vfs_syscalls.c revision 1.168
1 /* $NetBSD: vfs_syscalls.c,v 1.168 2001/07/24 15:39:31 assar 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 #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 VOP_UNLOCK(vp, 0); 208 goto update; 209 } else { 210 if (securelevel >= 2) { 211 vput(vp); 212 return (EPERM); 213 } 214 } 215 /* 216 * If the user is not root, ensure that they own the directory 217 * onto which we are attempting to mount. 218 */ 219 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 220 (va.va_uid != p->p_ucred->cr_uid && 221 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 222 vput(vp); 223 return (error); 224 } 225 /* 226 * Do not allow NFS export by non-root users. For non-root users, 227 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 228 * mount point is already MNT_NOEXEC. 229 */ 230 if (p->p_ucred->cr_uid != 0) { 231 if (SCARG(uap, flags) & MNT_EXPORTED) { 232 vput(vp); 233 return (EPERM); 234 } 235 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 236 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 237 SCARG(uap, flags) |= MNT_NOEXEC; 238 } 239 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 240 return (error); 241 if (vp->v_type != VDIR) { 242 vput(vp); 243 return (ENOTDIR); 244 } 245 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 246 if (error) { 247 #if defined(COMPAT_09) || defined(COMPAT_43) 248 /* 249 * Historically filesystem types were identified by number. 250 * If we get an integer for the filesystem type instead of a 251 * string, we check to see if it matches one of the historic 252 * filesystem types. 253 */ 254 u_long fsindex = (u_long)SCARG(uap, type); 255 if (fsindex >= nmountcompatnames || 256 mountcompatnames[fsindex] == NULL) { 257 vput(vp); 258 return (ENODEV); 259 } 260 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 261 #else 262 vput(vp); 263 return (error); 264 #endif 265 } 266 #ifdef COMPAT_10 267 /* Accept `ufs' as an alias for `ffs'. */ 268 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 269 strncpy(fstypename, "ffs", MFSNAMELEN); 270 #endif 271 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 272 vput(vp); 273 return (ENODEV); 274 } 275 if (vp->v_mountedhere != NULL) { 276 vput(vp); 277 return (EBUSY); 278 } 279 280 /* 281 * Allocate and initialize the file system. 282 */ 283 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 284 M_MOUNT, M_WAITOK); 285 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 286 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 287 (void)vfs_busy(mp, LK_NOWAIT, 0); 288 mp->mnt_op = vfs; 289 vfs->vfs_refcount++; 290 mp->mnt_vnodecovered = vp; 291 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 292 mp->mnt_unmounter = NULL; 293 update: 294 /* 295 * Set the mount level flags. 296 */ 297 if (SCARG(uap, flags) & MNT_RDONLY) 298 mp->mnt_flag |= MNT_RDONLY; 299 else if (mp->mnt_flag & MNT_RDONLY) 300 mp->mnt_flag |= MNT_WANTRDWR; 301 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 302 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 303 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 304 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 305 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 306 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 307 MNT_SOFTDEP); 308 /* 309 * Mount the filesystem. 310 */ 311 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 312 if (mp->mnt_flag & MNT_UPDATE) { 313 vrele(vp); 314 if (mp->mnt_flag & MNT_WANTRDWR) 315 mp->mnt_flag &= ~MNT_RDONLY; 316 mp->mnt_flag &=~ 317 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 318 if (error) 319 mp->mnt_flag = flag; 320 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 321 if (mp->mnt_syncer == NULL) 322 error = vfs_allocate_syncvnode(mp); 323 } else { 324 if (mp->mnt_syncer != NULL) 325 vfs_deallocate_syncvnode(mp); 326 } 327 vfs_unbusy(mp); 328 return (error); 329 } 330 /* 331 * Put the new filesystem on the mount list after root. 332 */ 333 cache_purge(vp); 334 if (!error) { 335 vp->v_mountedhere = mp; 336 simple_lock(&mountlist_slock); 337 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 338 simple_unlock(&mountlist_slock); 339 checkdirs(vp); 340 VOP_UNLOCK(vp, 0); 341 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 342 error = vfs_allocate_syncvnode(mp); 343 vfs_unbusy(mp); 344 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 345 if ((error = VFS_START(mp, 0, p))) 346 vrele(vp); 347 } else { 348 vp->v_mountedhere = (struct mount *)0; 349 vfs->vfs_refcount--; 350 vfs_unbusy(mp); 351 free((caddr_t)mp, M_MOUNT); 352 vput(vp); 353 } 354 return (error); 355 } 356 357 /* 358 * Scan all active processes to see if any of them have a current 359 * or root directory onto which the new filesystem has just been 360 * mounted. If so, replace them with the new mount point. 361 */ 362 void 363 checkdirs(olddp) 364 struct vnode *olddp; 365 { 366 struct cwdinfo *cwdi; 367 struct vnode *newdp; 368 struct proc *p; 369 370 if (olddp->v_usecount == 1) 371 return; 372 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 373 panic("mount: lost mount"); 374 proclist_lock_read(); 375 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 376 cwdi = p->p_cwdi; 377 if (cwdi->cwdi_cdir == olddp) { 378 vrele(cwdi->cwdi_cdir); 379 VREF(newdp); 380 cwdi->cwdi_cdir = newdp; 381 } 382 if (cwdi->cwdi_rdir == olddp) { 383 vrele(cwdi->cwdi_rdir); 384 VREF(newdp); 385 cwdi->cwdi_rdir = newdp; 386 } 387 } 388 proclist_unlock_read(); 389 if (rootvnode == olddp) { 390 vrele(rootvnode); 391 VREF(newdp); 392 rootvnode = newdp; 393 } 394 vput(newdp); 395 } 396 397 /* 398 * Unmount a file system. 399 * 400 * Note: unmount takes a path to the vnode mounted on as argument, 401 * not special file (as before). 402 */ 403 /* ARGSUSED */ 404 int 405 sys_unmount(p, v, retval) 406 struct proc *p; 407 void *v; 408 register_t *retval; 409 { 410 struct sys_unmount_args /* { 411 syscallarg(const char *) path; 412 syscallarg(int) flags; 413 } */ *uap = v; 414 struct vnode *vp; 415 struct mount *mp; 416 int error; 417 struct nameidata nd; 418 419 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 420 SCARG(uap, path), p); 421 if ((error = namei(&nd)) != 0) 422 return (error); 423 vp = nd.ni_vp; 424 mp = vp->v_mount; 425 426 /* 427 * Only root, or the user that did the original mount is 428 * permitted to unmount this filesystem. 429 */ 430 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 431 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 432 vput(vp); 433 return (error); 434 } 435 436 /* 437 * Don't allow unmounting the root file system. 438 */ 439 if (mp->mnt_flag & MNT_ROOTFS) { 440 vput(vp); 441 return (EINVAL); 442 } 443 444 /* 445 * Must be the root of the filesystem 446 */ 447 if ((vp->v_flag & VROOT) == 0) { 448 vput(vp); 449 return (EINVAL); 450 } 451 vput(vp); 452 453 /* 454 * XXX Freeze syncer. Must do this before locking the 455 * mount point. See dounmount() for details. 456 */ 457 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 458 459 if (vfs_busy(mp, 0, 0)) { 460 lockmgr(&syncer_lock, LK_RELEASE, NULL); 461 return (EBUSY); 462 } 463 464 return (dounmount(mp, SCARG(uap, flags), p)); 465 } 466 467 /* 468 * Do the actual file system unmount. File system is assumed to have been 469 * marked busy by the caller. 470 */ 471 int 472 dounmount(mp, flags, p) 473 struct mount *mp; 474 int flags; 475 struct proc *p; 476 { 477 struct vnode *coveredvp; 478 int error; 479 int async; 480 int used_syncer; 481 482 simple_lock(&mountlist_slock); 483 vfs_unbusy(mp); 484 used_syncer = (mp->mnt_syncer != NULL); 485 486 /* 487 * XXX Syncer must be frozen when we get here. This should really 488 * be done on a per-mountpoint basis, but especially the softdep 489 * code possibly called from the syncer doens't exactly work on a 490 * per-mountpoint basis, so the softdep code would become a maze 491 * of vfs_busy() calls. 492 * 493 * The caller of dounmount() must acquire syncer_lock because 494 * the syncer itself acquires locks in syncer_lock -> vfs_busy 495 * order, and we must preserve that order to avoid deadlock. 496 * 497 * So, if the file system did not use the syncer, now is 498 * the time to release the syncer_lock. 499 */ 500 if (used_syncer == 0) 501 lockmgr(&syncer_lock, LK_RELEASE, NULL); 502 503 mp->mnt_flag |= MNT_UNMOUNT; 504 mp->mnt_unmounter = p; 505 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 506 if (mp->mnt_flag & MNT_EXPUBLIC) 507 vfs_setpublicfs(NULL, NULL, NULL); 508 async = mp->mnt_flag & MNT_ASYNC; 509 mp->mnt_flag &= ~MNT_ASYNC; 510 cache_purgevfs(mp); /* remove cache entries for this file sys */ 511 if (mp->mnt_syncer != NULL) 512 vfs_deallocate_syncvnode(mp); 513 if (((mp->mnt_flag & MNT_RDONLY) || 514 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 515 (flags & MNT_FORCE)) 516 error = VFS_UNMOUNT(mp, flags, p); 517 simple_lock(&mountlist_slock); 518 if (error) { 519 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 520 (void) vfs_allocate_syncvnode(mp); 521 mp->mnt_flag &= ~MNT_UNMOUNT; 522 mp->mnt_unmounter = NULL; 523 mp->mnt_flag |= async; 524 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 525 &mountlist_slock); 526 if (used_syncer) 527 lockmgr(&syncer_lock, LK_RELEASE, NULL); 528 while (mp->mnt_wcnt > 0) { 529 wakeup((caddr_t)mp); 530 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 531 } 532 return (error); 533 } 534 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 535 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 536 coveredvp->v_mountedhere = NULL; 537 vrele(coveredvp); 538 } 539 mp->mnt_op->vfs_refcount--; 540 if (mp->mnt_vnodelist.lh_first != NULL) 541 panic("unmount: dangling vnode"); 542 mp->mnt_flag |= MNT_GONE; 543 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 544 if (used_syncer) 545 lockmgr(&syncer_lock, LK_RELEASE, NULL); 546 while(mp->mnt_wcnt > 0) { 547 wakeup((caddr_t)mp); 548 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 549 } 550 free((caddr_t)mp, M_MOUNT); 551 return (0); 552 } 553 554 /* 555 * Sync each mounted filesystem. 556 */ 557 #ifdef DEBUG 558 int syncprt = 0; 559 struct ctldebug debug0 = { "syncprt", &syncprt }; 560 #endif 561 562 /* ARGSUSED */ 563 int 564 sys_sync(p, v, retval) 565 struct proc *p; 566 void *v; 567 register_t *retval; 568 { 569 struct mount *mp, *nmp; 570 int asyncflag; 571 572 simple_lock(&mountlist_slock); 573 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 574 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 575 nmp = mp->mnt_list.cqe_prev; 576 continue; 577 } 578 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 579 asyncflag = mp->mnt_flag & MNT_ASYNC; 580 mp->mnt_flag &= ~MNT_ASYNC; 581 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 582 if (asyncflag) 583 mp->mnt_flag |= MNT_ASYNC; 584 } 585 simple_lock(&mountlist_slock); 586 nmp = mp->mnt_list.cqe_prev; 587 vfs_unbusy(mp); 588 589 } 590 simple_unlock(&mountlist_slock); 591 #ifdef DEBUG 592 if (syncprt) 593 vfs_bufstats(); 594 #endif /* DEBUG */ 595 return (0); 596 } 597 598 /* 599 * Change filesystem quotas. 600 */ 601 /* ARGSUSED */ 602 int 603 sys_quotactl(p, v, retval) 604 struct proc *p; 605 void *v; 606 register_t *retval; 607 { 608 struct sys_quotactl_args /* { 609 syscallarg(const char *) path; 610 syscallarg(int) cmd; 611 syscallarg(int) uid; 612 syscallarg(caddr_t) arg; 613 } */ *uap = v; 614 struct mount *mp; 615 int error; 616 struct nameidata nd; 617 618 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 619 if ((error = namei(&nd)) != 0) 620 return (error); 621 mp = nd.ni_vp->v_mount; 622 vrele(nd.ni_vp); 623 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 624 SCARG(uap, arg), p)); 625 } 626 627 /* 628 * Get filesystem statistics. 629 */ 630 /* ARGSUSED */ 631 int 632 sys_statfs(p, v, retval) 633 struct proc *p; 634 void *v; 635 register_t *retval; 636 { 637 struct sys_statfs_args /* { 638 syscallarg(const char *) path; 639 syscallarg(struct statfs *) buf; 640 } */ *uap = v; 641 struct mount *mp; 642 struct statfs *sp; 643 int error; 644 struct nameidata nd; 645 646 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 647 if ((error = namei(&nd)) != 0) 648 return (error); 649 mp = nd.ni_vp->v_mount; 650 sp = &mp->mnt_stat; 651 vrele(nd.ni_vp); 652 if ((error = VFS_STATFS(mp, sp, p)) != 0) 653 return (error); 654 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 655 sp->f_oflags = sp->f_flags & 0xffff; 656 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 657 } 658 659 /* 660 * Get filesystem statistics. 661 */ 662 /* ARGSUSED */ 663 int 664 sys_fstatfs(p, v, retval) 665 struct proc *p; 666 void *v; 667 register_t *retval; 668 { 669 struct sys_fstatfs_args /* { 670 syscallarg(int) fd; 671 syscallarg(struct statfs *) buf; 672 } */ *uap = v; 673 struct file *fp; 674 struct mount *mp; 675 struct statfs *sp; 676 int error; 677 678 /* getvnode() will use the descriptor for us */ 679 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 680 return (error); 681 mp = ((struct vnode *)fp->f_data)->v_mount; 682 sp = &mp->mnt_stat; 683 if ((error = VFS_STATFS(mp, sp, p)) != 0) 684 goto out; 685 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 686 sp->f_oflags = sp->f_flags & 0xffff; 687 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 688 out: 689 FILE_UNUSE(fp, p); 690 return (error); 691 } 692 693 /* 694 * Get statistics on all filesystems. 695 */ 696 int 697 sys_getfsstat(p, v, retval) 698 struct proc *p; 699 void *v; 700 register_t *retval; 701 { 702 struct sys_getfsstat_args /* { 703 syscallarg(struct statfs *) buf; 704 syscallarg(long) bufsize; 705 syscallarg(int) flags; 706 } */ *uap = v; 707 struct mount *mp, *nmp; 708 struct statfs *sp; 709 caddr_t sfsp; 710 long count, maxcount, error; 711 712 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 713 sfsp = (caddr_t)SCARG(uap, buf); 714 simple_lock(&mountlist_slock); 715 count = 0; 716 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 717 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 718 nmp = mp->mnt_list.cqe_next; 719 continue; 720 } 721 if (sfsp && count < maxcount) { 722 sp = &mp->mnt_stat; 723 /* 724 * If MNT_NOWAIT or MNT_LAZY is specified, do not 725 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 726 * overrides MNT_NOWAIT. 727 */ 728 if (SCARG(uap, flags) != MNT_NOWAIT && 729 SCARG(uap, flags) != MNT_LAZY && 730 (SCARG(uap, flags) == MNT_WAIT || 731 SCARG(uap, flags) == 0) && 732 (error = VFS_STATFS(mp, sp, p)) != 0) { 733 simple_lock(&mountlist_slock); 734 nmp = mp->mnt_list.cqe_next; 735 vfs_unbusy(mp); 736 continue; 737 } 738 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 739 sp->f_oflags = sp->f_flags & 0xffff; 740 error = copyout(sp, sfsp, sizeof(*sp)); 741 if (error) { 742 vfs_unbusy(mp); 743 return (error); 744 } 745 sfsp += sizeof(*sp); 746 } 747 count++; 748 simple_lock(&mountlist_slock); 749 nmp = mp->mnt_list.cqe_next; 750 vfs_unbusy(mp); 751 } 752 simple_unlock(&mountlist_slock); 753 if (sfsp && count > maxcount) 754 *retval = maxcount; 755 else 756 *retval = count; 757 return (0); 758 } 759 760 /* 761 * Change current working directory to a given file descriptor. 762 */ 763 /* ARGSUSED */ 764 int 765 sys_fchdir(p, v, retval) 766 struct proc *p; 767 void *v; 768 register_t *retval; 769 { 770 struct sys_fchdir_args /* { 771 syscallarg(int) fd; 772 } */ *uap = v; 773 struct filedesc *fdp = p->p_fd; 774 struct cwdinfo *cwdi = p->p_cwdi; 775 struct vnode *vp, *tdp; 776 struct mount *mp; 777 struct file *fp; 778 int error; 779 780 /* getvnode() will use the descriptor for us */ 781 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 782 return (error); 783 vp = (struct vnode *)fp->f_data; 784 785 VREF(vp); 786 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 787 if (vp->v_type != VDIR) 788 error = ENOTDIR; 789 else 790 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 791 while (!error && (mp = vp->v_mountedhere) != NULL) { 792 if (vfs_busy(mp, 0, 0)) 793 continue; 794 error = VFS_ROOT(mp, &tdp); 795 vfs_unbusy(mp); 796 if (error) 797 break; 798 vput(vp); 799 vp = tdp; 800 } 801 if (error) { 802 vput(vp); 803 goto out; 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* 808 * Disallow changing to a directory not under the process's 809 * current root directory (if there is one). 810 */ 811 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 812 vrele(vp); 813 error = EPERM; /* operation not permitted */ 814 goto out; 815 } 816 817 vrele(cwdi->cwdi_cdir); 818 cwdi->cwdi_cdir = vp; 819 out: 820 FILE_UNUSE(fp, p); 821 return (error); 822 } 823 824 /* 825 * Change this process's notion of the root directory to a given file descriptor. 826 */ 827 828 int 829 sys_fchroot(p, v, retval) 830 struct proc *p; 831 void *v; 832 register_t *retval; 833 { 834 struct sys_fchroot_args *uap = v; 835 struct filedesc *fdp = p->p_fd; 836 struct cwdinfo *cwdi = p->p_cwdi; 837 struct vnode *vp; 838 struct file *fp; 839 int error; 840 841 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 842 return error; 843 /* getvnode() will use the descriptor for us */ 844 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 845 return error; 846 vp = (struct vnode *) fp->f_data; 847 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 848 if (vp->v_type != VDIR) 849 error = ENOTDIR; 850 else 851 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 852 VOP_UNLOCK(vp, 0); 853 if (error) 854 goto out; 855 VREF(vp); 856 857 /* 858 * Prevent escaping from chroot by putting the root under 859 * the working directory. Silently chdir to / if we aren't 860 * already there. 861 */ 862 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 863 /* 864 * XXX would be more failsafe to change directory to a 865 * deadfs node here instead 866 */ 867 vrele(cwdi->cwdi_cdir); 868 VREF(vp); 869 cwdi->cwdi_cdir = vp; 870 } 871 872 if (cwdi->cwdi_rdir != NULL) 873 vrele(cwdi->cwdi_rdir); 874 cwdi->cwdi_rdir = vp; 875 out: 876 FILE_UNUSE(fp, p); 877 return (error); 878 } 879 880 881 882 /* 883 * Change current working directory (``.''). 884 */ 885 /* ARGSUSED */ 886 int 887 sys_chdir(p, v, retval) 888 struct proc *p; 889 void *v; 890 register_t *retval; 891 { 892 struct sys_chdir_args /* { 893 syscallarg(const char *) path; 894 } */ *uap = v; 895 struct cwdinfo *cwdi = p->p_cwdi; 896 int error; 897 struct nameidata nd; 898 899 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 900 SCARG(uap, path), p); 901 if ((error = change_dir(&nd, p)) != 0) 902 return (error); 903 vrele(cwdi->cwdi_cdir); 904 cwdi->cwdi_cdir = nd.ni_vp; 905 return (0); 906 } 907 908 /* 909 * Change notion of root (``/'') directory. 910 */ 911 /* ARGSUSED */ 912 int 913 sys_chroot(p, v, retval) 914 struct proc *p; 915 void *v; 916 register_t *retval; 917 { 918 struct sys_chroot_args /* { 919 syscallarg(const char *) path; 920 } */ *uap = v; 921 struct cwdinfo *cwdi = p->p_cwdi; 922 struct vnode *vp; 923 int error; 924 struct nameidata nd; 925 926 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 927 return (error); 928 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 929 SCARG(uap, path), p); 930 if ((error = change_dir(&nd, p)) != 0) 931 return (error); 932 if (cwdi->cwdi_rdir != NULL) 933 vrele(cwdi->cwdi_rdir); 934 vp = nd.ni_vp; 935 cwdi->cwdi_rdir = vp; 936 937 /* 938 * Prevent escaping from chroot by putting the root under 939 * the working directory. Silently chdir to / if we aren't 940 * already there. 941 */ 942 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 943 /* 944 * XXX would be more failsafe to change directory to a 945 * deadfs node here instead 946 */ 947 vrele(cwdi->cwdi_cdir); 948 VREF(vp); 949 cwdi->cwdi_cdir = vp; 950 } 951 952 return (0); 953 } 954 955 /* 956 * Common routine for chroot and chdir. 957 */ 958 static int 959 change_dir(ndp, p) 960 struct nameidata *ndp; 961 struct proc *p; 962 { 963 struct vnode *vp; 964 int error; 965 966 if ((error = namei(ndp)) != 0) 967 return (error); 968 vp = ndp->ni_vp; 969 if (vp->v_type != VDIR) 970 error = ENOTDIR; 971 else 972 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 973 974 if (error) 975 vput(vp); 976 else 977 VOP_UNLOCK(vp, 0); 978 return (error); 979 } 980 981 /* 982 * Check permissions, allocate an open file structure, 983 * and call the device open routine if any. 984 */ 985 int 986 sys_open(p, v, retval) 987 struct proc *p; 988 void *v; 989 register_t *retval; 990 { 991 struct sys_open_args /* { 992 syscallarg(const char *) path; 993 syscallarg(int) flags; 994 syscallarg(int) mode; 995 } */ *uap = v; 996 struct cwdinfo *cwdi = p->p_cwdi; 997 struct filedesc *fdp = p->p_fd; 998 struct file *fp; 999 struct vnode *vp; 1000 int flags, cmode; 1001 int type, indx, error; 1002 struct flock lf; 1003 struct nameidata nd; 1004 1005 flags = FFLAGS(SCARG(uap, flags)); 1006 if ((flags & (FREAD | FWRITE)) == 0) 1007 return (EINVAL); 1008 /* falloc() will use the file descriptor for us */ 1009 if ((error = falloc(p, &fp, &indx)) != 0) 1010 return (error); 1011 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1012 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1013 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1014 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1015 FILE_UNUSE(fp, p); 1016 ffree(fp); 1017 if ((error == ENODEV || error == ENXIO) && 1018 p->p_dupfd >= 0 && /* XXX from fdopen */ 1019 (error = 1020 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1021 *retval = indx; 1022 return (0); 1023 } 1024 if (error == ERESTART) 1025 error = EINTR; 1026 fdremove(fdp, indx); 1027 return (error); 1028 } 1029 p->p_dupfd = 0; 1030 vp = nd.ni_vp; 1031 fp->f_flag = flags & FMASK; 1032 fp->f_type = DTYPE_VNODE; 1033 fp->f_ops = &vnops; 1034 fp->f_data = (caddr_t)vp; 1035 if (flags & (O_EXLOCK | O_SHLOCK)) { 1036 lf.l_whence = SEEK_SET; 1037 lf.l_start = 0; 1038 lf.l_len = 0; 1039 if (flags & O_EXLOCK) 1040 lf.l_type = F_WRLCK; 1041 else 1042 lf.l_type = F_RDLCK; 1043 type = F_FLOCK; 1044 if ((flags & FNONBLOCK) == 0) 1045 type |= F_WAIT; 1046 VOP_UNLOCK(vp, 0); 1047 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1048 if (error) { 1049 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1050 FILE_UNUSE(fp, p); 1051 ffree(fp); 1052 fdremove(fdp, indx); 1053 return (error); 1054 } 1055 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1056 fp->f_flag |= FHASLOCK; 1057 } 1058 VOP_UNLOCK(vp, 0); 1059 *retval = indx; 1060 FILE_SET_MATURE(fp); 1061 FILE_UNUSE(fp, p); 1062 return (0); 1063 } 1064 1065 /* 1066 * Get file handle system call 1067 */ 1068 int 1069 sys_getfh(p, v, retval) 1070 struct proc *p; 1071 void *v; 1072 register_t *retval; 1073 { 1074 struct sys_getfh_args /* { 1075 syscallarg(char *) fname; 1076 syscallarg(fhandle_t *) fhp; 1077 } */ *uap = v; 1078 struct vnode *vp; 1079 fhandle_t fh; 1080 int error; 1081 struct nameidata nd; 1082 1083 /* 1084 * Must be super user 1085 */ 1086 error = suser(p->p_ucred, &p->p_acflag); 1087 if (error) 1088 return (error); 1089 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1090 SCARG(uap, fname), p); 1091 error = namei(&nd); 1092 if (error) 1093 return (error); 1094 vp = nd.ni_vp; 1095 memset((caddr_t)&fh, 0, sizeof(fh)); 1096 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1097 error = VFS_VPTOFH(vp, &fh.fh_fid); 1098 vput(vp); 1099 if (error) 1100 return (error); 1101 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1102 return (error); 1103 } 1104 1105 /* 1106 * Open a file given a file handle. 1107 * 1108 * Check permissions, allocate an open file structure, 1109 * and call the device open routine if any. 1110 */ 1111 int 1112 sys_fhopen(p, v, retval) 1113 struct proc *p; 1114 void *v; 1115 register_t *retval; 1116 { 1117 struct sys_fhopen_args /* { 1118 syscallarg(const fhandle_t *) fhp; 1119 syscallarg(int) flags; 1120 } */ *uap = v; 1121 struct filedesc *fdp = p->p_fd; 1122 struct file *fp; 1123 struct vnode *vp = NULL; 1124 struct mount *mp; 1125 struct ucred *cred = p->p_ucred; 1126 int flags; 1127 struct file *nfp; 1128 int type, indx, error=0; 1129 struct flock lf; 1130 struct vattr va; 1131 fhandle_t fh; 1132 1133 /* 1134 * Must be super user 1135 */ 1136 if ((error = suser(p->p_ucred, &p->p_acflag))) 1137 return (error); 1138 1139 flags = FFLAGS(SCARG(uap, flags)); 1140 if ((flags & (FREAD | FWRITE)) == 0) 1141 return (EINVAL); 1142 if ((flags & O_CREAT)) 1143 return (EINVAL); 1144 /* falloc() will use the file descriptor for us */ 1145 if ((error = falloc(p, &nfp, &indx)) != 0) 1146 return (error); 1147 fp = nfp; 1148 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1149 goto bad; 1150 1151 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1152 error = ESTALE; 1153 goto bad; 1154 } 1155 1156 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1157 vp = NULL; /* most likely unnecessary sanity for bad: */ 1158 goto bad; 1159 } 1160 1161 /* Now do an effective vn_open */ 1162 1163 if (vp->v_type == VSOCK) { 1164 error = EOPNOTSUPP; 1165 goto bad; 1166 } 1167 if (flags & FREAD) { 1168 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1169 goto bad; 1170 } 1171 if (flags & (FWRITE | O_TRUNC)) { 1172 if (vp->v_type == VDIR) { 1173 error = EISDIR; 1174 goto bad; 1175 } 1176 if ((error = vn_writechk(vp)) != 0 || 1177 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1178 goto bad; 1179 } 1180 if (flags & O_TRUNC) { 1181 VOP_UNLOCK(vp, 0); /* XXX */ 1182 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1183 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1184 VATTR_NULL(&va); 1185 va.va_size = 0; 1186 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1187 goto bad; 1188 } 1189 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1190 goto bad; 1191 if (vp->v_type == VREG && 1192 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1193 error = EIO; 1194 goto bad; 1195 } 1196 if (flags & FWRITE) 1197 vp->v_writecount++; 1198 1199 /* done with modified vn_open, now finish what sys_open does. */ 1200 1201 fp->f_flag = flags & FMASK; 1202 fp->f_type = DTYPE_VNODE; 1203 fp->f_ops = &vnops; 1204 fp->f_data = (caddr_t)vp; 1205 if (flags & (O_EXLOCK | O_SHLOCK)) { 1206 lf.l_whence = SEEK_SET; 1207 lf.l_start = 0; 1208 lf.l_len = 0; 1209 if (flags & O_EXLOCK) 1210 lf.l_type = F_WRLCK; 1211 else 1212 lf.l_type = F_RDLCK; 1213 type = F_FLOCK; 1214 if ((flags & FNONBLOCK) == 0) 1215 type |= F_WAIT; 1216 VOP_UNLOCK(vp, 0); 1217 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1218 if (error) { 1219 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1220 FILE_UNUSE(fp, p); 1221 ffree(fp); 1222 fdremove(fdp, indx); 1223 return (error); 1224 } 1225 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1226 fp->f_flag |= FHASLOCK; 1227 } 1228 VOP_UNLOCK(vp, 0); 1229 *retval = indx; 1230 FILE_SET_MATURE(fp); 1231 FILE_UNUSE(fp, p); 1232 return (0); 1233 1234 bad: 1235 FILE_UNUSE(fp, p); 1236 ffree(fp); 1237 fdremove(fdp, indx); 1238 if (vp != NULL) 1239 vput(vp); 1240 return (error); 1241 } 1242 1243 /* ARGSUSED */ 1244 int 1245 sys_fhstat(p, v, retval) 1246 struct proc *p; 1247 void *v; 1248 register_t *retval; 1249 { 1250 struct sys_fhstat_args /* { 1251 syscallarg(const fhandle_t *) fhp; 1252 syscallarg(struct stat *) sb; 1253 } */ *uap = v; 1254 struct stat sb; 1255 int error; 1256 fhandle_t fh; 1257 struct mount *mp; 1258 struct vnode *vp; 1259 1260 /* 1261 * Must be super user 1262 */ 1263 if ((error = suser(p->p_ucred, &p->p_acflag))) 1264 return (error); 1265 1266 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1267 return (error); 1268 1269 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1270 return (ESTALE); 1271 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1272 return (error); 1273 error = vn_stat(vp, &sb, p); 1274 vput(vp); 1275 if (error) 1276 return (error); 1277 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1278 return (error); 1279 } 1280 1281 /* ARGSUSED */ 1282 int 1283 sys_fhstatfs(p, v, retval) 1284 struct proc *p; 1285 void *v; 1286 register_t *retval; 1287 { 1288 struct sys_fhstatfs_args /* 1289 syscallarg(const fhandle_t *) fhp; 1290 syscallarg(struct statfs *) buf; 1291 } */ *uap = v; 1292 struct statfs sp; 1293 fhandle_t fh; 1294 struct mount *mp; 1295 struct vnode *vp; 1296 int error; 1297 1298 /* 1299 * Must be super user 1300 */ 1301 if ((error = suser(p->p_ucred, &p->p_acflag))) 1302 return (error); 1303 1304 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1305 return (error); 1306 1307 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1308 return (ESTALE); 1309 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1310 return (error); 1311 mp = vp->v_mount; 1312 vput(vp); 1313 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1314 return (error); 1315 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1316 sp.f_oflags = sp.f_flags & 0xffff; 1317 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1318 } 1319 1320 /* 1321 * Create a special file. 1322 */ 1323 /* ARGSUSED */ 1324 int 1325 sys_mknod(p, v, retval) 1326 struct proc *p; 1327 void *v; 1328 register_t *retval; 1329 { 1330 struct sys_mknod_args /* { 1331 syscallarg(const char *) path; 1332 syscallarg(int) mode; 1333 syscallarg(int) dev; 1334 } */ *uap = v; 1335 struct vnode *vp; 1336 struct vattr vattr; 1337 int error; 1338 int whiteout = 0; 1339 struct nameidata nd; 1340 1341 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1342 return (error); 1343 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1344 if ((error = namei(&nd)) != 0) 1345 return (error); 1346 vp = nd.ni_vp; 1347 if (vp != NULL) 1348 error = EEXIST; 1349 else { 1350 VATTR_NULL(&vattr); 1351 vattr.va_mode = 1352 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1353 vattr.va_rdev = SCARG(uap, dev); 1354 whiteout = 0; 1355 1356 switch (SCARG(uap, mode) & S_IFMT) { 1357 case S_IFMT: /* used by badsect to flag bad sectors */ 1358 vattr.va_type = VBAD; 1359 break; 1360 case S_IFCHR: 1361 vattr.va_type = VCHR; 1362 break; 1363 case S_IFBLK: 1364 vattr.va_type = VBLK; 1365 break; 1366 case S_IFWHT: 1367 whiteout = 1; 1368 break; 1369 default: 1370 error = EINVAL; 1371 break; 1372 } 1373 } 1374 if (!error) { 1375 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1376 if (whiteout) { 1377 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1378 if (error) 1379 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1380 vput(nd.ni_dvp); 1381 } else { 1382 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1383 &nd.ni_cnd, &vattr); 1384 if (error == 0) 1385 vput(nd.ni_vp); 1386 } 1387 } else { 1388 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1389 if (nd.ni_dvp == vp) 1390 vrele(nd.ni_dvp); 1391 else 1392 vput(nd.ni_dvp); 1393 if (vp) 1394 vrele(vp); 1395 } 1396 return (error); 1397 } 1398 1399 /* 1400 * Create a named pipe. 1401 */ 1402 /* ARGSUSED */ 1403 int 1404 sys_mkfifo(p, v, retval) 1405 struct proc *p; 1406 void *v; 1407 register_t *retval; 1408 { 1409 struct sys_mkfifo_args /* { 1410 syscallarg(const char *) path; 1411 syscallarg(int) mode; 1412 } */ *uap = v; 1413 struct vattr vattr; 1414 int error; 1415 struct nameidata nd; 1416 1417 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1418 if ((error = namei(&nd)) != 0) 1419 return (error); 1420 if (nd.ni_vp != NULL) { 1421 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1422 if (nd.ni_dvp == nd.ni_vp) 1423 vrele(nd.ni_dvp); 1424 else 1425 vput(nd.ni_dvp); 1426 vrele(nd.ni_vp); 1427 return (EEXIST); 1428 } 1429 VATTR_NULL(&vattr); 1430 vattr.va_type = VFIFO; 1431 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1432 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1433 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1434 if (error == 0) 1435 vput(nd.ni_vp); 1436 return (error); 1437 } 1438 1439 /* 1440 * Make a hard file link. 1441 */ 1442 /* ARGSUSED */ 1443 int 1444 sys_link(p, v, retval) 1445 struct proc *p; 1446 void *v; 1447 register_t *retval; 1448 { 1449 struct sys_link_args /* { 1450 syscallarg(const char *) path; 1451 syscallarg(const char *) link; 1452 } */ *uap = v; 1453 struct vnode *vp; 1454 struct nameidata nd; 1455 int error; 1456 1457 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1458 if ((error = namei(&nd)) != 0) 1459 return (error); 1460 vp = nd.ni_vp; 1461 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1462 if ((error = namei(&nd)) != 0) 1463 goto out; 1464 if (nd.ni_vp) { 1465 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1466 if (nd.ni_dvp == nd.ni_vp) 1467 vrele(nd.ni_dvp); 1468 else 1469 vput(nd.ni_dvp); 1470 vrele(nd.ni_vp); 1471 error = EEXIST; 1472 goto out; 1473 } 1474 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1475 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1476 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1477 out: 1478 vrele(vp); 1479 return (error); 1480 } 1481 1482 /* 1483 * Make a symbolic link. 1484 */ 1485 /* ARGSUSED */ 1486 int 1487 sys_symlink(p, v, retval) 1488 struct proc *p; 1489 void *v; 1490 register_t *retval; 1491 { 1492 struct sys_symlink_args /* { 1493 syscallarg(const char *) path; 1494 syscallarg(const char *) link; 1495 } */ *uap = v; 1496 struct vattr vattr; 1497 char *path; 1498 int error; 1499 struct nameidata nd; 1500 1501 path = PNBUF_GET(); 1502 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1503 if (error) 1504 goto out; 1505 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1506 if ((error = namei(&nd)) != 0) 1507 goto out; 1508 if (nd.ni_vp) { 1509 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1510 if (nd.ni_dvp == nd.ni_vp) 1511 vrele(nd.ni_dvp); 1512 else 1513 vput(nd.ni_dvp); 1514 vrele(nd.ni_vp); 1515 error = EEXIST; 1516 goto out; 1517 } 1518 VATTR_NULL(&vattr); 1519 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1520 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1521 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1522 if (error == 0) 1523 vput(nd.ni_vp); 1524 out: 1525 PNBUF_PUT(path); 1526 return (error); 1527 } 1528 1529 /* 1530 * Delete a whiteout from the filesystem. 1531 */ 1532 /* ARGSUSED */ 1533 int 1534 sys_undelete(p, v, retval) 1535 struct proc *p; 1536 void *v; 1537 register_t *retval; 1538 { 1539 struct sys_undelete_args /* { 1540 syscallarg(const char *) path; 1541 } */ *uap = v; 1542 int error; 1543 struct nameidata nd; 1544 1545 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1546 SCARG(uap, path), p); 1547 error = namei(&nd); 1548 if (error) 1549 return (error); 1550 1551 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1552 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1553 if (nd.ni_dvp == nd.ni_vp) 1554 vrele(nd.ni_dvp); 1555 else 1556 vput(nd.ni_dvp); 1557 if (nd.ni_vp) 1558 vrele(nd.ni_vp); 1559 return (EEXIST); 1560 } 1561 1562 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1563 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1564 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1565 vput(nd.ni_dvp); 1566 return (error); 1567 } 1568 1569 /* 1570 * Delete a name from the filesystem. 1571 */ 1572 /* ARGSUSED */ 1573 int 1574 sys_unlink(p, v, retval) 1575 struct proc *p; 1576 void *v; 1577 register_t *retval; 1578 { 1579 struct sys_unlink_args /* { 1580 syscallarg(const char *) path; 1581 } */ *uap = v; 1582 struct vnode *vp; 1583 int error; 1584 struct nameidata nd; 1585 1586 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1587 SCARG(uap, path), p); 1588 if ((error = namei(&nd)) != 0) 1589 return (error); 1590 vp = nd.ni_vp; 1591 1592 /* 1593 * The root of a mounted filesystem cannot be deleted. 1594 */ 1595 if (vp->v_flag & VROOT) { 1596 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1597 if (nd.ni_dvp == vp) 1598 vrele(nd.ni_dvp); 1599 else 1600 vput(nd.ni_dvp); 1601 vput(vp); 1602 error = EBUSY; 1603 goto out; 1604 } 1605 1606 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1607 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1608 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1609 out: 1610 return (error); 1611 } 1612 1613 /* 1614 * Reposition read/write file offset. 1615 */ 1616 int 1617 sys_lseek(p, v, retval) 1618 struct proc *p; 1619 void *v; 1620 register_t *retval; 1621 { 1622 struct sys_lseek_args /* { 1623 syscallarg(int) fd; 1624 syscallarg(int) pad; 1625 syscallarg(off_t) offset; 1626 syscallarg(int) whence; 1627 } */ *uap = v; 1628 struct ucred *cred = p->p_ucred; 1629 struct filedesc *fdp = p->p_fd; 1630 struct file *fp; 1631 struct vnode *vp; 1632 struct vattr vattr; 1633 off_t newoff; 1634 int error; 1635 1636 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1637 return (EBADF); 1638 1639 FILE_USE(fp); 1640 1641 vp = (struct vnode *)fp->f_data; 1642 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1643 error = ESPIPE; 1644 goto out; 1645 } 1646 1647 switch (SCARG(uap, whence)) { 1648 case SEEK_CUR: 1649 newoff = fp->f_offset + SCARG(uap, offset); 1650 break; 1651 case SEEK_END: 1652 error = VOP_GETATTR(vp, &vattr, cred, p); 1653 if (error) 1654 goto out; 1655 newoff = SCARG(uap, offset) + vattr.va_size; 1656 break; 1657 case SEEK_SET: 1658 newoff = SCARG(uap, offset); 1659 break; 1660 default: 1661 error = EINVAL; 1662 goto out; 1663 } 1664 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1665 goto out; 1666 1667 *(off_t *)retval = fp->f_offset = newoff; 1668 out: 1669 FILE_UNUSE(fp, p); 1670 return (error); 1671 } 1672 1673 /* 1674 * Positional read system call. 1675 */ 1676 int 1677 sys_pread(p, v, retval) 1678 struct proc *p; 1679 void *v; 1680 register_t *retval; 1681 { 1682 struct sys_pread_args /* { 1683 syscallarg(int) fd; 1684 syscallarg(void *) buf; 1685 syscallarg(size_t) nbyte; 1686 syscallarg(off_t) offset; 1687 } */ *uap = v; 1688 struct filedesc *fdp = p->p_fd; 1689 struct file *fp; 1690 struct vnode *vp; 1691 off_t offset; 1692 int error, fd = SCARG(uap, fd); 1693 1694 if ((fp = fd_getfile(fdp, fd)) == NULL) 1695 return (EBADF); 1696 1697 if ((fp->f_flag & FREAD) == 0) 1698 return (EBADF); 1699 1700 FILE_USE(fp); 1701 1702 vp = (struct vnode *)fp->f_data; 1703 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1704 error = ESPIPE; 1705 goto out; 1706 } 1707 1708 offset = SCARG(uap, offset); 1709 1710 /* 1711 * XXX This works because no file systems actually 1712 * XXX take any action on the seek operation. 1713 */ 1714 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1715 goto out; 1716 1717 /* dofileread() will unuse the descriptor for us */ 1718 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1719 &offset, 0, retval)); 1720 1721 out: 1722 FILE_UNUSE(fp, p); 1723 return (error); 1724 } 1725 1726 /* 1727 * Positional scatter read system call. 1728 */ 1729 int 1730 sys_preadv(p, v, retval) 1731 struct proc *p; 1732 void *v; 1733 register_t *retval; 1734 { 1735 struct sys_preadv_args /* { 1736 syscallarg(int) fd; 1737 syscallarg(const struct iovec *) iovp; 1738 syscallarg(int) iovcnt; 1739 syscallarg(off_t) offset; 1740 } */ *uap = v; 1741 struct filedesc *fdp = p->p_fd; 1742 struct file *fp; 1743 struct vnode *vp; 1744 off_t offset; 1745 int error, fd = SCARG(uap, fd); 1746 1747 if ((fp = fd_getfile(fdp, fd)) == NULL) 1748 return (EBADF); 1749 1750 if ((fp->f_flag & FREAD) == 0) 1751 return (EBADF); 1752 1753 FILE_USE(fp); 1754 1755 vp = (struct vnode *)fp->f_data; 1756 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1757 error = ESPIPE; 1758 goto out; 1759 } 1760 1761 offset = SCARG(uap, offset); 1762 1763 /* 1764 * XXX This works because no file systems actually 1765 * XXX take any action on the seek operation. 1766 */ 1767 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1768 goto out; 1769 1770 /* dofilereadv() will unuse the descriptor for us */ 1771 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1772 &offset, 0, retval)); 1773 1774 out: 1775 FILE_UNUSE(fp, p); 1776 return (error); 1777 } 1778 1779 /* 1780 * Positional write system call. 1781 */ 1782 int 1783 sys_pwrite(p, v, retval) 1784 struct proc *p; 1785 void *v; 1786 register_t *retval; 1787 { 1788 struct sys_pwrite_args /* { 1789 syscallarg(int) fd; 1790 syscallarg(const void *) buf; 1791 syscallarg(size_t) nbyte; 1792 syscallarg(off_t) offset; 1793 } */ *uap = v; 1794 struct filedesc *fdp = p->p_fd; 1795 struct file *fp; 1796 struct vnode *vp; 1797 off_t offset; 1798 int error, fd = SCARG(uap, fd); 1799 1800 if ((fp = fd_getfile(fdp, fd)) == NULL) 1801 return (EBADF); 1802 1803 if ((fp->f_flag & FWRITE) == 0) 1804 return (EBADF); 1805 1806 FILE_USE(fp); 1807 1808 vp = (struct vnode *)fp->f_data; 1809 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1810 error = ESPIPE; 1811 goto out; 1812 } 1813 1814 offset = SCARG(uap, offset); 1815 1816 /* 1817 * XXX This works because no file systems actually 1818 * XXX take any action on the seek operation. 1819 */ 1820 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1821 goto out; 1822 1823 /* dofilewrite() will unuse the descriptor for us */ 1824 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1825 &offset, 0, retval)); 1826 1827 out: 1828 FILE_UNUSE(fp, p); 1829 return (error); 1830 } 1831 1832 /* 1833 * Positional gather write system call. 1834 */ 1835 int 1836 sys_pwritev(p, v, retval) 1837 struct proc *p; 1838 void *v; 1839 register_t *retval; 1840 { 1841 struct sys_pwritev_args /* { 1842 syscallarg(int) fd; 1843 syscallarg(const struct iovec *) iovp; 1844 syscallarg(int) iovcnt; 1845 syscallarg(off_t) offset; 1846 } */ *uap = v; 1847 struct filedesc *fdp = p->p_fd; 1848 struct file *fp; 1849 struct vnode *vp; 1850 off_t offset; 1851 int error, fd = SCARG(uap, fd); 1852 1853 if ((fp = fd_getfile(fdp, fd)) == NULL) 1854 return (EBADF); 1855 1856 if ((fp->f_flag & FWRITE) == 0) 1857 return (EBADF); 1858 1859 FILE_USE(fp); 1860 1861 vp = (struct vnode *)fp->f_data; 1862 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1863 error = ESPIPE; 1864 goto out; 1865 } 1866 1867 offset = SCARG(uap, offset); 1868 1869 /* 1870 * XXX This works because no file systems actually 1871 * XXX take any action on the seek operation. 1872 */ 1873 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1874 goto out; 1875 1876 /* dofilewritev() will unuse the descriptor for us */ 1877 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1878 &offset, 0, retval)); 1879 1880 out: 1881 FILE_UNUSE(fp, p); 1882 return (error); 1883 } 1884 1885 /* 1886 * Check access permissions. 1887 */ 1888 int 1889 sys_access(p, v, retval) 1890 struct proc *p; 1891 void *v; 1892 register_t *retval; 1893 { 1894 struct sys_access_args /* { 1895 syscallarg(const char *) path; 1896 syscallarg(int) flags; 1897 } */ *uap = v; 1898 struct ucred *cred = p->p_ucred; 1899 struct vnode *vp; 1900 int error, flags, t_gid, t_uid; 1901 struct nameidata nd; 1902 1903 t_uid = cred->cr_uid; 1904 t_gid = cred->cr_gid; 1905 cred->cr_uid = p->p_cred->p_ruid; 1906 cred->cr_gid = p->p_cred->p_rgid; 1907 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1908 SCARG(uap, path), p); 1909 if ((error = namei(&nd)) != 0) 1910 goto out1; 1911 vp = nd.ni_vp; 1912 1913 /* Flags == 0 means only check for existence. */ 1914 if (SCARG(uap, flags)) { 1915 flags = 0; 1916 if (SCARG(uap, flags) & R_OK) 1917 flags |= VREAD; 1918 if (SCARG(uap, flags) & W_OK) 1919 flags |= VWRITE; 1920 if (SCARG(uap, flags) & X_OK) 1921 flags |= VEXEC; 1922 1923 error = VOP_ACCESS(vp, flags, cred, p); 1924 if (!error && (flags & VWRITE)) 1925 error = vn_writechk(vp); 1926 } 1927 vput(vp); 1928 out1: 1929 cred->cr_uid = t_uid; 1930 cred->cr_gid = t_gid; 1931 return (error); 1932 } 1933 1934 /* 1935 * Get file status; this version follows links. 1936 */ 1937 /* ARGSUSED */ 1938 int 1939 sys___stat13(p, v, retval) 1940 struct proc *p; 1941 void *v; 1942 register_t *retval; 1943 { 1944 struct sys___stat13_args /* { 1945 syscallarg(const char *) path; 1946 syscallarg(struct stat *) ub; 1947 } */ *uap = v; 1948 struct stat sb; 1949 int error; 1950 struct nameidata nd; 1951 1952 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1953 SCARG(uap, path), p); 1954 if ((error = namei(&nd)) != 0) 1955 return (error); 1956 error = vn_stat(nd.ni_vp, &sb, p); 1957 vput(nd.ni_vp); 1958 if (error) 1959 return (error); 1960 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1961 return (error); 1962 } 1963 1964 /* 1965 * Get file status; this version does not follow links. 1966 */ 1967 /* ARGSUSED */ 1968 int 1969 sys___lstat13(p, v, retval) 1970 struct proc *p; 1971 void *v; 1972 register_t *retval; 1973 { 1974 struct sys___lstat13_args /* { 1975 syscallarg(const char *) path; 1976 syscallarg(struct stat *) ub; 1977 } */ *uap = v; 1978 struct stat sb; 1979 int error; 1980 struct nameidata nd; 1981 1982 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1983 SCARG(uap, path), p); 1984 if ((error = namei(&nd)) != 0) 1985 return (error); 1986 error = vn_stat(nd.ni_vp, &sb, p); 1987 vput(nd.ni_vp); 1988 if (error) 1989 return (error); 1990 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1991 return (error); 1992 } 1993 1994 /* 1995 * Get configurable pathname variables. 1996 */ 1997 /* ARGSUSED */ 1998 int 1999 sys_pathconf(p, v, retval) 2000 struct proc *p; 2001 void *v; 2002 register_t *retval; 2003 { 2004 struct sys_pathconf_args /* { 2005 syscallarg(const char *) path; 2006 syscallarg(int) name; 2007 } */ *uap = v; 2008 int error; 2009 struct nameidata nd; 2010 2011 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2012 SCARG(uap, path), p); 2013 if ((error = namei(&nd)) != 0) 2014 return (error); 2015 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2016 vput(nd.ni_vp); 2017 return (error); 2018 } 2019 2020 /* 2021 * Return target name of a symbolic link. 2022 */ 2023 /* ARGSUSED */ 2024 int 2025 sys_readlink(p, v, retval) 2026 struct proc *p; 2027 void *v; 2028 register_t *retval; 2029 { 2030 struct sys_readlink_args /* { 2031 syscallarg(const char *) path; 2032 syscallarg(char *) buf; 2033 syscallarg(size_t) count; 2034 } */ *uap = v; 2035 struct vnode *vp; 2036 struct iovec aiov; 2037 struct uio auio; 2038 int error; 2039 struct nameidata nd; 2040 2041 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2042 SCARG(uap, path), p); 2043 if ((error = namei(&nd)) != 0) 2044 return (error); 2045 vp = nd.ni_vp; 2046 if (vp->v_type != VLNK) 2047 error = EINVAL; 2048 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2049 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2050 aiov.iov_base = SCARG(uap, buf); 2051 aiov.iov_len = SCARG(uap, count); 2052 auio.uio_iov = &aiov; 2053 auio.uio_iovcnt = 1; 2054 auio.uio_offset = 0; 2055 auio.uio_rw = UIO_READ; 2056 auio.uio_segflg = UIO_USERSPACE; 2057 auio.uio_procp = p; 2058 auio.uio_resid = SCARG(uap, count); 2059 error = VOP_READLINK(vp, &auio, p->p_ucred); 2060 } 2061 vput(vp); 2062 *retval = SCARG(uap, count) - auio.uio_resid; 2063 return (error); 2064 } 2065 2066 /* 2067 * Change flags of a file given a path name. 2068 */ 2069 /* ARGSUSED */ 2070 int 2071 sys_chflags(p, v, retval) 2072 struct proc *p; 2073 void *v; 2074 register_t *retval; 2075 { 2076 struct sys_chflags_args /* { 2077 syscallarg(const char *) path; 2078 syscallarg(u_long) flags; 2079 } */ *uap = v; 2080 struct vnode *vp; 2081 int error; 2082 struct nameidata nd; 2083 2084 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2085 if ((error = namei(&nd)) != 0) 2086 return (error); 2087 vp = nd.ni_vp; 2088 error = change_flags(vp, SCARG(uap, flags), p); 2089 vput(vp); 2090 return (error); 2091 } 2092 2093 /* 2094 * Change flags of a file given a file descriptor. 2095 */ 2096 /* ARGSUSED */ 2097 int 2098 sys_fchflags(p, v, retval) 2099 struct proc *p; 2100 void *v; 2101 register_t *retval; 2102 { 2103 struct sys_fchflags_args /* { 2104 syscallarg(int) fd; 2105 syscallarg(u_long) flags; 2106 } */ *uap = v; 2107 struct vnode *vp; 2108 struct file *fp; 2109 int error; 2110 2111 /* getvnode() will use the descriptor for us */ 2112 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2113 return (error); 2114 vp = (struct vnode *)fp->f_data; 2115 error = change_flags(vp, SCARG(uap, flags), p); 2116 VOP_UNLOCK(vp, 0); 2117 FILE_UNUSE(fp, p); 2118 return (error); 2119 } 2120 2121 /* 2122 * Change flags of a file given a path name; this version does 2123 * not follow links. 2124 */ 2125 int 2126 sys_lchflags(p, v, retval) 2127 struct proc *p; 2128 void *v; 2129 register_t *retval; 2130 { 2131 struct sys_lchflags_args /* { 2132 syscallarg(const char *) path; 2133 syscallarg(u_long) flags; 2134 } */ *uap = v; 2135 struct vnode *vp; 2136 int error; 2137 struct nameidata nd; 2138 2139 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2140 if ((error = namei(&nd)) != 0) 2141 return (error); 2142 vp = nd.ni_vp; 2143 error = change_flags(vp, SCARG(uap, flags), p); 2144 vput(vp); 2145 return (error); 2146 } 2147 2148 /* 2149 * Common routine to change flags of a file. 2150 */ 2151 int 2152 change_flags(vp, flags, p) 2153 struct vnode *vp; 2154 u_long flags; 2155 struct proc *p; 2156 { 2157 struct vattr vattr; 2158 int error; 2159 2160 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2161 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2162 /* 2163 * Non-superusers cannot change the flags on devices, even if they 2164 * own them. 2165 */ 2166 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2167 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2168 goto out; 2169 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2170 error = EINVAL; 2171 goto out; 2172 } 2173 } 2174 VATTR_NULL(&vattr); 2175 vattr.va_flags = flags; 2176 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2177 out: 2178 return (error); 2179 } 2180 2181 /* 2182 * Change mode of a file given path name; this version follows links. 2183 */ 2184 /* ARGSUSED */ 2185 int 2186 sys_chmod(p, v, retval) 2187 struct proc *p; 2188 void *v; 2189 register_t *retval; 2190 { 2191 struct sys_chmod_args /* { 2192 syscallarg(const char *) path; 2193 syscallarg(int) mode; 2194 } */ *uap = v; 2195 int error; 2196 struct nameidata nd; 2197 2198 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2199 if ((error = namei(&nd)) != 0) 2200 return (error); 2201 2202 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2203 2204 vrele(nd.ni_vp); 2205 return (error); 2206 } 2207 2208 /* 2209 * Change mode of a file given a file descriptor. 2210 */ 2211 /* ARGSUSED */ 2212 int 2213 sys_fchmod(p, v, retval) 2214 struct proc *p; 2215 void *v; 2216 register_t *retval; 2217 { 2218 struct sys_fchmod_args /* { 2219 syscallarg(int) fd; 2220 syscallarg(int) mode; 2221 } */ *uap = v; 2222 struct file *fp; 2223 int error; 2224 2225 /* getvnode() will use the descriptor for us */ 2226 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2227 return (error); 2228 2229 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2230 FILE_UNUSE(fp, p); 2231 return (error); 2232 } 2233 2234 /* 2235 * Change mode of a file given path name; this version does not follow links. 2236 */ 2237 /* ARGSUSED */ 2238 int 2239 sys_lchmod(p, v, retval) 2240 struct proc *p; 2241 void *v; 2242 register_t *retval; 2243 { 2244 struct sys_lchmod_args /* { 2245 syscallarg(const char *) path; 2246 syscallarg(int) mode; 2247 } */ *uap = v; 2248 int error; 2249 struct nameidata nd; 2250 2251 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2252 if ((error = namei(&nd)) != 0) 2253 return (error); 2254 2255 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2256 2257 vrele(nd.ni_vp); 2258 return (error); 2259 } 2260 2261 /* 2262 * Common routine to set mode given a vnode. 2263 */ 2264 static int 2265 change_mode(vp, mode, p) 2266 struct vnode *vp; 2267 int mode; 2268 struct proc *p; 2269 { 2270 struct vattr vattr; 2271 int error; 2272 2273 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2274 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2275 VATTR_NULL(&vattr); 2276 vattr.va_mode = mode & ALLPERMS; 2277 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2278 VOP_UNLOCK(vp, 0); 2279 return (error); 2280 } 2281 2282 /* 2283 * Set ownership given a path name; this version follows links. 2284 */ 2285 /* ARGSUSED */ 2286 int 2287 sys_chown(p, v, retval) 2288 struct proc *p; 2289 void *v; 2290 register_t *retval; 2291 { 2292 struct sys_chown_args /* { 2293 syscallarg(const char *) path; 2294 syscallarg(uid_t) uid; 2295 syscallarg(gid_t) gid; 2296 } */ *uap = v; 2297 int error; 2298 struct nameidata nd; 2299 2300 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2301 if ((error = namei(&nd)) != 0) 2302 return (error); 2303 2304 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2305 2306 vrele(nd.ni_vp); 2307 return (error); 2308 } 2309 2310 /* 2311 * Set ownership given a path name; this version follows links. 2312 * Provides POSIX semantics. 2313 */ 2314 /* ARGSUSED */ 2315 int 2316 sys___posix_chown(p, v, retval) 2317 struct proc *p; 2318 void *v; 2319 register_t *retval; 2320 { 2321 struct sys_chown_args /* { 2322 syscallarg(const char *) path; 2323 syscallarg(uid_t) uid; 2324 syscallarg(gid_t) gid; 2325 } */ *uap = v; 2326 int error; 2327 struct nameidata nd; 2328 2329 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2330 if ((error = namei(&nd)) != 0) 2331 return (error); 2332 2333 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2334 2335 vrele(nd.ni_vp); 2336 return (error); 2337 } 2338 2339 /* 2340 * Set ownership given a file descriptor. 2341 */ 2342 /* ARGSUSED */ 2343 int 2344 sys_fchown(p, v, retval) 2345 struct proc *p; 2346 void *v; 2347 register_t *retval; 2348 { 2349 struct sys_fchown_args /* { 2350 syscallarg(int) fd; 2351 syscallarg(uid_t) uid; 2352 syscallarg(gid_t) gid; 2353 } */ *uap = v; 2354 int error; 2355 struct file *fp; 2356 2357 /* getvnode() will use the descriptor for us */ 2358 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2359 return (error); 2360 2361 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2362 SCARG(uap, gid), p, 0); 2363 FILE_UNUSE(fp, p); 2364 return (error); 2365 } 2366 2367 /* 2368 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2369 */ 2370 /* ARGSUSED */ 2371 int 2372 sys___posix_fchown(p, v, retval) 2373 struct proc *p; 2374 void *v; 2375 register_t *retval; 2376 { 2377 struct sys_fchown_args /* { 2378 syscallarg(int) fd; 2379 syscallarg(uid_t) uid; 2380 syscallarg(gid_t) gid; 2381 } */ *uap = v; 2382 int error; 2383 struct file *fp; 2384 2385 /* getvnode() will use the descriptor for us */ 2386 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2387 return (error); 2388 2389 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2390 SCARG(uap, gid), p, 1); 2391 FILE_UNUSE(fp, p); 2392 return (error); 2393 } 2394 2395 /* 2396 * Set ownership given a path name; this version does not follow links. 2397 */ 2398 /* ARGSUSED */ 2399 int 2400 sys_lchown(p, v, retval) 2401 struct proc *p; 2402 void *v; 2403 register_t *retval; 2404 { 2405 struct sys_lchown_args /* { 2406 syscallarg(const char *) path; 2407 syscallarg(uid_t) uid; 2408 syscallarg(gid_t) gid; 2409 } */ *uap = v; 2410 int error; 2411 struct nameidata nd; 2412 2413 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2414 if ((error = namei(&nd)) != 0) 2415 return (error); 2416 2417 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2418 2419 vrele(nd.ni_vp); 2420 return (error); 2421 } 2422 2423 /* 2424 * Set ownership given a path name; this version does not follow links. 2425 * Provides POSIX/XPG semantics. 2426 */ 2427 /* ARGSUSED */ 2428 int 2429 sys___posix_lchown(p, v, retval) 2430 struct proc *p; 2431 void *v; 2432 register_t *retval; 2433 { 2434 struct sys_lchown_args /* { 2435 syscallarg(const char *) path; 2436 syscallarg(uid_t) uid; 2437 syscallarg(gid_t) gid; 2438 } */ *uap = v; 2439 int error; 2440 struct nameidata nd; 2441 2442 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2443 if ((error = namei(&nd)) != 0) 2444 return (error); 2445 2446 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2447 2448 vrele(nd.ni_vp); 2449 return (error); 2450 } 2451 2452 /* 2453 * Common routine to set ownership given a vnode. 2454 */ 2455 static int 2456 change_owner(vp, uid, gid, p, posix_semantics) 2457 struct vnode *vp; 2458 uid_t uid; 2459 gid_t gid; 2460 struct proc *p; 2461 int posix_semantics; 2462 { 2463 struct vattr vattr; 2464 mode_t newmode; 2465 int error; 2466 2467 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2468 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2469 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2470 goto out; 2471 2472 #define CHANGED(x) ((x) != -1) 2473 newmode = vattr.va_mode; 2474 if (posix_semantics) { 2475 /* 2476 * POSIX/XPG semantics: if the caller is not the super-user, 2477 * clear set-user-id and set-group-id bits. Both POSIX and 2478 * the XPG consider the behaviour for calls by the super-user 2479 * implementation-defined; we leave the set-user-id and set- 2480 * group-id settings intact in that case. 2481 */ 2482 if (suser(p->p_ucred, NULL) != 0) 2483 newmode &= ~(S_ISUID | S_ISGID); 2484 } else { 2485 /* 2486 * NetBSD semantics: when changing owner and/or group, 2487 * clear the respective bit(s). 2488 */ 2489 if (CHANGED(uid)) 2490 newmode &= ~S_ISUID; 2491 if (CHANGED(gid)) 2492 newmode &= ~S_ISGID; 2493 } 2494 /* Update va_mode iff altered. */ 2495 if (vattr.va_mode == newmode) 2496 newmode = VNOVAL; 2497 2498 VATTR_NULL(&vattr); 2499 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2500 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2501 vattr.va_mode = newmode; 2502 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2503 #undef CHANGED 2504 2505 out: 2506 VOP_UNLOCK(vp, 0); 2507 return (error); 2508 } 2509 2510 /* 2511 * Set the access and modification times given a path name; this 2512 * version follows links. 2513 */ 2514 /* ARGSUSED */ 2515 int 2516 sys_utimes(p, v, retval) 2517 struct proc *p; 2518 void *v; 2519 register_t *retval; 2520 { 2521 struct sys_utimes_args /* { 2522 syscallarg(const char *) path; 2523 syscallarg(const struct timeval *) tptr; 2524 } */ *uap = v; 2525 int error; 2526 struct nameidata nd; 2527 2528 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2529 if ((error = namei(&nd)) != 0) 2530 return (error); 2531 2532 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2533 2534 vrele(nd.ni_vp); 2535 return (error); 2536 } 2537 2538 /* 2539 * Set the access and modification times given a file descriptor. 2540 */ 2541 /* ARGSUSED */ 2542 int 2543 sys_futimes(p, v, retval) 2544 struct proc *p; 2545 void *v; 2546 register_t *retval; 2547 { 2548 struct sys_futimes_args /* { 2549 syscallarg(int) fd; 2550 syscallarg(const struct timeval *) tptr; 2551 } */ *uap = v; 2552 int error; 2553 struct file *fp; 2554 2555 /* getvnode() will use the descriptor for us */ 2556 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2557 return (error); 2558 2559 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2560 FILE_UNUSE(fp, p); 2561 return (error); 2562 } 2563 2564 /* 2565 * Set the access and modification times given a path name; this 2566 * version does not follow links. 2567 */ 2568 /* ARGSUSED */ 2569 int 2570 sys_lutimes(p, v, retval) 2571 struct proc *p; 2572 void *v; 2573 register_t *retval; 2574 { 2575 struct sys_lutimes_args /* { 2576 syscallarg(const char *) path; 2577 syscallarg(const struct timeval *) tptr; 2578 } */ *uap = v; 2579 int error; 2580 struct nameidata nd; 2581 2582 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2583 if ((error = namei(&nd)) != 0) 2584 return (error); 2585 2586 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2587 2588 vrele(nd.ni_vp); 2589 return (error); 2590 } 2591 2592 /* 2593 * Common routine to set access and modification times given a vnode. 2594 */ 2595 static int 2596 change_utimes(vp, tptr, p) 2597 struct vnode *vp; 2598 const struct timeval *tptr; 2599 struct proc *p; 2600 { 2601 struct timeval tv[2]; 2602 struct vattr vattr; 2603 int error; 2604 2605 VATTR_NULL(&vattr); 2606 if (tptr == NULL) { 2607 microtime(&tv[0]); 2608 tv[1] = tv[0]; 2609 vattr.va_vaflags |= VA_UTIMES_NULL; 2610 } else { 2611 error = copyin(tptr, tv, sizeof(tv)); 2612 if (error) 2613 return (error); 2614 } 2615 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2616 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2617 vattr.va_atime.tv_sec = tv[0].tv_sec; 2618 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2619 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2620 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2621 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2622 VOP_UNLOCK(vp, 0); 2623 return (error); 2624 } 2625 2626 /* 2627 * Truncate a file given its path name. 2628 */ 2629 /* ARGSUSED */ 2630 int 2631 sys_truncate(p, v, retval) 2632 struct proc *p; 2633 void *v; 2634 register_t *retval; 2635 { 2636 struct sys_truncate_args /* { 2637 syscallarg(const char *) path; 2638 syscallarg(int) pad; 2639 syscallarg(off_t) length; 2640 } */ *uap = v; 2641 struct vnode *vp; 2642 struct vattr vattr; 2643 int error; 2644 struct nameidata nd; 2645 2646 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2647 if ((error = namei(&nd)) != 0) 2648 return (error); 2649 vp = nd.ni_vp; 2650 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2651 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2652 if (vp->v_type == VDIR) 2653 error = EISDIR; 2654 else if ((error = vn_writechk(vp)) == 0 && 2655 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2656 VATTR_NULL(&vattr); 2657 vattr.va_size = SCARG(uap, length); 2658 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2659 } 2660 vput(vp); 2661 return (error); 2662 } 2663 2664 /* 2665 * Truncate a file given a file descriptor. 2666 */ 2667 /* ARGSUSED */ 2668 int 2669 sys_ftruncate(p, v, retval) 2670 struct proc *p; 2671 void *v; 2672 register_t *retval; 2673 { 2674 struct sys_ftruncate_args /* { 2675 syscallarg(int) fd; 2676 syscallarg(int) pad; 2677 syscallarg(off_t) length; 2678 } */ *uap = v; 2679 struct vattr vattr; 2680 struct vnode *vp; 2681 struct file *fp; 2682 int error; 2683 2684 /* getvnode() will use the descriptor for us */ 2685 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2686 return (error); 2687 if ((fp->f_flag & FWRITE) == 0) { 2688 error = EINVAL; 2689 goto out; 2690 } 2691 vp = (struct vnode *)fp->f_data; 2692 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2693 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2694 if (vp->v_type == VDIR) 2695 error = EISDIR; 2696 else if ((error = vn_writechk(vp)) == 0) { 2697 VATTR_NULL(&vattr); 2698 vattr.va_size = SCARG(uap, length); 2699 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2700 } 2701 VOP_UNLOCK(vp, 0); 2702 out: 2703 FILE_UNUSE(fp, p); 2704 return (error); 2705 } 2706 2707 /* 2708 * Sync an open file. 2709 */ 2710 /* ARGSUSED */ 2711 int 2712 sys_fsync(p, v, retval) 2713 struct proc *p; 2714 void *v; 2715 register_t *retval; 2716 { 2717 struct sys_fsync_args /* { 2718 syscallarg(int) fd; 2719 } */ *uap = v; 2720 struct vnode *vp; 2721 struct file *fp; 2722 int error; 2723 2724 /* getvnode() will use the descriptor for us */ 2725 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2726 return (error); 2727 vp = (struct vnode *)fp->f_data; 2728 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2729 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2730 if (error == 0 && bioops.io_fsync != NULL && 2731 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2732 (*bioops.io_fsync)(vp); 2733 VOP_UNLOCK(vp, 0); 2734 FILE_UNUSE(fp, p); 2735 return (error); 2736 } 2737 2738 /* 2739 * Sync the data of an open file. 2740 */ 2741 /* ARGSUSED */ 2742 int 2743 sys_fdatasync(p, v, retval) 2744 struct proc *p; 2745 void *v; 2746 register_t *retval; 2747 { 2748 struct sys_fdatasync_args /* { 2749 syscallarg(int) fd; 2750 } */ *uap = v; 2751 struct vnode *vp; 2752 struct file *fp; 2753 int error; 2754 2755 /* getvnode() will use the descriptor for us */ 2756 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2757 return (error); 2758 vp = (struct vnode *)fp->f_data; 2759 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2760 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2761 VOP_UNLOCK(vp, 0); 2762 FILE_UNUSE(fp, p); 2763 return (error); 2764 } 2765 2766 /* 2767 * Rename files, (standard) BSD semantics frontend. 2768 */ 2769 /* ARGSUSED */ 2770 int 2771 sys_rename(p, v, retval) 2772 struct proc *p; 2773 void *v; 2774 register_t *retval; 2775 { 2776 struct sys_rename_args /* { 2777 syscallarg(const char *) from; 2778 syscallarg(const char *) to; 2779 } */ *uap = v; 2780 2781 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2782 } 2783 2784 /* 2785 * Rename files, POSIX semantics frontend. 2786 */ 2787 /* ARGSUSED */ 2788 int 2789 sys___posix_rename(p, v, retval) 2790 struct proc *p; 2791 void *v; 2792 register_t *retval; 2793 { 2794 struct sys___posix_rename_args /* { 2795 syscallarg(const char *) from; 2796 syscallarg(const char *) to; 2797 } */ *uap = v; 2798 2799 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2800 } 2801 2802 /* 2803 * Rename files. Source and destination must either both be directories, 2804 * or both not be directories. If target is a directory, it must be empty. 2805 * If `from' and `to' refer to the same object, the value of the `retain' 2806 * argument is used to determine whether `from' will be 2807 * 2808 * (retain == 0) deleted unless `from' and `to' refer to the same 2809 * object in the file system's name space (BSD). 2810 * (retain == 1) always retained (POSIX). 2811 */ 2812 static int 2813 rename_files(from, to, p, retain) 2814 const char *from, *to; 2815 struct proc *p; 2816 int retain; 2817 { 2818 struct vnode *tvp, *fvp, *tdvp; 2819 struct nameidata fromnd, tond; 2820 int error; 2821 2822 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2823 from, p); 2824 if ((error = namei(&fromnd)) != 0) 2825 return (error); 2826 fvp = fromnd.ni_vp; 2827 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2828 UIO_USERSPACE, to, p); 2829 if ((error = namei(&tond)) != 0) { 2830 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2831 vrele(fromnd.ni_dvp); 2832 vrele(fvp); 2833 goto out1; 2834 } 2835 tdvp = tond.ni_dvp; 2836 tvp = tond.ni_vp; 2837 2838 if (tvp != NULL) { 2839 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2840 error = ENOTDIR; 2841 goto out; 2842 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2843 error = EISDIR; 2844 goto out; 2845 } 2846 } 2847 2848 if (fvp == tdvp) 2849 error = EINVAL; 2850 2851 /* 2852 * Source and destination refer to the same object. 2853 */ 2854 if (fvp == tvp) { 2855 if (retain) 2856 error = -1; 2857 else if (fromnd.ni_dvp == tdvp && 2858 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2859 !memcmp(fromnd.ni_cnd.cn_nameptr, 2860 tond.ni_cnd.cn_nameptr, 2861 fromnd.ni_cnd.cn_namelen)) 2862 error = -1; 2863 } 2864 2865 out: 2866 if (!error) { 2867 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2868 if (fromnd.ni_dvp != tdvp) 2869 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2870 if (tvp) { 2871 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2872 } 2873 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2874 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2875 } else { 2876 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2877 if (tdvp == tvp) 2878 vrele(tdvp); 2879 else 2880 vput(tdvp); 2881 if (tvp) 2882 vput(tvp); 2883 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2884 vrele(fromnd.ni_dvp); 2885 vrele(fvp); 2886 } 2887 vrele(tond.ni_startdir); 2888 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2889 out1: 2890 if (fromnd.ni_startdir) 2891 vrele(fromnd.ni_startdir); 2892 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2893 return (error == -1 ? 0 : error); 2894 } 2895 2896 /* 2897 * Make a directory file. 2898 */ 2899 /* ARGSUSED */ 2900 int 2901 sys_mkdir(p, v, retval) 2902 struct proc *p; 2903 void *v; 2904 register_t *retval; 2905 { 2906 struct sys_mkdir_args /* { 2907 syscallarg(const char *) path; 2908 syscallarg(int) mode; 2909 } */ *uap = v; 2910 struct vnode *vp; 2911 struct vattr vattr; 2912 int error; 2913 struct nameidata nd; 2914 2915 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2916 if ((error = namei(&nd)) != 0) 2917 return (error); 2918 vp = nd.ni_vp; 2919 if (vp != NULL) { 2920 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2921 if (nd.ni_dvp == vp) 2922 vrele(nd.ni_dvp); 2923 else 2924 vput(nd.ni_dvp); 2925 vrele(vp); 2926 return (EEXIST); 2927 } 2928 VATTR_NULL(&vattr); 2929 vattr.va_type = VDIR; 2930 vattr.va_mode = 2931 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2932 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2933 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2934 if (!error) 2935 vput(nd.ni_vp); 2936 return (error); 2937 } 2938 2939 /* 2940 * Remove a directory file. 2941 */ 2942 /* ARGSUSED */ 2943 int 2944 sys_rmdir(p, v, retval) 2945 struct proc *p; 2946 void *v; 2947 register_t *retval; 2948 { 2949 struct sys_rmdir_args /* { 2950 syscallarg(const char *) path; 2951 } */ *uap = v; 2952 struct vnode *vp; 2953 int error; 2954 struct nameidata nd; 2955 2956 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2957 SCARG(uap, path), p); 2958 if ((error = namei(&nd)) != 0) 2959 return (error); 2960 vp = nd.ni_vp; 2961 if (vp->v_type != VDIR) { 2962 error = ENOTDIR; 2963 goto out; 2964 } 2965 /* 2966 * No rmdir "." please. 2967 */ 2968 if (nd.ni_dvp == vp) { 2969 error = EINVAL; 2970 goto out; 2971 } 2972 /* 2973 * The root of a mounted filesystem cannot be deleted. 2974 */ 2975 if (vp->v_flag & VROOT) 2976 error = EBUSY; 2977 out: 2978 if (!error) { 2979 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2980 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2981 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2982 } else { 2983 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2984 if (nd.ni_dvp == vp) 2985 vrele(nd.ni_dvp); 2986 else 2987 vput(nd.ni_dvp); 2988 vput(vp); 2989 } 2990 return (error); 2991 } 2992 2993 /* 2994 * Read a block of directory entries in a file system independent format. 2995 */ 2996 int 2997 sys_getdents(p, v, retval) 2998 struct proc *p; 2999 void *v; 3000 register_t *retval; 3001 { 3002 struct sys_getdents_args /* { 3003 syscallarg(int) fd; 3004 syscallarg(char *) buf; 3005 syscallarg(size_t) count; 3006 } */ *uap = v; 3007 struct file *fp; 3008 int error, done; 3009 3010 /* getvnode() will use the descriptor for us */ 3011 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3012 return (error); 3013 if ((fp->f_flag & FREAD) == 0) { 3014 error = EBADF; 3015 goto out; 3016 } 3017 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3018 SCARG(uap, count), &done, p, 0, 0); 3019 *retval = done; 3020 out: 3021 FILE_UNUSE(fp, p); 3022 return (error); 3023 } 3024 3025 /* 3026 * Set the mode mask for creation of filesystem nodes. 3027 */ 3028 int 3029 sys_umask(p, v, retval) 3030 struct proc *p; 3031 void *v; 3032 register_t *retval; 3033 { 3034 struct sys_umask_args /* { 3035 syscallarg(mode_t) newmask; 3036 } */ *uap = v; 3037 struct cwdinfo *cwdi; 3038 3039 cwdi = p->p_cwdi; 3040 *retval = cwdi->cwdi_cmask; 3041 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3042 return (0); 3043 } 3044 3045 /* 3046 * Void all references to file by ripping underlying filesystem 3047 * away from vnode. 3048 */ 3049 /* ARGSUSED */ 3050 int 3051 sys_revoke(p, v, retval) 3052 struct proc *p; 3053 void *v; 3054 register_t *retval; 3055 { 3056 struct sys_revoke_args /* { 3057 syscallarg(const char *) path; 3058 } */ *uap = v; 3059 struct vnode *vp; 3060 struct vattr vattr; 3061 int error; 3062 struct nameidata nd; 3063 3064 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3065 if ((error = namei(&nd)) != 0) 3066 return (error); 3067 vp = nd.ni_vp; 3068 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3069 goto out; 3070 if (p->p_ucred->cr_uid != vattr.va_uid && 3071 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3072 goto out; 3073 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3074 VOP_REVOKE(vp, REVOKEALL); 3075 out: 3076 vrele(vp); 3077 return (error); 3078 } 3079 3080 /* 3081 * Convert a user file descriptor to a kernel file entry. 3082 */ 3083 int 3084 getvnode(fdp, fd, fpp) 3085 struct filedesc *fdp; 3086 int fd; 3087 struct file **fpp; 3088 { 3089 struct vnode *vp; 3090 struct file *fp; 3091 3092 if ((fp = fd_getfile(fdp, fd)) == NULL) 3093 return (EBADF); 3094 3095 FILE_USE(fp); 3096 3097 if (fp->f_type != DTYPE_VNODE) { 3098 FILE_UNUSE(fp, NULL); 3099 return (EINVAL); 3100 } 3101 3102 vp = (struct vnode *)fp->f_data; 3103 if (vp->v_type == VBAD) { 3104 FILE_UNUSE(fp, NULL); 3105 return (EBADF); 3106 } 3107 3108 *fpp = fp; 3109 return (0); 3110 } 3111
Indexes created Fri Sep 26 20:09:58 GMT 2025