vfs_syscalls.c revision 1.165
1 /* $NetBSD: vfs_syscalls.c,v 1.165 2001/04/16 22:41:11 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 #include <sys/syscallargs.h> 60 61 #include <miscfs/genfs/genfs.h> 62 #include <miscfs/syncfs/syncfs.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <sys/sysctl.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 /* 90 * This table is used to maintain compatibility with 4.3BSD 91 * and NetBSD 0.9 mount syscalls. Note, the order is important! 92 * 93 * Also note that not all of these had actual numbers in 4.3BSD 94 * or NetBSD 0.9! 95 */ 96 const char *mountcompatnames[] = { 97 NULL, /* 0 = MOUNT_NONE */ 98 MOUNT_FFS, /* 1 */ 99 MOUNT_NFS, /* 2 */ 100 MOUNT_MFS, /* 3 */ 101 MOUNT_MSDOS, /* 4 */ 102 MOUNT_LFS, /* 5 */ 103 NULL, /* 6 = MOUNT_LOFS */ 104 MOUNT_FDESC, /* 7 */ 105 MOUNT_PORTAL, /* 8 */ 106 MOUNT_NULL, /* 9 */ 107 MOUNT_UMAP, /* 10 */ 108 MOUNT_KERNFS, /* 11 */ 109 MOUNT_PROCFS, /* 12 */ 110 MOUNT_AFS, /* 13 */ 111 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 112 MOUNT_UNION, /* 15 */ 113 MOUNT_ADOSFS, /* 16 */ 114 MOUNT_EXT2FS, /* 17 */ 115 MOUNT_CODA, /* 18 */ 116 MOUNT_FILECORE, /* 19 */ 117 MOUNT_NTFS, /* 20 */ 118 }; 119 const int nmountcompatnames = sizeof(mountcompatnames) / 120 sizeof(mountcompatnames[0]); 121 122 /* ARGSUSED */ 123 int 124 sys_mount(p, v, retval) 125 struct proc *p; 126 void *v; 127 register_t *retval; 128 { 129 struct sys_mount_args /* { 130 syscallarg(const char *) type; 131 syscallarg(const char *) path; 132 syscallarg(int) flags; 133 syscallarg(void *) data; 134 } */ *uap = v; 135 struct vnode *vp; 136 struct mount *mp; 137 int error, flag = 0; 138 char fstypename[MFSNAMELEN]; 139 struct vattr va; 140 struct nameidata nd; 141 struct vfsops *vfs; 142 143 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 144 return (error); 145 /* 146 * Get vnode to be covered 147 */ 148 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 149 SCARG(uap, path), p); 150 if ((error = namei(&nd)) != 0) 151 return (error); 152 vp = nd.ni_vp; 153 /* 154 * A lookup in VFS_MOUNT might result in an attempt to 155 * lock this vnode again, so make the lock resursive. 156 */ 157 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 158 if (SCARG(uap, flags) & MNT_UPDATE) { 159 if ((vp->v_flag & VROOT) == 0) { 160 vput(vp); 161 return (EINVAL); 162 } 163 mp = vp->v_mount; 164 flag = mp->mnt_flag; 165 vfs = mp->mnt_op; 166 /* 167 * We only allow the filesystem to be reloaded if it 168 * is currently mounted read-only. 169 */ 170 if ((SCARG(uap, flags) & MNT_RELOAD) && 171 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 172 vput(vp); 173 return (EOPNOTSUPP); /* Needs translation */ 174 } 175 /* 176 * In "highly secure" mode, don't let the caller do anything 177 * but downgrade a filesystem from read-write to read-only. 178 * (see also below; MNT_UPDATE is required.) 179 */ 180 if (securelevel >= 2 && 181 (SCARG(uap, flags) != 182 (mp->mnt_flag | MNT_RDONLY | 183 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 184 vput(vp); 185 return (EPERM); 186 } 187 mp->mnt_flag |= 188 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 189 /* 190 * Only root, or the user that did the original mount is 191 * permitted to update it. 192 */ 193 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 194 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 195 vput(vp); 196 return (error); 197 } 198 /* 199 * Do not allow NFS export by non-root users. For non-root 200 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 201 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 202 */ 203 if (p->p_ucred->cr_uid != 0) { 204 if (SCARG(uap, flags) & MNT_EXPORTED) { 205 vput(vp); 206 return (EPERM); 207 } 208 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 209 if (flag & MNT_NOEXEC) 210 SCARG(uap, flags) |= MNT_NOEXEC; 211 } 212 if (vfs_busy(mp, LK_NOWAIT, 0)) { 213 vput(vp); 214 return (EPERM); 215 } 216 VOP_UNLOCK(vp, 0); 217 goto update; 218 } else { 219 if (securelevel >= 2) { 220 vput(vp); 221 return (EPERM); 222 } 223 } 224 /* 225 * If the user is not root, ensure that they own the directory 226 * onto which we are attempting to mount. 227 */ 228 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 229 (va.va_uid != p->p_ucred->cr_uid && 230 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 231 vput(vp); 232 return (error); 233 } 234 /* 235 * Do not allow NFS export by non-root users. For non-root users, 236 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 237 * mount point is already MNT_NOEXEC. 238 */ 239 if (p->p_ucred->cr_uid != 0) { 240 if (SCARG(uap, flags) & MNT_EXPORTED) { 241 vput(vp); 242 return (EPERM); 243 } 244 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 245 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 246 SCARG(uap, flags) |= MNT_NOEXEC; 247 } 248 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 249 return (error); 250 if (vp->v_type != VDIR) { 251 vput(vp); 252 return (ENOTDIR); 253 } 254 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 255 if (error) { 256 #if defined(COMPAT_09) || defined(COMPAT_43) 257 /* 258 * Historically filesystem types were identified by number. 259 * If we get an integer for the filesystem type instead of a 260 * string, we check to see if it matches one of the historic 261 * filesystem types. 262 */ 263 u_long fsindex = (u_long)SCARG(uap, type); 264 if (fsindex >= nmountcompatnames || 265 mountcompatnames[fsindex] == NULL) { 266 vput(vp); 267 return (ENODEV); 268 } 269 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 270 #else 271 vput(vp); 272 return (error); 273 #endif 274 } 275 #ifdef COMPAT_10 276 /* Accept `ufs' as an alias for `ffs'. */ 277 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 278 strncpy(fstypename, "ffs", MFSNAMELEN); 279 #endif 280 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 281 vput(vp); 282 return (ENODEV); 283 } 284 if (vp->v_mountedhere != NULL) { 285 vput(vp); 286 return (EBUSY); 287 } 288 289 /* 290 * Allocate and initialize the file system. 291 */ 292 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 293 M_MOUNT, M_WAITOK); 294 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 295 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 296 (void)vfs_busy(mp, LK_NOWAIT, 0); 297 mp->mnt_op = vfs; 298 vfs->vfs_refcount++; 299 mp->mnt_vnodecovered = vp; 300 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 301 mp->mnt_unmounter = NULL; 302 update: 303 /* 304 * Set the mount level flags. 305 */ 306 if (SCARG(uap, flags) & MNT_RDONLY) 307 mp->mnt_flag |= MNT_RDONLY; 308 else if (mp->mnt_flag & MNT_RDONLY) 309 mp->mnt_flag |= MNT_WANTRDWR; 310 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 311 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 312 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 313 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 314 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 315 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 316 MNT_SOFTDEP); 317 /* 318 * Mount the filesystem. 319 */ 320 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 321 if (mp->mnt_flag & MNT_UPDATE) { 322 vrele(vp); 323 if (mp->mnt_flag & MNT_WANTRDWR) 324 mp->mnt_flag &= ~MNT_RDONLY; 325 mp->mnt_flag &=~ 326 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 327 if (error) 328 mp->mnt_flag = flag; 329 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 330 if (mp->mnt_syncer == NULL) 331 error = vfs_allocate_syncvnode(mp); 332 } else { 333 if (mp->mnt_syncer != NULL) 334 vfs_deallocate_syncvnode(mp); 335 } 336 vfs_unbusy(mp); 337 return (error); 338 } 339 /* 340 * Put the new filesystem on the mount list after root. 341 */ 342 cache_purge(vp); 343 if (!error) { 344 vp->v_mountedhere = mp; 345 simple_lock(&mountlist_slock); 346 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 347 simple_unlock(&mountlist_slock); 348 checkdirs(vp); 349 VOP_UNLOCK(vp, 0); 350 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 351 error = vfs_allocate_syncvnode(mp); 352 vfs_unbusy(mp); 353 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 354 if ((error = VFS_START(mp, 0, p))) 355 vrele(vp); 356 } else { 357 vp->v_mountedhere = (struct mount *)0; 358 vfs->vfs_refcount--; 359 vfs_unbusy(mp); 360 free((caddr_t)mp, M_MOUNT); 361 vput(vp); 362 } 363 return (error); 364 } 365 366 /* 367 * Scan all active processes to see if any of them have a current 368 * or root directory onto which the new filesystem has just been 369 * mounted. If so, replace them with the new mount point. 370 */ 371 void 372 checkdirs(olddp) 373 struct vnode *olddp; 374 { 375 struct cwdinfo *cwdi; 376 struct vnode *newdp; 377 struct proc *p; 378 379 if (olddp->v_usecount == 1) 380 return; 381 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 382 panic("mount: lost mount"); 383 proclist_lock_read(); 384 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 385 cwdi = p->p_cwdi; 386 if (cwdi->cwdi_cdir == olddp) { 387 vrele(cwdi->cwdi_cdir); 388 VREF(newdp); 389 cwdi->cwdi_cdir = newdp; 390 } 391 if (cwdi->cwdi_rdir == olddp) { 392 vrele(cwdi->cwdi_rdir); 393 VREF(newdp); 394 cwdi->cwdi_rdir = newdp; 395 } 396 } 397 proclist_unlock_read(); 398 if (rootvnode == olddp) { 399 vrele(rootvnode); 400 VREF(newdp); 401 rootvnode = newdp; 402 } 403 vput(newdp); 404 } 405 406 /* 407 * Unmount a file system. 408 * 409 * Note: unmount takes a path to the vnode mounted on as argument, 410 * not special file (as before). 411 */ 412 /* ARGSUSED */ 413 int 414 sys_unmount(p, v, retval) 415 struct proc *p; 416 void *v; 417 register_t *retval; 418 { 419 struct sys_unmount_args /* { 420 syscallarg(const char *) path; 421 syscallarg(int) flags; 422 } */ *uap = v; 423 struct vnode *vp; 424 struct mount *mp; 425 int error; 426 struct nameidata nd; 427 428 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 429 SCARG(uap, path), p); 430 if ((error = namei(&nd)) != 0) 431 return (error); 432 vp = nd.ni_vp; 433 mp = vp->v_mount; 434 435 /* 436 * Only root, or the user that did the original mount is 437 * permitted to unmount this filesystem. 438 */ 439 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 440 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 441 vput(vp); 442 return (error); 443 } 444 445 /* 446 * Don't allow unmounting the root file system. 447 */ 448 if (mp->mnt_flag & MNT_ROOTFS) { 449 vput(vp); 450 return (EINVAL); 451 } 452 453 /* 454 * Must be the root of the filesystem 455 */ 456 if ((vp->v_flag & VROOT) == 0) { 457 vput(vp); 458 return (EINVAL); 459 } 460 vput(vp); 461 462 /* 463 * XXX Freeze syncer. Must do this before locking the 464 * mount point. See dounmount() for details. 465 */ 466 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 467 468 if (vfs_busy(mp, 0, 0)) { 469 lockmgr(&syncer_lock, LK_RELEASE, NULL); 470 return (EBUSY); 471 } 472 473 return (dounmount(mp, SCARG(uap, flags), p)); 474 } 475 476 /* 477 * Do the actual file system unmount. File system is assumed to have been 478 * marked busy by the caller. 479 */ 480 int 481 dounmount(mp, flags, p) 482 struct mount *mp; 483 int flags; 484 struct proc *p; 485 { 486 struct vnode *coveredvp; 487 int error; 488 int async; 489 int used_syncer; 490 491 simple_lock(&mountlist_slock); 492 vfs_unbusy(mp); 493 used_syncer = (mp->mnt_syncer != NULL); 494 495 /* 496 * XXX Syncer must be frozen when we get here. This should really 497 * be done on a per-mountpoint basis, but especially the softdep 498 * code possibly called from the syncer doens't exactly work on a 499 * per-mountpoint basis, so the softdep code would become a maze 500 * of vfs_busy() calls. 501 * 502 * The caller of dounmount() must acquire syncer_lock because 503 * the syncer itself acquires locks in syncer_lock -> vfs_busy 504 * order, and we must preserve that order to avoid deadlock. 505 * 506 * So, if the file system did not use the syncer, now is 507 * the time to release the syncer_lock. 508 */ 509 if (used_syncer == 0) 510 lockmgr(&syncer_lock, LK_RELEASE, NULL); 511 512 mp->mnt_flag |= MNT_UNMOUNT; 513 mp->mnt_unmounter = p; 514 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 515 if (mp->mnt_flag & MNT_EXPUBLIC) 516 vfs_setpublicfs(NULL, NULL, NULL); 517 async = mp->mnt_flag & MNT_ASYNC; 518 mp->mnt_flag &= ~MNT_ASYNC; 519 cache_purgevfs(mp); /* remove cache entries for this file sys */ 520 if (mp->mnt_syncer != NULL) 521 vfs_deallocate_syncvnode(mp); 522 if (((mp->mnt_flag & MNT_RDONLY) || 523 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 524 (flags & MNT_FORCE)) 525 error = VFS_UNMOUNT(mp, flags, p); 526 simple_lock(&mountlist_slock); 527 if (error) { 528 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 529 (void) vfs_allocate_syncvnode(mp); 530 mp->mnt_flag &= ~MNT_UNMOUNT; 531 mp->mnt_unmounter = NULL; 532 mp->mnt_flag |= async; 533 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 534 &mountlist_slock); 535 if (used_syncer) 536 lockmgr(&syncer_lock, LK_RELEASE, NULL); 537 while (mp->mnt_wcnt > 0) { 538 wakeup((caddr_t)mp); 539 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 540 } 541 return (error); 542 } 543 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 544 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 545 coveredvp->v_mountedhere = NULL; 546 vrele(coveredvp); 547 } 548 mp->mnt_op->vfs_refcount--; 549 if (mp->mnt_vnodelist.lh_first != NULL) 550 panic("unmount: dangling vnode"); 551 mp->mnt_flag |= MNT_GONE; 552 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 553 if (used_syncer) 554 lockmgr(&syncer_lock, LK_RELEASE, NULL); 555 while(mp->mnt_wcnt > 0) { 556 wakeup((caddr_t)mp); 557 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 558 } 559 free((caddr_t)mp, M_MOUNT); 560 return (0); 561 } 562 563 /* 564 * Sync each mounted filesystem. 565 */ 566 #ifdef DEBUG 567 int syncprt = 0; 568 struct ctldebug debug0 = { "syncprt", &syncprt }; 569 #endif 570 571 /* ARGSUSED */ 572 int 573 sys_sync(p, v, retval) 574 struct proc *p; 575 void *v; 576 register_t *retval; 577 { 578 struct mount *mp, *nmp; 579 int asyncflag; 580 581 simple_lock(&mountlist_slock); 582 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 583 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 584 nmp = mp->mnt_list.cqe_prev; 585 continue; 586 } 587 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 588 asyncflag = mp->mnt_flag & MNT_ASYNC; 589 mp->mnt_flag &= ~MNT_ASYNC; 590 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 591 if (asyncflag) 592 mp->mnt_flag |= MNT_ASYNC; 593 } 594 simple_lock(&mountlist_slock); 595 nmp = mp->mnt_list.cqe_prev; 596 vfs_unbusy(mp); 597 598 } 599 simple_unlock(&mountlist_slock); 600 #ifdef DEBUG 601 if (syncprt) 602 vfs_bufstats(); 603 #endif /* DEBUG */ 604 return (0); 605 } 606 607 /* 608 * Change filesystem quotas. 609 */ 610 /* ARGSUSED */ 611 int 612 sys_quotactl(p, v, retval) 613 struct proc *p; 614 void *v; 615 register_t *retval; 616 { 617 struct sys_quotactl_args /* { 618 syscallarg(const char *) path; 619 syscallarg(int) cmd; 620 syscallarg(int) uid; 621 syscallarg(caddr_t) arg; 622 } */ *uap = v; 623 struct mount *mp; 624 int error; 625 struct nameidata nd; 626 627 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 628 if ((error = namei(&nd)) != 0) 629 return (error); 630 mp = nd.ni_vp->v_mount; 631 vrele(nd.ni_vp); 632 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 633 SCARG(uap, arg), p)); 634 } 635 636 /* 637 * Get filesystem statistics. 638 */ 639 /* ARGSUSED */ 640 int 641 sys_statfs(p, v, retval) 642 struct proc *p; 643 void *v; 644 register_t *retval; 645 { 646 struct sys_statfs_args /* { 647 syscallarg(const char *) path; 648 syscallarg(struct statfs *) buf; 649 } */ *uap = v; 650 struct mount *mp; 651 struct statfs *sp; 652 int error; 653 struct nameidata nd; 654 655 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 656 if ((error = namei(&nd)) != 0) 657 return (error); 658 mp = nd.ni_vp->v_mount; 659 sp = &mp->mnt_stat; 660 vrele(nd.ni_vp); 661 if ((error = VFS_STATFS(mp, sp, p)) != 0) 662 return (error); 663 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 664 sp->f_oflags = sp->f_flags & 0xffff; 665 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 666 } 667 668 /* 669 * Get filesystem statistics. 670 */ 671 /* ARGSUSED */ 672 int 673 sys_fstatfs(p, v, retval) 674 struct proc *p; 675 void *v; 676 register_t *retval; 677 { 678 struct sys_fstatfs_args /* { 679 syscallarg(int) fd; 680 syscallarg(struct statfs *) buf; 681 } */ *uap = v; 682 struct file *fp; 683 struct mount *mp; 684 struct statfs *sp; 685 int error; 686 687 /* getvnode() will use the descriptor for us */ 688 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 689 return (error); 690 mp = ((struct vnode *)fp->f_data)->v_mount; 691 sp = &mp->mnt_stat; 692 if ((error = VFS_STATFS(mp, sp, p)) != 0) 693 goto out; 694 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 695 sp->f_oflags = sp->f_flags & 0xffff; 696 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 697 out: 698 FILE_UNUSE(fp, p); 699 return (error); 700 } 701 702 /* 703 * Get statistics on all filesystems. 704 */ 705 int 706 sys_getfsstat(p, v, retval) 707 struct proc *p; 708 void *v; 709 register_t *retval; 710 { 711 struct sys_getfsstat_args /* { 712 syscallarg(struct statfs *) buf; 713 syscallarg(long) bufsize; 714 syscallarg(int) flags; 715 } */ *uap = v; 716 struct mount *mp, *nmp; 717 struct statfs *sp; 718 caddr_t sfsp; 719 long count, maxcount, error; 720 721 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 722 sfsp = (caddr_t)SCARG(uap, buf); 723 simple_lock(&mountlist_slock); 724 count = 0; 725 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 726 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 727 nmp = mp->mnt_list.cqe_next; 728 continue; 729 } 730 if (sfsp && count < maxcount) { 731 sp = &mp->mnt_stat; 732 /* 733 * If MNT_NOWAIT or MNT_LAZY is specified, do not 734 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 735 * overrides MNT_NOWAIT. 736 */ 737 if (SCARG(uap, flags) != MNT_NOWAIT && 738 SCARG(uap, flags) != MNT_LAZY && 739 (SCARG(uap, flags) == MNT_WAIT || 740 SCARG(uap, flags) == 0) && 741 (error = VFS_STATFS(mp, sp, p)) != 0) { 742 simple_lock(&mountlist_slock); 743 nmp = mp->mnt_list.cqe_next; 744 vfs_unbusy(mp); 745 continue; 746 } 747 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 748 sp->f_oflags = sp->f_flags & 0xffff; 749 error = copyout(sp, sfsp, sizeof(*sp)); 750 if (error) { 751 vfs_unbusy(mp); 752 return (error); 753 } 754 sfsp += sizeof(*sp); 755 } 756 count++; 757 simple_lock(&mountlist_slock); 758 nmp = mp->mnt_list.cqe_next; 759 vfs_unbusy(mp); 760 } 761 simple_unlock(&mountlist_slock); 762 if (sfsp && count > maxcount) 763 *retval = maxcount; 764 else 765 *retval = count; 766 return (0); 767 } 768 769 /* 770 * Change current working directory to a given file descriptor. 771 */ 772 /* ARGSUSED */ 773 int 774 sys_fchdir(p, v, retval) 775 struct proc *p; 776 void *v; 777 register_t *retval; 778 { 779 struct sys_fchdir_args /* { 780 syscallarg(int) fd; 781 } */ *uap = v; 782 struct filedesc *fdp = p->p_fd; 783 struct cwdinfo *cwdi = p->p_cwdi; 784 struct vnode *vp, *tdp; 785 struct mount *mp; 786 struct file *fp; 787 int error; 788 789 /* getvnode() will use the descriptor for us */ 790 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 791 return (error); 792 vp = (struct vnode *)fp->f_data; 793 794 VREF(vp); 795 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 796 if (vp->v_type != VDIR) 797 error = ENOTDIR; 798 else 799 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 800 while (!error && (mp = vp->v_mountedhere) != NULL) { 801 if (vfs_busy(mp, 0, 0)) 802 continue; 803 error = VFS_ROOT(mp, &tdp); 804 vfs_unbusy(mp); 805 if (error) 806 break; 807 vput(vp); 808 vp = tdp; 809 } 810 if (error) { 811 vput(vp); 812 goto out; 813 } 814 VOP_UNLOCK(vp, 0); 815 816 /* 817 * Disallow changing to a directory not under the process's 818 * current root directory (if there is one). 819 */ 820 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 821 vrele(vp); 822 error = EPERM; /* operation not permitted */ 823 goto out; 824 } 825 826 vrele(cwdi->cwdi_cdir); 827 cwdi->cwdi_cdir = vp; 828 out: 829 FILE_UNUSE(fp, p); 830 return (error); 831 } 832 833 /* 834 * Change this process's notion of the root directory to a given file descriptor. 835 */ 836 837 int 838 sys_fchroot(p, v, retval) 839 struct proc *p; 840 void *v; 841 register_t *retval; 842 { 843 struct sys_fchroot_args *uap = v; 844 struct filedesc *fdp = p->p_fd; 845 struct cwdinfo *cwdi = p->p_cwdi; 846 struct vnode *vp; 847 struct file *fp; 848 int error; 849 850 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 851 return error; 852 /* getvnode() will use the descriptor for us */ 853 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 854 return error; 855 vp = (struct vnode *) fp->f_data; 856 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 857 if (vp->v_type != VDIR) 858 error = ENOTDIR; 859 else 860 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 861 VOP_UNLOCK(vp, 0); 862 if (error) 863 goto out; 864 VREF(vp); 865 866 /* 867 * Prevent escaping from chroot by putting the root under 868 * the working directory. Silently chdir to / if we aren't 869 * already there. 870 */ 871 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 872 /* 873 * XXX would be more failsafe to change directory to a 874 * deadfs node here instead 875 */ 876 vrele(cwdi->cwdi_cdir); 877 VREF(vp); 878 cwdi->cwdi_cdir = vp; 879 } 880 881 if (cwdi->cwdi_rdir != NULL) 882 vrele(cwdi->cwdi_rdir); 883 cwdi->cwdi_rdir = vp; 884 out: 885 FILE_UNUSE(fp, p); 886 return (error); 887 } 888 889 890 891 /* 892 * Change current working directory (``.''). 893 */ 894 /* ARGSUSED */ 895 int 896 sys_chdir(p, v, retval) 897 struct proc *p; 898 void *v; 899 register_t *retval; 900 { 901 struct sys_chdir_args /* { 902 syscallarg(const char *) path; 903 } */ *uap = v; 904 struct cwdinfo *cwdi = p->p_cwdi; 905 int error; 906 struct nameidata nd; 907 908 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 909 SCARG(uap, path), p); 910 if ((error = change_dir(&nd, p)) != 0) 911 return (error); 912 vrele(cwdi->cwdi_cdir); 913 cwdi->cwdi_cdir = nd.ni_vp; 914 return (0); 915 } 916 917 /* 918 * Change notion of root (``/'') directory. 919 */ 920 /* ARGSUSED */ 921 int 922 sys_chroot(p, v, retval) 923 struct proc *p; 924 void *v; 925 register_t *retval; 926 { 927 struct sys_chroot_args /* { 928 syscallarg(const char *) path; 929 } */ *uap = v; 930 struct cwdinfo *cwdi = p->p_cwdi; 931 struct vnode *vp; 932 int error; 933 struct nameidata nd; 934 935 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 936 return (error); 937 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 938 SCARG(uap, path), p); 939 if ((error = change_dir(&nd, p)) != 0) 940 return (error); 941 if (cwdi->cwdi_rdir != NULL) 942 vrele(cwdi->cwdi_rdir); 943 vp = nd.ni_vp; 944 cwdi->cwdi_rdir = vp; 945 946 /* 947 * Prevent escaping from chroot by putting the root under 948 * the working directory. Silently chdir to / if we aren't 949 * already there. 950 */ 951 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 952 /* 953 * XXX would be more failsafe to change directory to a 954 * deadfs node here instead 955 */ 956 vrele(cwdi->cwdi_cdir); 957 VREF(vp); 958 cwdi->cwdi_cdir = vp; 959 } 960 961 return (0); 962 } 963 964 /* 965 * Common routine for chroot and chdir. 966 */ 967 static int 968 change_dir(ndp, p) 969 struct nameidata *ndp; 970 struct proc *p; 971 { 972 struct vnode *vp; 973 int error; 974 975 if ((error = namei(ndp)) != 0) 976 return (error); 977 vp = ndp->ni_vp; 978 if (vp->v_type != VDIR) 979 error = ENOTDIR; 980 else 981 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 982 983 if (error) 984 vput(vp); 985 else 986 VOP_UNLOCK(vp, 0); 987 return (error); 988 } 989 990 /* 991 * Check permissions, allocate an open file structure, 992 * and call the device open routine if any. 993 */ 994 int 995 sys_open(p, v, retval) 996 struct proc *p; 997 void *v; 998 register_t *retval; 999 { 1000 struct sys_open_args /* { 1001 syscallarg(const char *) path; 1002 syscallarg(int) flags; 1003 syscallarg(int) mode; 1004 } */ *uap = v; 1005 struct cwdinfo *cwdi = p->p_cwdi; 1006 struct filedesc *fdp = p->p_fd; 1007 struct file *fp; 1008 struct vnode *vp; 1009 int flags, cmode; 1010 int type, indx, error; 1011 struct flock lf; 1012 struct nameidata nd; 1013 1014 flags = FFLAGS(SCARG(uap, flags)); 1015 if ((flags & (FREAD | FWRITE)) == 0) 1016 return (EINVAL); 1017 /* falloc() will use the file descriptor for us */ 1018 if ((error = falloc(p, &fp, &indx)) != 0) 1019 return (error); 1020 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1021 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1022 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1023 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1024 FILE_UNUSE(fp, p); 1025 ffree(fp); 1026 if ((error == ENODEV || error == ENXIO) && 1027 p->p_dupfd >= 0 && /* XXX from fdopen */ 1028 (error = 1029 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1030 *retval = indx; 1031 return (0); 1032 } 1033 if (error == ERESTART) 1034 error = EINTR; 1035 fdremove(fdp, indx); 1036 return (error); 1037 } 1038 p->p_dupfd = 0; 1039 vp = nd.ni_vp; 1040 fp->f_flag = flags & FMASK; 1041 fp->f_type = DTYPE_VNODE; 1042 fp->f_ops = &vnops; 1043 fp->f_data = (caddr_t)vp; 1044 if (flags & (O_EXLOCK | O_SHLOCK)) { 1045 lf.l_whence = SEEK_SET; 1046 lf.l_start = 0; 1047 lf.l_len = 0; 1048 if (flags & O_EXLOCK) 1049 lf.l_type = F_WRLCK; 1050 else 1051 lf.l_type = F_RDLCK; 1052 type = F_FLOCK; 1053 if ((flags & FNONBLOCK) == 0) 1054 type |= F_WAIT; 1055 VOP_UNLOCK(vp, 0); 1056 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1057 if (error) { 1058 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1059 FILE_UNUSE(fp, p); 1060 ffree(fp); 1061 fdremove(fdp, indx); 1062 return (error); 1063 } 1064 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1065 fp->f_flag |= FHASLOCK; 1066 } 1067 VOP_UNLOCK(vp, 0); 1068 *retval = indx; 1069 FILE_UNUSE(fp, p); 1070 return (0); 1071 } 1072 1073 /* 1074 * Get file handle system call 1075 */ 1076 int 1077 sys_getfh(p, v, retval) 1078 struct proc *p; 1079 void *v; 1080 register_t *retval; 1081 { 1082 struct sys_getfh_args /* { 1083 syscallarg(char *) fname; 1084 syscallarg(fhandle_t *) fhp; 1085 } */ *uap = v; 1086 struct vnode *vp; 1087 fhandle_t fh; 1088 int error; 1089 struct nameidata nd; 1090 1091 /* 1092 * Must be super user 1093 */ 1094 error = suser(p->p_ucred, &p->p_acflag); 1095 if (error) 1096 return (error); 1097 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1098 SCARG(uap, fname), p); 1099 error = namei(&nd); 1100 if (error) 1101 return (error); 1102 vp = nd.ni_vp; 1103 memset((caddr_t)&fh, 0, sizeof(fh)); 1104 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1105 error = VFS_VPTOFH(vp, &fh.fh_fid); 1106 vput(vp); 1107 if (error) 1108 return (error); 1109 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1110 return (error); 1111 } 1112 1113 /* 1114 * Open a file given a file handle. 1115 * 1116 * Check permissions, allocate an open file structure, 1117 * and call the device open routine if any. 1118 */ 1119 int 1120 sys_fhopen(p, v, retval) 1121 struct proc *p; 1122 void *v; 1123 register_t *retval; 1124 { 1125 struct sys_fhopen_args /* { 1126 syscallarg(const fhandle_t *) fhp; 1127 syscallarg(int) flags; 1128 } */ *uap = v; 1129 struct filedesc *fdp = p->p_fd; 1130 struct file *fp; 1131 struct vnode *vp = NULL; 1132 struct mount *mp; 1133 struct ucred *cred = p->p_ucred; 1134 int flags; 1135 struct file *nfp; 1136 int type, indx, error=0; 1137 struct flock lf; 1138 struct vattr va; 1139 fhandle_t fh; 1140 1141 /* 1142 * Must be super user 1143 */ 1144 if ((error = suser(p->p_ucred, &p->p_acflag))) 1145 return (error); 1146 1147 flags = FFLAGS(SCARG(uap, flags)); 1148 if ((flags & (FREAD | FWRITE)) == 0) 1149 return (EINVAL); 1150 if ((flags & O_CREAT)) 1151 return (EINVAL); 1152 /* falloc() will use the file descriptor for us */ 1153 if ((error = falloc(p, &nfp, &indx)) != 0) 1154 return (error); 1155 fp = nfp; 1156 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1157 goto bad; 1158 1159 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1160 error = ESTALE; 1161 goto bad; 1162 } 1163 1164 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1165 vp = NULL; /* most likely unnecessary sanity for bad: */ 1166 goto bad; 1167 } 1168 1169 /* Now do an effective vn_open */ 1170 1171 if (vp->v_type == VSOCK) { 1172 error = EOPNOTSUPP; 1173 goto bad; 1174 } 1175 if (flags & FREAD) { 1176 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1177 goto bad; 1178 } 1179 if (flags & (FWRITE | O_TRUNC)) { 1180 if (vp->v_type == VDIR) { 1181 error = EISDIR; 1182 goto bad; 1183 } 1184 if ((error = vn_writechk(vp)) != 0 || 1185 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1186 goto bad; 1187 } 1188 if (flags & O_TRUNC) { 1189 VOP_UNLOCK(vp, 0); /* XXX */ 1190 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1191 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1192 VATTR_NULL(&va); 1193 va.va_size = 0; 1194 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1195 goto bad; 1196 } 1197 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1198 goto bad; 1199 if (vp->v_type == VREG && 1200 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1201 error = EIO; 1202 goto bad; 1203 } 1204 if (flags & FWRITE) 1205 vp->v_writecount++; 1206 1207 /* done with modified vn_open, now finish what sys_open does. */ 1208 1209 fp->f_flag = flags & FMASK; 1210 fp->f_type = DTYPE_VNODE; 1211 fp->f_ops = &vnops; 1212 fp->f_data = (caddr_t)vp; 1213 if (flags & (O_EXLOCK | O_SHLOCK)) { 1214 lf.l_whence = SEEK_SET; 1215 lf.l_start = 0; 1216 lf.l_len = 0; 1217 if (flags & O_EXLOCK) 1218 lf.l_type = F_WRLCK; 1219 else 1220 lf.l_type = F_RDLCK; 1221 type = F_FLOCK; 1222 if ((flags & FNONBLOCK) == 0) 1223 type |= F_WAIT; 1224 VOP_UNLOCK(vp, 0); 1225 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1226 if (error) { 1227 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1228 FILE_UNUSE(fp, p); 1229 ffree(fp); 1230 fdremove(fdp, indx); 1231 return (error); 1232 } 1233 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1234 fp->f_flag |= FHASLOCK; 1235 } 1236 VOP_UNLOCK(vp, 0); 1237 *retval = indx; 1238 FILE_UNUSE(fp, p); 1239 return (0); 1240 1241 bad: 1242 FILE_UNUSE(fp, p); 1243 ffree(fp); 1244 fdremove(fdp, indx); 1245 if (vp != NULL) 1246 vput(vp); 1247 return (error); 1248 } 1249 1250 /* ARGSUSED */ 1251 int 1252 sys_fhstat(p, v, retval) 1253 struct proc *p; 1254 void *v; 1255 register_t *retval; 1256 { 1257 struct sys_fhstat_args /* { 1258 syscallarg(const fhandle_t *) fhp; 1259 syscallarg(struct stat *) sb; 1260 } */ *uap = v; 1261 struct stat sb; 1262 int error; 1263 fhandle_t fh; 1264 struct mount *mp; 1265 struct vnode *vp; 1266 1267 /* 1268 * Must be super user 1269 */ 1270 if ((error = suser(p->p_ucred, &p->p_acflag))) 1271 return (error); 1272 1273 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1274 return (error); 1275 1276 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1277 return (ESTALE); 1278 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1279 return (error); 1280 error = vn_stat(vp, &sb, p); 1281 vput(vp); 1282 if (error) 1283 return (error); 1284 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1285 return (error); 1286 } 1287 1288 /* ARGSUSED */ 1289 int 1290 sys_fhstatfs(p, v, retval) 1291 struct proc *p; 1292 void *v; 1293 register_t *retval; 1294 { 1295 struct sys_fhstatfs_args /* 1296 syscallarg(const fhandle_t *) fhp; 1297 syscallarg(struct statfs *) buf; 1298 } */ *uap = v; 1299 struct statfs sp; 1300 fhandle_t fh; 1301 struct mount *mp; 1302 struct vnode *vp; 1303 int error; 1304 1305 /* 1306 * Must be super user 1307 */ 1308 if ((error = suser(p->p_ucred, &p->p_acflag))) 1309 return (error); 1310 1311 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1312 return (error); 1313 1314 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1315 return (ESTALE); 1316 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1317 return (error); 1318 mp = vp->v_mount; 1319 vput(vp); 1320 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1321 return (error); 1322 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1323 sp.f_oflags = sp.f_flags & 0xffff; 1324 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1325 } 1326 1327 /* 1328 * Create a special file. 1329 */ 1330 /* ARGSUSED */ 1331 int 1332 sys_mknod(p, v, retval) 1333 struct proc *p; 1334 void *v; 1335 register_t *retval; 1336 { 1337 struct sys_mknod_args /* { 1338 syscallarg(const char *) path; 1339 syscallarg(int) mode; 1340 syscallarg(int) dev; 1341 } */ *uap = v; 1342 struct vnode *vp; 1343 struct vattr vattr; 1344 int error; 1345 int whiteout = 0; 1346 struct nameidata nd; 1347 1348 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1349 return (error); 1350 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1351 if ((error = namei(&nd)) != 0) 1352 return (error); 1353 vp = nd.ni_vp; 1354 if (vp != NULL) 1355 error = EEXIST; 1356 else { 1357 VATTR_NULL(&vattr); 1358 vattr.va_mode = 1359 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1360 vattr.va_rdev = SCARG(uap, dev); 1361 whiteout = 0; 1362 1363 switch (SCARG(uap, mode) & S_IFMT) { 1364 case S_IFMT: /* used by badsect to flag bad sectors */ 1365 vattr.va_type = VBAD; 1366 break; 1367 case S_IFCHR: 1368 vattr.va_type = VCHR; 1369 break; 1370 case S_IFBLK: 1371 vattr.va_type = VBLK; 1372 break; 1373 case S_IFWHT: 1374 whiteout = 1; 1375 break; 1376 default: 1377 error = EINVAL; 1378 break; 1379 } 1380 } 1381 if (!error) { 1382 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1383 if (whiteout) { 1384 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1385 if (error) 1386 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1387 vput(nd.ni_dvp); 1388 } else { 1389 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1390 &nd.ni_cnd, &vattr); 1391 } 1392 } else { 1393 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1394 if (nd.ni_dvp == vp) 1395 vrele(nd.ni_dvp); 1396 else 1397 vput(nd.ni_dvp); 1398 if (vp) 1399 vrele(vp); 1400 } 1401 return (error); 1402 } 1403 1404 /* 1405 * Create a named pipe. 1406 */ 1407 /* ARGSUSED */ 1408 int 1409 sys_mkfifo(p, v, retval) 1410 struct proc *p; 1411 void *v; 1412 register_t *retval; 1413 { 1414 struct sys_mkfifo_args /* { 1415 syscallarg(const char *) path; 1416 syscallarg(int) mode; 1417 } */ *uap = v; 1418 struct vattr vattr; 1419 int error; 1420 struct nameidata nd; 1421 1422 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1423 if ((error = namei(&nd)) != 0) 1424 return (error); 1425 if (nd.ni_vp != NULL) { 1426 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1427 if (nd.ni_dvp == nd.ni_vp) 1428 vrele(nd.ni_dvp); 1429 else 1430 vput(nd.ni_dvp); 1431 vrele(nd.ni_vp); 1432 return (EEXIST); 1433 } 1434 VATTR_NULL(&vattr); 1435 vattr.va_type = VFIFO; 1436 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1437 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1438 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1439 } 1440 1441 /* 1442 * Make a hard file link. 1443 */ 1444 /* ARGSUSED */ 1445 int 1446 sys_link(p, v, retval) 1447 struct proc *p; 1448 void *v; 1449 register_t *retval; 1450 { 1451 struct sys_link_args /* { 1452 syscallarg(const char *) path; 1453 syscallarg(const char *) link; 1454 } */ *uap = v; 1455 struct vnode *vp; 1456 struct nameidata nd; 1457 int error; 1458 1459 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1460 if ((error = namei(&nd)) != 0) 1461 return (error); 1462 vp = nd.ni_vp; 1463 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1464 if ((error = namei(&nd)) != 0) 1465 goto out; 1466 if (nd.ni_vp) { 1467 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1468 if (nd.ni_dvp == nd.ni_vp) 1469 vrele(nd.ni_dvp); 1470 else 1471 vput(nd.ni_dvp); 1472 vrele(nd.ni_vp); 1473 error = EEXIST; 1474 goto out; 1475 } 1476 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1477 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1478 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1479 out: 1480 vrele(vp); 1481 return (error); 1482 } 1483 1484 /* 1485 * Make a symbolic link. 1486 */ 1487 /* ARGSUSED */ 1488 int 1489 sys_symlink(p, v, retval) 1490 struct proc *p; 1491 void *v; 1492 register_t *retval; 1493 { 1494 struct sys_symlink_args /* { 1495 syscallarg(const char *) path; 1496 syscallarg(const char *) link; 1497 } */ *uap = v; 1498 struct vattr vattr; 1499 char *path; 1500 int error; 1501 struct nameidata nd; 1502 1503 path = PNBUF_GET(); 1504 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1505 if (error) 1506 goto out; 1507 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1508 if ((error = namei(&nd)) != 0) 1509 goto out; 1510 if (nd.ni_vp) { 1511 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1512 if (nd.ni_dvp == nd.ni_vp) 1513 vrele(nd.ni_dvp); 1514 else 1515 vput(nd.ni_dvp); 1516 vrele(nd.ni_vp); 1517 error = EEXIST; 1518 goto out; 1519 } 1520 VATTR_NULL(&vattr); 1521 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1522 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1523 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 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 ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1637 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1638 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1639 return (EBADF); 1640 1641 FILE_USE(fp); 1642 1643 vp = (struct vnode *)fp->f_data; 1644 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1645 error = ESPIPE; 1646 goto out; 1647 } 1648 1649 switch (SCARG(uap, whence)) { 1650 case SEEK_CUR: 1651 newoff = fp->f_offset + SCARG(uap, offset); 1652 break; 1653 case SEEK_END: 1654 error = VOP_GETATTR(vp, &vattr, cred, p); 1655 if (error) 1656 goto out; 1657 newoff = SCARG(uap, offset) + vattr.va_size; 1658 break; 1659 case SEEK_SET: 1660 newoff = SCARG(uap, offset); 1661 break; 1662 default: 1663 error = EINVAL; 1664 goto out; 1665 } 1666 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1667 goto out; 1668 1669 *(off_t *)retval = fp->f_offset = newoff; 1670 out: 1671 FILE_UNUSE(fp, p); 1672 return (error); 1673 } 1674 1675 /* 1676 * Positional read system call. 1677 */ 1678 int 1679 sys_pread(p, v, retval) 1680 struct proc *p; 1681 void *v; 1682 register_t *retval; 1683 { 1684 struct sys_pread_args /* { 1685 syscallarg(int) fd; 1686 syscallarg(void *) buf; 1687 syscallarg(size_t) nbyte; 1688 syscallarg(off_t) offset; 1689 } */ *uap = v; 1690 struct filedesc *fdp = p->p_fd; 1691 struct file *fp; 1692 struct vnode *vp; 1693 off_t offset; 1694 int error, fd = SCARG(uap, fd); 1695 1696 if ((u_int)fd >= fdp->fd_nfiles || 1697 (fp = fdp->fd_ofiles[fd]) == NULL || 1698 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1699 (fp->f_flag & FREAD) == 0) 1700 return (EBADF); 1701 1702 FILE_USE(fp); 1703 1704 vp = (struct vnode *)fp->f_data; 1705 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1706 error = ESPIPE; 1707 goto out; 1708 } 1709 1710 offset = SCARG(uap, offset); 1711 1712 /* 1713 * XXX This works because no file systems actually 1714 * XXX take any action on the seek operation. 1715 */ 1716 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1717 goto out; 1718 1719 /* dofileread() will unuse the descriptor for us */ 1720 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1721 &offset, 0, retval)); 1722 1723 out: 1724 FILE_UNUSE(fp, p); 1725 return (error); 1726 } 1727 1728 /* 1729 * Positional scatter read system call. 1730 */ 1731 int 1732 sys_preadv(p, v, retval) 1733 struct proc *p; 1734 void *v; 1735 register_t *retval; 1736 { 1737 struct sys_preadv_args /* { 1738 syscallarg(int) fd; 1739 syscallarg(const struct iovec *) iovp; 1740 syscallarg(int) iovcnt; 1741 syscallarg(off_t) offset; 1742 } */ *uap = v; 1743 struct filedesc *fdp = p->p_fd; 1744 struct file *fp; 1745 struct vnode *vp; 1746 off_t offset; 1747 int error, fd = SCARG(uap, fd); 1748 1749 if ((u_int)fd >= fdp->fd_nfiles || 1750 (fp = fdp->fd_ofiles[fd]) == NULL || 1751 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1752 (fp->f_flag & FREAD) == 0) 1753 return (EBADF); 1754 1755 FILE_USE(fp); 1756 1757 vp = (struct vnode *)fp->f_data; 1758 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1759 error = ESPIPE; 1760 goto out; 1761 } 1762 1763 offset = SCARG(uap, offset); 1764 1765 /* 1766 * XXX This works because no file systems actually 1767 * XXX take any action on the seek operation. 1768 */ 1769 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1770 goto out; 1771 1772 /* dofilereadv() will unuse the descriptor for us */ 1773 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1774 &offset, 0, retval)); 1775 1776 out: 1777 FILE_UNUSE(fp, p); 1778 return (error); 1779 } 1780 1781 /* 1782 * Positional write system call. 1783 */ 1784 int 1785 sys_pwrite(p, v, retval) 1786 struct proc *p; 1787 void *v; 1788 register_t *retval; 1789 { 1790 struct sys_pwrite_args /* { 1791 syscallarg(int) fd; 1792 syscallarg(const void *) buf; 1793 syscallarg(size_t) nbyte; 1794 syscallarg(off_t) offset; 1795 } */ *uap = v; 1796 struct filedesc *fdp = p->p_fd; 1797 struct file *fp; 1798 struct vnode *vp; 1799 off_t offset; 1800 int error, fd = SCARG(uap, fd); 1801 1802 if ((u_int)fd >= fdp->fd_nfiles || 1803 (fp = fdp->fd_ofiles[fd]) == NULL || 1804 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1805 (fp->f_flag & FWRITE) == 0) 1806 return (EBADF); 1807 1808 FILE_USE(fp); 1809 1810 vp = (struct vnode *)fp->f_data; 1811 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1812 error = ESPIPE; 1813 goto out; 1814 } 1815 1816 offset = SCARG(uap, offset); 1817 1818 /* 1819 * XXX This works because no file systems actually 1820 * XXX take any action on the seek operation. 1821 */ 1822 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1823 goto out; 1824 1825 /* dofilewrite() will unuse the descriptor for us */ 1826 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1827 &offset, 0, retval)); 1828 1829 out: 1830 FILE_UNUSE(fp, p); 1831 return (error); 1832 } 1833 1834 /* 1835 * Positional gather write system call. 1836 */ 1837 int 1838 sys_pwritev(p, v, retval) 1839 struct proc *p; 1840 void *v; 1841 register_t *retval; 1842 { 1843 struct sys_pwritev_args /* { 1844 syscallarg(int) fd; 1845 syscallarg(const struct iovec *) iovp; 1846 syscallarg(int) iovcnt; 1847 syscallarg(off_t) offset; 1848 } */ *uap = v; 1849 struct filedesc *fdp = p->p_fd; 1850 struct file *fp; 1851 struct vnode *vp; 1852 off_t offset; 1853 int error, fd = SCARG(uap, fd); 1854 1855 if ((u_int)fd >= fdp->fd_nfiles || 1856 (fp = fdp->fd_ofiles[fd]) == NULL || 1857 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1858 (fp->f_flag & FWRITE) == 0) 1859 return (EBADF); 1860 1861 FILE_USE(fp); 1862 1863 vp = (struct vnode *)fp->f_data; 1864 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1865 error = ESPIPE; 1866 goto out; 1867 } 1868 1869 offset = SCARG(uap, offset); 1870 1871 /* 1872 * XXX This works because no file systems actually 1873 * XXX take any action on the seek operation. 1874 */ 1875 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1876 goto out; 1877 1878 /* dofilewritev() will unuse the descriptor for us */ 1879 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1880 &offset, 0, retval)); 1881 1882 out: 1883 FILE_UNUSE(fp, p); 1884 return (error); 1885 } 1886 1887 /* 1888 * Check access permissions. 1889 */ 1890 int 1891 sys_access(p, v, retval) 1892 struct proc *p; 1893 void *v; 1894 register_t *retval; 1895 { 1896 struct sys_access_args /* { 1897 syscallarg(const char *) path; 1898 syscallarg(int) flags; 1899 } */ *uap = v; 1900 struct ucred *cred = p->p_ucred; 1901 struct vnode *vp; 1902 int error, flags, t_gid, t_uid; 1903 struct nameidata nd; 1904 1905 t_uid = cred->cr_uid; 1906 t_gid = cred->cr_gid; 1907 cred->cr_uid = p->p_cred->p_ruid; 1908 cred->cr_gid = p->p_cred->p_rgid; 1909 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1910 SCARG(uap, path), p); 1911 if ((error = namei(&nd)) != 0) 1912 goto out1; 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 out1: 1931 cred->cr_uid = t_uid; 1932 cred->cr_gid = t_gid; 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) ((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 : VNOVAL; 2502 vattr.va_gid = CHANGED(gid) ? gid : 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 ((u_int)fd >= fdp->fd_nfiles || 3095 (fp = fdp->fd_ofiles[fd]) == NULL || 3096 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3097 return (EBADF); 3098 3099 FILE_USE(fp); 3100 3101 if (fp->f_type != DTYPE_VNODE) { 3102 FILE_UNUSE(fp, NULL); 3103 return (EINVAL); 3104 } 3105 3106 vp = (struct vnode *)fp->f_data; 3107 if (vp->v_type == VBAD) { 3108 FILE_UNUSE(fp, NULL); 3109 return (EBADF); 3110 } 3111 3112 *fpp = fp; 3113 return (0); 3114 } 3115
Indexes created Thu Sep 25 14:09:45 GMT 2025