vfs_syscalls.c revision 1.174
1 /* $NetBSD: vfs_syscalls.c,v 1.174 2002/05/11 00:45:06 enami 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 1.174 2002/05/11 00:45:06 enami 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/syscallargs.h> 64 65 #include <miscfs/genfs/genfs.h> 66 #include <miscfs/syncfs/syncfs.h> 67 68 static int change_dir __P((struct nameidata *, struct proc *)); 69 static int change_flags __P((struct vnode *, u_long, struct proc *)); 70 static int change_mode __P((struct vnode *, int, struct proc *p)); 71 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 72 int)); 73 static int change_utimes __P((struct vnode *vp, const struct timeval *, 74 struct proc *p)); 75 static int rename_files __P((const char *, const char *, struct proc *, int)); 76 77 void checkdirs __P((struct vnode *)); 78 79 int dovfsusermount = 0; 80 81 /* 82 * Virtual File System System Calls 83 */ 84 85 /* 86 * Mount a file system. 87 */ 88 89 #if defined(COMPAT_09) || defined(COMPAT_43) 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 * Do not modify this table. It should only contain filesystems 95 * supported by NetBSD 0.9 and 4.3BSD. 96 */ 97 const char * const mountcompatnames[] = { 98 NULL, /* 0 = MOUNT_NONE */ 99 MOUNT_FFS, /* 1 = MOUNT_UFS */ 100 MOUNT_NFS, /* 2 */ 101 MOUNT_MFS, /* 3 */ 102 MOUNT_MSDOS, /* 4 */ 103 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 104 MOUNT_FDESC, /* 6 */ 105 MOUNT_KERNFS, /* 7 */ 106 NULL, /* 8 = MOUNT_DEVFS */ 107 MOUNT_AFS, /* 9 */ 108 }; 109 const int nmountcompatnames = sizeof(mountcompatnames) / 110 sizeof(mountcompatnames[0]); 111 #endif /* COMPAT_09 || COMPAT_43 */ 112 113 /* ARGSUSED */ 114 int 115 sys_mount(p, v, retval) 116 struct proc *p; 117 void *v; 118 register_t *retval; 119 { 120 struct sys_mount_args /* { 121 syscallarg(const char *) type; 122 syscallarg(const char *) path; 123 syscallarg(int) flags; 124 syscallarg(void *) data; 125 } */ *uap = v; 126 struct vnode *vp; 127 struct mount *mp; 128 int error, flag = 0; 129 char fstypename[MFSNAMELEN]; 130 struct vattr va; 131 struct nameidata nd; 132 struct vfsops *vfs; 133 134 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 135 return (error); 136 /* 137 * Get vnode to be covered 138 */ 139 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 140 SCARG(uap, path), p); 141 if ((error = namei(&nd)) != 0) 142 return (error); 143 vp = nd.ni_vp; 144 /* 145 * A lookup in VFS_MOUNT might result in an attempt to 146 * lock this vnode again, so make the lock resursive. 147 */ 148 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 149 if (SCARG(uap, flags) & MNT_UPDATE) { 150 if ((vp->v_flag & VROOT) == 0) { 151 vput(vp); 152 return (EINVAL); 153 } 154 mp = vp->v_mount; 155 flag = mp->mnt_flag; 156 vfs = mp->mnt_op; 157 /* 158 * We only allow the filesystem to be reloaded if it 159 * is currently mounted read-only. 160 */ 161 if ((SCARG(uap, flags) & MNT_RELOAD) && 162 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 163 vput(vp); 164 return (EOPNOTSUPP); /* Needs translation */ 165 } 166 /* 167 * In "highly secure" mode, don't let the caller do anything 168 * but downgrade a filesystem from read-write to read-only. 169 * (see also below; MNT_UPDATE is required.) 170 */ 171 if (securelevel >= 2 && 172 (SCARG(uap, flags) != 173 (mp->mnt_flag | MNT_RDONLY | 174 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 175 vput(vp); 176 return (EPERM); 177 } 178 mp->mnt_flag |= 179 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 180 /* 181 * Only root, or the user that did the original mount is 182 * permitted to update it. 183 */ 184 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 185 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 186 vput(vp); 187 return (error); 188 } 189 /* 190 * Do not allow NFS export by non-root users. For non-root 191 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 192 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 193 */ 194 if (p->p_ucred->cr_uid != 0) { 195 if (SCARG(uap, flags) & MNT_EXPORTED) { 196 vput(vp); 197 return (EPERM); 198 } 199 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 200 if (flag & MNT_NOEXEC) 201 SCARG(uap, flags) |= MNT_NOEXEC; 202 } 203 if (vfs_busy(mp, LK_NOWAIT, 0)) { 204 vput(vp); 205 return (EPERM); 206 } 207 goto update; 208 } else { 209 if (securelevel >= 2) { 210 vput(vp); 211 return (EPERM); 212 } 213 } 214 /* 215 * If the user is not root, ensure that they own the directory 216 * onto which we are attempting to mount. 217 */ 218 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 219 (va.va_uid != p->p_ucred->cr_uid && 220 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 221 vput(vp); 222 return (error); 223 } 224 /* 225 * Do not allow NFS export by non-root users. For non-root users, 226 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 227 * mount point is already MNT_NOEXEC. 228 */ 229 if (p->p_ucred->cr_uid != 0) { 230 if (SCARG(uap, flags) & MNT_EXPORTED) { 231 vput(vp); 232 return (EPERM); 233 } 234 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 235 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 236 SCARG(uap, flags) |= MNT_NOEXEC; 237 } 238 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 239 return (error); 240 if (vp->v_type != VDIR) { 241 vput(vp); 242 return (ENOTDIR); 243 } 244 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 245 if (error) { 246 #if defined(COMPAT_09) || defined(COMPAT_43) 247 /* 248 * Historically filesystem types were identified by number. 249 * If we get an integer for the filesystem type instead of a 250 * string, we check to see if it matches one of the historic 251 * filesystem types. 252 */ 253 u_long fsindex = (u_long)SCARG(uap, type); 254 if (fsindex >= nmountcompatnames || 255 mountcompatnames[fsindex] == NULL) { 256 vput(vp); 257 return (ENODEV); 258 } 259 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 260 #else 261 vput(vp); 262 return (error); 263 #endif 264 } 265 #ifdef COMPAT_10 266 /* Accept `ufs' as an alias for `ffs'. */ 267 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 268 strncpy(fstypename, "ffs", MFSNAMELEN); 269 #endif 270 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 271 vput(vp); 272 return (ENODEV); 273 } 274 if (vp->v_mountedhere != NULL) { 275 vput(vp); 276 return (EBUSY); 277 } 278 279 /* 280 * Allocate and initialize the file system. 281 */ 282 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 283 M_MOUNT, M_WAITOK); 284 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 285 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 286 (void)vfs_busy(mp, LK_NOWAIT, 0); 287 mp->mnt_op = vfs; 288 vfs->vfs_refcount++; 289 mp->mnt_vnodecovered = vp; 290 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 291 mp->mnt_unmounter = NULL; 292 update: 293 /* 294 * Set the mount level flags. 295 */ 296 if (SCARG(uap, flags) & MNT_RDONLY) 297 mp->mnt_flag |= MNT_RDONLY; 298 else if (mp->mnt_flag & MNT_RDONLY) 299 mp->mnt_flag |= MNT_WANTRDWR; 300 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 301 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 302 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 303 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 304 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 305 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 306 MNT_SYMPERM | MNT_SOFTDEP); 307 /* 308 * Mount the filesystem. 309 */ 310 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 311 if (mp->mnt_flag & MNT_UPDATE) { 312 if (mp->mnt_flag & MNT_WANTRDWR) 313 mp->mnt_flag &= ~MNT_RDONLY; 314 mp->mnt_flag &=~ 315 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 316 if (error) 317 mp->mnt_flag = flag; 318 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 319 if (mp->mnt_syncer == NULL) 320 error = vfs_allocate_syncvnode(mp); 321 } else { 322 if (mp->mnt_syncer != NULL) 323 vfs_deallocate_syncvnode(mp); 324 } 325 vfs_unbusy(mp); 326 VOP_UNLOCK(vp, 0); 327 vrele(vp); 328 return (error); 329 } 330 /* 331 * Put the new filesystem on the mount list after root. 332 */ 333 cache_purge(vp); 334 if (!error) { 335 vp->v_mountedhere = mp; 336 simple_lock(&mountlist_slock); 337 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 338 simple_unlock(&mountlist_slock); 339 checkdirs(vp); 340 VOP_UNLOCK(vp, 0); 341 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 342 error = vfs_allocate_syncvnode(mp); 343 vfs_unbusy(mp); 344 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 345 if ((error = VFS_START(mp, 0, p))) 346 vrele(vp); 347 } else { 348 vp->v_mountedhere = (struct mount *)0; 349 vfs->vfs_refcount--; 350 vfs_unbusy(mp); 351 free((caddr_t)mp, M_MOUNT); 352 vput(vp); 353 } 354 return (error); 355 } 356 357 /* 358 * Scan all active processes to see if any of them have a current 359 * or root directory onto which the new filesystem has just been 360 * mounted. If so, replace them with the new mount point. 361 */ 362 void 363 checkdirs(olddp) 364 struct vnode *olddp; 365 { 366 struct cwdinfo *cwdi; 367 struct vnode *newdp; 368 struct proc *p; 369 370 if (olddp->v_usecount == 1) 371 return; 372 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 373 panic("mount: lost mount"); 374 proclist_lock_read(); 375 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 376 cwdi = p->p_cwdi; 377 if (cwdi->cwdi_cdir == olddp) { 378 vrele(cwdi->cwdi_cdir); 379 VREF(newdp); 380 cwdi->cwdi_cdir = newdp; 381 } 382 if (cwdi->cwdi_rdir == olddp) { 383 vrele(cwdi->cwdi_rdir); 384 VREF(newdp); 385 cwdi->cwdi_rdir = newdp; 386 } 387 } 388 proclist_unlock_read(); 389 if (rootvnode == olddp) { 390 vrele(rootvnode); 391 VREF(newdp); 392 rootvnode = newdp; 393 } 394 vput(newdp); 395 } 396 397 /* 398 * Unmount a file system. 399 * 400 * Note: unmount takes a path to the vnode mounted on as argument, 401 * not special file (as before). 402 */ 403 /* ARGSUSED */ 404 int 405 sys_unmount(p, v, retval) 406 struct proc *p; 407 void *v; 408 register_t *retval; 409 { 410 struct sys_unmount_args /* { 411 syscallarg(const char *) path; 412 syscallarg(int) flags; 413 } */ *uap = v; 414 struct vnode *vp; 415 struct mount *mp; 416 int error; 417 struct nameidata nd; 418 419 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 420 SCARG(uap, path), p); 421 if ((error = namei(&nd)) != 0) 422 return (error); 423 vp = nd.ni_vp; 424 mp = vp->v_mount; 425 426 /* 427 * Only root, or the user that did the original mount is 428 * permitted to unmount this filesystem. 429 */ 430 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 431 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 432 vput(vp); 433 return (error); 434 } 435 436 /* 437 * Don't allow unmounting the root file system. 438 */ 439 if (mp->mnt_flag & MNT_ROOTFS) { 440 vput(vp); 441 return (EINVAL); 442 } 443 444 /* 445 * Must be the root of the filesystem 446 */ 447 if ((vp->v_flag & VROOT) == 0) { 448 vput(vp); 449 return (EINVAL); 450 } 451 vput(vp); 452 453 /* 454 * XXX Freeze syncer. Must do this before locking the 455 * mount point. See dounmount() for details. 456 */ 457 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 458 459 if (vfs_busy(mp, 0, 0)) { 460 lockmgr(&syncer_lock, LK_RELEASE, NULL); 461 return (EBUSY); 462 } 463 464 return (dounmount(mp, SCARG(uap, flags), p)); 465 } 466 467 /* 468 * Do the actual file system unmount. File system is assumed to have been 469 * marked busy by the caller. 470 */ 471 int 472 dounmount(mp, flags, p) 473 struct mount *mp; 474 int flags; 475 struct proc *p; 476 { 477 struct vnode *coveredvp; 478 int error; 479 int async; 480 int used_syncer; 481 482 simple_lock(&mountlist_slock); 483 vfs_unbusy(mp); 484 used_syncer = (mp->mnt_syncer != NULL); 485 486 /* 487 * XXX Syncer must be frozen when we get here. This should really 488 * be done on a per-mountpoint basis, but especially the softdep 489 * code possibly called from the syncer doens't exactly work on a 490 * per-mountpoint basis, so the softdep code would become a maze 491 * of vfs_busy() calls. 492 * 493 * The caller of dounmount() must acquire syncer_lock because 494 * the syncer itself acquires locks in syncer_lock -> vfs_busy 495 * order, and we must preserve that order to avoid deadlock. 496 * 497 * So, if the file system did not use the syncer, now is 498 * the time to release the syncer_lock. 499 */ 500 if (used_syncer == 0) 501 lockmgr(&syncer_lock, LK_RELEASE, NULL); 502 503 mp->mnt_flag |= MNT_UNMOUNT; 504 mp->mnt_unmounter = p; 505 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 506 if (mp->mnt_flag & MNT_EXPUBLIC) 507 vfs_setpublicfs(NULL, NULL, NULL); 508 async = mp->mnt_flag & MNT_ASYNC; 509 mp->mnt_flag &= ~MNT_ASYNC; 510 cache_purgevfs(mp); /* remove cache entries for this file sys */ 511 if (mp->mnt_syncer != NULL) 512 vfs_deallocate_syncvnode(mp); 513 if (((mp->mnt_flag & MNT_RDONLY) || 514 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 515 (flags & MNT_FORCE)) 516 error = VFS_UNMOUNT(mp, flags, p); 517 simple_lock(&mountlist_slock); 518 if (error) { 519 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 520 (void) vfs_allocate_syncvnode(mp); 521 mp->mnt_flag &= ~MNT_UNMOUNT; 522 mp->mnt_unmounter = NULL; 523 mp->mnt_flag |= async; 524 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 525 &mountlist_slock); 526 if (used_syncer) 527 lockmgr(&syncer_lock, LK_RELEASE, NULL); 528 while (mp->mnt_wcnt > 0) { 529 wakeup((caddr_t)mp); 530 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 531 } 532 return (error); 533 } 534 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 535 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 536 coveredvp->v_mountedhere = NULL; 537 vrele(coveredvp); 538 } 539 mp->mnt_op->vfs_refcount--; 540 if (mp->mnt_vnodelist.lh_first != NULL) 541 panic("unmount: dangling vnode"); 542 mp->mnt_flag |= MNT_GONE; 543 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 544 if (used_syncer) 545 lockmgr(&syncer_lock, LK_RELEASE, NULL); 546 while(mp->mnt_wcnt > 0) { 547 wakeup((caddr_t)mp); 548 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 549 } 550 free((caddr_t)mp, M_MOUNT); 551 return (0); 552 } 553 554 /* 555 * Sync each mounted filesystem. 556 */ 557 #ifdef DEBUG 558 int syncprt = 0; 559 struct ctldebug debug0 = { "syncprt", &syncprt }; 560 #endif 561 562 /* ARGSUSED */ 563 int 564 sys_sync(p, v, retval) 565 struct proc *p; 566 void *v; 567 register_t *retval; 568 { 569 struct mount *mp, *nmp; 570 int asyncflag; 571 572 simple_lock(&mountlist_slock); 573 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 574 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 575 nmp = mp->mnt_list.cqe_prev; 576 continue; 577 } 578 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 579 asyncflag = mp->mnt_flag & MNT_ASYNC; 580 mp->mnt_flag &= ~MNT_ASYNC; 581 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 582 if (asyncflag) 583 mp->mnt_flag |= MNT_ASYNC; 584 } 585 simple_lock(&mountlist_slock); 586 nmp = mp->mnt_list.cqe_prev; 587 vfs_unbusy(mp); 588 589 } 590 simple_unlock(&mountlist_slock); 591 #ifdef DEBUG 592 if (syncprt) 593 vfs_bufstats(); 594 #endif /* DEBUG */ 595 return (0); 596 } 597 598 /* 599 * Change filesystem quotas. 600 */ 601 /* ARGSUSED */ 602 int 603 sys_quotactl(p, v, retval) 604 struct proc *p; 605 void *v; 606 register_t *retval; 607 { 608 struct sys_quotactl_args /* { 609 syscallarg(const char *) path; 610 syscallarg(int) cmd; 611 syscallarg(int) uid; 612 syscallarg(caddr_t) arg; 613 } */ *uap = v; 614 struct mount *mp; 615 int error; 616 struct nameidata nd; 617 618 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 619 if ((error = namei(&nd)) != 0) 620 return (error); 621 mp = nd.ni_vp->v_mount; 622 vrele(nd.ni_vp); 623 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 624 SCARG(uap, arg), p)); 625 } 626 627 /* 628 * Get filesystem statistics. 629 */ 630 /* ARGSUSED */ 631 int 632 sys_statfs(p, v, retval) 633 struct proc *p; 634 void *v; 635 register_t *retval; 636 { 637 struct sys_statfs_args /* { 638 syscallarg(const char *) path; 639 syscallarg(struct statfs *) buf; 640 } */ *uap = v; 641 struct mount *mp; 642 struct statfs *sp; 643 int error; 644 struct nameidata nd; 645 646 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 647 if ((error = namei(&nd)) != 0) 648 return (error); 649 mp = nd.ni_vp->v_mount; 650 sp = &mp->mnt_stat; 651 vrele(nd.ni_vp); 652 if ((error = VFS_STATFS(mp, sp, p)) != 0) 653 return (error); 654 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 655 sp->f_oflags = sp->f_flags & 0xffff; 656 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 657 } 658 659 /* 660 * Get filesystem statistics. 661 */ 662 /* ARGSUSED */ 663 int 664 sys_fstatfs(p, v, retval) 665 struct proc *p; 666 void *v; 667 register_t *retval; 668 { 669 struct sys_fstatfs_args /* { 670 syscallarg(int) fd; 671 syscallarg(struct statfs *) buf; 672 } */ *uap = v; 673 struct file *fp; 674 struct mount *mp; 675 struct statfs *sp; 676 int error; 677 678 /* getvnode() will use the descriptor for us */ 679 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 680 return (error); 681 mp = ((struct vnode *)fp->f_data)->v_mount; 682 sp = &mp->mnt_stat; 683 if ((error = VFS_STATFS(mp, sp, p)) != 0) 684 goto out; 685 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 686 sp->f_oflags = sp->f_flags & 0xffff; 687 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 688 out: 689 FILE_UNUSE(fp, p); 690 return (error); 691 } 692 693 /* 694 * Get statistics on all filesystems. 695 */ 696 int 697 sys_getfsstat(p, v, retval) 698 struct proc *p; 699 void *v; 700 register_t *retval; 701 { 702 struct sys_getfsstat_args /* { 703 syscallarg(struct statfs *) buf; 704 syscallarg(long) bufsize; 705 syscallarg(int) flags; 706 } */ *uap = v; 707 struct mount *mp, *nmp; 708 struct statfs *sp; 709 caddr_t sfsp; 710 long count, maxcount, error; 711 712 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 713 sfsp = (caddr_t)SCARG(uap, buf); 714 simple_lock(&mountlist_slock); 715 count = 0; 716 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 717 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 718 nmp = mp->mnt_list.cqe_next; 719 continue; 720 } 721 if (sfsp && count < maxcount) { 722 sp = &mp->mnt_stat; 723 /* 724 * If MNT_NOWAIT or MNT_LAZY is specified, do not 725 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 726 * overrides MNT_NOWAIT. 727 */ 728 if (SCARG(uap, flags) != MNT_NOWAIT && 729 SCARG(uap, flags) != MNT_LAZY && 730 (SCARG(uap, flags) == MNT_WAIT || 731 SCARG(uap, flags) == 0) && 732 (error = VFS_STATFS(mp, sp, p)) != 0) { 733 simple_lock(&mountlist_slock); 734 nmp = mp->mnt_list.cqe_next; 735 vfs_unbusy(mp); 736 continue; 737 } 738 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 739 sp->f_oflags = sp->f_flags & 0xffff; 740 error = copyout(sp, sfsp, sizeof(*sp)); 741 if (error) { 742 vfs_unbusy(mp); 743 return (error); 744 } 745 sfsp += sizeof(*sp); 746 } 747 count++; 748 simple_lock(&mountlist_slock); 749 nmp = mp->mnt_list.cqe_next; 750 vfs_unbusy(mp); 751 } 752 simple_unlock(&mountlist_slock); 753 if (sfsp && count > maxcount) 754 *retval = maxcount; 755 else 756 *retval = count; 757 return (0); 758 } 759 760 /* 761 * Change current working directory to a given file descriptor. 762 */ 763 /* ARGSUSED */ 764 int 765 sys_fchdir(p, v, retval) 766 struct proc *p; 767 void *v; 768 register_t *retval; 769 { 770 struct sys_fchdir_args /* { 771 syscallarg(int) fd; 772 } */ *uap = v; 773 struct filedesc *fdp = p->p_fd; 774 struct cwdinfo *cwdi = p->p_cwdi; 775 struct vnode *vp, *tdp; 776 struct mount *mp; 777 struct file *fp; 778 int error; 779 780 /* getvnode() will use the descriptor for us */ 781 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 782 return (error); 783 vp = (struct vnode *)fp->f_data; 784 785 VREF(vp); 786 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 787 if (vp->v_type != VDIR) 788 error = ENOTDIR; 789 else 790 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 791 while (!error && (mp = vp->v_mountedhere) != NULL) { 792 if (vfs_busy(mp, 0, 0)) 793 continue; 794 error = VFS_ROOT(mp, &tdp); 795 vfs_unbusy(mp); 796 if (error) 797 break; 798 vput(vp); 799 vp = tdp; 800 } 801 if (error) { 802 vput(vp); 803 goto out; 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* 808 * Disallow changing to a directory not under the process's 809 * current root directory (if there is one). 810 */ 811 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 812 vrele(vp); 813 error = EPERM; /* operation not permitted */ 814 goto out; 815 } 816 817 vrele(cwdi->cwdi_cdir); 818 cwdi->cwdi_cdir = vp; 819 out: 820 FILE_UNUSE(fp, p); 821 return (error); 822 } 823 824 /* 825 * Change this process's notion of the root directory to a given file descriptor. 826 */ 827 828 int 829 sys_fchroot(p, v, retval) 830 struct proc *p; 831 void *v; 832 register_t *retval; 833 { 834 struct sys_fchroot_args *uap = v; 835 struct filedesc *fdp = p->p_fd; 836 struct cwdinfo *cwdi = p->p_cwdi; 837 struct vnode *vp; 838 struct file *fp; 839 int error; 840 841 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 842 return error; 843 /* getvnode() will use the descriptor for us */ 844 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 845 return error; 846 vp = (struct vnode *) fp->f_data; 847 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 848 if (vp->v_type != VDIR) 849 error = ENOTDIR; 850 else 851 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 852 VOP_UNLOCK(vp, 0); 853 if (error) 854 goto out; 855 VREF(vp); 856 857 /* 858 * Prevent escaping from chroot by putting the root under 859 * the working directory. Silently chdir to / if we aren't 860 * already there. 861 */ 862 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 863 /* 864 * XXX would be more failsafe to change directory to a 865 * deadfs node here instead 866 */ 867 vrele(cwdi->cwdi_cdir); 868 VREF(vp); 869 cwdi->cwdi_cdir = vp; 870 } 871 872 if (cwdi->cwdi_rdir != NULL) 873 vrele(cwdi->cwdi_rdir); 874 cwdi->cwdi_rdir = vp; 875 out: 876 FILE_UNUSE(fp, p); 877 return (error); 878 } 879 880 881 882 /* 883 * Change current working directory (``.''). 884 */ 885 /* ARGSUSED */ 886 int 887 sys_chdir(p, v, retval) 888 struct proc *p; 889 void *v; 890 register_t *retval; 891 { 892 struct sys_chdir_args /* { 893 syscallarg(const char *) path; 894 } */ *uap = v; 895 struct cwdinfo *cwdi = p->p_cwdi; 896 int error; 897 struct nameidata nd; 898 899 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 900 SCARG(uap, path), p); 901 if ((error = change_dir(&nd, p)) != 0) 902 return (error); 903 vrele(cwdi->cwdi_cdir); 904 cwdi->cwdi_cdir = nd.ni_vp; 905 return (0); 906 } 907 908 /* 909 * Change notion of root (``/'') directory. 910 */ 911 /* ARGSUSED */ 912 int 913 sys_chroot(p, v, retval) 914 struct proc *p; 915 void *v; 916 register_t *retval; 917 { 918 struct sys_chroot_args /* { 919 syscallarg(const char *) path; 920 } */ *uap = v; 921 struct cwdinfo *cwdi = p->p_cwdi; 922 struct vnode *vp; 923 int error; 924 struct nameidata nd; 925 926 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 927 return (error); 928 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 929 SCARG(uap, path), p); 930 if ((error = change_dir(&nd, p)) != 0) 931 return (error); 932 if (cwdi->cwdi_rdir != NULL) 933 vrele(cwdi->cwdi_rdir); 934 vp = nd.ni_vp; 935 cwdi->cwdi_rdir = vp; 936 937 /* 938 * Prevent escaping from chroot by putting the root under 939 * the working directory. Silently chdir to / if we aren't 940 * already there. 941 */ 942 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 943 /* 944 * XXX would be more failsafe to change directory to a 945 * deadfs node here instead 946 */ 947 vrele(cwdi->cwdi_cdir); 948 VREF(vp); 949 cwdi->cwdi_cdir = vp; 950 } 951 952 return (0); 953 } 954 955 /* 956 * Common routine for chroot and chdir. 957 */ 958 static int 959 change_dir(ndp, p) 960 struct nameidata *ndp; 961 struct proc *p; 962 { 963 struct vnode *vp; 964 int error; 965 966 if ((error = namei(ndp)) != 0) 967 return (error); 968 vp = ndp->ni_vp; 969 if (vp->v_type != VDIR) 970 error = ENOTDIR; 971 else 972 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 973 974 if (error) 975 vput(vp); 976 else 977 VOP_UNLOCK(vp, 0); 978 return (error); 979 } 980 981 /* 982 * Check permissions, allocate an open file structure, 983 * and call the device open routine if any. 984 */ 985 int 986 sys_open(p, v, retval) 987 struct proc *p; 988 void *v; 989 register_t *retval; 990 { 991 struct sys_open_args /* { 992 syscallarg(const char *) path; 993 syscallarg(int) flags; 994 syscallarg(int) mode; 995 } */ *uap = v; 996 struct cwdinfo *cwdi = p->p_cwdi; 997 struct filedesc *fdp = p->p_fd; 998 struct file *fp; 999 struct vnode *vp; 1000 int flags, cmode; 1001 int type, indx, error; 1002 struct flock lf; 1003 struct nameidata nd; 1004 1005 flags = FFLAGS(SCARG(uap, flags)); 1006 if ((flags & (FREAD | FWRITE)) == 0) 1007 return (EINVAL); 1008 /* falloc() will use the file descriptor for us */ 1009 if ((error = falloc(p, &fp, &indx)) != 0) 1010 return (error); 1011 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1012 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1013 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1014 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1015 FILE_UNUSE(fp, p); 1016 ffree(fp); 1017 if ((error == ENODEV || error == ENXIO) && 1018 p->p_dupfd >= 0 && /* XXX from fdopen */ 1019 (error = 1020 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1021 *retval = indx; 1022 return (0); 1023 } 1024 if (error == ERESTART) 1025 error = EINTR; 1026 fdremove(fdp, indx); 1027 return (error); 1028 } 1029 p->p_dupfd = 0; 1030 vp = nd.ni_vp; 1031 fp->f_flag = flags & FMASK; 1032 fp->f_type = DTYPE_VNODE; 1033 fp->f_ops = &vnops; 1034 fp->f_data = (caddr_t)vp; 1035 if (flags & (O_EXLOCK | O_SHLOCK)) { 1036 lf.l_whence = SEEK_SET; 1037 lf.l_start = 0; 1038 lf.l_len = 0; 1039 if (flags & O_EXLOCK) 1040 lf.l_type = F_WRLCK; 1041 else 1042 lf.l_type = F_RDLCK; 1043 type = F_FLOCK; 1044 if ((flags & FNONBLOCK) == 0) 1045 type |= F_WAIT; 1046 VOP_UNLOCK(vp, 0); 1047 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1048 if (error) { 1049 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1050 FILE_UNUSE(fp, p); 1051 ffree(fp); 1052 fdremove(fdp, indx); 1053 return (error); 1054 } 1055 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1056 fp->f_flag |= FHASLOCK; 1057 } 1058 VOP_UNLOCK(vp, 0); 1059 *retval = indx; 1060 FILE_SET_MATURE(fp); 1061 FILE_UNUSE(fp, p); 1062 return (0); 1063 } 1064 1065 /* 1066 * Get file handle system call 1067 */ 1068 int 1069 sys_getfh(p, v, retval) 1070 struct proc *p; 1071 void *v; 1072 register_t *retval; 1073 { 1074 struct sys_getfh_args /* { 1075 syscallarg(char *) fname; 1076 syscallarg(fhandle_t *) fhp; 1077 } */ *uap = v; 1078 struct vnode *vp; 1079 fhandle_t fh; 1080 int error; 1081 struct nameidata nd; 1082 1083 /* 1084 * Must be super user 1085 */ 1086 error = suser(p->p_ucred, &p->p_acflag); 1087 if (error) 1088 return (error); 1089 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1090 SCARG(uap, fname), p); 1091 error = namei(&nd); 1092 if (error) 1093 return (error); 1094 vp = nd.ni_vp; 1095 memset((caddr_t)&fh, 0, sizeof(fh)); 1096 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1097 error = VFS_VPTOFH(vp, &fh.fh_fid); 1098 vput(vp); 1099 if (error) 1100 return (error); 1101 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1102 return (error); 1103 } 1104 1105 /* 1106 * Open a file given a file handle. 1107 * 1108 * Check permissions, allocate an open file structure, 1109 * and call the device open routine if any. 1110 */ 1111 int 1112 sys_fhopen(p, v, retval) 1113 struct proc *p; 1114 void *v; 1115 register_t *retval; 1116 { 1117 struct sys_fhopen_args /* { 1118 syscallarg(const fhandle_t *) fhp; 1119 syscallarg(int) flags; 1120 } */ *uap = v; 1121 struct filedesc *fdp = p->p_fd; 1122 struct file *fp; 1123 struct vnode *vp = NULL; 1124 struct mount *mp; 1125 struct ucred *cred = p->p_ucred; 1126 int flags; 1127 struct file *nfp; 1128 int type, indx, error=0; 1129 struct flock lf; 1130 struct vattr va; 1131 fhandle_t fh; 1132 1133 /* 1134 * Must be super user 1135 */ 1136 if ((error = suser(p->p_ucred, &p->p_acflag))) 1137 return (error); 1138 1139 flags = FFLAGS(SCARG(uap, flags)); 1140 if ((flags & (FREAD | FWRITE)) == 0) 1141 return (EINVAL); 1142 if ((flags & O_CREAT)) 1143 return (EINVAL); 1144 /* falloc() will use the file descriptor for us */ 1145 if ((error = falloc(p, &nfp, &indx)) != 0) 1146 return (error); 1147 fp = nfp; 1148 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1149 goto bad; 1150 1151 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1152 error = ESTALE; 1153 goto bad; 1154 } 1155 1156 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1157 vp = NULL; /* most likely unnecessary sanity for bad: */ 1158 goto bad; 1159 } 1160 1161 /* Now do an effective vn_open */ 1162 1163 if (vp->v_type == VSOCK) { 1164 error = EOPNOTSUPP; 1165 goto bad; 1166 } 1167 if (flags & FREAD) { 1168 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1169 goto bad; 1170 } 1171 if (flags & (FWRITE | O_TRUNC)) { 1172 if (vp->v_type == VDIR) { 1173 error = EISDIR; 1174 goto bad; 1175 } 1176 if ((error = vn_writechk(vp)) != 0 || 1177 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1178 goto bad; 1179 } 1180 if (flags & O_TRUNC) { 1181 VOP_UNLOCK(vp, 0); /* XXX */ 1182 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1183 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1184 VATTR_NULL(&va); 1185 va.va_size = 0; 1186 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1187 goto bad; 1188 } 1189 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1190 goto bad; 1191 if (vp->v_type == VREG && 1192 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1193 error = EIO; 1194 goto bad; 1195 } 1196 if (flags & FWRITE) 1197 vp->v_writecount++; 1198 1199 /* done with modified vn_open, now finish what sys_open does. */ 1200 1201 fp->f_flag = flags & FMASK; 1202 fp->f_type = DTYPE_VNODE; 1203 fp->f_ops = &vnops; 1204 fp->f_data = (caddr_t)vp; 1205 if (flags & (O_EXLOCK | O_SHLOCK)) { 1206 lf.l_whence = SEEK_SET; 1207 lf.l_start = 0; 1208 lf.l_len = 0; 1209 if (flags & O_EXLOCK) 1210 lf.l_type = F_WRLCK; 1211 else 1212 lf.l_type = F_RDLCK; 1213 type = F_FLOCK; 1214 if ((flags & FNONBLOCK) == 0) 1215 type |= F_WAIT; 1216 VOP_UNLOCK(vp, 0); 1217 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1218 if (error) { 1219 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1220 FILE_UNUSE(fp, p); 1221 ffree(fp); 1222 fdremove(fdp, indx); 1223 return (error); 1224 } 1225 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1226 fp->f_flag |= FHASLOCK; 1227 } 1228 VOP_UNLOCK(vp, 0); 1229 *retval = indx; 1230 FILE_SET_MATURE(fp); 1231 FILE_UNUSE(fp, p); 1232 return (0); 1233 1234 bad: 1235 FILE_UNUSE(fp, p); 1236 ffree(fp); 1237 fdremove(fdp, indx); 1238 if (vp != NULL) 1239 vput(vp); 1240 return (error); 1241 } 1242 1243 /* ARGSUSED */ 1244 int 1245 sys_fhstat(p, v, retval) 1246 struct proc *p; 1247 void *v; 1248 register_t *retval; 1249 { 1250 struct sys_fhstat_args /* { 1251 syscallarg(const fhandle_t *) fhp; 1252 syscallarg(struct stat *) sb; 1253 } */ *uap = v; 1254 struct stat sb; 1255 int error; 1256 fhandle_t fh; 1257 struct mount *mp; 1258 struct vnode *vp; 1259 1260 /* 1261 * Must be super user 1262 */ 1263 if ((error = suser(p->p_ucred, &p->p_acflag))) 1264 return (error); 1265 1266 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1267 return (error); 1268 1269 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1270 return (ESTALE); 1271 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1272 return (error); 1273 error = vn_stat(vp, &sb, p); 1274 vput(vp); 1275 if (error) 1276 return (error); 1277 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1278 return (error); 1279 } 1280 1281 /* ARGSUSED */ 1282 int 1283 sys_fhstatfs(p, v, retval) 1284 struct proc *p; 1285 void *v; 1286 register_t *retval; 1287 { 1288 struct sys_fhstatfs_args /* 1289 syscallarg(const fhandle_t *) fhp; 1290 syscallarg(struct statfs *) buf; 1291 } */ *uap = v; 1292 struct statfs sp; 1293 fhandle_t fh; 1294 struct mount *mp; 1295 struct vnode *vp; 1296 int error; 1297 1298 /* 1299 * Must be super user 1300 */ 1301 if ((error = suser(p->p_ucred, &p->p_acflag))) 1302 return (error); 1303 1304 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1305 return (error); 1306 1307 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1308 return (ESTALE); 1309 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1310 return (error); 1311 mp = vp->v_mount; 1312 vput(vp); 1313 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1314 return (error); 1315 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1316 sp.f_oflags = sp.f_flags & 0xffff; 1317 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1318 } 1319 1320 /* 1321 * Create a special file. 1322 */ 1323 /* ARGSUSED */ 1324 int 1325 sys_mknod(p, v, retval) 1326 struct proc *p; 1327 void *v; 1328 register_t *retval; 1329 { 1330 struct sys_mknod_args /* { 1331 syscallarg(const char *) path; 1332 syscallarg(int) mode; 1333 syscallarg(int) dev; 1334 } */ *uap = v; 1335 struct vnode *vp; 1336 struct vattr vattr; 1337 int error; 1338 int whiteout = 0; 1339 struct nameidata nd; 1340 1341 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1342 return (error); 1343 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1344 if ((error = namei(&nd)) != 0) 1345 return (error); 1346 vp = nd.ni_vp; 1347 if (vp != NULL) 1348 error = EEXIST; 1349 else { 1350 VATTR_NULL(&vattr); 1351 vattr.va_mode = 1352 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1353 vattr.va_rdev = SCARG(uap, dev); 1354 whiteout = 0; 1355 1356 switch (SCARG(uap, mode) & S_IFMT) { 1357 case S_IFMT: /* used by badsect to flag bad sectors */ 1358 vattr.va_type = VBAD; 1359 break; 1360 case S_IFCHR: 1361 vattr.va_type = VCHR; 1362 break; 1363 case S_IFBLK: 1364 vattr.va_type = VBLK; 1365 break; 1366 case S_IFWHT: 1367 whiteout = 1; 1368 break; 1369 default: 1370 error = EINVAL; 1371 break; 1372 } 1373 } 1374 if (!error) { 1375 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1376 if (whiteout) { 1377 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1378 if (error) 1379 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1380 vput(nd.ni_dvp); 1381 } else { 1382 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1383 &nd.ni_cnd, &vattr); 1384 if (error == 0) 1385 vput(nd.ni_vp); 1386 } 1387 } else { 1388 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1389 if (nd.ni_dvp == vp) 1390 vrele(nd.ni_dvp); 1391 else 1392 vput(nd.ni_dvp); 1393 if (vp) 1394 vrele(vp); 1395 } 1396 return (error); 1397 } 1398 1399 /* 1400 * Create a named pipe. 1401 */ 1402 /* ARGSUSED */ 1403 int 1404 sys_mkfifo(p, v, retval) 1405 struct proc *p; 1406 void *v; 1407 register_t *retval; 1408 { 1409 struct sys_mkfifo_args /* { 1410 syscallarg(const char *) path; 1411 syscallarg(int) mode; 1412 } */ *uap = v; 1413 struct vattr vattr; 1414 int error; 1415 struct nameidata nd; 1416 1417 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1418 if ((error = namei(&nd)) != 0) 1419 return (error); 1420 if (nd.ni_vp != NULL) { 1421 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1422 if (nd.ni_dvp == nd.ni_vp) 1423 vrele(nd.ni_dvp); 1424 else 1425 vput(nd.ni_dvp); 1426 vrele(nd.ni_vp); 1427 return (EEXIST); 1428 } 1429 VATTR_NULL(&vattr); 1430 vattr.va_type = VFIFO; 1431 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1432 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1433 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1434 if (error == 0) 1435 vput(nd.ni_vp); 1436 return (error); 1437 } 1438 1439 /* 1440 * Make a hard file link. 1441 */ 1442 /* ARGSUSED */ 1443 int 1444 sys_link(p, v, retval) 1445 struct proc *p; 1446 void *v; 1447 register_t *retval; 1448 { 1449 struct sys_link_args /* { 1450 syscallarg(const char *) path; 1451 syscallarg(const char *) link; 1452 } */ *uap = v; 1453 struct vnode *vp; 1454 struct nameidata nd; 1455 int error; 1456 1457 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1458 if ((error = namei(&nd)) != 0) 1459 return (error); 1460 vp = nd.ni_vp; 1461 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1462 if ((error = namei(&nd)) != 0) 1463 goto out; 1464 if (nd.ni_vp) { 1465 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1466 if (nd.ni_dvp == nd.ni_vp) 1467 vrele(nd.ni_dvp); 1468 else 1469 vput(nd.ni_dvp); 1470 vrele(nd.ni_vp); 1471 error = EEXIST; 1472 goto out; 1473 } 1474 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1475 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1476 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1477 out: 1478 vrele(vp); 1479 return (error); 1480 } 1481 1482 /* 1483 * Make a symbolic link. 1484 */ 1485 /* ARGSUSED */ 1486 int 1487 sys_symlink(p, v, retval) 1488 struct proc *p; 1489 void *v; 1490 register_t *retval; 1491 { 1492 struct sys_symlink_args /* { 1493 syscallarg(const char *) path; 1494 syscallarg(const char *) link; 1495 } */ *uap = v; 1496 struct vattr vattr; 1497 char *path; 1498 int error; 1499 struct nameidata nd; 1500 1501 path = PNBUF_GET(); 1502 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1503 if (error) 1504 goto out; 1505 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1506 if ((error = namei(&nd)) != 0) 1507 goto out; 1508 if (nd.ni_vp) { 1509 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1510 if (nd.ni_dvp == nd.ni_vp) 1511 vrele(nd.ni_dvp); 1512 else 1513 vput(nd.ni_dvp); 1514 vrele(nd.ni_vp); 1515 error = EEXIST; 1516 goto out; 1517 } 1518 VATTR_NULL(&vattr); 1519 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1520 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1521 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1522 if (error == 0) 1523 vput(nd.ni_vp); 1524 out: 1525 PNBUF_PUT(path); 1526 return (error); 1527 } 1528 1529 /* 1530 * Delete a whiteout from the filesystem. 1531 */ 1532 /* ARGSUSED */ 1533 int 1534 sys_undelete(p, v, retval) 1535 struct proc *p; 1536 void *v; 1537 register_t *retval; 1538 { 1539 struct sys_undelete_args /* { 1540 syscallarg(const char *) path; 1541 } */ *uap = v; 1542 int error; 1543 struct nameidata nd; 1544 1545 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1546 SCARG(uap, path), p); 1547 error = namei(&nd); 1548 if (error) 1549 return (error); 1550 1551 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1552 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1553 if (nd.ni_dvp == nd.ni_vp) 1554 vrele(nd.ni_dvp); 1555 else 1556 vput(nd.ni_dvp); 1557 if (nd.ni_vp) 1558 vrele(nd.ni_vp); 1559 return (EEXIST); 1560 } 1561 1562 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1563 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1564 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1565 vput(nd.ni_dvp); 1566 return (error); 1567 } 1568 1569 /* 1570 * Delete a name from the filesystem. 1571 */ 1572 /* ARGSUSED */ 1573 int 1574 sys_unlink(p, v, retval) 1575 struct proc *p; 1576 void *v; 1577 register_t *retval; 1578 { 1579 struct sys_unlink_args /* { 1580 syscallarg(const char *) path; 1581 } */ *uap = v; 1582 struct vnode *vp; 1583 int error; 1584 struct nameidata nd; 1585 1586 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1587 SCARG(uap, path), p); 1588 if ((error = namei(&nd)) != 0) 1589 return (error); 1590 vp = nd.ni_vp; 1591 1592 /* 1593 * The root of a mounted filesystem cannot be deleted. 1594 */ 1595 if (vp->v_flag & VROOT) { 1596 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1597 if (nd.ni_dvp == vp) 1598 vrele(nd.ni_dvp); 1599 else 1600 vput(nd.ni_dvp); 1601 vput(vp); 1602 error = EBUSY; 1603 goto out; 1604 } 1605 1606 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1607 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1608 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1609 out: 1610 return (error); 1611 } 1612 1613 /* 1614 * Reposition read/write file offset. 1615 */ 1616 int 1617 sys_lseek(p, v, retval) 1618 struct proc *p; 1619 void *v; 1620 register_t *retval; 1621 { 1622 struct sys_lseek_args /* { 1623 syscallarg(int) fd; 1624 syscallarg(int) pad; 1625 syscallarg(off_t) offset; 1626 syscallarg(int) whence; 1627 } */ *uap = v; 1628 struct ucred *cred = p->p_ucred; 1629 struct filedesc *fdp = p->p_fd; 1630 struct file *fp; 1631 struct vnode *vp; 1632 struct vattr vattr; 1633 off_t newoff; 1634 int error; 1635 1636 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1637 return (EBADF); 1638 1639 FILE_USE(fp); 1640 1641 vp = (struct vnode *)fp->f_data; 1642 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1643 error = ESPIPE; 1644 goto out; 1645 } 1646 1647 switch (SCARG(uap, whence)) { 1648 case SEEK_CUR: 1649 newoff = fp->f_offset + SCARG(uap, offset); 1650 break; 1651 case SEEK_END: 1652 error = VOP_GETATTR(vp, &vattr, cred, p); 1653 if (error) 1654 goto out; 1655 newoff = SCARG(uap, offset) + vattr.va_size; 1656 break; 1657 case SEEK_SET: 1658 newoff = SCARG(uap, offset); 1659 break; 1660 default: 1661 error = EINVAL; 1662 goto out; 1663 } 1664 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1665 goto out; 1666 1667 *(off_t *)retval = fp->f_offset = newoff; 1668 out: 1669 FILE_UNUSE(fp, p); 1670 return (error); 1671 } 1672 1673 /* 1674 * Positional read system call. 1675 */ 1676 int 1677 sys_pread(p, v, retval) 1678 struct proc *p; 1679 void *v; 1680 register_t *retval; 1681 { 1682 struct sys_pread_args /* { 1683 syscallarg(int) fd; 1684 syscallarg(void *) buf; 1685 syscallarg(size_t) nbyte; 1686 syscallarg(off_t) offset; 1687 } */ *uap = v; 1688 struct filedesc *fdp = p->p_fd; 1689 struct file *fp; 1690 struct vnode *vp; 1691 off_t offset; 1692 int error, fd = SCARG(uap, fd); 1693 1694 if ((fp = fd_getfile(fdp, fd)) == NULL) 1695 return (EBADF); 1696 1697 if ((fp->f_flag & FREAD) == 0) 1698 return (EBADF); 1699 1700 FILE_USE(fp); 1701 1702 vp = (struct vnode *)fp->f_data; 1703 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1704 error = ESPIPE; 1705 goto out; 1706 } 1707 1708 offset = SCARG(uap, offset); 1709 1710 /* 1711 * XXX This works because no file systems actually 1712 * XXX take any action on the seek operation. 1713 */ 1714 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1715 goto out; 1716 1717 /* dofileread() will unuse the descriptor for us */ 1718 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1719 &offset, 0, retval)); 1720 1721 out: 1722 FILE_UNUSE(fp, p); 1723 return (error); 1724 } 1725 1726 /* 1727 * Positional scatter read system call. 1728 */ 1729 int 1730 sys_preadv(p, v, retval) 1731 struct proc *p; 1732 void *v; 1733 register_t *retval; 1734 { 1735 struct sys_preadv_args /* { 1736 syscallarg(int) fd; 1737 syscallarg(const struct iovec *) iovp; 1738 syscallarg(int) iovcnt; 1739 syscallarg(off_t) offset; 1740 } */ *uap = v; 1741 struct filedesc *fdp = p->p_fd; 1742 struct file *fp; 1743 struct vnode *vp; 1744 off_t offset; 1745 int error, fd = SCARG(uap, fd); 1746 1747 if ((fp = fd_getfile(fdp, fd)) == NULL) 1748 return (EBADF); 1749 1750 if ((fp->f_flag & FREAD) == 0) 1751 return (EBADF); 1752 1753 FILE_USE(fp); 1754 1755 vp = (struct vnode *)fp->f_data; 1756 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1757 error = ESPIPE; 1758 goto out; 1759 } 1760 1761 offset = SCARG(uap, offset); 1762 1763 /* 1764 * XXX This works because no file systems actually 1765 * XXX take any action on the seek operation. 1766 */ 1767 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1768 goto out; 1769 1770 /* dofilereadv() will unuse the descriptor for us */ 1771 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1772 &offset, 0, retval)); 1773 1774 out: 1775 FILE_UNUSE(fp, p); 1776 return (error); 1777 } 1778 1779 /* 1780 * Positional write system call. 1781 */ 1782 int 1783 sys_pwrite(p, v, retval) 1784 struct proc *p; 1785 void *v; 1786 register_t *retval; 1787 { 1788 struct sys_pwrite_args /* { 1789 syscallarg(int) fd; 1790 syscallarg(const void *) buf; 1791 syscallarg(size_t) nbyte; 1792 syscallarg(off_t) offset; 1793 } */ *uap = v; 1794 struct filedesc *fdp = p->p_fd; 1795 struct file *fp; 1796 struct vnode *vp; 1797 off_t offset; 1798 int error, fd = SCARG(uap, fd); 1799 1800 if ((fp = fd_getfile(fdp, fd)) == NULL) 1801 return (EBADF); 1802 1803 if ((fp->f_flag & FWRITE) == 0) 1804 return (EBADF); 1805 1806 FILE_USE(fp); 1807 1808 vp = (struct vnode *)fp->f_data; 1809 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1810 error = ESPIPE; 1811 goto out; 1812 } 1813 1814 offset = SCARG(uap, offset); 1815 1816 /* 1817 * XXX This works because no file systems actually 1818 * XXX take any action on the seek operation. 1819 */ 1820 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1821 goto out; 1822 1823 /* dofilewrite() will unuse the descriptor for us */ 1824 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1825 &offset, 0, retval)); 1826 1827 out: 1828 FILE_UNUSE(fp, p); 1829 return (error); 1830 } 1831 1832 /* 1833 * Positional gather write system call. 1834 */ 1835 int 1836 sys_pwritev(p, v, retval) 1837 struct proc *p; 1838 void *v; 1839 register_t *retval; 1840 { 1841 struct sys_pwritev_args /* { 1842 syscallarg(int) fd; 1843 syscallarg(const struct iovec *) iovp; 1844 syscallarg(int) iovcnt; 1845 syscallarg(off_t) offset; 1846 } */ *uap = v; 1847 struct filedesc *fdp = p->p_fd; 1848 struct file *fp; 1849 struct vnode *vp; 1850 off_t offset; 1851 int error, fd = SCARG(uap, fd); 1852 1853 if ((fp = fd_getfile(fdp, fd)) == NULL) 1854 return (EBADF); 1855 1856 if ((fp->f_flag & FWRITE) == 0) 1857 return (EBADF); 1858 1859 FILE_USE(fp); 1860 1861 vp = (struct vnode *)fp->f_data; 1862 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1863 error = ESPIPE; 1864 goto out; 1865 } 1866 1867 offset = SCARG(uap, offset); 1868 1869 /* 1870 * XXX This works because no file systems actually 1871 * XXX take any action on the seek operation. 1872 */ 1873 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1874 goto out; 1875 1876 /* dofilewritev() will unuse the descriptor for us */ 1877 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1878 &offset, 0, retval)); 1879 1880 out: 1881 FILE_UNUSE(fp, p); 1882 return (error); 1883 } 1884 1885 /* 1886 * Check access permissions. 1887 */ 1888 int 1889 sys_access(p, v, retval) 1890 struct proc *p; 1891 void *v; 1892 register_t *retval; 1893 { 1894 struct sys_access_args /* { 1895 syscallarg(const char *) path; 1896 syscallarg(int) flags; 1897 } */ *uap = v; 1898 struct ucred *cred = crget(); 1899 struct vnode *vp; 1900 int error, flags; 1901 struct nameidata nd; 1902 1903 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 1904 cred->cr_ref = 1; 1905 cred->cr_uid = p->p_cred->p_ruid; 1906 cred->cr_gid = p->p_cred->p_rgid; 1907 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1908 SCARG(uap, path), p); 1909 /* Override default credentials */ 1910 nd.ni_cnd.cn_cred = cred; 1911 if ((error = namei(&nd)) != 0) 1912 goto out; 1913 vp = nd.ni_vp; 1914 1915 /* Flags == 0 means only check for existence. */ 1916 if (SCARG(uap, flags)) { 1917 flags = 0; 1918 if (SCARG(uap, flags) & R_OK) 1919 flags |= VREAD; 1920 if (SCARG(uap, flags) & W_OK) 1921 flags |= VWRITE; 1922 if (SCARG(uap, flags) & X_OK) 1923 flags |= VEXEC; 1924 1925 error = VOP_ACCESS(vp, flags, cred, p); 1926 if (!error && (flags & VWRITE)) 1927 error = vn_writechk(vp); 1928 } 1929 vput(vp); 1930 out: 1931 crfree(cred); 1932 return (error); 1933 } 1934 1935 /* 1936 * Get file status; this version follows links. 1937 */ 1938 /* ARGSUSED */ 1939 int 1940 sys___stat13(p, v, retval) 1941 struct proc *p; 1942 void *v; 1943 register_t *retval; 1944 { 1945 struct sys___stat13_args /* { 1946 syscallarg(const char *) path; 1947 syscallarg(struct stat *) ub; 1948 } */ *uap = v; 1949 struct stat sb; 1950 int error; 1951 struct nameidata nd; 1952 1953 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1954 SCARG(uap, path), p); 1955 if ((error = namei(&nd)) != 0) 1956 return (error); 1957 error = vn_stat(nd.ni_vp, &sb, p); 1958 vput(nd.ni_vp); 1959 if (error) 1960 return (error); 1961 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1962 return (error); 1963 } 1964 1965 /* 1966 * Get file status; this version does not follow links. 1967 */ 1968 /* ARGSUSED */ 1969 int 1970 sys___lstat13(p, v, retval) 1971 struct proc *p; 1972 void *v; 1973 register_t *retval; 1974 { 1975 struct sys___lstat13_args /* { 1976 syscallarg(const char *) path; 1977 syscallarg(struct stat *) ub; 1978 } */ *uap = v; 1979 struct stat sb; 1980 int error; 1981 struct nameidata nd; 1982 1983 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1984 SCARG(uap, path), p); 1985 if ((error = namei(&nd)) != 0) 1986 return (error); 1987 error = vn_stat(nd.ni_vp, &sb, p); 1988 vput(nd.ni_vp); 1989 if (error) 1990 return (error); 1991 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1992 return (error); 1993 } 1994 1995 /* 1996 * Get configurable pathname variables. 1997 */ 1998 /* ARGSUSED */ 1999 int 2000 sys_pathconf(p, v, retval) 2001 struct proc *p; 2002 void *v; 2003 register_t *retval; 2004 { 2005 struct sys_pathconf_args /* { 2006 syscallarg(const char *) path; 2007 syscallarg(int) name; 2008 } */ *uap = v; 2009 int error; 2010 struct nameidata nd; 2011 2012 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2013 SCARG(uap, path), p); 2014 if ((error = namei(&nd)) != 0) 2015 return (error); 2016 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2017 vput(nd.ni_vp); 2018 return (error); 2019 } 2020 2021 /* 2022 * Return target name of a symbolic link. 2023 */ 2024 /* ARGSUSED */ 2025 int 2026 sys_readlink(p, v, retval) 2027 struct proc *p; 2028 void *v; 2029 register_t *retval; 2030 { 2031 struct sys_readlink_args /* { 2032 syscallarg(const char *) path; 2033 syscallarg(char *) buf; 2034 syscallarg(size_t) count; 2035 } */ *uap = v; 2036 struct vnode *vp; 2037 struct iovec aiov; 2038 struct uio auio; 2039 int error; 2040 struct nameidata nd; 2041 2042 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2043 SCARG(uap, path), p); 2044 if ((error = namei(&nd)) != 0) 2045 return (error); 2046 vp = nd.ni_vp; 2047 if (vp->v_type != VLNK) 2048 error = EINVAL; 2049 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2050 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2051 aiov.iov_base = SCARG(uap, buf); 2052 aiov.iov_len = SCARG(uap, count); 2053 auio.uio_iov = &aiov; 2054 auio.uio_iovcnt = 1; 2055 auio.uio_offset = 0; 2056 auio.uio_rw = UIO_READ; 2057 auio.uio_segflg = UIO_USERSPACE; 2058 auio.uio_procp = p; 2059 auio.uio_resid = SCARG(uap, count); 2060 error = VOP_READLINK(vp, &auio, p->p_ucred); 2061 } 2062 vput(vp); 2063 *retval = SCARG(uap, count) - auio.uio_resid; 2064 return (error); 2065 } 2066 2067 /* 2068 * Change flags of a file given a path name. 2069 */ 2070 /* ARGSUSED */ 2071 int 2072 sys_chflags(p, v, retval) 2073 struct proc *p; 2074 void *v; 2075 register_t *retval; 2076 { 2077 struct sys_chflags_args /* { 2078 syscallarg(const char *) path; 2079 syscallarg(u_long) flags; 2080 } */ *uap = v; 2081 struct vnode *vp; 2082 int error; 2083 struct nameidata nd; 2084 2085 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2086 if ((error = namei(&nd)) != 0) 2087 return (error); 2088 vp = nd.ni_vp; 2089 error = change_flags(vp, SCARG(uap, flags), p); 2090 vput(vp); 2091 return (error); 2092 } 2093 2094 /* 2095 * Change flags of a file given a file descriptor. 2096 */ 2097 /* ARGSUSED */ 2098 int 2099 sys_fchflags(p, v, retval) 2100 struct proc *p; 2101 void *v; 2102 register_t *retval; 2103 { 2104 struct sys_fchflags_args /* { 2105 syscallarg(int) fd; 2106 syscallarg(u_long) flags; 2107 } */ *uap = v; 2108 struct vnode *vp; 2109 struct file *fp; 2110 int error; 2111 2112 /* getvnode() will use the descriptor for us */ 2113 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2114 return (error); 2115 vp = (struct vnode *)fp->f_data; 2116 error = change_flags(vp, SCARG(uap, flags), p); 2117 VOP_UNLOCK(vp, 0); 2118 FILE_UNUSE(fp, p); 2119 return (error); 2120 } 2121 2122 /* 2123 * Change flags of a file given a path name; this version does 2124 * not follow links. 2125 */ 2126 int 2127 sys_lchflags(p, v, retval) 2128 struct proc *p; 2129 void *v; 2130 register_t *retval; 2131 { 2132 struct sys_lchflags_args /* { 2133 syscallarg(const char *) path; 2134 syscallarg(u_long) flags; 2135 } */ *uap = v; 2136 struct vnode *vp; 2137 int error; 2138 struct nameidata nd; 2139 2140 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2141 if ((error = namei(&nd)) != 0) 2142 return (error); 2143 vp = nd.ni_vp; 2144 error = change_flags(vp, SCARG(uap, flags), p); 2145 vput(vp); 2146 return (error); 2147 } 2148 2149 /* 2150 * Common routine to change flags of a file. 2151 */ 2152 int 2153 change_flags(vp, flags, p) 2154 struct vnode *vp; 2155 u_long flags; 2156 struct proc *p; 2157 { 2158 struct vattr vattr; 2159 int error; 2160 2161 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2162 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2163 /* 2164 * Non-superusers cannot change the flags on devices, even if they 2165 * own them. 2166 */ 2167 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2168 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2169 goto out; 2170 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2171 error = EINVAL; 2172 goto out; 2173 } 2174 } 2175 VATTR_NULL(&vattr); 2176 vattr.va_flags = flags; 2177 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2178 out: 2179 return (error); 2180 } 2181 2182 /* 2183 * Change mode of a file given path name; this version follows links. 2184 */ 2185 /* ARGSUSED */ 2186 int 2187 sys_chmod(p, v, retval) 2188 struct proc *p; 2189 void *v; 2190 register_t *retval; 2191 { 2192 struct sys_chmod_args /* { 2193 syscallarg(const char *) path; 2194 syscallarg(int) mode; 2195 } */ *uap = v; 2196 int error; 2197 struct nameidata nd; 2198 2199 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2200 if ((error = namei(&nd)) != 0) 2201 return (error); 2202 2203 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2204 2205 vrele(nd.ni_vp); 2206 return (error); 2207 } 2208 2209 /* 2210 * Change mode of a file given a file descriptor. 2211 */ 2212 /* ARGSUSED */ 2213 int 2214 sys_fchmod(p, v, retval) 2215 struct proc *p; 2216 void *v; 2217 register_t *retval; 2218 { 2219 struct sys_fchmod_args /* { 2220 syscallarg(int) fd; 2221 syscallarg(int) mode; 2222 } */ *uap = v; 2223 struct file *fp; 2224 int error; 2225 2226 /* getvnode() will use the descriptor for us */ 2227 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2228 return (error); 2229 2230 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2231 FILE_UNUSE(fp, p); 2232 return (error); 2233 } 2234 2235 /* 2236 * Change mode of a file given path name; this version does not follow links. 2237 */ 2238 /* ARGSUSED */ 2239 int 2240 sys_lchmod(p, v, retval) 2241 struct proc *p; 2242 void *v; 2243 register_t *retval; 2244 { 2245 struct sys_lchmod_args /* { 2246 syscallarg(const char *) path; 2247 syscallarg(int) mode; 2248 } */ *uap = v; 2249 int error; 2250 struct nameidata nd; 2251 2252 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2253 if ((error = namei(&nd)) != 0) 2254 return (error); 2255 2256 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2257 2258 vrele(nd.ni_vp); 2259 return (error); 2260 } 2261 2262 /* 2263 * Common routine to set mode given a vnode. 2264 */ 2265 static int 2266 change_mode(vp, mode, p) 2267 struct vnode *vp; 2268 int mode; 2269 struct proc *p; 2270 { 2271 struct vattr vattr; 2272 int error; 2273 2274 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2275 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2276 VATTR_NULL(&vattr); 2277 vattr.va_mode = mode & ALLPERMS; 2278 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2279 VOP_UNLOCK(vp, 0); 2280 return (error); 2281 } 2282 2283 /* 2284 * Set ownership given a path name; this version follows links. 2285 */ 2286 /* ARGSUSED */ 2287 int 2288 sys_chown(p, v, retval) 2289 struct proc *p; 2290 void *v; 2291 register_t *retval; 2292 { 2293 struct sys_chown_args /* { 2294 syscallarg(const char *) path; 2295 syscallarg(uid_t) uid; 2296 syscallarg(gid_t) gid; 2297 } */ *uap = v; 2298 int error; 2299 struct nameidata nd; 2300 2301 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2302 if ((error = namei(&nd)) != 0) 2303 return (error); 2304 2305 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2306 2307 vrele(nd.ni_vp); 2308 return (error); 2309 } 2310 2311 /* 2312 * Set ownership given a path name; this version follows links. 2313 * Provides POSIX semantics. 2314 */ 2315 /* ARGSUSED */ 2316 int 2317 sys___posix_chown(p, v, retval) 2318 struct proc *p; 2319 void *v; 2320 register_t *retval; 2321 { 2322 struct sys_chown_args /* { 2323 syscallarg(const char *) path; 2324 syscallarg(uid_t) uid; 2325 syscallarg(gid_t) gid; 2326 } */ *uap = v; 2327 int error; 2328 struct nameidata nd; 2329 2330 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2331 if ((error = namei(&nd)) != 0) 2332 return (error); 2333 2334 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2335 2336 vrele(nd.ni_vp); 2337 return (error); 2338 } 2339 2340 /* 2341 * Set ownership given a file descriptor. 2342 */ 2343 /* ARGSUSED */ 2344 int 2345 sys_fchown(p, v, retval) 2346 struct proc *p; 2347 void *v; 2348 register_t *retval; 2349 { 2350 struct sys_fchown_args /* { 2351 syscallarg(int) fd; 2352 syscallarg(uid_t) uid; 2353 syscallarg(gid_t) gid; 2354 } */ *uap = v; 2355 int error; 2356 struct file *fp; 2357 2358 /* getvnode() will use the descriptor for us */ 2359 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2360 return (error); 2361 2362 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2363 SCARG(uap, gid), p, 0); 2364 FILE_UNUSE(fp, p); 2365 return (error); 2366 } 2367 2368 /* 2369 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2370 */ 2371 /* ARGSUSED */ 2372 int 2373 sys___posix_fchown(p, v, retval) 2374 struct proc *p; 2375 void *v; 2376 register_t *retval; 2377 { 2378 struct sys_fchown_args /* { 2379 syscallarg(int) fd; 2380 syscallarg(uid_t) uid; 2381 syscallarg(gid_t) gid; 2382 } */ *uap = v; 2383 int error; 2384 struct file *fp; 2385 2386 /* getvnode() will use the descriptor for us */ 2387 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2388 return (error); 2389 2390 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2391 SCARG(uap, gid), p, 1); 2392 FILE_UNUSE(fp, p); 2393 return (error); 2394 } 2395 2396 /* 2397 * Set ownership given a path name; this version does not follow links. 2398 */ 2399 /* ARGSUSED */ 2400 int 2401 sys_lchown(p, v, retval) 2402 struct proc *p; 2403 void *v; 2404 register_t *retval; 2405 { 2406 struct sys_lchown_args /* { 2407 syscallarg(const char *) path; 2408 syscallarg(uid_t) uid; 2409 syscallarg(gid_t) gid; 2410 } */ *uap = v; 2411 int error; 2412 struct nameidata nd; 2413 2414 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2415 if ((error = namei(&nd)) != 0) 2416 return (error); 2417 2418 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2419 2420 vrele(nd.ni_vp); 2421 return (error); 2422 } 2423 2424 /* 2425 * Set ownership given a path name; this version does not follow links. 2426 * Provides POSIX/XPG semantics. 2427 */ 2428 /* ARGSUSED */ 2429 int 2430 sys___posix_lchown(p, v, retval) 2431 struct proc *p; 2432 void *v; 2433 register_t *retval; 2434 { 2435 struct sys_lchown_args /* { 2436 syscallarg(const char *) path; 2437 syscallarg(uid_t) uid; 2438 syscallarg(gid_t) gid; 2439 } */ *uap = v; 2440 int error; 2441 struct nameidata nd; 2442 2443 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2444 if ((error = namei(&nd)) != 0) 2445 return (error); 2446 2447 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2448 2449 vrele(nd.ni_vp); 2450 return (error); 2451 } 2452 2453 /* 2454 * Common routine to set ownership given a vnode. 2455 */ 2456 static int 2457 change_owner(vp, uid, gid, p, posix_semantics) 2458 struct vnode *vp; 2459 uid_t uid; 2460 gid_t gid; 2461 struct proc *p; 2462 int posix_semantics; 2463 { 2464 struct vattr vattr; 2465 mode_t newmode; 2466 int error; 2467 2468 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2469 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2470 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2471 goto out; 2472 2473 #define CHANGED(x) ((x) != -1) 2474 newmode = vattr.va_mode; 2475 if (posix_semantics) { 2476 /* 2477 * POSIX/XPG semantics: if the caller is not the super-user, 2478 * clear set-user-id and set-group-id bits. Both POSIX and 2479 * the XPG consider the behaviour for calls by the super-user 2480 * implementation-defined; we leave the set-user-id and set- 2481 * group-id settings intact in that case. 2482 */ 2483 if (suser(p->p_ucred, NULL) != 0) 2484 newmode &= ~(S_ISUID | S_ISGID); 2485 } else { 2486 /* 2487 * NetBSD semantics: when changing owner and/or group, 2488 * clear the respective bit(s). 2489 */ 2490 if (CHANGED(uid)) 2491 newmode &= ~S_ISUID; 2492 if (CHANGED(gid)) 2493 newmode &= ~S_ISGID; 2494 } 2495 /* Update va_mode iff altered. */ 2496 if (vattr.va_mode == newmode) 2497 newmode = VNOVAL; 2498 2499 VATTR_NULL(&vattr); 2500 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2501 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2502 vattr.va_mode = newmode; 2503 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2504 #undef CHANGED 2505 2506 out: 2507 VOP_UNLOCK(vp, 0); 2508 return (error); 2509 } 2510 2511 /* 2512 * Set the access and modification times given a path name; this 2513 * version follows links. 2514 */ 2515 /* ARGSUSED */ 2516 int 2517 sys_utimes(p, v, retval) 2518 struct proc *p; 2519 void *v; 2520 register_t *retval; 2521 { 2522 struct sys_utimes_args /* { 2523 syscallarg(const char *) path; 2524 syscallarg(const struct timeval *) tptr; 2525 } */ *uap = v; 2526 int error; 2527 struct nameidata nd; 2528 2529 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2530 if ((error = namei(&nd)) != 0) 2531 return (error); 2532 2533 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2534 2535 vrele(nd.ni_vp); 2536 return (error); 2537 } 2538 2539 /* 2540 * Set the access and modification times given a file descriptor. 2541 */ 2542 /* ARGSUSED */ 2543 int 2544 sys_futimes(p, v, retval) 2545 struct proc *p; 2546 void *v; 2547 register_t *retval; 2548 { 2549 struct sys_futimes_args /* { 2550 syscallarg(int) fd; 2551 syscallarg(const struct timeval *) tptr; 2552 } */ *uap = v; 2553 int error; 2554 struct file *fp; 2555 2556 /* getvnode() will use the descriptor for us */ 2557 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2558 return (error); 2559 2560 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2561 FILE_UNUSE(fp, p); 2562 return (error); 2563 } 2564 2565 /* 2566 * Set the access and modification times given a path name; this 2567 * version does not follow links. 2568 */ 2569 /* ARGSUSED */ 2570 int 2571 sys_lutimes(p, v, retval) 2572 struct proc *p; 2573 void *v; 2574 register_t *retval; 2575 { 2576 struct sys_lutimes_args /* { 2577 syscallarg(const char *) path; 2578 syscallarg(const struct timeval *) tptr; 2579 } */ *uap = v; 2580 int error; 2581 struct nameidata nd; 2582 2583 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2584 if ((error = namei(&nd)) != 0) 2585 return (error); 2586 2587 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2588 2589 vrele(nd.ni_vp); 2590 return (error); 2591 } 2592 2593 /* 2594 * Common routine to set access and modification times given a vnode. 2595 */ 2596 static int 2597 change_utimes(vp, tptr, p) 2598 struct vnode *vp; 2599 const struct timeval *tptr; 2600 struct proc *p; 2601 { 2602 struct timeval tv[2]; 2603 struct vattr vattr; 2604 int error; 2605 2606 VATTR_NULL(&vattr); 2607 if (tptr == NULL) { 2608 microtime(&tv[0]); 2609 tv[1] = tv[0]; 2610 vattr.va_vaflags |= VA_UTIMES_NULL; 2611 } else { 2612 error = copyin(tptr, tv, sizeof(tv)); 2613 if (error) 2614 return (error); 2615 } 2616 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2617 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2618 vattr.va_atime.tv_sec = tv[0].tv_sec; 2619 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2620 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2621 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2622 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2623 VOP_UNLOCK(vp, 0); 2624 return (error); 2625 } 2626 2627 /* 2628 * Truncate a file given its path name. 2629 */ 2630 /* ARGSUSED */ 2631 int 2632 sys_truncate(p, v, retval) 2633 struct proc *p; 2634 void *v; 2635 register_t *retval; 2636 { 2637 struct sys_truncate_args /* { 2638 syscallarg(const char *) path; 2639 syscallarg(int) pad; 2640 syscallarg(off_t) length; 2641 } */ *uap = v; 2642 struct vnode *vp; 2643 struct vattr vattr; 2644 int error; 2645 struct nameidata nd; 2646 2647 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2648 if ((error = namei(&nd)) != 0) 2649 return (error); 2650 vp = nd.ni_vp; 2651 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2652 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2653 if (vp->v_type == VDIR) 2654 error = EISDIR; 2655 else if ((error = vn_writechk(vp)) == 0 && 2656 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2657 VATTR_NULL(&vattr); 2658 vattr.va_size = SCARG(uap, length); 2659 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2660 } 2661 vput(vp); 2662 return (error); 2663 } 2664 2665 /* 2666 * Truncate a file given a file descriptor. 2667 */ 2668 /* ARGSUSED */ 2669 int 2670 sys_ftruncate(p, v, retval) 2671 struct proc *p; 2672 void *v; 2673 register_t *retval; 2674 { 2675 struct sys_ftruncate_args /* { 2676 syscallarg(int) fd; 2677 syscallarg(int) pad; 2678 syscallarg(off_t) length; 2679 } */ *uap = v; 2680 struct vattr vattr; 2681 struct vnode *vp; 2682 struct file *fp; 2683 int error; 2684 2685 /* getvnode() will use the descriptor for us */ 2686 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2687 return (error); 2688 if ((fp->f_flag & FWRITE) == 0) { 2689 error = EINVAL; 2690 goto out; 2691 } 2692 vp = (struct vnode *)fp->f_data; 2693 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2694 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2695 if (vp->v_type == VDIR) 2696 error = EISDIR; 2697 else if ((error = vn_writechk(vp)) == 0) { 2698 VATTR_NULL(&vattr); 2699 vattr.va_size = SCARG(uap, length); 2700 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2701 } 2702 VOP_UNLOCK(vp, 0); 2703 out: 2704 FILE_UNUSE(fp, p); 2705 return (error); 2706 } 2707 2708 /* 2709 * Sync an open file. 2710 */ 2711 /* ARGSUSED */ 2712 int 2713 sys_fsync(p, v, retval) 2714 struct proc *p; 2715 void *v; 2716 register_t *retval; 2717 { 2718 struct sys_fsync_args /* { 2719 syscallarg(int) fd; 2720 } */ *uap = v; 2721 struct vnode *vp; 2722 struct file *fp; 2723 int error; 2724 2725 /* getvnode() will use the descriptor for us */ 2726 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2727 return (error); 2728 vp = (struct vnode *)fp->f_data; 2729 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2730 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2731 if (error == 0 && bioops.io_fsync != NULL && 2732 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2733 (*bioops.io_fsync)(vp); 2734 VOP_UNLOCK(vp, 0); 2735 FILE_UNUSE(fp, p); 2736 return (error); 2737 } 2738 2739 /* 2740 * Sync the data of an open file. 2741 */ 2742 /* ARGSUSED */ 2743 int 2744 sys_fdatasync(p, v, retval) 2745 struct proc *p; 2746 void *v; 2747 register_t *retval; 2748 { 2749 struct sys_fdatasync_args /* { 2750 syscallarg(int) fd; 2751 } */ *uap = v; 2752 struct vnode *vp; 2753 struct file *fp; 2754 int error; 2755 2756 /* getvnode() will use the descriptor for us */ 2757 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2758 return (error); 2759 vp = (struct vnode *)fp->f_data; 2760 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2761 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2762 VOP_UNLOCK(vp, 0); 2763 FILE_UNUSE(fp, p); 2764 return (error); 2765 } 2766 2767 /* 2768 * Rename files, (standard) BSD semantics frontend. 2769 */ 2770 /* ARGSUSED */ 2771 int 2772 sys_rename(p, v, retval) 2773 struct proc *p; 2774 void *v; 2775 register_t *retval; 2776 { 2777 struct sys_rename_args /* { 2778 syscallarg(const char *) from; 2779 syscallarg(const char *) to; 2780 } */ *uap = v; 2781 2782 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2783 } 2784 2785 /* 2786 * Rename files, POSIX semantics frontend. 2787 */ 2788 /* ARGSUSED */ 2789 int 2790 sys___posix_rename(p, v, retval) 2791 struct proc *p; 2792 void *v; 2793 register_t *retval; 2794 { 2795 struct sys___posix_rename_args /* { 2796 syscallarg(const char *) from; 2797 syscallarg(const char *) to; 2798 } */ *uap = v; 2799 2800 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2801 } 2802 2803 /* 2804 * Rename files. Source and destination must either both be directories, 2805 * or both not be directories. If target is a directory, it must be empty. 2806 * If `from' and `to' refer to the same object, the value of the `retain' 2807 * argument is used to determine whether `from' will be 2808 * 2809 * (retain == 0) deleted unless `from' and `to' refer to the same 2810 * object in the file system's name space (BSD). 2811 * (retain == 1) always retained (POSIX). 2812 */ 2813 static int 2814 rename_files(from, to, p, retain) 2815 const char *from, *to; 2816 struct proc *p; 2817 int retain; 2818 { 2819 struct vnode *tvp, *fvp, *tdvp; 2820 struct nameidata fromnd, tond; 2821 int error; 2822 2823 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2824 from, p); 2825 if ((error = namei(&fromnd)) != 0) 2826 return (error); 2827 fvp = fromnd.ni_vp; 2828 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2829 UIO_USERSPACE, to, p); 2830 if ((error = namei(&tond)) != 0) { 2831 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2832 vrele(fromnd.ni_dvp); 2833 vrele(fvp); 2834 goto out1; 2835 } 2836 tdvp = tond.ni_dvp; 2837 tvp = tond.ni_vp; 2838 2839 if (tvp != NULL) { 2840 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2841 error = ENOTDIR; 2842 goto out; 2843 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2844 error = EISDIR; 2845 goto out; 2846 } 2847 } 2848 2849 if (fvp == tdvp) 2850 error = EINVAL; 2851 2852 /* 2853 * Source and destination refer to the same object. 2854 */ 2855 if (fvp == tvp) { 2856 if (retain) 2857 error = -1; 2858 else if (fromnd.ni_dvp == tdvp && 2859 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2860 !memcmp(fromnd.ni_cnd.cn_nameptr, 2861 tond.ni_cnd.cn_nameptr, 2862 fromnd.ni_cnd.cn_namelen)) 2863 error = -1; 2864 } 2865 2866 out: 2867 if (!error) { 2868 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2869 if (fromnd.ni_dvp != tdvp) 2870 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2871 if (tvp) { 2872 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2873 } 2874 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2875 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2876 } else { 2877 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2878 if (tdvp == tvp) 2879 vrele(tdvp); 2880 else 2881 vput(tdvp); 2882 if (tvp) 2883 vput(tvp); 2884 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2885 vrele(fromnd.ni_dvp); 2886 vrele(fvp); 2887 } 2888 vrele(tond.ni_startdir); 2889 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2890 out1: 2891 if (fromnd.ni_startdir) 2892 vrele(fromnd.ni_startdir); 2893 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2894 return (error == -1 ? 0 : error); 2895 } 2896 2897 /* 2898 * Make a directory file. 2899 */ 2900 /* ARGSUSED */ 2901 int 2902 sys_mkdir(p, v, retval) 2903 struct proc *p; 2904 void *v; 2905 register_t *retval; 2906 { 2907 struct sys_mkdir_args /* { 2908 syscallarg(const char *) path; 2909 syscallarg(int) mode; 2910 } */ *uap = v; 2911 struct vnode *vp; 2912 struct vattr vattr; 2913 int error; 2914 struct nameidata nd; 2915 2916 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2917 if ((error = namei(&nd)) != 0) 2918 return (error); 2919 vp = nd.ni_vp; 2920 if (vp != NULL) { 2921 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2922 if (nd.ni_dvp == vp) 2923 vrele(nd.ni_dvp); 2924 else 2925 vput(nd.ni_dvp); 2926 vrele(vp); 2927 return (EEXIST); 2928 } 2929 VATTR_NULL(&vattr); 2930 vattr.va_type = VDIR; 2931 vattr.va_mode = 2932 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2933 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2934 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2935 if (!error) 2936 vput(nd.ni_vp); 2937 return (error); 2938 } 2939 2940 /* 2941 * Remove a directory file. 2942 */ 2943 /* ARGSUSED */ 2944 int 2945 sys_rmdir(p, v, retval) 2946 struct proc *p; 2947 void *v; 2948 register_t *retval; 2949 { 2950 struct sys_rmdir_args /* { 2951 syscallarg(const char *) path; 2952 } */ *uap = v; 2953 struct vnode *vp; 2954 int error; 2955 struct nameidata nd; 2956 2957 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2958 SCARG(uap, path), p); 2959 if ((error = namei(&nd)) != 0) 2960 return (error); 2961 vp = nd.ni_vp; 2962 if (vp->v_type != VDIR) { 2963 error = ENOTDIR; 2964 goto out; 2965 } 2966 /* 2967 * No rmdir "." please. 2968 */ 2969 if (nd.ni_dvp == vp) { 2970 error = EINVAL; 2971 goto out; 2972 } 2973 /* 2974 * The root of a mounted filesystem cannot be deleted. 2975 */ 2976 if (vp->v_flag & VROOT) 2977 error = EBUSY; 2978 out: 2979 if (!error) { 2980 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2981 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2982 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2983 } else { 2984 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2985 if (nd.ni_dvp == vp) 2986 vrele(nd.ni_dvp); 2987 else 2988 vput(nd.ni_dvp); 2989 vput(vp); 2990 } 2991 return (error); 2992 } 2993 2994 /* 2995 * Read a block of directory entries in a file system independent format. 2996 */ 2997 int 2998 sys_getdents(p, v, retval) 2999 struct proc *p; 3000 void *v; 3001 register_t *retval; 3002 { 3003 struct sys_getdents_args /* { 3004 syscallarg(int) fd; 3005 syscallarg(char *) buf; 3006 syscallarg(size_t) count; 3007 } */ *uap = v; 3008 struct file *fp; 3009 int error, done; 3010 3011 /* getvnode() will use the descriptor for us */ 3012 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3013 return (error); 3014 if ((fp->f_flag & FREAD) == 0) { 3015 error = EBADF; 3016 goto out; 3017 } 3018 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3019 SCARG(uap, count), &done, p, 0, 0); 3020 *retval = done; 3021 out: 3022 FILE_UNUSE(fp, p); 3023 return (error); 3024 } 3025 3026 /* 3027 * Set the mode mask for creation of filesystem nodes. 3028 */ 3029 int 3030 sys_umask(p, v, retval) 3031 struct proc *p; 3032 void *v; 3033 register_t *retval; 3034 { 3035 struct sys_umask_args /* { 3036 syscallarg(mode_t) newmask; 3037 } */ *uap = v; 3038 struct cwdinfo *cwdi; 3039 3040 cwdi = p->p_cwdi; 3041 *retval = cwdi->cwdi_cmask; 3042 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3043 return (0); 3044 } 3045 3046 /* 3047 * Void all references to file by ripping underlying filesystem 3048 * away from vnode. 3049 */ 3050 /* ARGSUSED */ 3051 int 3052 sys_revoke(p, v, retval) 3053 struct proc *p; 3054 void *v; 3055 register_t *retval; 3056 { 3057 struct sys_revoke_args /* { 3058 syscallarg(const char *) path; 3059 } */ *uap = v; 3060 struct vnode *vp; 3061 struct vattr vattr; 3062 int error; 3063 struct nameidata nd; 3064 3065 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3066 if ((error = namei(&nd)) != 0) 3067 return (error); 3068 vp = nd.ni_vp; 3069 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3070 goto out; 3071 if (p->p_ucred->cr_uid != vattr.va_uid && 3072 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3073 goto out; 3074 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3075 VOP_REVOKE(vp, REVOKEALL); 3076 out: 3077 vrele(vp); 3078 return (error); 3079 } 3080 3081 /* 3082 * Convert a user file descriptor to a kernel file entry. 3083 */ 3084 int 3085 getvnode(fdp, fd, fpp) 3086 struct filedesc *fdp; 3087 int fd; 3088 struct file **fpp; 3089 { 3090 struct vnode *vp; 3091 struct file *fp; 3092 3093 if ((fp = fd_getfile(fdp, fd)) == NULL) 3094 return (EBADF); 3095 3096 FILE_USE(fp); 3097 3098 if (fp->f_type != DTYPE_VNODE) { 3099 FILE_UNUSE(fp, NULL); 3100 return (EINVAL); 3101 } 3102 3103 vp = (struct vnode *)fp->f_data; 3104 if (vp->v_type == VBAD) { 3105 FILE_UNUSE(fp, NULL); 3106 return (EBADF); 3107 } 3108 3109 *fpp = fp; 3110 return (0); 3111 } 3112
Indexes created Thu Sep 25 16:09:42 GMT 2025