr_t)mp, M_MOUNT); 560 return (0); 561 } 562 563 /* 564 * Sync each mounted filesystem. 565 */ 566 #ifdef DEBUG 567 int syncprt = 0; 568 struct ctldebug debug0 = { "syncprt", &syncprt }; 569 #endif 570 571 /* ARGSUSED */ 572 int 573 sys_sync(l, v, retval) 574 struct lwp *l; 575 void *v; 576 register_t *retval; 577 { 578 struct mount *mp, *nmp; 579 int asyncflag; 580 struct proc *p = l == NULL ? &proc0 : l->l_proc; 581 582 simple_lock(&mountlist_slock); 583 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 584 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 585 nmp = mp->mnt_list.cqe_prev; 586 continue; 587 } 588 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 589 asyncflag = mp->mnt_flag & MNT_ASYNC; 590 mp->mnt_flag &= ~MNT_ASYNC; 591 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 592 if (asyncflag) 593 mp->mnt_flag |= MNT_ASYNC; 594 } 595 simple_lock(&mountlist_slock); 596 nmp = mp->mnt_list.cqe_prev; 597 vfs_unbusy(mp); 598 599 } 600 simple_unlock(&mountlist_slock); 601 #ifdef DEBUG 602 if (syncprt) 603 vfs_bufstats(); 604 #endif /* DEBUG */ 605 return (0); 606 } 607 608 /* 609 * Change filesystem quotas. 610 */ 611 /* ARGSUSED */ 612 int 613 sys_quotactl(l, v, retval) 614 struct lwp *l; 615 void *v; 616 register_t *retval; 617 { 618 struct sys_quotactl_args /* { 619 syscallarg(const char *) path; 620 syscallarg(int) cmd; 621 syscallarg(int) uid; 622 syscallarg(caddr_t) arg; 623 } */ *uap = v; 624 struct proc *p = l->l_proc; 625 struct mount *mp; 626 int error; 627 struct nameidata nd; 628 629 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 630 if ((error = namei(&nd)) != 0) 631 return (error); 632 mp = nd.ni_vp->v_mount; 633 vrele(nd.ni_vp); 634 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 635 SCARG(uap, arg), p)); 636 } 637 638 /* 639 * Get filesystem statistics. 640 */ 641 /* ARGSUSED */ 642 int 643 sys_statfs(l, v, retval) 644 struct lwp *l; 645 void *v; 646 register_t *retval; 647 { 648 struct sys_statfs_args /* { 649 syscallarg(const char *) path; 650 syscallarg(struct statfs *) buf; 651 } */ *uap = v; 652 struct proc *p = l->l_proc; 653 struct mount *mp; 654 struct statfs *sp; 655 int error; 656 struct nameidata nd; 657 658 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 659 if ((error = namei(&nd)) != 0) 660 return (error); 661 mp = nd.ni_vp->v_mount; 662 sp = &mp->mnt_stat; 663 vrele(nd.ni_vp); 664 if ((error = VFS_STATFS(mp, sp, p)) != 0) 665 return (error); 666 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 667 sp->f_oflags = sp->f_flags & 0xffff; 668 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 669 } 670 671 /* 672 * Get filesystem statistics. 673 */ 674 /* ARGSUSED */ 675 int 676 sys_fstatfs(l, v, retval) 677 struct lwp *l; 678 void *v; 679 register_t *retval; 680 { 681 struct sys_fstatfs_args /* { 682 syscallarg(int) fd; 683 syscallarg(struct statfs *) buf; 684 } */ *uap = v; 685 struct proc *p = l->l_proc; 686 struct file *fp; 687 struct mount *mp; 688 struct statfs *sp; 689 int error; 690 691 /* getvnode() will use the descriptor for us */ 692 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 693 return (error); 694 mp = ((struct vnode *)fp->f_data)->v_mount; 695 sp = &mp->mnt_stat; 696 if ((error = VFS_STATFS(mp, sp, p)) != 0) 697 goto out; 698 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 699 sp->f_oflags = sp->f_flags & 0xffff; 700 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 701 out: 702 FILE_UNUSE(fp, p); 703 return (error); 704 } 705 706 /* 707 * Get statistics on all filesystems. 708 */ 709 int 710 sys_getfsstat(l, v, retval) 711 struct lwp *l; 712 void *v; 713 register_t *retval; 714 { 715 struct sys_getfsstat_args /* { 716 syscallarg(struct statfs *) buf; 717 syscallarg(long) bufsize; 718 syscallarg(int) flags; 719 } */ *uap = v; 720 struct proc *p = l->l_proc; 721 struct mount *mp, *nmp; 722 struct statfs *sp; 723 caddr_t sfsp; 724 long count, maxcount, error; 725 726 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 727 sfsp = (caddr_t)SCARG(uap, buf); 728 simple_lock(&mountlist_slock); 729 count = 0; 730 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 731 mp = nmp) { 732 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 733 nmp = CIRCLEQ_NEXT(mp, mnt_list); 734 continue; 735 } 736 if (sfsp && count < maxcount) { 737 sp = &mp->mnt_stat; 738 /* 739 * If MNT_NOWAIT or MNT_LAZY is specified, do not 740 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 741 * overrides MNT_NOWAIT. 742 */ 743 if (SCARG(uap, flags) != MNT_NOWAIT && 744 SCARG(uap, flags) != MNT_LAZY && 745 (SCARG(uap, flags) == MNT_WAIT || 746 SCARG(uap, flags) == 0) && 747 (error = VFS_STATFS(mp, sp, p)) != 0) { 748 simple_lock(&mountlist_slock); 749 nmp = CIRCLEQ_NEXT(mp, mnt_list); 750 vfs_unbusy(mp); 751 continue; 752 } 753 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 754 sp->f_oflags = sp->f_flags & 0xffff; 755 error = copyout(sp, sfsp, sizeof(*sp)); 756 if (error) { 757 vfs_unbusy(mp); 758 return (error); 759 } 760 sfsp += sizeof(*sp); 761 } 762 count++; 763 simple_lock(&mountlist_slock); 764 nmp = CIRCLEQ_NEXT(mp, mnt_list); 765 vfs_unbusy(mp); 766 } 767 simple_unlock(&mountlist_slock); 768 if (sfsp && count > maxcount) 769 *retval = maxcount; 770 else 771 *retval = count; 772 return (0); 773 } 774 775 /* 776 * Change current working directory to a given file descriptor. 777 */ 778 /* ARGSUSED */ 779 int 780 sys_fchdir(l, v, retval) 781 struct lwp *l; 782 void *v; 783 register_t *retval; 784 { 785 struct sys_fchdir_args /* { 786 syscallarg(int) fd; 787 } */ *uap = v; 788 struct proc *p = l->l_proc; 789 struct filedesc *fdp = p->p_fd; 790 struct cwdinfo *cwdi = p->p_cwdi; 791 struct vnode *vp, *tdp; 792 struct mount *mp; 793 struct file *fp; 794 int error; 795 796 /* getvnode() will use the descriptor for us */ 797 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 798 return (error); 799 vp = (struct vnode *)fp->f_data; 800 801 VREF(vp); 802 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 803 if (vp->v_type != VDIR) 804 error = ENOTDIR; 805 else 806 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 807 while (!error && (mp = vp->v_mountedhere) != NULL) { 808 if (vfs_busy(mp, 0, 0)) 809 continue; 810 error = VFS_ROOT(mp, &tdp); 811 vfs_unbusy(mp); 812 if (error) 813 break; 814 vput(vp); 815 vp = tdp; 816 } 817 if (error) { 818 vput(vp); 819 goto out; 820 } 821 VOP_UNLOCK(vp, 0); 822 823 /* 824 * Disallow changing to a directory not under the process's 825 * current root directory (if there is one). 826 */ 827 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 828 vrele(vp); 829 error = EPERM; /* operation not permitted */ 830 goto out; 831 } 832 833 vrele(cwdi->cwdi_cdir); 834 cwdi->cwdi_cdir = vp; 835 out: 836 FILE_UNUSE(fp, p); 837 return (error); 838 } 839 840 /* 841 * Change this process's notion of the root directory to a given file descriptor. 842 */ 843 844 int 845 sys_fchroot(l, v, retval) 846 struct lwp *l; 847 void *v; 848 register_t *retval; 849 { 850 struct sys_fchroot_args *uap = v; 851 struct proc *p = l->l_proc; 852 struct filedesc *fdp = p->p_fd; 853 struct cwdinfo *cwdi = p->p_cwdi; 854 struct vnode *vp; 855 struct file *fp; 856 int error; 857 858 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 859 return error; 860 /* getvnode() will use the descriptor for us */ 861 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 862 return error; 863 vp = (struct vnode *) fp->f_data; 864 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 865 if (vp->v_type != VDIR) 866 error = ENOTDIR; 867 else 868 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 869 VOP_UNLOCK(vp, 0); 870 if (error) 871 goto out; 872 VREF(vp); 873 874 /* 875 * Prevent escaping from chroot by putting the root under 876 * the working directory. Silently chdir to / if we aren't 877 * already there. 878 */ 879 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 880 /* 881 * XXX would be more failsafe to change directory to a 882 * deadfs node here instead 883 */ 884 vrele(cwdi->cwdi_cdir); 885 VREF(vp); 886 cwdi->cwdi_cdir = vp; 887 } 888 889 if (cwdi->cwdi_rdir != NULL) 890 vrele(cwdi->cwdi_rdir); 891 cwdi->cwdi_rdir = vp; 892 out: 893 FILE_UNUSE(fp, p); 894 return (error); 895 } 896 897 898 899 /* 900 * Change current working directory (``.''). 901 */ 902 /* ARGSUSED */ 903 int 904 sys_chdir(l, v, retval) 905 struct lwp *l; 906 void *v; 907 register_t *retval; 908 { 909 struct sys_chdir_args /* { 910 syscallarg(const char *) path; 911 } */ *uap = v; 912 struct proc *p = l->l_proc; 913 struct cwdinfo *cwdi = p->p_cwdi; 914 int error; 915 struct nameidata nd; 916 917 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 918 SCARG(uap, path), p); 919 if ((error = change_dir(&nd, p)) != 0) 920 return (error); 921 vrele(cwdi->cwdi_cdir); 922 cwdi->cwdi_cdir = nd.ni_vp; 923 return (0); 924 } 925 926 /* 927 * Change notion of root (``/'') directory. 928 */ 929 /* ARGSUSED */ 930 int 931 sys_chroot(l, v, retval) 932 struct lwp *l; 933 void *v; 934 register_t *retval; 935 { 936 struct sys_chroot_args /* { 937 syscallarg(const char *) path; 938 } */ *uap = v; 939 struct proc *p = l->l_proc; 940 struct cwdinfo *cwdi = p->p_cwdi; 941 struct vnode *vp; 942 int error; 943 struct nameidata nd; 944 945 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 946 return (error); 947 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 948 SCARG(uap, path), p); 949 if ((error = change_dir(&nd, p)) != 0) 950 return (error); 951 if (cwdi->cwdi_rdir != NULL) 952 vrele(cwdi->cwdi_rdir); 953 vp = nd.ni_vp; 954 cwdi->cwdi_rdir = vp; 955 956 /* 957 * Prevent escaping from chroot by putting the root under 958 * the working directory. Silently chdir to / if we aren't 959 * already there. 960 */ 961 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 962 /* 963 * XXX would be more failsafe to change directory to a 964 * deadfs node here instead 965 */ 966 vrele(cwdi->cwdi_cdir); 967 VREF(vp); 968 cwdi->cwdi_cdir = vp; 969 } 970 971 return (0); 972 } 973 974 /* 975 * Common routine for chroot and chdir. 976 */ 977 static int 978 change_dir(ndp, p) 979 struct nameidata *ndp; 980 struct proc *p; 981 { 982 struct vnode *vp; 983 int error; 984 985 if ((error = namei(ndp)) != 0) 986 return (error); 987 vp = ndp->ni_vp; 988 if (vp->v_type != VDIR) 989 error = ENOTDIR; 990 else 991 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 992 993 if (error) 994 vput(vp); 995 else 996 VOP_UNLOCK(vp, 0); 997 return (error); 998 } 999 1000 /* 1001 * Check permissions, allocate an open file structure, 1002 * and call the device open routine if any. 1003 */ 1004 int 1005 sys_open(l, v, retval) 1006 struct lwp *l; 1007 void *v; 1008 register_t *retval; 1009 { 1010 struct sys_open_args /* { 1011 syscallarg(const char *) path; 1012 syscallarg(int) flags; 1013 syscallarg(int) mode; 1014 } */ *uap = v; 1015 struct proc *p = l->l_proc; 1016 struct cwdinfo *cwdi = p->p_cwdi; 1017 struct filedesc *fdp = p->p_fd; 1018 struct file *fp; 1019 struct vnode *vp; 1020 int flags, cmode; 1021 int type, indx, error; 1022 struct flock lf; 1023 struct nameidata nd; 1024 1025 flags = FFLAGS(SCARG(uap, flags)); 1026 if ((flags & (FREAD | FWRITE)) == 0) 1027 return (EINVAL); 1028 /* falloc() will use the file descriptor for us */ 1029 if ((error = falloc(p, &fp, &indx)) != 0) 1030 return (error); 1031 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1032 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1033 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1034 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1035 FILE_UNUSE(fp, p); 1036 ffree(fp); 1037 if ((error == ENODEV || error == ENXIO) && 1038 p->p_dupfd >= 0 && /* XXX from fdopen */ 1039 (error = 1040 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1041 *retval = indx; 1042 return (0); 1043 } 1044 if (error == ERESTART) 1045 error = EINTR; 1046 fdremove(fdp, indx); 1047 return (error); 1048 } 1049 p->p_dupfd = 0; 1050 vp = nd.ni_vp; 1051 fp->f_flag = flags & FMASK; 1052 fp->f_type = DTYPE_VNODE; 1053 fp->f_ops = &vnops; 1054 fp->f_data = (caddr_t)vp; 1055 if (flags & (O_EXLOCK | O_SHLOCK)) { 1056 lf.l_whence = SEEK_SET; 1057 lf.l_start = 0; 1058 lf.l_len = 0; 1059 if (flags & O_EXLOCK) 1060 lf.l_type = F_WRLCK; 1061 else 1062 lf.l_type = F_RDLCK; 1063 type = F_FLOCK; 1064 if ((flags & FNONBLOCK) == 0) 1065 type |= F_WAIT; 1066 VOP_UNLOCK(vp, 0); 1067 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1068 if (error) { 1069 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1070 FILE_UNUSE(fp, p); 1071 ffree(fp); 1072 fdremove(fdp, indx); 1073 return (error); 1074 } 1075 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1076 fp->f_flag |= FHASLOCK; 1077 } 1078 VOP_UNLOCK(vp, 0); 1079 *retval = indx; 1080 FILE_SET_MATURE(fp); 1081 FILE_UNUSE(fp, p); 1082 return (0); 1083 } 1084 1085 /* 1086 * Get file handle system call 1087 */ 1088 int 1089 sys_getfh(l, v, retval) 1090 struct lwp *l; 1091 void *v; 1092 register_t *retval; 1093 { 1094 struct sys_getfh_args /* { 1095 syscallarg(char *) fname; 1096 syscallarg(fhandle_t *) fhp; 1097 } */ *uap = v; 1098 struct proc *p = l->l_proc; 1099 struct vnode *vp; 1100 fhandle_t fh; 1101 int error; 1102 struct nameidata nd; 1103 1104 /* 1105 * Must be super user 1106 */ 1107 error = suser(p->p_ucred, &p->p_acflag); 1108 if (error) 1109 return (error); 1110 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1111 SCARG(uap, fname), p); 1112 error = namei(&nd); 1113 if (error) 1114 return (error); 1115 vp = nd.ni_vp; 1116 memset((caddr_t)&fh, 0, sizeof(fh)); 1117 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1118 error = VFS_VPTOFH(vp, &fh.fh_fid); 1119 vput(vp); 1120 if (error) 1121 return (error); 1122 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1123 return (error); 1124 } 1125 1126 /* 1127 * Open a file given a file handle. 1128 * 1129 * Check permissions, allocate an open file structure, 1130 * and call the device open routine if any. 1131 */ 1132 int 1133 sys_fhopen(l, v, retval) 1134 struct lwp *l; 1135 void *v; 1136 register_t *retval; 1137 { 1138 struct sys_fhopen_args /* { 1139 syscallarg(const fhandle_t *) fhp; 1140 syscallarg(int) flags; 1141 } */ *uap = v; 1142 struct proc *p = l->l_proc; 1143 struct filedesc *fdp = p->p_fd; 1144 struct file *fp; 1145 struct vnode *vp = NULL; 1146 struct mount *mp; 1147 struct ucred *cred = p->p_ucred; 1148 int flags; 1149 struct file *nfp; 1150 int type, indx, error=0; 1151 struct flock lf; 1152 struct vattr va; 1153 fhandle_t fh; 1154 1155 /* 1156 * Must be super user 1157 */ 1158 if ((error = suser(p->p_ucred, &p->p_acflag))) 1159 return (error); 1160 1161 flags = FFLAGS(SCARG(uap, flags)); 1162 if ((flags & (FREAD | FWRITE)) == 0) 1163 return (EINVAL); 1164 if ((flags & O_CREAT)) 1165 return (EINVAL); 1166 /* falloc() will use the file descriptor for us */ 1167 if ((error = falloc(p, &nfp, &indx)) != 0) 1168 return (error); 1169 fp = nfp; 1170 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1171 goto bad; 1172 1173 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1174 error = ESTALE; 1175 goto bad; 1176 } 1177 1178 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1179 vp = NULL; /* most likely unnecessary sanity for bad: */ 1180 goto bad; 1181 } 1182 1183 /* Now do an effective vn_open */ 1184 1185 if (vp->v_type == VSOCK) { 1186 error = EOPNOTSUPP; 1187 goto bad; 1188 } 1189 if (flags & FREAD) { 1190 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1191 goto bad; 1192 } 1193 if (flags & (FWRITE | O_TRUNC)) { 1194 if (vp->v_type == VDIR) { 1195 error = EISDIR; 1196 goto bad; 1197 } 1198 if ((error = vn_writechk(vp)) != 0 || 1199 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1200 goto bad; 1201 } 1202 if (flags & O_TRUNC) { 1203 VOP_UNLOCK(vp, 0); /* XXX */ 1204 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1205 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1206 VATTR_NULL(&va); 1207 va.va_size = 0; 1208 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1209 goto bad; 1210 } 1211 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1212 goto bad; 1213 if (vp->v_type == VREG && 1214 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1215 error = EIO; 1216 goto bad; 1217 } 1218 if (flags & FWRITE) 1219 vp->v_writecount++; 1220 1221 /* done with modified vn_open, now finish what sys_open does. */ 1222 1223 fp->f_flag = flags & FMASK; 1224 fp->f_type = DTYPE_VNODE; 1225 fp->f_ops = &vnops; 1226 fp->f_data = (caddr_t)vp; 1227 if (flags & (O_EXLOCK | O_SHLOCK)) { 1228 lf.l_whence = SEEK_SET; 1229 lf.l_start = 0; 1230 lf.l_len = 0; 1231 if (flags & O_EXLOCK) 1232 lf.l_type = F_WRLCK; 1233 else 1234 lf.l_type = F_RDLCK; 1235 type = F_FLOCK; 1236 if ((flags & FNONBLOCK) == 0) 1237 type |= F_WAIT; 1238 VOP_UNLOCK(vp, 0); 1239 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1240 if (error) { 1241 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1242 FILE_UNUSE(fp, p); 1243 ffree(fp); 1244 fdremove(fdp, indx); 1245 return (error); 1246 } 1247 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1248 fp->f_flag |= FHASLOCK; 1249 } 1250 VOP_UNLOCK(vp, 0); 1251 *retval = indx; 1252 FILE_SET_MATURE(fp); 1253 FILE_UNUSE(fp, p); 1254 return (0); 1255 1256 bad: 1257 FILE_UNUSE(fp, p); 1258 ffree(fp); 1259 fdremove(fdp, indx); 1260 if (vp != NULL) 1261 vput(vp); 1262 return (error); 1263 } 1264 1265 /* ARGSUSED */ 1266 int 1267 sys_fhstat(l, v, retval) 1268 struct lwp *l; 1269 void *v; 1270 register_t *retval; 1271 { 1272 struct sys_fhstat_args /* { 1273 syscallarg(const fhandle_t *) fhp; 1274 syscallarg(struct stat *) sb; 1275 } */ *uap = v; 1276 struct proc *p = l->l_proc; 1277 struct stat sb; 1278 int error; 1279 fhandle_t fh; 1280 struct mount *mp; 1281 struct vnode *vp; 1282 1283 /* 1284 * Must be super user 1285 */ 1286 if ((error = suser(p->p_ucred, &p->p_acflag))) 1287 return (error); 1288 1289 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1290 return (error); 1291 1292 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1293 return (ESTALE); 1294 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1295 return (error); 1296 error = vn_stat(vp, &sb, p); 1297 vput(vp); 1298 if (error) 1299 return (error); 1300 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1301 return (error); 1302 } 1303 1304 /* ARGSUSED */ 1305 int 1306 sys_fhstatfs(l, v, retval) 1307 struct lwp *l; 1308 void *v; 1309 register_t *retval; 1310 { 1311 struct sys_fhstatfs_args /* 1312 syscallarg(const fhandle_t *) fhp; 1313 syscallarg(struct statfs *) buf; 1314 } */ *uap = v; 1315 struct proc *p = l->l_proc; 1316 struct statfs sp; 1317 fhandle_t fh; 1318 struct mount *mp; 1319 struct vnode *vp; 1320 int error; 1321 1322 /* 1323 * Must be super user 1324 */ 1325 if ((error = suser(p->p_ucred, &p->p_acflag))) 1326 return (error); 1327 1328 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1329 return (error); 1330 1331 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1332 return (ESTALE); 1333 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1334 return (error); 1335 mp = vp->v_mount; 1336 vput(vp); 1337 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1338 return (error); 1339 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1340 sp.f_oflags = sp.f_flags & 0xffff; 1341 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1342 } 1343 1344 /* 1345 * Create a special file. 1346 */ 1347 /* ARGSUSED */ 1348 int 1349 sys_mknod(l, v, retval) 1350 struct lwp *l; 1351 void *v; 1352 register_t *retval; 1353 { 1354 struct sys_mknod_args /* { 1355 syscallarg(const char *) path; 1356 syscallarg(int) mode; 1357 syscallarg(int) dev; 1358 } */ *uap = v; 1359 struct proc *p = l->l_proc; 1360 struct vnode *vp; 1361 struct vattr vattr; 1362 int error; 1363 int whiteout = 0; 1364 struct nameidata nd; 1365 1366 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1367 return (error); 1368 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1369 if ((error = namei(&nd)) != 0) 1370 return (error); 1371 vp = nd.ni_vp; 1372 if (vp != NULL) 1373 error = EEXIST; 1374 else { 1375 VATTR_NULL(&vattr); 1376 vattr.va_mode = 1377 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1378 vattr.va_rdev = SCARG(uap, dev); 1379 whiteout = 0; 1380 1381 switch (SCARG(uap, mode) & S_IFMT) { 1382 case S_IFMT: /* used by badsect to flag bad sectors */ 1383 vattr.va_type = VBAD; 1384 break; 1385 case S_IFCHR: 1386 vattr.va_type = VCHR; 1387 break; 1388 case S_IFBLK: 1389 vattr.va_type = VBLK; 1390 break; 1391 case S_IFWHT: 1392 whiteout = 1; 1393 break; 1394 default: 1395 error = EINVAL; 1396 break; 1397 } 1398 } 1399 if (!error) { 1400 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1401 if (whiteout) { 1402 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1403 if (error) 1404 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1405 vput(nd.ni_dvp); 1406 } else { 1407 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1408 &nd.ni_cnd, &vattr); 1409 if (error == 0) 1410 vput(nd.ni_vp); 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 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1460 if (error == 0) 1461 vput(nd.ni_vp); 1462 return (error); 1463 } 1464 1465 /* 1466 * Make a hard file link. 1467 */ 1468 /* ARGSUSED */ 1469 int 1470 sys_link(l, v, retval) 1471 struct lwp *l; 1472 void *v; 1473 register_t *retval; 1474 { 1475 struct sys_link_args /* { 1476 syscallarg(const char *) path; 1477 syscallarg(const char *) link; 1478 } */ *uap = v; 1479 struct proc *p = l->l_proc; 1480 struct vnode *vp; 1481 struct nameidata nd; 1482 int error; 1483 1484 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1485 if ((error = namei(&nd)) != 0) 1486 return (error); 1487 vp = nd.ni_vp; 1488 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1489 if ((error = namei(&nd)) != 0) 1490 goto out; 1491 if (nd.ni_vp) { 1492 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1493 if (nd.ni_dvp == nd.ni_vp) 1494 vrele(nd.ni_dvp); 1495 else 1496 vput(nd.ni_dvp); 1497 vrele(nd.ni_vp); 1498 error = EEXIST; 1499 goto out; 1500 } 1501 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1502 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1503 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1504 out: 1505 vrele(vp); 1506 return (error); 1507 } 1508 1509 /* 1510 * Make a symbolic link. 1511 */ 1512 /* ARGSUSED */ 1513 int 1514 sys_symlink(l, v, retval) 1515 struct lwp *l; 1516 void *v; 1517 register_t *retval; 1518 { 1519 struct sys_symlink_args /* { 1520 syscallarg(const char *) path; 1521 syscallarg(const char *) link; 1522 } */ *uap = v; 1523 struct proc *p = l->l_proc; 1524 struct vattr vattr; 1525 char *path; 1526 int error; 1527 struct nameidata nd; 1528 1529 path = PNBUF_GET(); 1530 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1531 if (error) 1532 goto out; 1533 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1534 if ((error = namei(&nd)) != 0) 1535 goto out; 1536 if (nd.ni_vp) { 1537 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1538 if (nd.ni_dvp == nd.ni_vp) 1539 vrele(nd.ni_dvp); 1540 else 1541 vput(nd.ni_dvp); 1542 vrele(nd.ni_vp); 1543 error = EEXIST; 1544 goto out; 1545 } 1546 VATTR_NULL(&vattr); 1547 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1548 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1549 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1550 if (error == 0) 1551 vput(nd.ni_vp); 1552 out: 1553 PNBUF_PUT(path); 1554 return (error); 1555 } 1556 1557 /* 1558 * Delete a whiteout from the filesystem. 1559 */ 1560 /* ARGSUSED */ 1561 int 1562 sys_undelete(l, v, retval) 1563 struct lwp *l; 1564 void *v; 1565 register_t *retval; 1566 { 1567 struct sys_undelete_args /* { 1568 syscallarg(const char *) path; 1569 } */ *uap = v; 1570 struct proc *p = l->l_proc; 1571 int error; 1572 struct nameidata nd; 1573 1574 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1575 SCARG(uap, path), p); 1576 error = namei(&nd); 1577 if (error) 1578 return (error); 1579 1580 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1581 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1582 if (nd.ni_dvp == nd.ni_vp) 1583 vrele(nd.ni_dvp); 1584 else 1585 vput(nd.ni_dvp); 1586 if (nd.ni_vp) 1587 vrele(nd.ni_vp); 1588 return (EEXIST); 1589 } 1590 1591 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1592 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1593 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1594 vput(nd.ni_dvp); 1595 return (error); 1596 } 1597 1598 /* 1599 * Delete a name from the filesystem. 1600 */ 1601 /* ARGSUSED */ 1602 int 1603 sys_unlink(l, v, retval) 1604 struct lwp *l; 1605 void *v; 1606 register_t *retval; 1607 { 1608 struct sys_unlink_args /* { 1609 syscallarg(const char *) path; 1610 } */ *uap = v; 1611 struct proc *p = l->l_proc; 1612 struct vnode *vp; 1613 int error; 1614 struct nameidata nd; 1615 1616 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1617 SCARG(uap, path), p); 1618 if ((error = namei(&nd)) != 0) 1619 return (error); 1620 vp = nd.ni_vp; 1621 1622 /* 1623 * The root of a mounted filesystem cannot be deleted. 1624 */ 1625 if (vp->v_flag & VROOT) { 1626 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1627 if (nd.ni_dvp == vp) 1628 vrele(nd.ni_dvp); 1629 else 1630 vput(nd.ni_dvp); 1631 vput(vp); 1632 error = EBUSY; 1633 goto out; 1634 } 1635 1636 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1637 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1638 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1639 out: 1640 return (error); 1641 } 1642 1643 /* 1644 * Reposition read/write file offset. 1645 */ 1646 int 1647 sys_lseek(l, v, retval) 1648 struct lwp *l; 1649 void *v; 1650 register_t *retval; 1651 { 1652 struct sys_lseek_args /* { 1653 syscallarg(int) fd; 1654 syscallarg(int) pad; 1655 syscallarg(off_t) offset; 1656 syscallarg(int) whence; 1657 } */ *uap = v; 1658 struct proc *p = l->l_proc; 1659 struct ucred *cred = p->p_ucred; 1660 struct filedesc *fdp = p->p_fd; 1661 struct file *fp; 1662 struct vnode *vp; 1663 struct vattr vattr; 1664 off_t newoff; 1665 int error; 1666 1667 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1668 return (EBADF); 1669 1670 FILE_USE(fp); 1671 1672 vp = (struct vnode *)fp->f_data; 1673 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1674 error = ESPIPE; 1675 goto out; 1676 } 1677 1678 switch (SCARG(uap, whence)) { 1679 case SEEK_CUR: 1680 newoff = fp->f_offset + SCARG(uap, offset); 1681 break; 1682 case SEEK_END: 1683 error = VOP_GETATTR(vp, &vattr, cred, p); 1684 if (error) 1685 goto out; 1686 newoff = SCARG(uap, offset) + vattr.va_size; 1687 break; 1688 case SEEK_SET: 1689 newoff = SCARG(uap, offset); 1690 break; 1691 default: 1692 error = EINVAL; 1693 goto out; 1694 } 1695 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1696 goto out; 1697 1698 *(off_t *)retval = fp->f_offset = newoff; 1699 out: 1700 FILE_UNUSE(fp, p); 1701 return (error); 1702 } 1703 1704 /* 1705 * Positional read system call. 1706 */ 1707 int 1708 sys_pread(l, v, retval) 1709 struct lwp *l; 1710 void *v; 1711 register_t *retval; 1712 { 1713 struct sys_pread_args /* { 1714 syscallarg(int) fd; 1715 syscallarg(void *) buf; 1716 syscallarg(size_t) nbyte; 1717 syscallarg(off_t) offset; 1718 } */ *uap = v; 1719 struct proc *p = l->l_proc; 1720 struct filedesc *fdp = p->p_fd; 1721 struct file *fp; 1722 struct vnode *vp; 1723 off_t offset; 1724 int error, fd = SCARG(uap, fd); 1725 1726 if ((fp = fd_getfile(fdp, fd)) == NULL) 1727 return (EBADF); 1728 1729 if ((fp->f_flag & FREAD) == 0) 1730 return (EBADF); 1731 1732 FILE_USE(fp); 1733 1734 vp = (struct vnode *)fp->f_data; 1735 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1736 error = ESPIPE; 1737 goto out; 1738 } 1739 1740 offset = SCARG(uap, offset); 1741 1742 /* 1743 * XXX This works because no file systems actually 1744 * XXX take any action on the seek operation. 1745 */ 1746 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1747 goto out; 1748 1749 /* dofileread() will unuse the descriptor for us */ 1750 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1751 &offset, 0, retval)); 1752 1753 out: 1754 FILE_UNUSE(fp, p); 1755 return (error); 1756 } 1757 1758 /* 1759 * Positional scatter read system call. 1760 */ 1761 int 1762 sys_preadv(l, v, retval) 1763 struct lwp *l; 1764 void *v; 1765 register_t *retval; 1766 { 1767 struct sys_preadv_args /* { 1768 syscallarg(int) fd; 1769 syscallarg(const struct iovec *) iovp; 1770 syscallarg(int) iovcnt; 1771 syscallarg(off_t) offset; 1772 } */ *uap = v; 1773 struct proc *p = l->l_proc; 1774 struct filedesc *fdp = p->p_fd; 1775 struct file *fp; 1776 struct vnode *vp; 1777 off_t offset; 1778 int error, fd = SCARG(uap, fd); 1779 1780 if ((fp = fd_getfile(fdp, fd)) == NULL) 1781 return (EBADF); 1782 1783 if ((fp->f_flag & FREAD) == 0) 1784 return (EBADF); 1785 1786 FILE_USE(fp); 1787 1788 vp = (struct vnode *)fp->f_data; 1789 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1790 error = ESPIPE; 1791 goto out; 1792 } 1793 1794 offset = SCARG(uap, offset); 1795 1796 /* 1797 * XXX This works because no file systems actually 1798 * XXX take any action on the seek operation. 1799 */ 1800 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1801 goto out; 1802 1803 /* dofilereadv() will unuse the descriptor for us */ 1804 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1805 &offset, 0, retval)); 1806 1807 out: 1808 FILE_UNUSE(fp, p); 1809 return (error); 1810 } 1811 1812 /* 1813 * Positional write system call. 1814 */ 1815 int 1816 sys_pwrite(l, v, retval) 1817 struct lwp *l; 1818 void *v; 1819 register_t *retval; 1820 { 1821 struct sys_pwrite_args /* { 1822 syscallarg(int) fd; 1823 syscallarg(const void *) buf; 1824 syscallarg(size_t) nbyte; 1825 syscallarg(off_t) offset; 1826 } */ *uap = v; 1827 struct proc *p = l->l_proc; 1828 struct filedesc *fdp = p->p_fd; 1829 struct file *fp; 1830 struct vnode *vp; 1831 off_t offset; 1832 int error, fd = SCARG(uap, fd); 1833 1834 if ((fp = fd_getfile(fdp, fd)) == NULL) 1835 return (EBADF); 1836 1837 if ((fp->f_flag & FWRITE) == 0) 1838 return (EBADF); 1839 1840 FILE_USE(fp); 1841 1842 vp = (struct vnode *)fp->f_data; 1843 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1844 error = ESPIPE; 1845 goto out; 1846 } 1847 1848 offset = SCARG(uap, offset); 1849 1850 /* 1851 * XXX This works because no file systems actually 1852 * XXX take any action on the seek operation. 1853 */ 1854 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1855 goto out; 1856 1857 /* dofilewrite() will unuse the descriptor for us */ 1858 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1859 &offset, 0, retval)); 1860 1861 out: 1862 FILE_UNUSE(fp, p); 1863 return (error); 1864 } 1865 1866 /* 1867 * Positional gather write system call. 1868 */ 1869 int 1870 sys_pwritev(l, v, retval) 1871 struct lwp *l; 1872 void *v; 1873 register_t *retval; 1874 { 1875 struct sys_pwritev_args /* { 1876 syscallarg(int) fd; 1877 syscallarg(const struct iovec *) iovp; 1878 syscallarg(int) iovcnt; 1879 syscallarg(off_t) offset; 1880 } */ *uap = v; 1881 struct proc *p = l->l_proc; 1882 struct filedesc *fdp = p->p_fd; 1883 struct file *fp; 1884 struct vnode *vp; 1885 off_t offset; 1886 int error, fd = SCARG(uap, fd); 1887 1888 if ((fp = fd_getfile(fdp, fd)) == NULL) 1889 return (EBADF); 1890 1891 if ((fp->f_flag & FWRITE) == 0) 1892 return (EBADF); 1893 1894 FILE_USE(fp); 1895 1896 vp = (struct vnode *)fp->f_data; 1897 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1898 error = ESPIPE; 1899 goto out; 1900 } 1901 1902 offset = SCARG(uap, offset); 1903 1904 /* 1905 * XXX This works because no file systems actually 1906 * XXX take any action on the seek operation. 1907 */ 1908 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1909 goto out; 1910 1911 /* dofilewritev() will unuse the descriptor for us */ 1912 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1913 &offset, 0, retval)); 1914 1915 out: 1916 FILE_UNUSE(fp, p); 1917 return (error); 1918 } 1919 1920 /* 1921 * Check access permissions. 1922 */ 1923 int 1924 sys_access(l, v, retval) 1925 struct lwp *l; 1926 void *v; 1927 register_t *retval; 1928 { 1929 struct sys_access_args /* { 1930 syscallarg(const char *) path; 1931 syscallarg(int) flags; 1932 } */ *uap = v; 1933 struct proc *p = l->l_proc; 1934 struct ucred *cred = crget(); 1935 struct vnode *vp; 1936 int error, flags; 1937 struct nameidata nd; 1938 1939 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 1940 cred->cr_ref = 1; 1941 cred->cr_uid = p->p_cred->p_ruid; 1942 cred->cr_gid = p->p_cred->p_rgid; 1943 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1944 SCARG(uap, path), p); 1945 /* Override default credentials */ 1946 nd.ni_cnd.cn_cred = cred; 1947 if ((error = namei(&nd)) != 0) 1948 goto out; 1949 vp = nd.ni_vp; 1950 1951 /* Flags == 0 means only check for existence. */ 1952 if (SCARG(uap, flags)) { 1953 flags = 0; 1954 if (SCARG(uap, flags) & R_OK) 1955 flags |= VREAD; 1956 if (SCARG(uap, flags) & W_OK) 1957 flags |= VWRITE; 1958 if (SCARG(uap, flags) & X_OK) 1959 flags |= VEXEC; 1960 1961 error = VOP_ACCESS(vp, flags, cred, p); 1962 if (!error && (flags & VWRITE)) 1963 error = vn_writechk(vp); 1964 } 1965 vput(vp); 1966 out: 1967 crfree(cred); 1968 return (error); 1969 } 1970 1971 /* 1972 * Get file status; this version follows links. 1973 */ 1974 /* ARGSUSED */ 1975 int 1976 sys___stat13(l, v, retval) 1977 struct lwp *l; 1978 void *v; 1979 register_t *retval; 1980 { 1981 struct sys___stat13_args /* { 1982 syscallarg(const char *) path; 1983 syscallarg(struct stat *) ub; 1984 } */ *uap = v; 1985 struct proc *p = l->l_proc; 1986 struct stat sb; 1987 int error; 1988 struct nameidata nd; 1989 1990 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1991 SCARG(uap, path), p); 1992 if ((error = namei(&nd)) != 0) 1993 return (error); 1994 error = vn_stat(nd.ni_vp, &sb, p); 1995 vput(nd.ni_vp); 1996 if (error) 1997 return (error); 1998 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1999 return (error); 2000 } 2001 2002 /* 2003 * Get file status; this version does not follow links. 2004 */ 2005 /* ARGSUSED */ 2006 int 2007 sys___lstat13(l, v, retval) 2008 struct lwp *l; 2009 void *v; 2010 register_t *retval; 2011 { 2012 struct sys___lstat13_args /* { 2013 syscallarg(const char *) path; 2014 syscallarg(struct stat *) ub; 2015 } */ *uap = v; 2016 struct proc *p = l->l_proc; 2017 struct stat sb; 2018 int error; 2019 struct nameidata nd; 2020 2021 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2022 SCARG(uap, path), p); 2023 if ((error = namei(&nd)) != 0) 2024 return (error); 2025 error = vn_stat(nd.ni_vp, &sb, p); 2026 vput(nd.ni_vp); 2027 if (error) 2028 return (error); 2029 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2030 return (error); 2031 } 2032 2033 /* 2034 * Get configurable pathname variables. 2035 */ 2036 /* ARGSUSED */ 2037 int 2038 sys_pathconf(l, v, retval) 2039 struct lwp *l; 2040 void *v; 2041 register_t *retval; 2042 { 2043 struct sys_pathconf_args /* { 2044 syscallarg(const char *) path; 2045 syscallarg(int) name; 2046 } */ *uap = v; 2047 struct proc *p = l->l_proc; 2048 int error; 2049 struct nameidata nd; 2050 2051 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2052 SCARG(uap, path), p); 2053 if ((error = namei(&nd)) != 0) 2054 return (error); 2055 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2056 vput(nd.ni_vp); 2057 return (error); 2058 } 2059 2060 /* 2061 * Return target name of a symbolic link. 2062 */ 2063 /* ARGSUSED */ 2064 int 2065 sys_readlink(l, v, retval) 2066 struct lwp *l; 2067 void *v; 2068 register_t *retval; 2069 { 2070 struct sys_readlink_args /* { 2071 syscallarg(const char *) path; 2072 syscallarg(char *) buf; 2073 syscallarg(size_t) count; 2074 } */ *uap = v; 2075 struct proc *p = l->l_proc; 2076 struct vnode *vp; 2077 struct iovec aiov; 2078 struct uio auio; 2079 int error; 2080 struct nameidata nd; 2081 2082 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2083 SCARG(uap, path), p); 2084 if ((error = namei(&nd)) != 0) 2085 return (error); 2086 vp = nd.ni_vp; 2087 if (vp->v_type != VLNK) 2088 error = EINVAL; 2089 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2090 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2091 aiov.iov_base = SCARG(uap, buf); 2092 aiov.iov_len = SCARG(uap, count); 2093 auio.uio_iov = &aiov; 2094 auio.uio_iovcnt = 1; 2095 auio.uio_offset = 0; 2096 auio.uio_rw = UIO_READ; 2097 auio.uio_segflg = UIO_USERSPACE; 2098 auio.uio_procp = p; 2099 auio.uio_resid = SCARG(uap, count); 2100 error = VOP_READLINK(vp, &auio, p->p_ucred); 2101 } 2102 vput(vp); 2103 *retval = SCARG(uap, count) - auio.uio_resid; 2104 return (error); 2105 } 2106 2107 /* 2108 * Change flags of a file given a path name. 2109 */ 2110 /* ARGSUSED */ 2111 int 2112 sys_chflags(l, v, retval) 2113 struct lwp *l; 2114 void *v; 2115 register_t *retval; 2116 { 2117 struct sys_chflags_args /* { 2118 syscallarg(const char *) path; 2119 syscallarg(u_long) flags; 2120 } */ *uap = v; 2121 struct proc *p = l->l_proc; 2122 struct vnode *vp; 2123 int error; 2124 struct nameidata nd; 2125 2126 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2127 if ((error = namei(&nd)) != 0) 2128 return (error); 2129 vp = nd.ni_vp; 2130 error = change_flags(vp, SCARG(uap, flags), p); 2131 vput(vp); 2132 return (error); 2133 } 2134 2135 /* 2136 * Change flags of a file given a file descriptor. 2137 */ 2138 /* ARGSUSED */ 2139 int 2140 sys_fchflags(l, v, retval) 2141 struct lwp *l; 2142 void *v; 2143 register_t *retval; 2144 { 2145 struct sys_fchflags_args /* { 2146 syscallarg(int) fd; 2147 syscallarg(u_long) flags; 2148 } */ *uap = v; 2149 struct proc *p = l->l_proc; 2150 struct vnode *vp; 2151 struct file *fp; 2152 int error; 2153 2154 /* getvnode() will use the descriptor for us */ 2155 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2156 return (error); 2157 vp = (struct vnode *)fp->f_data; 2158 error = change_flags(vp, SCARG(uap, flags), p); 2159 VOP_UNLOCK(vp, 0); 2160 FILE_UNUSE(fp, p); 2161 return (error); 2162 } 2163 2164 /* 2165 * Change flags of a file given a path name; this version does 2166 * not follow links. 2167 */ 2168 int 2169 sys_lchflags(l, v, retval) 2170 struct lwp *l; 2171 void *v; 2172 register_t *retval; 2173 { 2174 struct sys_lchflags_args /* { 2175 syscallarg(const char *) path; 2176 syscallarg(u_long) flags; 2177 } */ *uap = v; 2178 struct proc *p = l->l_proc; 2179 struct vnode *vp; 2180 int error; 2181 struct nameidata nd; 2182 2183 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2184 if ((error = namei(&nd)) != 0) 2185 return (error); 2186 vp = nd.ni_vp; 2187 error = change_flags(vp, SCARG(uap, flags), p); 2188 vput(vp); 2189 return (error); 2190 } 2191 2192 /* 2193 * Common routine to change flags of a file. 2194 */ 2195 int 2196 change_flags(vp, flags, p) 2197 struct vnode *vp; 2198 u_long flags; 2199 struct proc *p; 2200 { 2201 struct vattr vattr; 2202 int error; 2203 2204 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2205 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2206 /* 2207 * Non-superusers cannot change the flags on devices, even if they 2208 * own them. 2209 */ 2210 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2211 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2212 goto out; 2213 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2214 error = EINVAL; 2215 goto out; 2216 } 2217 } 2218 VATTR_NULL(&vattr); 2219 vattr.va_flags = flags; 2220 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2221 out: 2222 return (error); 2223 } 2224 2225 /* 2226 * Change mode of a file given path name; this version follows links. 2227 */ 2228 /* ARGSUSED */ 2229 int 2230 sys_chmod(l, v, retval) 2231 struct lwp *l; 2232 void *v; 2233 register_t *retval; 2234 { 2235 struct sys_chmod_args /* { 2236 syscallarg(const char *) path; 2237 syscallarg(int) mode; 2238 } */ *uap = v; 2239 struct proc *p = l->l_proc; 2240 int error; 2241 struct nameidata nd; 2242 2243 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2244 if ((error = namei(&nd)) != 0) 2245 return (error); 2246 2247 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2248 2249 vrele(nd.ni_vp); 2250 return (error); 2251 } 2252 2253 /* 2254 * Change mode of a file given a file descriptor. 2255 */ 2256 /* ARGSUSED */ 2257 int 2258 sys_fchmod(l, v, retval) 2259 struct lwp *l; 2260 void *v; 2261 register_t *retval; 2262 { 2263 struct sys_fchmod_args /* { 2264 syscallarg(int) fd; 2265 syscallarg(int) mode; 2266 } */ *uap = v; 2267 struct proc *p = l->l_proc; 2268 struct file *fp; 2269 int error; 2270 2271 /* getvnode() will use the descriptor for us */ 2272 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2273 return (error); 2274 2275 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2276 FILE_UNUSE(fp, p); 2277 return (error); 2278 } 2279 2280 /* 2281 * Change mode of a file given path name; this version does not follow links. 2282 */ 2283 /* ARGSUSED */ 2284 int 2285 sys_lchmod(l, v, retval) 2286 struct lwp *l; 2287 void *v; 2288 register_t *retval; 2289 { 2290 struct sys_lchmod_args /* { 2291 syscallarg(const char *) path; 2292 syscallarg(int) mode; 2293 } */ *uap = v; 2294 struct proc *p = l->l_proc; 2295 int error; 2296 struct nameidata nd; 2297 2298 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2299 if ((error = namei(&nd)) != 0) 2300 return (error); 2301 2302 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2303 2304 vrele(nd.ni_vp); 2305 return (error); 2306 } 2307 2308 /* 2309 * Common routine to set mode given a vnode. 2310 */ 2311 static int 2312 change_mode(vp, mode, p) 2313 struct vnode *vp; 2314 int mode; 2315 struct proc *p; 2316 { 2317 struct vattr vattr; 2318 int error; 2319 2320 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2321 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2322 VATTR_NULL(&vattr); 2323 vattr.va_mode = mode & ALLPERMS; 2324 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2325 VOP_UNLOCK(vp, 0); 2326 return (error); 2327 } 2328 2329 /* 2330 * Set ownership given a path name; this version follows links. 2331 */ 2332 /* ARGSUSED */ 2333 int 2334 sys_chown(l, v, retval) 2335 struct lwp *l; 2336 void *v; 2337 register_t *retval; 2338 { 2339 struct sys_chown_args /* { 2340 syscallarg(const char *) path; 2341 syscallarg(uid_t) uid; 2342 syscallarg(gid_t) gid; 2343 } */ *uap = v; 2344 struct proc *p = l->l_proc; 2345 int error; 2346 struct nameidata nd; 2347 2348 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2349 if ((error = namei(&nd)) != 0) 2350 return (error); 2351 2352 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2353 2354 vrele(nd.ni_vp); 2355 return (error); 2356 } 2357 2358 /* 2359 * Set ownership given a path name; this version follows links. 2360 * Provides POSIX semantics. 2361 */ 2362 /* ARGSUSED */ 2363 int 2364 sys___posix_chown(l, v, retval) 2365 struct lwp *l; 2366 void *v; 2367 register_t *retval; 2368 { 2369 struct sys_chown_args /* { 2370 syscallarg(const char *) path; 2371 syscallarg(uid_t) uid; 2372 syscallarg(gid_t) gid; 2373 } */ *uap = v; 2374 struct proc *p = l->l_proc; 2375 int error; 2376 struct nameidata nd; 2377 2378 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2379 if ((error = namei(&nd)) != 0) 2380 return (error); 2381 2382 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2383 2384 vrele(nd.ni_vp); 2385 return (error); 2386 } 2387 2388 /* 2389 * Set ownership given a file descriptor. 2390 */ 2391 /* ARGSUSED */ 2392 int 2393 sys_fchown(l, v, retval) 2394 struct lwp *l; 2395 void *v; 2396 register_t *retval; 2397 { 2398 struct sys_fchown_args /* { 2399 syscallarg(int) fd; 2400 syscallarg(uid_t) uid; 2401 syscallarg(gid_t) gid; 2402 } */ *uap = v; 2403 struct proc *p = l->l_proc; 2404 int error; 2405 struct file *fp; 2406 2407 /* getvnode() will use the descriptor for us */ 2408 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2409 return (error); 2410 2411 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2412 SCARG(uap, gid), p, 0); 2413 FILE_UNUSE(fp, p); 2414 return (error); 2415 } 2416 2417 /* 2418 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2419 */ 2420 /* ARGSUSED */ 2421 int 2422 sys___posix_fchown(l, v, retval) 2423 struct lwp *l; 2424 void *v; 2425 register_t *retval; 2426 { 2427 struct sys_fchown_args /* { 2428 syscallarg(int) fd; 2429 syscallarg(uid_t) uid; 2430 syscallarg(gid_t) gid; 2431 } */ *uap = v; 2432 struct proc *p = l->l_proc; 2433 int error; 2434 struct file *fp; 2435 2436 /* getvnode() will use the descriptor for us */ 2437 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2438 return (error); 2439 2440 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2441 SCARG(uap, gid), p, 1); 2442 FILE_UNUSE(fp, p); 2443 return (error); 2444 } 2445 2446 /* 2447 * Set ownership given a path name; this version does not follow links. 2448 */ 2449 /* ARGSUSED */ 2450 int 2451 sys_lchown(l, v, retval) 2452 struct lwp *l; 2453 void *v; 2454 register_t *retval; 2455 { 2456 struct sys_lchown_args /* { 2457 syscallarg(const char *) path; 2458 syscallarg(uid_t) uid; 2459 syscallarg(gid_t) gid; 2460 } */ *uap = v; 2461 struct proc *p = l->l_proc; 2462 int error; 2463 struct nameidata nd; 2464 2465 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2466 if ((error = namei(&nd)) != 0) 2467 return (error); 2468 2469 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2470 2471 vrele(nd.ni_vp); 2472 return (error); 2473 } 2474 2475 /* 2476 * Set ownership given a path name; this version does not follow links. 2477 * Provides POSIX/XPG semantics. 2478 */ 2479 /* ARGSUSED */ 2480 int 2481 sys___posix_lchown(l, v, retval) 2482 struct lwp *l; 2483 void *v; 2484 register_t *retval; 2485 { 2486 struct sys_lchown_args /* { 2487 syscallarg(const char *) path; 2488 syscallarg(uid_t) uid; 2489 syscallarg(gid_t) gid; 2490 } */ *uap = v; 2491 struct proc *p = l->l_proc; 2492 int error; 2493 struct nameidata nd; 2494 2495 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2496 if ((error = namei(&nd)) != 0) 2497 return (error); 2498 2499 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2500 2501 vrele(nd.ni_vp); 2502 return (error); 2503 } 2504 2505 /* 2506 * Common routine to set ownership given a vnode. 2507 */ 2508 static int 2509 change_owner(vp, uid, gid, p, posix_semantics) 2510 struct vnode *vp; 2511 uid_t uid; 2512 gid_t gid; 2513 struct proc *p; 2514 int posix_semantics; 2515 { 2516 struct vattr vattr; 2517 mode_t newmode; 2518 int error; 2519 2520 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2521 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2522 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2523 goto out; 2524 2525 #define CHANGED(x) ((int)(x) != -1) 2526 newmode = vattr.va_mode; 2527 if (posix_semantics) { 2528 /* 2529 * POSIX/XPG semantics: if the caller is not the super-user, 2530 * clear set-user-id and set-group-id bits. Both POSIX and 2531 * the XPG consider the behaviour for calls by the super-user 2532 * implementation-defined; we leave the set-user-id and set- 2533 * group-id settings intact in that case. 2534 */ 2535 if (suser(p->p_ucred, NULL) != 0) 2536 newmode &= ~(S_ISUID | S_ISGID); 2537 } else { 2538 /* 2539 * NetBSD semantics: when changing owner and/or group, 2540 * clear the respective bit(s). 2541 */ 2542 if (CHANGED(uid)) 2543 newmode &= ~S_ISUID; 2544 if (CHANGED(gid)) 2545 newmode &= ~S_ISGID; 2546 } 2547 /* Update va_mode iff altered. */ 2548 if (vattr.va_mode == newmode) 2549 newmode = VNOVAL; 2550 2551 VATTR_NULL(&vattr); 2552 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2553 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2554 vattr.va_mode = newmode; 2555 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2556 #undef CHANGED 2557 2558 out: 2559 VOP_UNLOCK(vp, 0); 2560 return (error); 2561 } 2562 2563 /* 2564 * Set the access and modification times given a path name; this 2565 * version follows links. 2566 */ 2567 /* ARGSUSED */ 2568 int 2569 sys_utimes(l, v, retval) 2570 struct lwp *l; 2571 void *v; 2572 register_t *retval; 2573 { 2574 struct sys_utimes_args /* { 2575 syscallarg(const char *) path; 2576 syscallarg(const struct timeval *) tptr; 2577 } */ *uap = v; 2578 struct proc *p = l->l_proc; 2579 int error; 2580 struct nameidata nd; 2581 2582 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2583 if ((error = namei(&nd)) != 0) 2584 return (error); 2585 2586 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2587 2588 vrele(nd.ni_vp); 2589 return (error); 2590 } 2591 2592 /* 2593 * Set the access and modification times given a file descriptor. 2594 */ 2595 /* ARGSUSED */ 2596 int 2597 sys_futimes(l, v, retval) 2598 struct lwp *l; 2599 void *v; 2600 register_t *retval; 2601 { 2602 struct sys_futimes_args /* { 2603 syscallarg(int) fd; 2604 syscallarg(const struct timeval *) tptr; 2605 } */ *uap = v; 2606 struct proc *p = l->l_proc; 2607 int error; 2608 struct file *fp; 2609 2610 /* getvnode() will use the descriptor for us */ 2611 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2612 return (error); 2613 2614 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2615 FILE_UNUSE(fp, p); 2616 return (error); 2617 } 2618 2619 /* 2620 * Set the access and modification times given a path name; this 2621 * version does not follow links. 2622 */ 2623 /* ARGSUSED */ 2624 int 2625 sys_lutimes(l, v, retval) 2626 struct lwp *l; 2627 void *v; 2628 register_t *retval; 2629 { 2630 struct sys_lutimes_args /* { 2631 syscallarg(const char *) path; 2632 syscallarg(const struct timeval *) tptr; 2633 } */ *uap = v; 2634 struct proc *p = l->l_proc; 2635 int error; 2636 struct nameidata nd; 2637 2638 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2639 if ((error = namei(&nd)) != 0) 2640 return (error); 2641 2642 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2643 2644 vrele(nd.ni_vp); 2645 return (error); 2646 } 2647 2648 /* 2649 * Common routine to set access and modification times given a vnode. 2650 */ 2651 static int 2652 change_utimes(vp, tptr, p) 2653 struct vnode *vp; 2654 const struct timeval *tptr; 2655 struct proc *p; 2656 { 2657 struct timeval tv[2]; 2658 struct vattr vattr; 2659 int error; 2660 2661 VATTR_NULL(&vattr); 2662 if (tptr == NULL) { 2663 microtime(&tv[0]); 2664 tv[1] = tv[0]; 2665 vattr.va_vaflags |= VA_UTIMES_NULL; 2666 } else { 2667 error = copyin(tptr, tv, sizeof(tv)); 2668 if (error) 2669 return (error); 2670 } 2671 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2672 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2673 vattr.va_atime.tv_sec = tv[0].tv_sec; 2674 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2675 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2676 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2677 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2678 VOP_UNLOCK(vp, 0); 2679 return (error); 2680 } 2681 2682 /* 2683 * Truncate a file given its path name. 2684 */ 2685 /* ARGSUSED */ 2686 int 2687 sys_truncate(l, v, retval) 2688 struct lwp *l; 2689 void *v; 2690 register_t *retval; 2691 { 2692 struct sys_truncate_args /* { 2693 syscallarg(const char *) path; 2694 syscallarg(int) pad; 2695 syscallarg(off_t) length; 2696 } */ *uap = v; 2697 struct proc *p = l->l_proc; 2698 struct vnode *vp; 2699 struct vattr vattr; 2700 int error; 2701 struct nameidata nd; 2702 2703 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2704 if ((error = namei(&nd)) != 0) 2705 return (error); 2706 vp = nd.ni_vp; 2707 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2708 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2709 if (vp->v_type == VDIR) 2710 error = EISDIR; 2711 else if ((error = vn_writechk(vp)) == 0 && 2712 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2713 VATTR_NULL(&vattr); 2714 vattr.va_size = SCARG(uap, length); 2715 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2716 } 2717 vput(vp); 2718 return (error); 2719 } 2720 2721 /* 2722 * Truncate a file given a file descriptor. 2723 */ 2724 /* ARGSUSED */ 2725 int 2726 sys_ftruncate(l, v, retval) 2727 struct lwp *l; 2728 void *v; 2729 register_t *retval; 2730 { 2731 struct sys_ftruncate_args /* { 2732 syscallarg(int) fd; 2733 syscallarg(int) pad; 2734 syscallarg(off_t) length; 2735 } */ *uap = v; 2736 struct proc *p = l->l_proc; 2737 struct vattr vattr; 2738 struct vnode *vp; 2739 struct file *fp; 2740 int error; 2741 2742 /* getvnode() will use the descriptor for us */ 2743 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2744 return (error); 2745 if ((fp->f_flag & FWRITE) == 0) { 2746 error = EINVAL; 2747 goto out; 2748 } 2749 vp = (struct vnode *)fp->f_data; 2750 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2751 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2752 if (vp->v_type == VDIR) 2753 error = EISDIR; 2754 else if ((error = vn_writechk(vp)) == 0) { 2755 VATTR_NULL(&vattr); 2756 vattr.va_size = SCARG(uap, length); 2757 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2758 } 2759 VOP_UNLOCK(vp, 0); 2760 out: 2761 FILE_UNUSE(fp, p); 2762 return (error); 2763 } 2764 2765 /* 2766 * Sync an open file. 2767 */ 2768 /* ARGSUSED */ 2769 int 2770 sys_fsync(l, v, retval) 2771 struct lwp *l; 2772 void *v; 2773 register_t *retval; 2774 { 2775 struct sys_fsync_args /* { 2776 syscallarg(int) fd; 2777 } */ *uap = v; 2778 struct proc *p = l->l_proc; 2779 struct vnode *vp; 2780 struct file *fp; 2781 int error; 2782 2783 /* getvnode() will use the descriptor for us */ 2784 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2785 return (error); 2786 vp = (struct vnode *)fp->f_data; 2787 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2788 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2789 if (error == 0 && bioops.io_fsync != NULL && 2790 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2791 (*bioops.io_fsync)(vp); 2792 VOP_UNLOCK(vp, 0); 2793 FILE_UNUSE(fp, p); 2794 return (error); 2795 } 2796 2797 /* 2798 * Sync the data of an open file. 2799 */ 2800 /* ARGSUSED */ 2801 int 2802 sys_fdatasync(l, v, retval) 2803 struct lwp *l; 2804 void *v; 2805 register_t *retval; 2806 { 2807 struct sys_fdatasync_args /* { 2808 syscallarg(int) fd; 2809 } */ *uap = v; 2810 struct proc *p = l->l_proc; 2811 struct vnode *vp; 2812 struct file *fp; 2813 int error; 2814 2815 /* getvnode() will use the descriptor for us */ 2816 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2817 return (error); 2818 vp = (struct vnode *)fp->f_data; 2819 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2820 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2821 VOP_UNLOCK(vp, 0); 2822 FILE_UNUSE(fp, p); 2823 return (error); 2824 } 2825 2826 /* 2827 * Rename files, (standard) BSD semantics frontend. 2828 */ 2829 /* ARGSUSED */ 2830 int 2831 sys_rename(l, v, retval) 2832 struct lwp *l; 2833 void *v; 2834 register_t *retval; 2835 { 2836 struct sys_rename_args /* { 2837 syscallarg(const char *) from; 2838 syscallarg(const char *) to; 2839 } */ *uap = v; 2840 struct proc *p = l->l_proc; 2841 2842 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2843 } 2844 2845 /* 2846 * Rename files, POSIX semantics frontend. 2847 */ 2848 /* ARGSUSED */ 2849 int 2850 sys___posix_rename(l, v, retval) 2851 struct lwp *l; 2852 void *v; 2853 register_t *retval; 2854 { 2855 struct sys___posix_rename_args /* { 2856 syscallarg(const char *) from; 2857 syscallarg(const char *) to; 2858 } */ *uap = v; 2859 struct proc *p = l->l_proc; 2860 2861 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2862 } 2863 2864 /* 2865 * Rename files. Source and destination must either both be directories, 2866 * or both not be directories. If target is a directory, it must be empty. 2867 * If `from' and `to' refer to the same object, the value of the `retain' 2868 * argument is used to determine whether `from' will be 2869 * 2870 * (retain == 0) deleted unless `from' and `to' refer to the same 2871 * object in the file system's name space (BSD). 2872 * (retain == 1) always retained (POSIX). 2873 */ 2874 static int 2875 rename_files(from, to, p, retain) 2876 const char *from, *to; 2877 struct proc *p; 2878 int retain; 2879 { 2880 struct vnode *tvp, *fvp, *tdvp; 2881 struct nameidata fromnd, tond; 2882 int error; 2883 2884 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2885 from, p); 2886 if ((error = namei(&fromnd)) != 0) 2887 return (error); 2888 fvp = fromnd.ni_vp; 2889 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2890 UIO_USERSPACE, to, p); 2891 if ((error = namei(&tond)) != 0) { 2892 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2893 vrele(fromnd.ni_dvp); 2894 vrele(fvp); 2895 goto out1; 2896 } 2897 tdvp = tond.ni_dvp; 2898 tvp = tond.ni_vp; 2899 2900 if (tvp != NULL) { 2901 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2902 error = ENOTDIR; 2903 goto out; 2904 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2905 error = EISDIR; 2906 goto out; 2907 } 2908 } 2909 2910 if (fvp == tdvp) 2911 error = EINVAL; 2912 2913 /* 2914 * Source and destination refer to the same object. 2915 */ 2916 if (fvp == tvp) { 2917 if (retain) 2918 error = -1; 2919 else if (fromnd.ni_dvp == tdvp && 2920 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2921 !memcmp(fromnd.ni_cnd.cn_nameptr, 2922 tond.ni_cnd.cn_nameptr, 2923 fromnd.ni_cnd.cn_namelen)) 2924 error = -1; 2925 } 2926 2927 out: 2928 if (!error) { 2929 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2930 if (fromnd.ni_dvp != tdvp) 2931 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2932 if (tvp) { 2933 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2934 } 2935 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2936 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2937 } else { 2938 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2939 if (tdvp == tvp) 2940 vrele(tdvp); 2941 else 2942 vput(tdvp); 2943 if (tvp) 2944 vput(tvp); 2945 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2946 vrele(fromnd.ni_dvp); 2947 vrele(fvp); 2948 } 2949 vrele(tond.ni_startdir); 2950 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2951 out1: 2952 if (fromnd.ni_startdir) 2953 vrele(fromnd.ni_startdir); 2954 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2955 return (error == -1 ? 0 : error); 2956 } 2957 2958 /* 2959 * Make a directory file. 2960 */ 2961 /* ARGSUSED */ 2962 int 2963 sys_mkdir(l, v, retval) 2964 struct lwp *l; 2965 void *v; 2966 register_t *retval; 2967 { 2968 struct sys_mkdir_args /* { 2969 syscallarg(const char *) path; 2970 syscallarg(int) mode; 2971 } */ *uap = v; 2972 struct proc *p = l->l_proc; 2973 struct vnode *vp; 2974 struct vattr vattr; 2975 int error; 2976 struct nameidata nd; 2977 2978 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2979 if ((error = namei(&nd)) != 0) 2980 return (error); 2981 vp = nd.ni_vp; 2982 if (vp != NULL) { 2983 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2984 if (nd.ni_dvp == vp) 2985 vrele(nd.ni_dvp); 2986 else 2987 vput(nd.ni_dvp); 2988 vrele(vp); 2989 return (EEXIST); 2990 } 2991 VATTR_NULL(&vattr); 2992 vattr.va_type = VDIR; 2993 vattr.va_mode = 2994 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2995 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2996 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2997 if (!error) 2998 vput(nd.ni_vp); 2999 return (error); 3000 } 3001 3002 /* 3003 * Remove a directory file. 3004 */ 3005 /* ARGSUSED */ 3006 int 3007 sys_rmdir(l, v, retval) 3008 struct lwp *l; 3009 void *v; 3010 register_t *retval; 3011 { 3012 struct sys_rmdir_args /* { 3013 syscallarg(const char *) path; 3014 } */ *uap = v; 3015 struct proc *p = l->l_proc; 3016 struct vnode *vp; 3017 int error; 3018 struct nameidata nd; 3019 3020 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3021 SCARG(uap, path), p); 3022 if ((error = namei(&nd)) != 0) 3023 return (error); 3024 vp = nd.ni_vp; 3025 if (vp->v_type != VDIR) { 3026 error = ENOTDIR; 3027 goto out; 3028 } 3029 /* 3030 * No rmdir "." please. 3031 */ 3032 if (nd.ni_dvp == vp) { 3033 error = EINVAL; 3034 goto out; 3035 } 3036 /* 3037 * The root of a mounted filesystem cannot be deleted. 3038 */ 3039 if (vp->v_flag & VROOT) 3040 error = EBUSY; 3041 out: 3042 if (!error) { 3043 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3044 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3045 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3046 } else { 3047 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3048 if (nd.ni_dvp == vp) 3049 vrele(nd.ni_dvp); 3050 else 3051 vput(nd.ni_dvp); 3052 vput(vp); 3053 } 3054 return (error); 3055 } 3056 3057 /* 3058 * Read a block of directory entries in a file system independent format. 3059 */ 3060 int 3061 sys_getdents(l, v, retval) 3062 struct lwp *l; 3063 void *v; 3064 register_t *retval; 3065 { 3066 struct sys_getdents_args /* { 3067 syscallarg(int) fd; 3068 syscallarg(char *) buf; 3069 syscallarg(size_t) count; 3070 } */ *uap = v; 3071 struct proc *p = l->l_proc; 3072 struct file *fp; 3073 int error, done; 3074 3075 /* getvnode() will use the descriptor for us */ 3076 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3077 return (error); 3078 if ((fp->f_flag & FREAD) == 0) { 3079 error = EBADF; 3080 goto out; 3081 } 3082 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3083 SCARG(uap, count), &done, p, 0, 0); 3084 *retval = done; 3085 out: 3086 FILE_UNUSE(fp, p); 3087 return (error); 3088 } 3089 3090 /* 3091 * Set the mode mask for creation of filesystem nodes. 3092 */ 3093 int 3094 sys_umask(l, v, retval) 3095 struct lwp *l; 3096 void *v; 3097 register_t *retval; 3098 { 3099 struct sys_umask_args /* { 3100 syscallarg(mode_t) newmask; 3101 } */ *uap = v; 3102 struct proc *p = l->l_proc; 3103 struct cwdinfo *cwdi; 3104 3105 cwdi = p->p_cwdi; 3106 *retval = cwdi->cwdi_cmask; 3107 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3108 return (0); 3109 } 3110 3111 /* 3112 * Void all references to file by ripping underlying filesystem 3113 * away from vnode. 3114 */ 3115 /* ARGSUSED */ 3116 int 3117 sys_revoke(l, v, retval) 3118 struct lwp *l; 3119 void *v; 3120 register_t *retval; 3121 { 3122 struct sys_revoke_args /* { 3123 syscallarg(const char *) path; 3124 } */ *uap = v; 3125 struct proc *p = l->l_proc; 3126 struct vnode *vp; 3127 struct vattr vattr; 3128 int error; 3129 struct nameidata nd; 3130 3131 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3132 if ((error = namei(&nd)) != 0) 3133 return (error); 3134 vp = nd.ni_vp; 3135 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3136 goto out; 3137 if (p->p_ucred->cr_uid != vattr.va_uid && 3138 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3139 goto out; 3140 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3141 VOP_REVOKE(vp, REVOKEALL); 3142 out: 3143 vrele(vp); 3144 return (error); 3145 } 3146 3147 /* 3148 * Convert a user file descriptor to a kernel file entry. 3149 */ 3150 int 3151 getvnode(fdp, fd, fpp) 3152 struct filedesc *fdp; 3153 int fd; 3154 struct file **fpp; 3155 { 3156 struct vnode *vp; 3157 struct file *fp; 3158 3159 if ((fp = fd_getfile(fdp, fd)) == NULL) 3160 return (EBADF); 3161 3162 FILE_USE(fp); 3163 3164 if (fp->f_type != DTYPE_VNODE) { 3165 FILE_UNUSE(fp, NULL); 3166 return (EINVAL); 3167 } 3168 3169 vp = (struct vnode *)fp->f_data; 3170 if (vp->v_type == VBAD) { 3171 FILE_UNUSE(fp, NULL); 3172 return (EBADF); 3173 } 3174 3175 *fpp = fp; 3176 return (0); 3177 } 3178
Indexes created Sat Sep 27 14:09:57 GMT 2025