vfs_syscalls.c revision 1.176
1 /* $NetBSD: vfs_syscalls.c,v 1.176 2002/09/04 01:32:50 matt 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 1.176 2002/09/04 01:32:50 matt 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 LIST_FOREACH(p, &allproc, p_list) { 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 (LIST_FIRST(&mp->mnt_vnodelist) != 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 = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 717 mp = nmp) { 718 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 719 nmp = CIRCLEQ_NEXT(mp, mnt_list); 720 continue; 721 } 722 if (sfsp && count < maxcount) { 723 sp = &mp->mnt_stat; 724 /* 725 * If MNT_NOWAIT or MNT_LAZY is specified, do not 726 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 727 * overrides MNT_NOWAIT. 728 */ 729 if (SCARG(uap, flags) != MNT_NOWAIT && 730 SCARG(uap, flags) != MNT_LAZY && 731 (SCARG(uap, flags) == MNT_WAIT || 732 SCARG(uap, flags) == 0) && 733 (error = VFS_STATFS(mp, sp, p)) != 0) { 734 simple_lock(&mountlist_slock); 735 nmp = CIRCLEQ_NEXT(mp, mnt_list); 736 vfs_unbusy(mp); 737 continue; 738 } 739 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 740 sp->f_oflags = sp->f_flags & 0xffff; 741 error = copyout(sp, sfsp, sizeof(*sp)); 742 if (error) { 743 vfs_unbusy(mp); 744 return (error); 745 } 746 sfsp += sizeof(*sp); 747 } 748 count++; 749 simple_lock(&mountlist_slock); 750 nmp = CIRCLEQ_NEXT(mp, mnt_list); 751 vfs_unbusy(mp); 752 } 753 simple_unlock(&mountlist_slock); 754 if (sfsp && count > maxcount) 755 *retval = maxcount; 756 else 757 *retval = count; 758 return (0); 759 } 760 761 /* 762 * Change current working directory to a given file descriptor. 763 */ 764 /* ARGSUSED */ 765 int 766 sys_fchdir(p, v, retval) 767 struct proc *p; 768 void *v; 769 register_t *retval; 770 { 771 struct sys_fchdir_args /* { 772 syscallarg(int) fd; 773 } */ *uap = v; 774 struct filedesc *fdp = p->p_fd; 775 struct cwdinfo *cwdi = p->p_cwdi; 776 struct vnode *vp, *tdp; 777 struct mount *mp; 778 struct file *fp; 779 int error; 780 781 /* getvnode() will use the descriptor for us */ 782 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 783 return (error); 784 vp = (struct vnode *)fp->f_data; 785 786 VREF(vp); 787 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 788 if (vp->v_type != VDIR) 789 error = ENOTDIR; 790 else 791 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 792 while (!error && (mp = vp->v_mountedhere) != NULL) { 793 if (vfs_busy(mp, 0, 0)) 794 continue; 795 error = VFS_ROOT(mp, &tdp); 796 vfs_unbusy(mp); 797 if (error) 798 break; 799 vput(vp); 800 vp = tdp; 801 } 802 if (error) { 803 vput(vp); 804 goto out; 805 } 806 VOP_UNLOCK(vp, 0); 807 808 /* 809 * Disallow changing to a directory not under the process's 810 * current root directory (if there is one). 811 */ 812 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 813 vrele(vp); 814 error = EPERM; /* operation not permitted */ 815 goto out; 816 } 817 818 vrele(cwdi->cwdi_cdir); 819 cwdi->cwdi_cdir = vp; 820 out: 821 FILE_UNUSE(fp, p); 822 return (error); 823 } 824 825 /* 826 * Change this process's notion of the root directory to a given file descriptor. 827 */ 828 829 int 830 sys_fchroot(p, v, retval) 831 struct proc *p; 832 void *v; 833 register_t *retval; 834 { 835 struct sys_fchroot_args *uap = v; 836 struct filedesc *fdp = p->p_fd; 837 struct cwdinfo *cwdi = p->p_cwdi; 838 struct vnode *vp; 839 struct file *fp; 840 int error; 841 842 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 843 return error; 844 /* getvnode() will use the descriptor for us */ 845 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 846 return error; 847 vp = (struct vnode *) fp->f_data; 848 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 849 if (vp->v_type != VDIR) 850 error = ENOTDIR; 851 else 852 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 853 VOP_UNLOCK(vp, 0); 854 if (error) 855 goto out; 856 VREF(vp); 857 858 /* 859 * Prevent escaping from chroot by putting the root under 860 * the working directory. Silently chdir to / if we aren't 861 * already there. 862 */ 863 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 864 /* 865 * XXX would be more failsafe to change directory to a 866 * deadfs node here instead 867 */ 868 vrele(cwdi->cwdi_cdir); 869 VREF(vp); 870 cwdi->cwdi_cdir = vp; 871 } 872 873 if (cwdi->cwdi_rdir != NULL) 874 vrele(cwdi->cwdi_rdir); 875 cwdi->cwdi_rdir = vp; 876 out: 877 FILE_UNUSE(fp, p); 878 return (error); 879 } 880 881 882 883 /* 884 * Change current working directory (``.''). 885 */ 886 /* ARGSUSED */ 887 int 888 sys_chdir(p, v, retval) 889 struct proc *p; 890 void *v; 891 register_t *retval; 892 { 893 struct sys_chdir_args /* { 894 syscallarg(const char *) path; 895 } */ *uap = v; 896 struct cwdinfo *cwdi = p->p_cwdi; 897 int error; 898 struct nameidata nd; 899 900 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 901 SCARG(uap, path), p); 902 if ((error = change_dir(&nd, p)) != 0) 903 return (error); 904 vrele(cwdi->cwdi_cdir); 905 cwdi->cwdi_cdir = nd.ni_vp; 906 return (0); 907 } 908 909 /* 910 * Change notion of root (``/'') directory. 911 */ 912 /* ARGSUSED */ 913 int 914 sys_chroot(p, v, retval) 915 struct proc *p; 916 void *v; 917 register_t *retval; 918 { 919 struct sys_chroot_args /* { 920 syscallarg(const char *) path; 921 } */ *uap = v; 922 struct cwdinfo *cwdi = p->p_cwdi; 923 struct vnode *vp; 924 int error; 925 struct nameidata nd; 926 927 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 928 return (error); 929 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 930 SCARG(uap, path), p); 931 if ((error = change_dir(&nd, p)) != 0) 932 return (error); 933 if (cwdi->cwdi_rdir != NULL) 934 vrele(cwdi->cwdi_rdir); 935 vp = nd.ni_vp; 936 cwdi->cwdi_rdir = vp; 937 938 /* 939 * Prevent escaping from chroot by putting the root under 940 * the working directory. Silently chdir to / if we aren't 941 * already there. 942 */ 943 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 944 /* 945 * XXX would be more failsafe to change directory to a 946 * deadfs node here instead 947 */ 948 vrele(cwdi->cwdi_cdir); 949 VREF(vp); 950 cwdi->cwdi_cdir = vp; 951 } 952 953 return (0); 954 } 955 956 /* 957 * Common routine for chroot and chdir. 958 */ 959 static int 960 change_dir(ndp, p) 961 struct nameidata *ndp; 962 struct proc *p; 963 { 964 struct vnode *vp; 965 int error; 966 967 if ((error = namei(ndp)) != 0) 968 return (error); 969 vp = ndp->ni_vp; 970 if (vp->v_type != VDIR) 971 error = ENOTDIR; 972 else 973 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 974 975 if (error) 976 vput(vp); 977 else 978 VOP_UNLOCK(vp, 0); 979 return (error); 980 } 981 982 /* 983 * Check permissions, allocate an open file structure, 984 * and call the device open routine if any. 985 */ 986 int 987 sys_open(p, v, retval) 988 struct proc *p; 989 void *v; 990 register_t *retval; 991 { 992 struct sys_open_args /* { 993 syscallarg(const char *) path; 994 syscallarg(int) flags; 995 syscallarg(int) mode; 996 } */ *uap = v; 997 struct cwdinfo *cwdi = p->p_cwdi; 998 struct filedesc *fdp = p->p_fd; 999 struct file *fp; 1000 struct vnode *vp; 1001 int flags, cmode; 1002 int type, indx, error; 1003 struct flock lf; 1004 struct nameidata nd; 1005 1006 flags = FFLAGS(SCARG(uap, flags)); 1007 if ((flags & (FREAD | FWRITE)) == 0) 1008 return (EINVAL); 1009 /* falloc() will use the file descriptor for us */ 1010 if ((error = falloc(p, &fp, &indx)) != 0) 1011 return (error); 1012 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1013 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1014 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1015 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1016 FILE_UNUSE(fp, p); 1017 ffree(fp); 1018 if ((error == ENODEV || error == ENXIO) && 1019 p->p_dupfd >= 0 && /* XXX from fdopen */ 1020 (error = 1021 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1022 *retval = indx; 1023 return (0); 1024 } 1025 if (error == ERESTART) 1026 error = EINTR; 1027 fdremove(fdp, indx); 1028 return (error); 1029 } 1030 p->p_dupfd = 0; 1031 vp = nd.ni_vp; 1032 fp->f_flag = flags & FMASK; 1033 fp->f_type = DTYPE_VNODE; 1034 fp->f_ops = &vnops; 1035 fp->f_data = (caddr_t)vp; 1036 if (flags & (O_EXLOCK | O_SHLOCK)) { 1037 lf.l_whence = SEEK_SET; 1038 lf.l_start = 0; 1039 lf.l_len = 0; 1040 if (flags & O_EXLOCK) 1041 lf.l_type = F_WRLCK; 1042 else 1043 lf.l_type = F_RDLCK; 1044 type = F_FLOCK; 1045 if ((flags & FNONBLOCK) == 0) 1046 type |= F_WAIT; 1047 VOP_UNLOCK(vp, 0); 1048 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1049 if (error) { 1050 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1051 FILE_UNUSE(fp, p); 1052 ffree(fp); 1053 fdremove(fdp, indx); 1054 return (error); 1055 } 1056 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1057 fp->f_flag |= FHASLOCK; 1058 } 1059 VOP_UNLOCK(vp, 0); 1060 *retval = indx; 1061 FILE_SET_MATURE(fp); 1062 FILE_UNUSE(fp, p); 1063 return (0); 1064 } 1065 1066 /* 1067 * Get file handle system call 1068 */ 1069 int 1070 sys_getfh(p, v, retval) 1071 struct proc *p; 1072 void *v; 1073 register_t *retval; 1074 { 1075 struct sys_getfh_args /* { 1076 syscallarg(char *) fname; 1077 syscallarg(fhandle_t *) fhp; 1078 } */ *uap = v; 1079 struct vnode *vp; 1080 fhandle_t fh; 1081 int error; 1082 struct nameidata nd; 1083 1084 /* 1085 * Must be super user 1086 */ 1087 error = suser(p->p_ucred, &p->p_acflag); 1088 if (error) 1089 return (error); 1090 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1091 SCARG(uap, fname), p); 1092 error = namei(&nd); 1093 if (error) 1094 return (error); 1095 vp = nd.ni_vp; 1096 memset((caddr_t)&fh, 0, sizeof(fh)); 1097 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1098 error = VFS_VPTOFH(vp, &fh.fh_fid); 1099 vput(vp); 1100 if (error) 1101 return (error); 1102 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1103 return (error); 1104 } 1105 1106 /* 1107 * Open a file given a file handle. 1108 * 1109 * Check permissions, allocate an open file structure, 1110 * and call the device open routine if any. 1111 */ 1112 int 1113 sys_fhopen(p, v, retval) 1114 struct proc *p; 1115 void *v; 1116 register_t *retval; 1117 { 1118 struct sys_fhopen_args /* { 1119 syscallarg(const fhandle_t *) fhp; 1120 syscallarg(int) flags; 1121 } */ *uap = v; 1122 struct filedesc *fdp = p->p_fd; 1123 struct file *fp; 1124 struct vnode *vp = NULL; 1125 struct mount *mp; 1126 struct ucred *cred = p->p_ucred; 1127 int flags; 1128 struct file *nfp; 1129 int type, indx, error=0; 1130 struct flock lf; 1131 struct vattr va; 1132 fhandle_t fh; 1133 1134 /* 1135 * Must be super user 1136 */ 1137 if ((error = suser(p->p_ucred, &p->p_acflag))) 1138 return (error); 1139 1140 flags = FFLAGS(SCARG(uap, flags)); 1141 if ((flags & (FREAD | FWRITE)) == 0) 1142 return (EINVAL); 1143 if ((flags & O_CREAT)) 1144 return (EINVAL); 1145 /* falloc() will use the file descriptor for us */ 1146 if ((error = falloc(p, &nfp, &indx)) != 0) 1147 return (error); 1148 fp = nfp; 1149 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1150 goto bad; 1151 1152 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1153 error = ESTALE; 1154 goto bad; 1155 } 1156 1157 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1158 vp = NULL; /* most likely unnecessary sanity for bad: */ 1159 goto bad; 1160 } 1161 1162 /* Now do an effective vn_open */ 1163 1164 if (vp->v_type == VSOCK) { 1165 error = EOPNOTSUPP; 1166 goto bad; 1167 } 1168 if (flags & FREAD) { 1169 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1170 goto bad; 1171 } 1172 if (flags & (FWRITE | O_TRUNC)) { 1173 if (vp->v_type == VDIR) { 1174 error = EISDIR; 1175 goto bad; 1176 } 1177 if ((error = vn_writechk(vp)) != 0 || 1178 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1179 goto bad; 1180 } 1181 if (flags & O_TRUNC) { 1182 VOP_UNLOCK(vp, 0); /* XXX */ 1183 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1184 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1185 VATTR_NULL(&va); 1186 va.va_size = 0; 1187 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1188 goto bad; 1189 } 1190 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1191 goto bad; 1192 if (vp->v_type == VREG && 1193 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1194 error = EIO; 1195 goto bad; 1196 } 1197 if (flags & FWRITE) 1198 vp->v_writecount++; 1199 1200 /* done with modified vn_open, now finish what sys_open does. */ 1201 1202 fp->f_flag = flags & FMASK; 1203 fp->f_type = DTYPE_VNODE; 1204 fp->f_ops = &vnops; 1205 fp->f_data = (caddr_t)vp; 1206 if (flags & (O_EXLOCK | O_SHLOCK)) { 1207 lf.l_whence = SEEK_SET; 1208 lf.l_start = 0; 1209 lf.l_len = 0; 1210 if (flags & O_EXLOCK) 1211 lf.l_type = F_WRLCK; 1212 else 1213 lf.l_type = F_RDLCK; 1214 type = F_FLOCK; 1215 if ((flags & FNONBLOCK) == 0) 1216 type |= F_WAIT; 1217 VOP_UNLOCK(vp, 0); 1218 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1219 if (error) { 1220 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1221 FILE_UNUSE(fp, p); 1222 ffree(fp); 1223 fdremove(fdp, indx); 1224 return (error); 1225 } 1226 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1227 fp->f_flag |= FHASLOCK; 1228 } 1229 VOP_UNLOCK(vp, 0); 1230 *retval = indx; 1231 FILE_SET_MATURE(fp); 1232 FILE_UNUSE(fp, p); 1233 return (0); 1234 1235 bad: 1236 FILE_UNUSE(fp, p); 1237 ffree(fp); 1238 fdremove(fdp, indx); 1239 if (vp != NULL) 1240 vput(vp); 1241 return (error); 1242 } 1243 1244 /* ARGSUSED */ 1245 int 1246 sys_fhstat(p, v, retval) 1247 struct proc *p; 1248 void *v; 1249 register_t *retval; 1250 { 1251 struct sys_fhstat_args /* { 1252 syscallarg(const fhandle_t *) fhp; 1253 syscallarg(struct stat *) sb; 1254 } */ *uap = v; 1255 struct stat sb; 1256 int error; 1257 fhandle_t fh; 1258 struct mount *mp; 1259 struct vnode *vp; 1260 1261 /* 1262 * Must be super user 1263 */ 1264 if ((error = suser(p->p_ucred, &p->p_acflag))) 1265 return (error); 1266 1267 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1268 return (error); 1269 1270 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1271 return (ESTALE); 1272 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1273 return (error); 1274 error = vn_stat(vp, &sb, p); 1275 vput(vp); 1276 if (error) 1277 return (error); 1278 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1279 return (error); 1280 } 1281 1282 /* ARGSUSED */ 1283 int 1284 sys_fhstatfs(p, v, retval) 1285 struct proc *p; 1286 void *v; 1287 register_t *retval; 1288 { 1289 struct sys_fhstatfs_args /* 1290 syscallarg(const fhandle_t *) fhp; 1291 syscallarg(struct statfs *) buf; 1292 } */ *uap = v; 1293 struct statfs sp; 1294 fhandle_t fh; 1295 struct mount *mp; 1296 struct vnode *vp; 1297 int error; 1298 1299 /* 1300 * Must be super user 1301 */ 1302 if ((error = suser(p->p_ucred, &p->p_acflag))) 1303 return (error); 1304 1305 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1306 return (error); 1307 1308 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1309 return (ESTALE); 1310 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1311 return (error); 1312 mp = vp->v_mount; 1313 vput(vp); 1314 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1315 return (error); 1316 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1317 sp.f_oflags = sp.f_flags & 0xffff; 1318 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1319 } 1320 1321 /* 1322 * Create a special file. 1323 */ 1324 /* ARGSUSED */ 1325 int 1326 sys_mknod(p, v, retval) 1327 struct proc *p; 1328 void *v; 1329 register_t *retval; 1330 { 1331 struct sys_mknod_args /* { 1332 syscallarg(const char *) path; 1333 syscallarg(int) mode; 1334 syscallarg(int) dev; 1335 } */ *uap = v; 1336 struct vnode *vp; 1337 struct vattr vattr; 1338 int error; 1339 int whiteout = 0; 1340 struct nameidata nd; 1341 1342 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1343 return (error); 1344 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1345 if ((error = namei(&nd)) != 0) 1346 return (error); 1347 vp = nd.ni_vp; 1348 if (vp != NULL) 1349 error = EEXIST; 1350 else { 1351 VATTR_NULL(&vattr); 1352 vattr.va_mode = 1353 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1354 vattr.va_rdev = SCARG(uap, dev); 1355 whiteout = 0; 1356 1357 switch (SCARG(uap, mode) & S_IFMT) { 1358 case S_IFMT: /* used by badsect to flag bad sectors */ 1359 vattr.va_type = VBAD; 1360 break; 1361 case S_IFCHR: 1362 vattr.va_type = VCHR; 1363 break; 1364 case S_IFBLK: 1365 vattr.va_type = VBLK; 1366 break; 1367 case S_IFWHT: 1368 whiteout = 1; 1369 break; 1370 default: 1371 error = EINVAL; 1372 break; 1373 } 1374 } 1375 if (!error) { 1376 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1377 if (whiteout) { 1378 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1379 if (error) 1380 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1381 vput(nd.ni_dvp); 1382 } else { 1383 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1384 &nd.ni_cnd, &vattr); 1385 if (error == 0) 1386 vput(nd.ni_vp); 1387 } 1388 } else { 1389 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1390 if (nd.ni_dvp == vp) 1391 vrele(nd.ni_dvp); 1392 else 1393 vput(nd.ni_dvp); 1394 if (vp) 1395 vrele(vp); 1396 } 1397 return (error); 1398 } 1399 1400 /* 1401 * Create a named pipe. 1402 */ 1403 /* ARGSUSED */ 1404 int 1405 sys_mkfifo(p, v, retval) 1406 struct proc *p; 1407 void *v; 1408 register_t *retval; 1409 { 1410 struct sys_mkfifo_args /* { 1411 syscallarg(const char *) path; 1412 syscallarg(int) mode; 1413 } */ *uap = v; 1414 struct vattr vattr; 1415 int error; 1416 struct nameidata nd; 1417 1418 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1419 if ((error = namei(&nd)) != 0) 1420 return (error); 1421 if (nd.ni_vp != NULL) { 1422 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1423 if (nd.ni_dvp == nd.ni_vp) 1424 vrele(nd.ni_dvp); 1425 else 1426 vput(nd.ni_dvp); 1427 vrele(nd.ni_vp); 1428 return (EEXIST); 1429 } 1430 VATTR_NULL(&vattr); 1431 vattr.va_type = VFIFO; 1432 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1433 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1434 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1435 if (error == 0) 1436 vput(nd.ni_vp); 1437 return (error); 1438 } 1439 1440 /* 1441 * Make a hard file link. 1442 */ 1443 /* ARGSUSED */ 1444 int 1445 sys_link(p, v, retval) 1446 struct proc *p; 1447 void *v; 1448 register_t *retval; 1449 { 1450 struct sys_link_args /* { 1451 syscallarg(const char *) path; 1452 syscallarg(const char *) link; 1453 } */ *uap = v; 1454 struct vnode *vp; 1455 struct nameidata nd; 1456 int error; 1457 1458 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1459 if ((error = namei(&nd)) != 0) 1460 return (error); 1461 vp = nd.ni_vp; 1462 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1463 if ((error = namei(&nd)) != 0) 1464 goto out; 1465 if (nd.ni_vp) { 1466 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1467 if (nd.ni_dvp == nd.ni_vp) 1468 vrele(nd.ni_dvp); 1469 else 1470 vput(nd.ni_dvp); 1471 vrele(nd.ni_vp); 1472 error = EEXIST; 1473 goto out; 1474 } 1475 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1476 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1477 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1478 out: 1479 vrele(vp); 1480 return (error); 1481 } 1482 1483 /* 1484 * Make a symbolic link. 1485 */ 1486 /* ARGSUSED */ 1487 int 1488 sys_symlink(p, v, retval) 1489 struct proc *p; 1490 void *v; 1491 register_t *retval; 1492 { 1493 struct sys_symlink_args /* { 1494 syscallarg(const char *) path; 1495 syscallarg(const char *) link; 1496 } */ *uap = v; 1497 struct vattr vattr; 1498 char *path; 1499 int error; 1500 struct nameidata nd; 1501 1502 path = PNBUF_GET(); 1503 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1504 if (error) 1505 goto out; 1506 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1507 if ((error = namei(&nd)) != 0) 1508 goto out; 1509 if (nd.ni_vp) { 1510 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1511 if (nd.ni_dvp == nd.ni_vp) 1512 vrele(nd.ni_dvp); 1513 else 1514 vput(nd.ni_dvp); 1515 vrele(nd.ni_vp); 1516 error = EEXIST; 1517 goto out; 1518 } 1519 VATTR_NULL(&vattr); 1520 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1521 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1522 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1523 if (error == 0) 1524 vput(nd.ni_vp); 1525 out: 1526 PNBUF_PUT(path); 1527 return (error); 1528 } 1529 1530 /* 1531 * Delete a whiteout from the filesystem. 1532 */ 1533 /* ARGSUSED */ 1534 int 1535 sys_undelete(p, v, retval) 1536 struct proc *p; 1537 void *v; 1538 register_t *retval; 1539 { 1540 struct sys_undelete_args /* { 1541 syscallarg(const char *) path; 1542 } */ *uap = v; 1543 int error; 1544 struct nameidata nd; 1545 1546 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1547 SCARG(uap, path), p); 1548 error = namei(&nd); 1549 if (error) 1550 return (error); 1551 1552 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1553 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1554 if (nd.ni_dvp == nd.ni_vp) 1555 vrele(nd.ni_dvp); 1556 else 1557 vput(nd.ni_dvp); 1558 if (nd.ni_vp) 1559 vrele(nd.ni_vp); 1560 return (EEXIST); 1561 } 1562 1563 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1564 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1565 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1566 vput(nd.ni_dvp); 1567 return (error); 1568 } 1569 1570 /* 1571 * Delete a name from the filesystem. 1572 */ 1573 /* ARGSUSED */ 1574 int 1575 sys_unlink(p, v, retval) 1576 struct proc *p; 1577 void *v; 1578 register_t *retval; 1579 { 1580 struct sys_unlink_args /* { 1581 syscallarg(const char *) path; 1582 } */ *uap = v; 1583 struct vnode *vp; 1584 int error; 1585 struct nameidata nd; 1586 1587 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1588 SCARG(uap, path), p); 1589 if ((error = namei(&nd)) != 0) 1590 return (error); 1591 vp = nd.ni_vp; 1592 1593 /* 1594 * The root of a mounted filesystem cannot be deleted. 1595 */ 1596 if (vp->v_flag & VROOT) { 1597 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1598 if (nd.ni_dvp == vp) 1599 vrele(nd.ni_dvp); 1600 else 1601 vput(nd.ni_dvp); 1602 vput(vp); 1603 error = EBUSY; 1604 goto out; 1605 } 1606 1607 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1608 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1609 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1610 out: 1611 return (error); 1612 } 1613 1614 /* 1615 * Reposition read/write file offset. 1616 */ 1617 int 1618 sys_lseek(p, v, retval) 1619 struct proc *p; 1620 void *v; 1621 register_t *retval; 1622 { 1623 struct sys_lseek_args /* { 1624 syscallarg(int) fd; 1625 syscallarg(int) pad; 1626 syscallarg(off_t) offset; 1627 syscallarg(int) whence; 1628 } */ *uap = v; 1629 struct ucred *cred = p->p_ucred; 1630 struct filedesc *fdp = p->p_fd; 1631 struct file *fp; 1632 struct vnode *vp; 1633 struct vattr vattr; 1634 off_t newoff; 1635 int error; 1636 1637 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1638 return (EBADF); 1639 1640 FILE_USE(fp); 1641 1642 vp = (struct vnode *)fp->f_data; 1643 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1644 error = ESPIPE; 1645 goto out; 1646 } 1647 1648 switch (SCARG(uap, whence)) { 1649 case SEEK_CUR: 1650 newoff = fp->f_offset + SCARG(uap, offset); 1651 break; 1652 case SEEK_END: 1653 error = VOP_GETATTR(vp, &vattr, cred, p); 1654 if (error) 1655 goto out; 1656 newoff = SCARG(uap, offset) + vattr.va_size; 1657 break; 1658 case SEEK_SET: 1659 newoff = SCARG(uap, offset); 1660 break; 1661 default: 1662 error = EINVAL; 1663 goto out; 1664 } 1665 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1666 goto out; 1667 1668 *(off_t *)retval = fp->f_offset = newoff; 1669 out: 1670 FILE_UNUSE(fp, p); 1671 return (error); 1672 } 1673 1674 /* 1675 * Positional read system call. 1676 */ 1677 int 1678 sys_pread(p, v, retval) 1679 struct proc *p; 1680 void *v; 1681 register_t *retval; 1682 { 1683 struct sys_pread_args /* { 1684 syscallarg(int) fd; 1685 syscallarg(void *) buf; 1686 syscallarg(size_t) nbyte; 1687 syscallarg(off_t) offset; 1688 } */ *uap = v; 1689 struct filedesc *fdp = p->p_fd; 1690 struct file *fp; 1691 struct vnode *vp; 1692 off_t offset; 1693 int error, fd = SCARG(uap, fd); 1694 1695 if ((fp = fd_getfile(fdp, fd)) == NULL) 1696 return (EBADF); 1697 1698 if ((fp->f_flag & FREAD) == 0) 1699 return (EBADF); 1700 1701 FILE_USE(fp); 1702 1703 vp = (struct vnode *)fp->f_data; 1704 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1705 error = ESPIPE; 1706 goto out; 1707 } 1708 1709 offset = SCARG(uap, offset); 1710 1711 /* 1712 * XXX This works because no file systems actually 1713 * XXX take any action on the seek operation. 1714 */ 1715 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1716 goto out; 1717 1718 /* dofileread() will unuse the descriptor for us */ 1719 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1720 &offset, 0, retval)); 1721 1722 out: 1723 FILE_UNUSE(fp, p); 1724 return (error); 1725 } 1726 1727 /* 1728 * Positional scatter read system call. 1729 */ 1730 int 1731 sys_preadv(p, v, retval) 1732 struct proc *p; 1733 void *v; 1734 register_t *retval; 1735 { 1736 struct sys_preadv_args /* { 1737 syscallarg(int) fd; 1738 syscallarg(const struct iovec *) iovp; 1739 syscallarg(int) iovcnt; 1740 syscallarg(off_t) offset; 1741 } */ *uap = v; 1742 struct filedesc *fdp = p->p_fd; 1743 struct file *fp; 1744 struct vnode *vp; 1745 off_t offset; 1746 int error, fd = SCARG(uap, fd); 1747 1748 if ((fp = fd_getfile(fdp, fd)) == NULL) 1749 return (EBADF); 1750 1751 if ((fp->f_flag & FREAD) == 0) 1752 return (EBADF); 1753 1754 FILE_USE(fp); 1755 1756 vp = (struct vnode *)fp->f_data; 1757 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1758 error = ESPIPE; 1759 goto out; 1760 } 1761 1762 offset = SCARG(uap, offset); 1763 1764 /* 1765 * XXX This works because no file systems actually 1766 * XXX take any action on the seek operation. 1767 */ 1768 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1769 goto out; 1770 1771 /* dofilereadv() will unuse the descriptor for us */ 1772 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1773 &offset, 0, retval)); 1774 1775 out: 1776 FILE_UNUSE(fp, p); 1777 return (error); 1778 } 1779 1780 /* 1781 * Positional write system call. 1782 */ 1783 int 1784 sys_pwrite(p, v, retval) 1785 struct proc *p; 1786 void *v; 1787 register_t *retval; 1788 { 1789 struct sys_pwrite_args /* { 1790 syscallarg(int) fd; 1791 syscallarg(const void *) buf; 1792 syscallarg(size_t) nbyte; 1793 syscallarg(off_t) offset; 1794 } */ *uap = v; 1795 struct filedesc *fdp = p->p_fd; 1796 struct file *fp; 1797 struct vnode *vp; 1798 off_t offset; 1799 int error, fd = SCARG(uap, fd); 1800 1801 if ((fp = fd_getfile(fdp, fd)) == NULL) 1802 return (EBADF); 1803 1804 if ((fp->f_flag & FWRITE) == 0) 1805 return (EBADF); 1806 1807 FILE_USE(fp); 1808 1809 vp = (struct vnode *)fp->f_data; 1810 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1811 error = ESPIPE; 1812 goto out; 1813 } 1814 1815 offset = SCARG(uap, offset); 1816 1817 /* 1818 * XXX This works because no file systems actually 1819 * XXX take any action on the seek operation. 1820 */ 1821 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1822 goto out; 1823 1824 /* dofilewrite() will unuse the descriptor for us */ 1825 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1826 &offset, 0, retval)); 1827 1828 out: 1829 FILE_UNUSE(fp, p); 1830 return (error); 1831 } 1832 1833 /* 1834 * Positional gather write system call. 1835 */ 1836 int 1837 sys_pwritev(p, v, retval) 1838 struct proc *p; 1839 void *v; 1840 register_t *retval; 1841 { 1842 struct sys_pwritev_args /* { 1843 syscallarg(int) fd; 1844 syscallarg(const struct iovec *) iovp; 1845 syscallarg(int) iovcnt; 1846 syscallarg(off_t) offset; 1847 } */ *uap = v; 1848 struct filedesc *fdp = p->p_fd; 1849 struct file *fp; 1850 struct vnode *vp; 1851 off_t offset; 1852 int error, fd = SCARG(uap, fd); 1853 1854 if ((fp = fd_getfile(fdp, fd)) == NULL) 1855 return (EBADF); 1856 1857 if ((fp->f_flag & FWRITE) == 0) 1858 return (EBADF); 1859 1860 FILE_USE(fp); 1861 1862 vp = (struct vnode *)fp->f_data; 1863 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1864 error = ESPIPE; 1865 goto out; 1866 } 1867 1868 offset = SCARG(uap, offset); 1869 1870 /* 1871 * XXX This works because no file systems actually 1872 * XXX take any action on the seek operation. 1873 */ 1874 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1875 goto out; 1876 1877 /* dofilewritev() will unuse the descriptor for us */ 1878 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1879 &offset, 0, retval)); 1880 1881 out: 1882 FILE_UNUSE(fp, p); 1883 return (error); 1884 } 1885 1886 /* 1887 * Check access permissions. 1888 */ 1889 int 1890 sys_access(p, v, retval) 1891 struct proc *p; 1892 void *v; 1893 register_t *retval; 1894 { 1895 struct sys_access_args /* { 1896 syscallarg(const char *) path; 1897 syscallarg(int) flags; 1898 } */ *uap = v; 1899 struct ucred *cred = crget(); 1900 struct vnode *vp; 1901 int error, flags; 1902 struct nameidata nd; 1903 1904 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 1905 cred->cr_ref = 1; 1906 cred->cr_uid = p->p_cred->p_ruid; 1907 cred->cr_gid = p->p_cred->p_rgid; 1908 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1909 SCARG(uap, path), p); 1910 /* Override default credentials */ 1911 nd.ni_cnd.cn_cred = cred; 1912 if ((error = namei(&nd)) != 0) 1913 goto out; 1914 vp = nd.ni_vp; 1915 1916 /* Flags == 0 means only check for existence. */ 1917 if (SCARG(uap, flags)) { 1918 flags = 0; 1919 if (SCARG(uap, flags) & R_OK) 1920 flags |= VREAD; 1921 if (SCARG(uap, flags) & W_OK) 1922 flags |= VWRITE; 1923 if (SCARG(uap, flags) & X_OK) 1924 flags |= VEXEC; 1925 1926 error = VOP_ACCESS(vp, flags, cred, p); 1927 if (!error && (flags & VWRITE)) 1928 error = vn_writechk(vp); 1929 } 1930 vput(vp); 1931 out: 1932 crfree(cred); 1933 return (error); 1934 } 1935 1936 /* 1937 * Get file status; this version follows links. 1938 */ 1939 /* ARGSUSED */ 1940 int 1941 sys___stat13(p, v, retval) 1942 struct proc *p; 1943 void *v; 1944 register_t *retval; 1945 { 1946 struct sys___stat13_args /* { 1947 syscallarg(const char *) path; 1948 syscallarg(struct stat *) ub; 1949 } */ *uap = v; 1950 struct stat sb; 1951 int error; 1952 struct nameidata nd; 1953 1954 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1955 SCARG(uap, path), p); 1956 if ((error = namei(&nd)) != 0) 1957 return (error); 1958 error = vn_stat(nd.ni_vp, &sb, p); 1959 vput(nd.ni_vp); 1960 if (error) 1961 return (error); 1962 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1963 return (error); 1964 } 1965 1966 /* 1967 * Get file status; this version does not follow links. 1968 */ 1969 /* ARGSUSED */ 1970 int 1971 sys___lstat13(p, v, retval) 1972 struct proc *p; 1973 void *v; 1974 register_t *retval; 1975 { 1976 struct sys___lstat13_args /* { 1977 syscallarg(const char *) path; 1978 syscallarg(struct stat *) ub; 1979 } */ *uap = v; 1980 struct stat sb; 1981 int error; 1982 struct nameidata nd; 1983 1984 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1985 SCARG(uap, path), p); 1986 if ((error = namei(&nd)) != 0) 1987 return (error); 1988 error = vn_stat(nd.ni_vp, &sb, p); 1989 vput(nd.ni_vp); 1990 if (error) 1991 return (error); 1992 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1993 return (error); 1994 } 1995 1996 /* 1997 * Get configurable pathname variables. 1998 */ 1999 /* ARGSUSED */ 2000 int 2001 sys_pathconf(p, v, retval) 2002 struct proc *p; 2003 void *v; 2004 register_t *retval; 2005 { 2006 struct sys_pathconf_args /* { 2007 syscallarg(const char *) path; 2008 syscallarg(int) name; 2009 } */ *uap = v; 2010 int error; 2011 struct nameidata nd; 2012 2013 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2014 SCARG(uap, path), p); 2015 if ((error = namei(&nd)) != 0) 2016 return (error); 2017 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2018 vput(nd.ni_vp); 2019 return (error); 2020 } 2021 2022 /* 2023 * Return target name of a symbolic link. 2024 */ 2025 /* ARGSUSED */ 2026 int 2027 sys_readlink(p, v, retval) 2028 struct proc *p; 2029 void *v; 2030 register_t *retval; 2031 { 2032 struct sys_readlink_args /* { 2033 syscallarg(const char *) path; 2034 syscallarg(char *) buf; 2035 syscallarg(size_t) count; 2036 } */ *uap = v; 2037 struct vnode *vp; 2038 struct iovec aiov; 2039 struct uio auio; 2040 int error; 2041 struct nameidata nd; 2042 2043 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2044 SCARG(uap, path), p); 2045 if ((error = namei(&nd)) != 0) 2046 return (error); 2047 vp = nd.ni_vp; 2048 if (vp->v_type != VLNK) 2049 error = EINVAL; 2050 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2051 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2052 aiov.iov_base = SCARG(uap, buf); 2053 aiov.iov_len = SCARG(uap, count); 2054 auio.uio_iov = &aiov; 2055 auio.uio_iovcnt = 1; 2056 auio.uio_offset = 0; 2057 auio.uio_rw = UIO_READ; 2058 auio.uio_segflg = UIO_USERSPACE; 2059 auio.uio_procp = p; 2060 auio.uio_resid = SCARG(uap, count); 2061 error = VOP_READLINK(vp, &auio, p->p_ucred); 2062 } 2063 vput(vp); 2064 *retval = SCARG(uap, count) - auio.uio_resid; 2065 return (error); 2066 } 2067 2068 /* 2069 * Change flags of a file given a path name. 2070 */ 2071 /* ARGSUSED */ 2072 int 2073 sys_chflags(p, v, retval) 2074 struct proc *p; 2075 void *v; 2076 register_t *retval; 2077 { 2078 struct sys_chflags_args /* { 2079 syscallarg(const char *) path; 2080 syscallarg(u_long) flags; 2081 } */ *uap = v; 2082 struct vnode *vp; 2083 int error; 2084 struct nameidata nd; 2085 2086 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2087 if ((error = namei(&nd)) != 0) 2088 return (error); 2089 vp = nd.ni_vp; 2090 error = change_flags(vp, SCARG(uap, flags), p); 2091 vput(vp); 2092 return (error); 2093 } 2094 2095 /* 2096 * Change flags of a file given a file descriptor. 2097 */ 2098 /* ARGSUSED */ 2099 int 2100 sys_fchflags(p, v, retval) 2101 struct proc *p; 2102 void *v; 2103 register_t *retval; 2104 { 2105 struct sys_fchflags_args /* { 2106 syscallarg(int) fd; 2107 syscallarg(u_long) flags; 2108 } */ *uap = v; 2109 struct vnode *vp; 2110 struct file *fp; 2111 int error; 2112 2113 /* getvnode() will use the descriptor for us */ 2114 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2115 return (error); 2116 vp = (struct vnode *)fp->f_data; 2117 error = change_flags(vp, SCARG(uap, flags), p); 2118 VOP_UNLOCK(vp, 0); 2119 FILE_UNUSE(fp, p); 2120 return (error); 2121 } 2122 2123 /* 2124 * Change flags of a file given a path name; this version does 2125 * not follow links. 2126 */ 2127 int 2128 sys_lchflags(p, v, retval) 2129 struct proc *p; 2130 void *v; 2131 register_t *retval; 2132 { 2133 struct sys_lchflags_args /* { 2134 syscallarg(const char *) path; 2135 syscallarg(u_long) flags; 2136 } */ *uap = v; 2137 struct vnode *vp; 2138 int error; 2139 struct nameidata nd; 2140 2141 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2142 if ((error = namei(&nd)) != 0) 2143 return (error); 2144 vp = nd.ni_vp; 2145 error = change_flags(vp, SCARG(uap, flags), p); 2146 vput(vp); 2147 return (error); 2148 } 2149 2150 /* 2151 * Common routine to change flags of a file. 2152 */ 2153 int 2154 change_flags(vp, flags, p) 2155 struct vnode *vp; 2156 u_long flags; 2157 struct proc *p; 2158 { 2159 struct vattr vattr; 2160 int error; 2161 2162 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2163 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2164 /* 2165 * Non-superusers cannot change the flags on devices, even if they 2166 * own them. 2167 */ 2168 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2169 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2170 goto out; 2171 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2172 error = EINVAL; 2173 goto out; 2174 } 2175 } 2176 VATTR_NULL(&vattr); 2177 vattr.va_flags = flags; 2178 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2179 out: 2180 return (error); 2181 } 2182 2183 /* 2184 * Change mode of a file given path name; this version follows links. 2185 */ 2186 /* ARGSUSED */ 2187 int 2188 sys_chmod(p, v, retval) 2189 struct proc *p; 2190 void *v; 2191 register_t *retval; 2192 { 2193 struct sys_chmod_args /* { 2194 syscallarg(const char *) path; 2195 syscallarg(int) mode; 2196 } */ *uap = v; 2197 int error; 2198 struct nameidata nd; 2199 2200 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2201 if ((error = namei(&nd)) != 0) 2202 return (error); 2203 2204 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2205 2206 vrele(nd.ni_vp); 2207 return (error); 2208 } 2209 2210 /* 2211 * Change mode of a file given a file descriptor. 2212 */ 2213 /* ARGSUSED */ 2214 int 2215 sys_fchmod(p, v, retval) 2216 struct proc *p; 2217 void *v; 2218 register_t *retval; 2219 { 2220 struct sys_fchmod_args /* { 2221 syscallarg(int) fd; 2222 syscallarg(int) mode; 2223 } */ *uap = v; 2224 struct file *fp; 2225 int error; 2226 2227 /* getvnode() will use the descriptor for us */ 2228 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2229 return (error); 2230 2231 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2232 FILE_UNUSE(fp, p); 2233 return (error); 2234 } 2235 2236 /* 2237 * Change mode of a file given path name; this version does not follow links. 2238 */ 2239 /* ARGSUSED */ 2240 int 2241 sys_lchmod(p, v, retval) 2242 struct proc *p; 2243 void *v; 2244 register_t *retval; 2245 { 2246 struct sys_lchmod_args /* { 2247 syscallarg(const char *) path; 2248 syscallarg(int) mode; 2249 } */ *uap = v; 2250 int error; 2251 struct nameidata nd; 2252 2253 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2254 if ((error = namei(&nd)) != 0) 2255 return (error); 2256 2257 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2258 2259 vrele(nd.ni_vp); 2260 return (error); 2261 } 2262 2263 /* 2264 * Common routine to set mode given a vnode. 2265 */ 2266 static int 2267 change_mode(vp, mode, p) 2268 struct vnode *vp; 2269 int mode; 2270 struct proc *p; 2271 { 2272 struct vattr vattr; 2273 int error; 2274 2275 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2276 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2277 VATTR_NULL(&vattr); 2278 vattr.va_mode = mode & ALLPERMS; 2279 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2280 VOP_UNLOCK(vp, 0); 2281 return (error); 2282 } 2283 2284 /* 2285 * Set ownership given a path name; this version follows links. 2286 */ 2287 /* ARGSUSED */ 2288 int 2289 sys_chown(p, v, retval) 2290 struct proc *p; 2291 void *v; 2292 register_t *retval; 2293 { 2294 struct sys_chown_args /* { 2295 syscallarg(const char *) path; 2296 syscallarg(uid_t) uid; 2297 syscallarg(gid_t) gid; 2298 } */ *uap = v; 2299 int error; 2300 struct nameidata nd; 2301 2302 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2303 if ((error = namei(&nd)) != 0) 2304 return (error); 2305 2306 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2307 2308 vrele(nd.ni_vp); 2309 return (error); 2310 } 2311 2312 /* 2313 * Set ownership given a path name; this version follows links. 2314 * Provides POSIX semantics. 2315 */ 2316 /* ARGSUSED */ 2317 int 2318 sys___posix_chown(p, v, retval) 2319 struct proc *p; 2320 void *v; 2321 register_t *retval; 2322 { 2323 struct sys_chown_args /* { 2324 syscallarg(const char *) path; 2325 syscallarg(uid_t) uid; 2326 syscallarg(gid_t) gid; 2327 } */ *uap = v; 2328 int error; 2329 struct nameidata nd; 2330 2331 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2332 if ((error = namei(&nd)) != 0) 2333 return (error); 2334 2335 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2336 2337 vrele(nd.ni_vp); 2338 return (error); 2339 } 2340 2341 /* 2342 * Set ownership given a file descriptor. 2343 */ 2344 /* ARGSUSED */ 2345 int 2346 sys_fchown(p, v, retval) 2347 struct proc *p; 2348 void *v; 2349 register_t *retval; 2350 { 2351 struct sys_fchown_args /* { 2352 syscallarg(int) fd; 2353 syscallarg(uid_t) uid; 2354 syscallarg(gid_t) gid; 2355 } */ *uap = v; 2356 int error; 2357 struct file *fp; 2358 2359 /* getvnode() will use the descriptor for us */ 2360 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2361 return (error); 2362 2363 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2364 SCARG(uap, gid), p, 0); 2365 FILE_UNUSE(fp, p); 2366 return (error); 2367 } 2368 2369 /* 2370 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2371 */ 2372 /* ARGSUSED */ 2373 int 2374 sys___posix_fchown(p, v, retval) 2375 struct proc *p; 2376 void *v; 2377 register_t *retval; 2378 { 2379 struct sys_fchown_args /* { 2380 syscallarg(int) fd; 2381 syscallarg(uid_t) uid; 2382 syscallarg(gid_t) gid; 2383 } */ *uap = v; 2384 int error; 2385 struct file *fp; 2386 2387 /* getvnode() will use the descriptor for us */ 2388 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2389 return (error); 2390 2391 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2392 SCARG(uap, gid), p, 1); 2393 FILE_UNUSE(fp, p); 2394 return (error); 2395 } 2396 2397 /* 2398 * Set ownership given a path name; this version does not follow links. 2399 */ 2400 /* ARGSUSED */ 2401 int 2402 sys_lchown(p, v, retval) 2403 struct proc *p; 2404 void *v; 2405 register_t *retval; 2406 { 2407 struct sys_lchown_args /* { 2408 syscallarg(const char *) path; 2409 syscallarg(uid_t) uid; 2410 syscallarg(gid_t) gid; 2411 } */ *uap = v; 2412 int error; 2413 struct nameidata nd; 2414 2415 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2416 if ((error = namei(&nd)) != 0) 2417 return (error); 2418 2419 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2420 2421 vrele(nd.ni_vp); 2422 return (error); 2423 } 2424 2425 /* 2426 * Set ownership given a path name; this version does not follow links. 2427 * Provides POSIX/XPG semantics. 2428 */ 2429 /* ARGSUSED */ 2430 int 2431 sys___posix_lchown(p, v, retval) 2432 struct proc *p; 2433 void *v; 2434 register_t *retval; 2435 { 2436 struct sys_lchown_args /* { 2437 syscallarg(const char *) path; 2438 syscallarg(uid_t) uid; 2439 syscallarg(gid_t) gid; 2440 } */ *uap = v; 2441 int error; 2442 struct nameidata nd; 2443 2444 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2445 if ((error = namei(&nd)) != 0) 2446 return (error); 2447 2448 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2449 2450 vrele(nd.ni_vp); 2451 return (error); 2452 } 2453 2454 /* 2455 * Common routine to set ownership given a vnode. 2456 */ 2457 static int 2458 change_owner(vp, uid, gid, p, posix_semantics) 2459 struct vnode *vp; 2460 uid_t uid; 2461 gid_t gid; 2462 struct proc *p; 2463 int posix_semantics; 2464 { 2465 struct vattr vattr; 2466 mode_t newmode; 2467 int error; 2468 2469 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2470 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2471 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2472 goto out; 2473 2474 #define CHANGED(x) ((int)(x) != -1) 2475 newmode = vattr.va_mode; 2476 if (posix_semantics) { 2477 /* 2478 * POSIX/XPG semantics: if the caller is not the super-user, 2479 * clear set-user-id and set-group-id bits. Both POSIX and 2480 * the XPG consider the behaviour for calls by the super-user 2481 * implementation-defined; we leave the set-user-id and set- 2482 * group-id settings intact in that case. 2483 */ 2484 if (suser(p->p_ucred, NULL) != 0) 2485 newmode &= ~(S_ISUID | S_ISGID); 2486 } else { 2487 /* 2488 * NetBSD semantics: when changing owner and/or group, 2489 * clear the respective bit(s). 2490 */ 2491 if (CHANGED(uid)) 2492 newmode &= ~S_ISUID; 2493 if (CHANGED(gid)) 2494 newmode &= ~S_ISGID; 2495 } 2496 /* Update va_mode iff altered. */ 2497 if (vattr.va_mode == newmode) 2498 newmode = VNOVAL; 2499 2500 VATTR_NULL(&vattr); 2501 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2502 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2503 vattr.va_mode = newmode; 2504 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2505 #undef CHANGED 2506 2507 out: 2508 VOP_UNLOCK(vp, 0); 2509 return (error); 2510 } 2511 2512 /* 2513 * Set the access and modification times given a path name; this 2514 * version follows links. 2515 */ 2516 /* ARGSUSED */ 2517 int 2518 sys_utimes(p, v, retval) 2519 struct proc *p; 2520 void *v; 2521 register_t *retval; 2522 { 2523 struct sys_utimes_args /* { 2524 syscallarg(const char *) path; 2525 syscallarg(const struct timeval *) tptr; 2526 } */ *uap = v; 2527 int error; 2528 struct nameidata nd; 2529 2530 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2531 if ((error = namei(&nd)) != 0) 2532 return (error); 2533 2534 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2535 2536 vrele(nd.ni_vp); 2537 return (error); 2538 } 2539 2540 /* 2541 * Set the access and modification times given a file descriptor. 2542 */ 2543 /* ARGSUSED */ 2544 int 2545 sys_futimes(p, v, retval) 2546 struct proc *p; 2547 void *v; 2548 register_t *retval; 2549 { 2550 struct sys_futimes_args /* { 2551 syscallarg(int) fd; 2552 syscallarg(const struct timeval *) tptr; 2553 } */ *uap = v; 2554 int error; 2555 struct file *fp; 2556 2557 /* getvnode() will use the descriptor for us */ 2558 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2559 return (error); 2560 2561 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2562 FILE_UNUSE(fp, p); 2563 return (error); 2564 } 2565 2566 /* 2567 * Set the access and modification times given a path name; this 2568 * version does not follow links. 2569 */ 2570 /* ARGSUSED */ 2571 int 2572 sys_lutimes(p, v, retval) 2573 struct proc *p; 2574 void *v; 2575 register_t *retval; 2576 { 2577 struct sys_lutimes_args /* { 2578 syscallarg(const char *) path; 2579 syscallarg(const struct timeval *) tptr; 2580 } */ *uap = v; 2581 int error; 2582 struct nameidata nd; 2583 2584 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2585 if ((error = namei(&nd)) != 0) 2586 return (error); 2587 2588 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2589 2590 vrele(nd.ni_vp); 2591 return (error); 2592 } 2593 2594 /* 2595 * Common routine to set access and modification times given a vnode. 2596 */ 2597 static int 2598 change_utimes(vp, tptr, p) 2599 struct vnode *vp; 2600 const struct timeval *tptr; 2601 struct proc *p; 2602 { 2603 struct timeval tv[2]; 2604 struct vattr vattr; 2605 int error; 2606 2607 VATTR_NULL(&vattr); 2608 if (tptr == NULL) { 2609 microtime(&tv[0]); 2610 tv[1] = tv[0]; 2611 vattr.va_vaflags |= VA_UTIMES_NULL; 2612 } else { 2613 error = copyin(tptr, tv, sizeof(tv)); 2614 if (error) 2615 return (error); 2616 } 2617 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2618 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2619 vattr.va_atime.tv_sec = tv[0].tv_sec; 2620 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2621 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2622 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2623 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2624 VOP_UNLOCK(vp, 0); 2625 return (error); 2626 } 2627 2628 /* 2629 * Truncate a file given its path name. 2630 */ 2631 /* ARGSUSED */ 2632 int 2633 sys_truncate(p, v, retval) 2634 struct proc *p; 2635 void *v; 2636 register_t *retval; 2637 { 2638 struct sys_truncate_args /* { 2639 syscallarg(const char *) path; 2640 syscallarg(int) pad; 2641 syscallarg(off_t) length; 2642 } */ *uap = v; 2643 struct vnode *vp; 2644 struct vattr vattr; 2645 int error; 2646 struct nameidata nd; 2647 2648 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2649 if ((error = namei(&nd)) != 0) 2650 return (error); 2651 vp = nd.ni_vp; 2652 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2653 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2654 if (vp->v_type == VDIR) 2655 error = EISDIR; 2656 else if ((error = vn_writechk(vp)) == 0 && 2657 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2658 VATTR_NULL(&vattr); 2659 vattr.va_size = SCARG(uap, length); 2660 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2661 } 2662 vput(vp); 2663 return (error); 2664 } 2665 2666 /* 2667 * Truncate a file given a file descriptor. 2668 */ 2669 /* ARGSUSED */ 2670 int 2671 sys_ftruncate(p, v, retval) 2672 struct proc *p; 2673 void *v; 2674 register_t *retval; 2675 { 2676 struct sys_ftruncate_args /* { 2677 syscallarg(int) fd; 2678 syscallarg(int) pad; 2679 syscallarg(off_t) length; 2680 } */ *uap = v; 2681 struct vattr vattr; 2682 struct vnode *vp; 2683 struct file *fp; 2684 int error; 2685 2686 /* getvnode() will use the descriptor for us */ 2687 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2688 return (error); 2689 if ((fp->f_flag & FWRITE) == 0) { 2690 error = EINVAL; 2691 goto out; 2692 } 2693 vp = (struct vnode *)fp->f_data; 2694 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2695 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2696 if (vp->v_type == VDIR) 2697 error = EISDIR; 2698 else if ((error = vn_writechk(vp)) == 0) { 2699 VATTR_NULL(&vattr); 2700 vattr.va_size = SCARG(uap, length); 2701 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2702 } 2703 VOP_UNLOCK(vp, 0); 2704 out: 2705 FILE_UNUSE(fp, p); 2706 return (error); 2707 } 2708 2709 /* 2710 * Sync an open file. 2711 */ 2712 /* ARGSUSED */ 2713 int 2714 sys_fsync(p, v, retval) 2715 struct proc *p; 2716 void *v; 2717 register_t *retval; 2718 { 2719 struct sys_fsync_args /* { 2720 syscallarg(int) fd; 2721 } */ *uap = v; 2722 struct vnode *vp; 2723 struct file *fp; 2724 int error; 2725 2726 /* getvnode() will use the descriptor for us */ 2727 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2728 return (error); 2729 vp = (struct vnode *)fp->f_data; 2730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2731 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2732 if (error == 0 && bioops.io_fsync != NULL && 2733 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2734 (*bioops.io_fsync)(vp); 2735 VOP_UNLOCK(vp, 0); 2736 FILE_UNUSE(fp, p); 2737 return (error); 2738 } 2739 2740 /* 2741 * Sync the data of an open file. 2742 */ 2743 /* ARGSUSED */ 2744 int 2745 sys_fdatasync(p, v, retval) 2746 struct proc *p; 2747 void *v; 2748 register_t *retval; 2749 { 2750 struct sys_fdatasync_args /* { 2751 syscallarg(int) fd; 2752 } */ *uap = v; 2753 struct vnode *vp; 2754 struct file *fp; 2755 int error; 2756 2757 /* getvnode() will use the descriptor for us */ 2758 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2759 return (error); 2760 vp = (struct vnode *)fp->f_data; 2761 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2762 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2763 VOP_UNLOCK(vp, 0); 2764 FILE_UNUSE(fp, p); 2765 return (error); 2766 } 2767 2768 /* 2769 * Rename files, (standard) BSD semantics frontend. 2770 */ 2771 /* ARGSUSED */ 2772 int 2773 sys_rename(p, v, retval) 2774 struct proc *p; 2775 void *v; 2776 register_t *retval; 2777 { 2778 struct sys_rename_args /* { 2779 syscallarg(const char *) from; 2780 syscallarg(const char *) to; 2781 } */ *uap = v; 2782 2783 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2784 } 2785 2786 /* 2787 * Rename files, POSIX semantics frontend. 2788 */ 2789 /* ARGSUSED */ 2790 int 2791 sys___posix_rename(p, v, retval) 2792 struct proc *p; 2793 void *v; 2794 register_t *retval; 2795 { 2796 struct sys___posix_rename_args /* { 2797 syscallarg(const char *) from; 2798 syscallarg(const char *) to; 2799 } */ *uap = v; 2800 2801 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2802 } 2803 2804 /* 2805 * Rename files. Source and destination must either both be directories, 2806 * or both not be directories. If target is a directory, it must be empty. 2807 * If `from' and `to' refer to the same object, the value of the `retain' 2808 * argument is used to determine whether `from' will be 2809 * 2810 * (retain == 0) deleted unless `from' and `to' refer to the same 2811 * object in the file system's name space (BSD). 2812 * (retain == 1) always retained (POSIX). 2813 */ 2814 static int 2815 rename_files(from, to, p, retain) 2816 const char *from, *to; 2817 struct proc *p; 2818 int retain; 2819 { 2820 struct vnode *tvp, *fvp, *tdvp; 2821 struct nameidata fromnd, tond; 2822 int error; 2823 2824 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2825 from, p); 2826 if ((error = namei(&fromnd)) != 0) 2827 return (error); 2828 fvp = fromnd.ni_vp; 2829 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2830 UIO_USERSPACE, to, p); 2831 if ((error = namei(&tond)) != 0) { 2832 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2833 vrele(fromnd.ni_dvp); 2834 vrele(fvp); 2835 goto out1; 2836 } 2837 tdvp = tond.ni_dvp; 2838 tvp = tond.ni_vp; 2839 2840 if (tvp != NULL) { 2841 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2842 error = ENOTDIR; 2843 goto out; 2844 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2845 error = EISDIR; 2846 goto out; 2847 } 2848 } 2849 2850 if (fvp == tdvp) 2851 error = EINVAL; 2852 2853 /* 2854 * Source and destination refer to the same object. 2855 */ 2856 if (fvp == tvp) { 2857 if (retain) 2858 error = -1; 2859 else if (fromnd.ni_dvp == tdvp && 2860 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2861 !memcmp(fromnd.ni_cnd.cn_nameptr, 2862 tond.ni_cnd.cn_nameptr, 2863 fromnd.ni_cnd.cn_namelen)) 2864 error = -1; 2865 } 2866 2867 out: 2868 if (!error) { 2869 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2870 if (fromnd.ni_dvp != tdvp) 2871 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2872 if (tvp) { 2873 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2874 } 2875 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2876 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2877 } else { 2878 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2879 if (tdvp == tvp) 2880 vrele(tdvp); 2881 else 2882 vput(tdvp); 2883 if (tvp) 2884 vput(tvp); 2885 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2886 vrele(fromnd.ni_dvp); 2887 vrele(fvp); 2888 } 2889 vrele(tond.ni_startdir); 2890 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2891 out1: 2892 if (fromnd.ni_startdir) 2893 vrele(fromnd.ni_startdir); 2894 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2895 return (error == -1 ? 0 : error); 2896 } 2897 2898 /* 2899 * Make a directory file. 2900 */ 2901 /* ARGSUSED */ 2902 int 2903 sys_mkdir(p, v, retval) 2904 struct proc *p; 2905 void *v; 2906 register_t *retval; 2907 { 2908 struct sys_mkdir_args /* { 2909 syscallarg(const char *) path; 2910 syscallarg(int) mode; 2911 } */ *uap = v; 2912 struct vnode *vp; 2913 struct vattr vattr; 2914 int error; 2915 struct nameidata nd; 2916 2917 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2918 if ((error = namei(&nd)) != 0) 2919 return (error); 2920 vp = nd.ni_vp; 2921 if (vp != NULL) { 2922 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2923 if (nd.ni_dvp == vp) 2924 vrele(nd.ni_dvp); 2925 else 2926 vput(nd.ni_dvp); 2927 vrele(vp); 2928 return (EEXIST); 2929 } 2930 VATTR_NULL(&vattr); 2931 vattr.va_type = VDIR; 2932 vattr.va_mode = 2933 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2934 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2935 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2936 if (!error) 2937 vput(nd.ni_vp); 2938 return (error); 2939 } 2940 2941 /* 2942 * Remove a directory file. 2943 */ 2944 /* ARGSUSED */ 2945 int 2946 sys_rmdir(p, v, retval) 2947 struct proc *p; 2948 void *v; 2949 register_t *retval; 2950 { 2951 struct sys_rmdir_args /* { 2952 syscallarg(const char *) path; 2953 } */ *uap = v; 2954 struct vnode *vp; 2955 int error; 2956 struct nameidata nd; 2957 2958 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2959 SCARG(uap, path), p); 2960 if ((error = namei(&nd)) != 0) 2961 return (error); 2962 vp = nd.ni_vp; 2963 if (vp->v_type != VDIR) { 2964 error = ENOTDIR; 2965 goto out; 2966 } 2967 /* 2968 * No rmdir "." please. 2969 */ 2970 if (nd.ni_dvp == vp) { 2971 error = EINVAL; 2972 goto out; 2973 } 2974 /* 2975 * The root of a mounted filesystem cannot be deleted. 2976 */ 2977 if (vp->v_flag & VROOT) 2978 error = EBUSY; 2979 out: 2980 if (!error) { 2981 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2982 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2983 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2984 } else { 2985 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2986 if (nd.ni_dvp == vp) 2987 vrele(nd.ni_dvp); 2988 else 2989 vput(nd.ni_dvp); 2990 vput(vp); 2991 } 2992 return (error); 2993 } 2994 2995 /* 2996 * Read a block of directory entries in a file system independent format. 2997 */ 2998 int 2999 sys_getdents(p, v, retval) 3000 struct proc *p; 3001 void *v; 3002 register_t *retval; 3003 { 3004 struct sys_getdents_args /* { 3005 syscallarg(int) fd; 3006 syscallarg(char *) buf; 3007 syscallarg(size_t) count; 3008 } */ *uap = v; 3009 struct file *fp; 3010 int error, done; 3011 3012 /* getvnode() will use the descriptor for us */ 3013 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3014 return (error); 3015 if ((fp->f_flag & FREAD) == 0) { 3016 error = EBADF; 3017 goto out; 3018 } 3019 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3020 SCARG(uap, count), &done, p, 0, 0); 3021 *retval = done; 3022 out: 3023 FILE_UNUSE(fp, p); 3024 return (error); 3025 } 3026 3027 /* 3028 * Set the mode mask for creation of filesystem nodes. 3029 */ 3030 int 3031 sys_umask(p, v, retval) 3032 struct proc *p; 3033 void *v; 3034 register_t *retval; 3035 { 3036 struct sys_umask_args /* { 3037 syscallarg(mode_t) newmask; 3038 } */ *uap = v; 3039 struct cwdinfo *cwdi; 3040 3041 cwdi = p->p_cwdi; 3042 *retval = cwdi->cwdi_cmask; 3043 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3044 return (0); 3045 } 3046 3047 /* 3048 * Void all references to file by ripping underlying filesystem 3049 * away from vnode. 3050 */ 3051 /* ARGSUSED */ 3052 int 3053 sys_revoke(p, v, retval) 3054 struct proc *p; 3055 void *v; 3056 register_t *retval; 3057 { 3058 struct sys_revoke_args /* { 3059 syscallarg(const char *) path; 3060 } */ *uap = v; 3061 struct vnode *vp; 3062 struct vattr vattr; 3063 int error; 3064 struct nameidata nd; 3065 3066 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3067 if ((error = namei(&nd)) != 0) 3068 return (error); 3069 vp = nd.ni_vp; 3070 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3071 goto out; 3072 if (p->p_ucred->cr_uid != vattr.va_uid && 3073 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3074 goto out; 3075 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3076 VOP_REVOKE(vp, REVOKEALL); 3077 out: 3078 vrele(vp); 3079 return (error); 3080 } 3081 3082 /* 3083 * Convert a user file descriptor to a kernel file entry. 3084 */ 3085 int 3086 getvnode(fdp, fd, fpp) 3087 struct filedesc *fdp; 3088 int fd; 3089 struct file **fpp; 3090 { 3091 struct vnode *vp; 3092 struct file *fp; 3093 3094 if ((fp = fd_getfile(fdp, fd)) == NULL) 3095 return (EBADF); 3096 3097 FILE_USE(fp); 3098 3099 if (fp->f_type != DTYPE_VNODE) { 3100 FILE_UNUSE(fp, NULL); 3101 return (EINVAL); 3102 } 3103 3104 vp = (struct vnode *)fp->f_data; 3105 if (vp->v_type == VBAD) { 3106 FILE_UNUSE(fp, NULL); 3107 return (EBADF); 3108 } 3109 3110 *fpp = fp; 3111 return (0); 3112 } 3113
Indexes created Sat Sep 27 14:09:57 GMT 2025