vfs_syscalls.c revision 1.168.2.1
1 /* $NetBSD: vfs_syscalls.c,v 1.168.2.1 2001/09/18 19:13:54 fvdl 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, *vp2; 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 vp2 = NULL; 1190 if ((error = VOP_OPEN(vp, flags, cred, p, &vp2)) != 0) 1191 goto bad; 1192 if (vp2 != NULL) { 1193 vput(vp); 1194 vp = vp2; 1195 } 1196 1197 if (vp->v_type == VREG && 1198 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1199 error = EIO; 1200 goto bad; 1201 } 1202 if (flags & FWRITE) 1203 vp->v_writecount++; 1204 1205 /* done with modified vn_open, now finish what sys_open does. */ 1206 1207 fp->f_flag = flags & FMASK; 1208 fp->f_type = DTYPE_VNODE; 1209 fp->f_ops = &vnops; 1210 fp->f_data = (caddr_t)vp; 1211 if (flags & (O_EXLOCK | O_SHLOCK)) { 1212 lf.l_whence = SEEK_SET; 1213 lf.l_start = 0; 1214 lf.l_len = 0; 1215 if (flags & O_EXLOCK) 1216 lf.l_type = F_WRLCK; 1217 else 1218 lf.l_type = F_RDLCK; 1219 type = F_FLOCK; 1220 if ((flags & FNONBLOCK) == 0) 1221 type |= F_WAIT; 1222 VOP_UNLOCK(vp, 0); 1223 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1224 if (error) { 1225 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1226 FILE_UNUSE(fp, p); 1227 ffree(fp); 1228 fdremove(fdp, indx); 1229 return (error); 1230 } 1231 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1232 fp->f_flag |= FHASLOCK; 1233 } 1234 VOP_UNLOCK(vp, 0); 1235 *retval = indx; 1236 FILE_SET_MATURE(fp); 1237 FILE_UNUSE(fp, p); 1238 return (0); 1239 1240 bad: 1241 FILE_UNUSE(fp, p); 1242 ffree(fp); 1243 fdremove(fdp, indx); 1244 if (vp != NULL) 1245 vput(vp); 1246 return (error); 1247 } 1248 1249 /* ARGSUSED */ 1250 int 1251 sys_fhstat(p, v, retval) 1252 struct proc *p; 1253 void *v; 1254 register_t *retval; 1255 { 1256 struct sys_fhstat_args /* { 1257 syscallarg(const fhandle_t *) fhp; 1258 syscallarg(struct stat *) sb; 1259 } */ *uap = v; 1260 struct stat sb; 1261 int error; 1262 fhandle_t fh; 1263 struct mount *mp; 1264 struct vnode *vp; 1265 1266 /* 1267 * Must be super user 1268 */ 1269 if ((error = suser(p->p_ucred, &p->p_acflag))) 1270 return (error); 1271 1272 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1273 return (error); 1274 1275 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1276 return (ESTALE); 1277 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1278 return (error); 1279 error = vn_stat(vp, &sb, p); 1280 vput(vp); 1281 if (error) 1282 return (error); 1283 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1284 return (error); 1285 } 1286 1287 /* ARGSUSED */ 1288 int 1289 sys_fhstatfs(p, v, retval) 1290 struct proc *p; 1291 void *v; 1292 register_t *retval; 1293 { 1294 struct sys_fhstatfs_args /* 1295 syscallarg(const fhandle_t *) fhp; 1296 syscallarg(struct statfs *) buf; 1297 } */ *uap = v; 1298 struct statfs sp; 1299 fhandle_t fh; 1300 struct mount *mp; 1301 struct vnode *vp; 1302 int error; 1303 1304 /* 1305 * Must be super user 1306 */ 1307 if ((error = suser(p->p_ucred, &p->p_acflag))) 1308 return (error); 1309 1310 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1311 return (error); 1312 1313 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1314 return (ESTALE); 1315 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1316 return (error); 1317 mp = vp->v_mount; 1318 vput(vp); 1319 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1320 return (error); 1321 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1322 sp.f_oflags = sp.f_flags & 0xffff; 1323 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1324 } 1325 1326 /* 1327 * Create a special file. 1328 */ 1329 /* ARGSUSED */ 1330 int 1331 sys_mknod(p, v, retval) 1332 struct proc *p; 1333 void *v; 1334 register_t *retval; 1335 { 1336 struct sys_mknod_args /* { 1337 syscallarg(const char *) path; 1338 syscallarg(int) mode; 1339 syscallarg(int) dev; 1340 } */ *uap = v; 1341 struct vnode *vp; 1342 struct vattr vattr; 1343 int error; 1344 int whiteout = 0; 1345 struct nameidata nd; 1346 1347 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1348 return (error); 1349 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1350 if ((error = namei(&nd)) != 0) 1351 return (error); 1352 vp = nd.ni_vp; 1353 if (vp != NULL) 1354 error = EEXIST; 1355 else { 1356 VATTR_NULL(&vattr); 1357 vattr.va_mode = 1358 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1359 vattr.va_rdev = SCARG(uap, dev); 1360 whiteout = 0; 1361 1362 switch (SCARG(uap, mode) & S_IFMT) { 1363 case S_IFMT: /* used by badsect to flag bad sectors */ 1364 vattr.va_type = VBAD; 1365 break; 1366 case S_IFCHR: 1367 vattr.va_type = VCHR; 1368 break; 1369 case S_IFBLK: 1370 vattr.va_type = VBLK; 1371 break; 1372 case S_IFWHT: 1373 whiteout = 1; 1374 break; 1375 default: 1376 error = EINVAL; 1377 break; 1378 } 1379 } 1380 if (!error) { 1381 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1382 if (whiteout) { 1383 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1384 if (error) 1385 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1386 vput(nd.ni_dvp); 1387 } else { 1388 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1389 &nd.ni_cnd, &vattr); 1390 if (error == 0) 1391 vput(nd.ni_vp); 1392 } 1393 } else { 1394 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1395 if (nd.ni_dvp == vp) 1396 vrele(nd.ni_dvp); 1397 else 1398 vput(nd.ni_dvp); 1399 if (vp) 1400 vrele(vp); 1401 } 1402 return (error); 1403 } 1404 1405 /* 1406 * Create a named pipe. 1407 */ 1408 /* ARGSUSED */ 1409 int 1410 sys_mkfifo(p, v, retval) 1411 struct proc *p; 1412 void *v; 1413 register_t *retval; 1414 { 1415 struct sys_mkfifo_args /* { 1416 syscallarg(const char *) path; 1417 syscallarg(int) mode; 1418 } */ *uap = v; 1419 struct vattr vattr; 1420 int error; 1421 struct nameidata nd; 1422 1423 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1424 if ((error = namei(&nd)) != 0) 1425 return (error); 1426 if (nd.ni_vp != NULL) { 1427 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1428 if (nd.ni_dvp == nd.ni_vp) 1429 vrele(nd.ni_dvp); 1430 else 1431 vput(nd.ni_dvp); 1432 vrele(nd.ni_vp); 1433 return (EEXIST); 1434 } 1435 VATTR_NULL(&vattr); 1436 vattr.va_type = VFIFO; 1437 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1438 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1439 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1440 if (error == 0) 1441 vput(nd.ni_vp); 1442 return (error); 1443 } 1444 1445 /* 1446 * Make a hard file link. 1447 */ 1448 /* ARGSUSED */ 1449 int 1450 sys_link(p, v, retval) 1451 struct proc *p; 1452 void *v; 1453 register_t *retval; 1454 { 1455 struct sys_link_args /* { 1456 syscallarg(const char *) path; 1457 syscallarg(const char *) link; 1458 } */ *uap = v; 1459 struct vnode *vp; 1460 struct nameidata nd; 1461 int error; 1462 1463 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1464 if ((error = namei(&nd)) != 0) 1465 return (error); 1466 vp = nd.ni_vp; 1467 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1468 if ((error = namei(&nd)) != 0) 1469 goto out; 1470 if (nd.ni_vp) { 1471 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1472 if (nd.ni_dvp == nd.ni_vp) 1473 vrele(nd.ni_dvp); 1474 else 1475 vput(nd.ni_dvp); 1476 vrele(nd.ni_vp); 1477 error = EEXIST; 1478 goto out; 1479 } 1480 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1481 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1482 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1483 out: 1484 vrele(vp); 1485 return (error); 1486 } 1487 1488 /* 1489 * Make a symbolic link. 1490 */ 1491 /* ARGSUSED */ 1492 int 1493 sys_symlink(p, v, retval) 1494 struct proc *p; 1495 void *v; 1496 register_t *retval; 1497 { 1498 struct sys_symlink_args /* { 1499 syscallarg(const char *) path; 1500 syscallarg(const char *) link; 1501 } */ *uap = v; 1502 struct vattr vattr; 1503 char *path; 1504 int error; 1505 struct nameidata nd; 1506 1507 path = PNBUF_GET(); 1508 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1509 if (error) 1510 goto out; 1511 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1512 if ((error = namei(&nd)) != 0) 1513 goto out; 1514 if (nd.ni_vp) { 1515 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1516 if (nd.ni_dvp == nd.ni_vp) 1517 vrele(nd.ni_dvp); 1518 else 1519 vput(nd.ni_dvp); 1520 vrele(nd.ni_vp); 1521 error = EEXIST; 1522 goto out; 1523 } 1524 VATTR_NULL(&vattr); 1525 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1526 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1527 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1528 if (error == 0) 1529 vput(nd.ni_vp); 1530 out: 1531 PNBUF_PUT(path); 1532 return (error); 1533 } 1534 1535 /* 1536 * Delete a whiteout from the filesystem. 1537 */ 1538 /* ARGSUSED */ 1539 int 1540 sys_undelete(p, v, retval) 1541 struct proc *p; 1542 void *v; 1543 register_t *retval; 1544 { 1545 struct sys_undelete_args /* { 1546 syscallarg(const char *) path; 1547 } */ *uap = v; 1548 int error; 1549 struct nameidata nd; 1550 1551 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1552 SCARG(uap, path), p); 1553 error = namei(&nd); 1554 if (error) 1555 return (error); 1556 1557 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1558 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1559 if (nd.ni_dvp == nd.ni_vp) 1560 vrele(nd.ni_dvp); 1561 else 1562 vput(nd.ni_dvp); 1563 if (nd.ni_vp) 1564 vrele(nd.ni_vp); 1565 return (EEXIST); 1566 } 1567 1568 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1569 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1570 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1571 vput(nd.ni_dvp); 1572 return (error); 1573 } 1574 1575 /* 1576 * Delete a name from the filesystem. 1577 */ 1578 /* ARGSUSED */ 1579 int 1580 sys_unlink(p, v, retval) 1581 struct proc *p; 1582 void *v; 1583 register_t *retval; 1584 { 1585 struct sys_unlink_args /* { 1586 syscallarg(const char *) path; 1587 } */ *uap = v; 1588 struct vnode *vp; 1589 int error; 1590 struct nameidata nd; 1591 1592 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1593 SCARG(uap, path), p); 1594 if ((error = namei(&nd)) != 0) 1595 return (error); 1596 vp = nd.ni_vp; 1597 1598 /* 1599 * The root of a mounted filesystem cannot be deleted. 1600 */ 1601 if (vp->v_flag & VROOT) { 1602 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1603 if (nd.ni_dvp == vp) 1604 vrele(nd.ni_dvp); 1605 else 1606 vput(nd.ni_dvp); 1607 vput(vp); 1608 error = EBUSY; 1609 goto out; 1610 } 1611 1612 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1613 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1614 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1615 out: 1616 return (error); 1617 } 1618 1619 /* 1620 * Reposition read/write file offset. 1621 */ 1622 int 1623 sys_lseek(p, v, retval) 1624 struct proc *p; 1625 void *v; 1626 register_t *retval; 1627 { 1628 struct sys_lseek_args /* { 1629 syscallarg(int) fd; 1630 syscallarg(int) pad; 1631 syscallarg(off_t) offset; 1632 syscallarg(int) whence; 1633 } */ *uap = v; 1634 struct ucred *cred = p->p_ucred; 1635 struct filedesc *fdp = p->p_fd; 1636 struct file *fp; 1637 struct vnode *vp; 1638 struct vattr vattr; 1639 off_t newoff; 1640 int error; 1641 1642 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1643 return (EBADF); 1644 1645 FILE_USE(fp); 1646 1647 vp = (struct vnode *)fp->f_data; 1648 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1649 error = ESPIPE; 1650 goto out; 1651 } 1652 1653 switch (SCARG(uap, whence)) { 1654 case SEEK_CUR: 1655 newoff = fp->f_offset + SCARG(uap, offset); 1656 break; 1657 case SEEK_END: 1658 error = VOP_GETATTR(vp, &vattr, cred, p); 1659 if (error) 1660 goto out; 1661 newoff = SCARG(uap, offset) + vattr.va_size; 1662 break; 1663 case SEEK_SET: 1664 newoff = SCARG(uap, offset); 1665 break; 1666 default: 1667 error = EINVAL; 1668 goto out; 1669 } 1670 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1671 goto out; 1672 1673 *(off_t *)retval = fp->f_offset = newoff; 1674 out: 1675 FILE_UNUSE(fp, p); 1676 return (error); 1677 } 1678 1679 /* 1680 * Positional read system call. 1681 */ 1682 int 1683 sys_pread(p, v, retval) 1684 struct proc *p; 1685 void *v; 1686 register_t *retval; 1687 { 1688 struct sys_pread_args /* { 1689 syscallarg(int) fd; 1690 syscallarg(void *) buf; 1691 syscallarg(size_t) nbyte; 1692 syscallarg(off_t) offset; 1693 } */ *uap = v; 1694 struct filedesc *fdp = p->p_fd; 1695 struct file *fp; 1696 struct vnode *vp; 1697 off_t offset; 1698 int error, fd = SCARG(uap, fd); 1699 1700 if ((fp = fd_getfile(fdp, fd)) == NULL) 1701 return (EBADF); 1702 1703 if ((fp->f_flag & FREAD) == 0) 1704 return (EBADF); 1705 1706 FILE_USE(fp); 1707 1708 vp = (struct vnode *)fp->f_data; 1709 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1710 error = ESPIPE; 1711 goto out; 1712 } 1713 1714 offset = SCARG(uap, offset); 1715 1716 /* 1717 * XXX This works because no file systems actually 1718 * XXX take any action on the seek operation. 1719 */ 1720 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1721 goto out; 1722 1723 /* dofileread() will unuse the descriptor for us */ 1724 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1725 &offset, 0, retval)); 1726 1727 out: 1728 FILE_UNUSE(fp, p); 1729 return (error); 1730 } 1731 1732 /* 1733 * Positional scatter read system call. 1734 */ 1735 int 1736 sys_preadv(p, v, retval) 1737 struct proc *p; 1738 void *v; 1739 register_t *retval; 1740 { 1741 struct sys_preadv_args /* { 1742 syscallarg(int) fd; 1743 syscallarg(const struct iovec *) iovp; 1744 syscallarg(int) iovcnt; 1745 syscallarg(off_t) offset; 1746 } */ *uap = v; 1747 struct filedesc *fdp = p->p_fd; 1748 struct file *fp; 1749 struct vnode *vp; 1750 off_t offset; 1751 int error, fd = SCARG(uap, fd); 1752 1753 if ((fp = fd_getfile(fdp, fd)) == NULL) 1754 return (EBADF); 1755 1756 if ((fp->f_flag & FREAD) == 0) 1757 return (EBADF); 1758 1759 FILE_USE(fp); 1760 1761 vp = (struct vnode *)fp->f_data; 1762 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1763 error = ESPIPE; 1764 goto out; 1765 } 1766 1767 offset = SCARG(uap, offset); 1768 1769 /* 1770 * XXX This works because no file systems actually 1771 * XXX take any action on the seek operation. 1772 */ 1773 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1774 goto out; 1775 1776 /* dofilereadv() will unuse the descriptor for us */ 1777 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1778 &offset, 0, retval)); 1779 1780 out: 1781 FILE_UNUSE(fp, p); 1782 return (error); 1783 } 1784 1785 /* 1786 * Positional write system call. 1787 */ 1788 int 1789 sys_pwrite(p, v, retval) 1790 struct proc *p; 1791 void *v; 1792 register_t *retval; 1793 { 1794 struct sys_pwrite_args /* { 1795 syscallarg(int) fd; 1796 syscallarg(const void *) buf; 1797 syscallarg(size_t) nbyte; 1798 syscallarg(off_t) offset; 1799 } */ *uap = v; 1800 struct filedesc *fdp = p->p_fd; 1801 struct file *fp; 1802 struct vnode *vp; 1803 off_t offset; 1804 int error, fd = SCARG(uap, fd); 1805 1806 if ((fp = fd_getfile(fdp, fd)) == NULL) 1807 return (EBADF); 1808 1809 if ((fp->f_flag & FWRITE) == 0) 1810 return (EBADF); 1811 1812 FILE_USE(fp); 1813 1814 vp = (struct vnode *)fp->f_data; 1815 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1816 error = ESPIPE; 1817 goto out; 1818 } 1819 1820 offset = SCARG(uap, offset); 1821 1822 /* 1823 * XXX This works because no file systems actually 1824 * XXX take any action on the seek operation. 1825 */ 1826 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1827 goto out; 1828 1829 /* dofilewrite() will unuse the descriptor for us */ 1830 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1831 &offset, 0, retval)); 1832 1833 out: 1834 FILE_UNUSE(fp, p); 1835 return (error); 1836 } 1837 1838 /* 1839 * Positional gather write system call. 1840 */ 1841 int 1842 sys_pwritev(p, v, retval) 1843 struct proc *p; 1844 void *v; 1845 register_t *retval; 1846 { 1847 struct sys_pwritev_args /* { 1848 syscallarg(int) fd; 1849 syscallarg(const struct iovec *) iovp; 1850 syscallarg(int) iovcnt; 1851 syscallarg(off_t) offset; 1852 } */ *uap = v; 1853 struct filedesc *fdp = p->p_fd; 1854 struct file *fp; 1855 struct vnode *vp; 1856 off_t offset; 1857 int error, fd = SCARG(uap, fd); 1858 1859 if ((fp = fd_getfile(fdp, fd)) == NULL) 1860 return (EBADF); 1861 1862 if ((fp->f_flag & FWRITE) == 0) 1863 return (EBADF); 1864 1865 FILE_USE(fp); 1866 1867 vp = (struct vnode *)fp->f_data; 1868 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1869 error = ESPIPE; 1870 goto out; 1871 } 1872 1873 offset = SCARG(uap, offset); 1874 1875 /* 1876 * XXX This works because no file systems actually 1877 * XXX take any action on the seek operation. 1878 */ 1879 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1880 goto out; 1881 1882 /* dofilewritev() will unuse the descriptor for us */ 1883 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1884 &offset, 0, retval)); 1885 1886 out: 1887 FILE_UNUSE(fp, p); 1888 return (error); 1889 } 1890 1891 /* 1892 * Check access permissions. 1893 */ 1894 int 1895 sys_access(p, v, retval) 1896 struct proc *p; 1897 void *v; 1898 register_t *retval; 1899 { 1900 struct sys_access_args /* { 1901 syscallarg(const char *) path; 1902 syscallarg(int) flags; 1903 } */ *uap = v; 1904 struct ucred *cred = p->p_ucred; 1905 struct vnode *vp; 1906 int error, flags, t_gid, t_uid; 1907 struct nameidata nd; 1908 1909 t_uid = cred->cr_uid; 1910 t_gid = cred->cr_gid; 1911 cred->cr_uid = p->p_cred->p_ruid; 1912 cred->cr_gid = p->p_cred->p_rgid; 1913 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1914 SCARG(uap, path), p); 1915 if ((error = namei(&nd)) != 0) 1916 goto out1; 1917 vp = nd.ni_vp; 1918 1919 /* Flags == 0 means only check for existence. */ 1920 if (SCARG(uap, flags)) { 1921 flags = 0; 1922 if (SCARG(uap, flags) & R_OK) 1923 flags |= VREAD; 1924 if (SCARG(uap, flags) & W_OK) 1925 flags |= VWRITE; 1926 if (SCARG(uap, flags) & X_OK) 1927 flags |= VEXEC; 1928 1929 error = VOP_ACCESS(vp, flags, cred, p); 1930 if (!error && (flags & VWRITE)) 1931 error = vn_writechk(vp); 1932 } 1933 vput(vp); 1934 out1: 1935 cred->cr_uid = t_uid; 1936 cred->cr_gid = t_gid; 1937 return (error); 1938 } 1939 1940 /* 1941 * Get file status; this version follows links. 1942 */ 1943 /* ARGSUSED */ 1944 int 1945 sys___stat13(p, v, retval) 1946 struct proc *p; 1947 void *v; 1948 register_t *retval; 1949 { 1950 struct sys___stat13_args /* { 1951 syscallarg(const char *) path; 1952 syscallarg(struct stat *) ub; 1953 } */ *uap = v; 1954 struct stat sb; 1955 int error; 1956 struct nameidata nd; 1957 1958 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1959 SCARG(uap, path), p); 1960 if ((error = namei(&nd)) != 0) 1961 return (error); 1962 error = vn_stat(nd.ni_vp, &sb, p); 1963 vput(nd.ni_vp); 1964 if (error) 1965 return (error); 1966 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1967 return (error); 1968 } 1969 1970 /* 1971 * Get file status; this version does not follow links. 1972 */ 1973 /* ARGSUSED */ 1974 int 1975 sys___lstat13(p, v, retval) 1976 struct proc *p; 1977 void *v; 1978 register_t *retval; 1979 { 1980 struct sys___lstat13_args /* { 1981 syscallarg(const char *) path; 1982 syscallarg(struct stat *) ub; 1983 } */ *uap = v; 1984 struct stat sb; 1985 int error; 1986 struct nameidata nd; 1987 1988 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1989 SCARG(uap, path), p); 1990 if ((error = namei(&nd)) != 0) 1991 return (error); 1992 error = vn_stat(nd.ni_vp, &sb, p); 1993 vput(nd.ni_vp); 1994 if (error) 1995 return (error); 1996 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1997 return (error); 1998 } 1999 2000 /* 2001 * Get configurable pathname variables. 2002 */ 2003 /* ARGSUSED */ 2004 int 2005 sys_pathconf(p, v, retval) 2006 struct proc *p; 2007 void *v; 2008 register_t *retval; 2009 { 2010 struct sys_pathconf_args /* { 2011 syscallarg(const char *) path; 2012 syscallarg(int) name; 2013 } */ *uap = v; 2014 int error; 2015 struct nameidata nd; 2016 2017 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2018 SCARG(uap, path), p); 2019 if ((error = namei(&nd)) != 0) 2020 return (error); 2021 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2022 vput(nd.ni_vp); 2023 return (error); 2024 } 2025 2026 /* 2027 * Return target name of a symbolic link. 2028 */ 2029 /* ARGSUSED */ 2030 int 2031 sys_readlink(p, v, retval) 2032 struct proc *p; 2033 void *v; 2034 register_t *retval; 2035 { 2036 struct sys_readlink_args /* { 2037 syscallarg(const char *) path; 2038 syscallarg(char *) buf; 2039 syscallarg(size_t) count; 2040 } */ *uap = v; 2041 struct vnode *vp; 2042 struct iovec aiov; 2043 struct uio auio; 2044 int error; 2045 struct nameidata nd; 2046 2047 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2048 SCARG(uap, path), p); 2049 if ((error = namei(&nd)) != 0) 2050 return (error); 2051 vp = nd.ni_vp; 2052 if (vp->v_type != VLNK) 2053 error = EINVAL; 2054 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2055 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2056 aiov.iov_base = SCARG(uap, buf); 2057 aiov.iov_len = SCARG(uap, count); 2058 auio.uio_iov = &aiov; 2059 auio.uio_iovcnt = 1; 2060 auio.uio_offset = 0; 2061 auio.uio_rw = UIO_READ; 2062 auio.uio_segflg = UIO_USERSPACE; 2063 auio.uio_procp = p; 2064 auio.uio_resid = SCARG(uap, count); 2065 error = VOP_READLINK(vp, &auio, p->p_ucred); 2066 } 2067 vput(vp); 2068 *retval = SCARG(uap, count) - auio.uio_resid; 2069 return (error); 2070 } 2071 2072 /* 2073 * Change flags of a file given a path name. 2074 */ 2075 /* ARGSUSED */ 2076 int 2077 sys_chflags(p, v, retval) 2078 struct proc *p; 2079 void *v; 2080 register_t *retval; 2081 { 2082 struct sys_chflags_args /* { 2083 syscallarg(const char *) path; 2084 syscallarg(u_long) flags; 2085 } */ *uap = v; 2086 struct vnode *vp; 2087 int error; 2088 struct nameidata nd; 2089 2090 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2091 if ((error = namei(&nd)) != 0) 2092 return (error); 2093 vp = nd.ni_vp; 2094 error = change_flags(vp, SCARG(uap, flags), p); 2095 vput(vp); 2096 return (error); 2097 } 2098 2099 /* 2100 * Change flags of a file given a file descriptor. 2101 */ 2102 /* ARGSUSED */ 2103 int 2104 sys_fchflags(p, v, retval) 2105 struct proc *p; 2106 void *v; 2107 register_t *retval; 2108 { 2109 struct sys_fchflags_args /* { 2110 syscallarg(int) fd; 2111 syscallarg(u_long) flags; 2112 } */ *uap = v; 2113 struct vnode *vp; 2114 struct file *fp; 2115 int error; 2116 2117 /* getvnode() will use the descriptor for us */ 2118 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2119 return (error); 2120 vp = (struct vnode *)fp->f_data; 2121 error = change_flags(vp, SCARG(uap, flags), p); 2122 VOP_UNLOCK(vp, 0); 2123 FILE_UNUSE(fp, p); 2124 return (error); 2125 } 2126 2127 /* 2128 * Change flags of a file given a path name; this version does 2129 * not follow links. 2130 */ 2131 int 2132 sys_lchflags(p, v, retval) 2133 struct proc *p; 2134 void *v; 2135 register_t *retval; 2136 { 2137 struct sys_lchflags_args /* { 2138 syscallarg(const char *) path; 2139 syscallarg(u_long) flags; 2140 } */ *uap = v; 2141 struct vnode *vp; 2142 int error; 2143 struct nameidata nd; 2144 2145 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2146 if ((error = namei(&nd)) != 0) 2147 return (error); 2148 vp = nd.ni_vp; 2149 error = change_flags(vp, SCARG(uap, flags), p); 2150 vput(vp); 2151 return (error); 2152 } 2153 2154 /* 2155 * Common routine to change flags of a file. 2156 */ 2157 int 2158 change_flags(vp, flags, p) 2159 struct vnode *vp; 2160 u_long flags; 2161 struct proc *p; 2162 { 2163 struct vattr vattr; 2164 int error; 2165 2166 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2167 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2168 /* 2169 * Non-superusers cannot change the flags on devices, even if they 2170 * own them. 2171 */ 2172 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2173 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2174 goto out; 2175 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2176 error = EINVAL; 2177 goto out; 2178 } 2179 } 2180 VATTR_NULL(&vattr); 2181 vattr.va_flags = flags; 2182 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2183 out: 2184 return (error); 2185 } 2186 2187 /* 2188 * Change mode of a file given path name; this version follows links. 2189 */ 2190 /* ARGSUSED */ 2191 int 2192 sys_chmod(p, v, retval) 2193 struct proc *p; 2194 void *v; 2195 register_t *retval; 2196 { 2197 struct sys_chmod_args /* { 2198 syscallarg(const char *) path; 2199 syscallarg(int) mode; 2200 } */ *uap = v; 2201 int error; 2202 struct nameidata nd; 2203 2204 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2205 if ((error = namei(&nd)) != 0) 2206 return (error); 2207 2208 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2209 2210 vrele(nd.ni_vp); 2211 return (error); 2212 } 2213 2214 /* 2215 * Change mode of a file given a file descriptor. 2216 */ 2217 /* ARGSUSED */ 2218 int 2219 sys_fchmod(p, v, retval) 2220 struct proc *p; 2221 void *v; 2222 register_t *retval; 2223 { 2224 struct sys_fchmod_args /* { 2225 syscallarg(int) fd; 2226 syscallarg(int) mode; 2227 } */ *uap = v; 2228 struct file *fp; 2229 int error; 2230 2231 /* getvnode() will use the descriptor for us */ 2232 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2233 return (error); 2234 2235 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2236 FILE_UNUSE(fp, p); 2237 return (error); 2238 } 2239 2240 /* 2241 * Change mode of a file given path name; this version does not follow links. 2242 */ 2243 /* ARGSUSED */ 2244 int 2245 sys_lchmod(p, v, retval) 2246 struct proc *p; 2247 void *v; 2248 register_t *retval; 2249 { 2250 struct sys_lchmod_args /* { 2251 syscallarg(const char *) path; 2252 syscallarg(int) mode; 2253 } */ *uap = v; 2254 int error; 2255 struct nameidata nd; 2256 2257 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2258 if ((error = namei(&nd)) != 0) 2259 return (error); 2260 2261 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2262 2263 vrele(nd.ni_vp); 2264 return (error); 2265 } 2266 2267 /* 2268 * Common routine to set mode given a vnode. 2269 */ 2270 static int 2271 change_mode(vp, mode, p) 2272 struct vnode *vp; 2273 int mode; 2274 struct proc *p; 2275 { 2276 struct vattr vattr; 2277 int error; 2278 2279 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2280 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2281 VATTR_NULL(&vattr); 2282 vattr.va_mode = mode & ALLPERMS; 2283 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2284 VOP_UNLOCK(vp, 0); 2285 return (error); 2286 } 2287 2288 /* 2289 * Set ownership given a path name; this version follows links. 2290 */ 2291 /* ARGSUSED */ 2292 int 2293 sys_chown(p, v, retval) 2294 struct proc *p; 2295 void *v; 2296 register_t *retval; 2297 { 2298 struct sys_chown_args /* { 2299 syscallarg(const char *) path; 2300 syscallarg(uid_t) uid; 2301 syscallarg(gid_t) gid; 2302 } */ *uap = v; 2303 int error; 2304 struct nameidata nd; 2305 2306 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2307 if ((error = namei(&nd)) != 0) 2308 return (error); 2309 2310 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2311 2312 vrele(nd.ni_vp); 2313 return (error); 2314 } 2315 2316 /* 2317 * Set ownership given a path name; this version follows links. 2318 * Provides POSIX semantics. 2319 */ 2320 /* ARGSUSED */ 2321 int 2322 sys___posix_chown(p, v, retval) 2323 struct proc *p; 2324 void *v; 2325 register_t *retval; 2326 { 2327 struct sys_chown_args /* { 2328 syscallarg(const char *) path; 2329 syscallarg(uid_t) uid; 2330 syscallarg(gid_t) gid; 2331 } */ *uap = v; 2332 int error; 2333 struct nameidata nd; 2334 2335 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2336 if ((error = namei(&nd)) != 0) 2337 return (error); 2338 2339 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2340 2341 vrele(nd.ni_vp); 2342 return (error); 2343 } 2344 2345 /* 2346 * Set ownership given a file descriptor. 2347 */ 2348 /* ARGSUSED */ 2349 int 2350 sys_fchown(p, v, retval) 2351 struct proc *p; 2352 void *v; 2353 register_t *retval; 2354 { 2355 struct sys_fchown_args /* { 2356 syscallarg(int) fd; 2357 syscallarg(uid_t) uid; 2358 syscallarg(gid_t) gid; 2359 } */ *uap = v; 2360 int error; 2361 struct file *fp; 2362 2363 /* getvnode() will use the descriptor for us */ 2364 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2365 return (error); 2366 2367 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2368 SCARG(uap, gid), p, 0); 2369 FILE_UNUSE(fp, p); 2370 return (error); 2371 } 2372 2373 /* 2374 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2375 */ 2376 /* ARGSUSED */ 2377 int 2378 sys___posix_fchown(p, v, retval) 2379 struct proc *p; 2380 void *v; 2381 register_t *retval; 2382 { 2383 struct sys_fchown_args /* { 2384 syscallarg(int) fd; 2385 syscallarg(uid_t) uid; 2386 syscallarg(gid_t) gid; 2387 } */ *uap = v; 2388 int error; 2389 struct file *fp; 2390 2391 /* getvnode() will use the descriptor for us */ 2392 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2393 return (error); 2394 2395 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2396 SCARG(uap, gid), p, 1); 2397 FILE_UNUSE(fp, p); 2398 return (error); 2399 } 2400 2401 /* 2402 * Set ownership given a path name; this version does not follow links. 2403 */ 2404 /* ARGSUSED */ 2405 int 2406 sys_lchown(p, v, retval) 2407 struct proc *p; 2408 void *v; 2409 register_t *retval; 2410 { 2411 struct sys_lchown_args /* { 2412 syscallarg(const char *) path; 2413 syscallarg(uid_t) uid; 2414 syscallarg(gid_t) gid; 2415 } */ *uap = v; 2416 int error; 2417 struct nameidata nd; 2418 2419 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2420 if ((error = namei(&nd)) != 0) 2421 return (error); 2422 2423 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2424 2425 vrele(nd.ni_vp); 2426 return (error); 2427 } 2428 2429 /* 2430 * Set ownership given a path name; this version does not follow links. 2431 * Provides POSIX/XPG semantics. 2432 */ 2433 /* ARGSUSED */ 2434 int 2435 sys___posix_lchown(p, v, retval) 2436 struct proc *p; 2437 void *v; 2438 register_t *retval; 2439 { 2440 struct sys_lchown_args /* { 2441 syscallarg(const char *) path; 2442 syscallarg(uid_t) uid; 2443 syscallarg(gid_t) gid; 2444 } */ *uap = v; 2445 int error; 2446 struct nameidata nd; 2447 2448 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2449 if ((error = namei(&nd)) != 0) 2450 return (error); 2451 2452 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2453 2454 vrele(nd.ni_vp); 2455 return (error); 2456 } 2457 2458 /* 2459 * Common routine to set ownership given a vnode. 2460 */ 2461 static int 2462 change_owner(vp, uid, gid, p, posix_semantics) 2463 struct vnode *vp; 2464 uid_t uid; 2465 gid_t gid; 2466 struct proc *p; 2467 int posix_semantics; 2468 { 2469 struct vattr vattr; 2470 mode_t newmode; 2471 int error; 2472 2473 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2474 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2475 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2476 goto out; 2477 2478 #define CHANGED(x) ((x) != -1) 2479 newmode = vattr.va_mode; 2480 if (posix_semantics) { 2481 /* 2482 * POSIX/XPG semantics: if the caller is not the super-user, 2483 * clear set-user-id and set-group-id bits. Both POSIX and 2484 * the XPG consider the behaviour for calls by the super-user 2485 * implementation-defined; we leave the set-user-id and set- 2486 * group-id settings intact in that case. 2487 */ 2488 if (suser(p->p_ucred, NULL) != 0) 2489 newmode &= ~(S_ISUID | S_ISGID); 2490 } else { 2491 /* 2492 * NetBSD semantics: when changing owner and/or group, 2493 * clear the respective bit(s). 2494 */ 2495 if (CHANGED(uid)) 2496 newmode &= ~S_ISUID; 2497 if (CHANGED(gid)) 2498 newmode &= ~S_ISGID; 2499 } 2500 /* Update va_mode iff altered. */ 2501 if (vattr.va_mode == newmode) 2502 newmode = VNOVAL; 2503 2504 VATTR_NULL(&vattr); 2505 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2506 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2507 vattr.va_mode = newmode; 2508 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2509 #undef CHANGED 2510 2511 out: 2512 VOP_UNLOCK(vp, 0); 2513 return (error); 2514 } 2515 2516 /* 2517 * Set the access and modification times given a path name; this 2518 * version follows links. 2519 */ 2520 /* ARGSUSED */ 2521 int 2522 sys_utimes(p, v, retval) 2523 struct proc *p; 2524 void *v; 2525 register_t *retval; 2526 { 2527 struct sys_utimes_args /* { 2528 syscallarg(const char *) path; 2529 syscallarg(const struct timeval *) tptr; 2530 } */ *uap = v; 2531 int error; 2532 struct nameidata nd; 2533 2534 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2535 if ((error = namei(&nd)) != 0) 2536 return (error); 2537 2538 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2539 2540 vrele(nd.ni_vp); 2541 return (error); 2542 } 2543 2544 /* 2545 * Set the access and modification times given a file descriptor. 2546 */ 2547 /* ARGSUSED */ 2548 int 2549 sys_futimes(p, v, retval) 2550 struct proc *p; 2551 void *v; 2552 register_t *retval; 2553 { 2554 struct sys_futimes_args /* { 2555 syscallarg(int) fd; 2556 syscallarg(const struct timeval *) tptr; 2557 } */ *uap = v; 2558 int error; 2559 struct file *fp; 2560 2561 /* getvnode() will use the descriptor for us */ 2562 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2563 return (error); 2564 2565 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2566 FILE_UNUSE(fp, p); 2567 return (error); 2568 } 2569 2570 /* 2571 * Set the access and modification times given a path name; this 2572 * version does not follow links. 2573 */ 2574 /* ARGSUSED */ 2575 int 2576 sys_lutimes(p, v, retval) 2577 struct proc *p; 2578 void *v; 2579 register_t *retval; 2580 { 2581 struct sys_lutimes_args /* { 2582 syscallarg(const char *) path; 2583 syscallarg(const struct timeval *) tptr; 2584 } */ *uap = v; 2585 int error; 2586 struct nameidata nd; 2587 2588 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2589 if ((error = namei(&nd)) != 0) 2590 return (error); 2591 2592 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2593 2594 vrele(nd.ni_vp); 2595 return (error); 2596 } 2597 2598 /* 2599 * Common routine to set access and modification times given a vnode. 2600 */ 2601 static int 2602 change_utimes(vp, tptr, p) 2603 struct vnode *vp; 2604 const struct timeval *tptr; 2605 struct proc *p; 2606 { 2607 struct timeval tv[2]; 2608 struct vattr vattr; 2609 int error; 2610 2611 VATTR_NULL(&vattr); 2612 if (tptr == NULL) { 2613 microtime(&tv[0]); 2614 tv[1] = tv[0]; 2615 vattr.va_vaflags |= VA_UTIMES_NULL; 2616 } else { 2617 error = copyin(tptr, tv, sizeof(tv)); 2618 if (error) 2619 return (error); 2620 } 2621 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2622 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2623 vattr.va_atime.tv_sec = tv[0].tv_sec; 2624 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2625 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2626 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2627 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2628 VOP_UNLOCK(vp, 0); 2629 return (error); 2630 } 2631 2632 /* 2633 * Truncate a file given its path name. 2634 */ 2635 /* ARGSUSED */ 2636 int 2637 sys_truncate(p, v, retval) 2638 struct proc *p; 2639 void *v; 2640 register_t *retval; 2641 { 2642 struct sys_truncate_args /* { 2643 syscallarg(const char *) path; 2644 syscallarg(int) pad; 2645 syscallarg(off_t) length; 2646 } */ *uap = v; 2647 struct vnode *vp; 2648 struct vattr vattr; 2649 int error; 2650 struct nameidata nd; 2651 2652 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2653 if ((error = namei(&nd)) != 0) 2654 return (error); 2655 vp = nd.ni_vp; 2656 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2657 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2658 if (vp->v_type == VDIR) 2659 error = EISDIR; 2660 else if ((error = vn_writechk(vp)) == 0 && 2661 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2662 VATTR_NULL(&vattr); 2663 vattr.va_size = SCARG(uap, length); 2664 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2665 } 2666 vput(vp); 2667 return (error); 2668 } 2669 2670 /* 2671 * Truncate a file given a file descriptor. 2672 */ 2673 /* ARGSUSED */ 2674 int 2675 sys_ftruncate(p, v, retval) 2676 struct proc *p; 2677 void *v; 2678 register_t *retval; 2679 { 2680 struct sys_ftruncate_args /* { 2681 syscallarg(int) fd; 2682 syscallarg(int) pad; 2683 syscallarg(off_t) length; 2684 } */ *uap = v; 2685 struct vattr vattr; 2686 struct vnode *vp; 2687 struct file *fp; 2688 int error; 2689 2690 /* getvnode() will use the descriptor for us */ 2691 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2692 return (error); 2693 if ((fp->f_flag & FWRITE) == 0) { 2694 error = EINVAL; 2695 goto out; 2696 } 2697 vp = (struct vnode *)fp->f_data; 2698 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2699 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2700 if (vp->v_type == VDIR) 2701 error = EISDIR; 2702 else if ((error = vn_writechk(vp)) == 0) { 2703 VATTR_NULL(&vattr); 2704 vattr.va_size = SCARG(uap, length); 2705 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2706 } 2707 VOP_UNLOCK(vp, 0); 2708 out: 2709 FILE_UNUSE(fp, p); 2710 return (error); 2711 } 2712 2713 /* 2714 * Sync an open file. 2715 */ 2716 /* ARGSUSED */ 2717 int 2718 sys_fsync(p, v, retval) 2719 struct proc *p; 2720 void *v; 2721 register_t *retval; 2722 { 2723 struct sys_fsync_args /* { 2724 syscallarg(int) fd; 2725 } */ *uap = v; 2726 struct vnode *vp; 2727 struct file *fp; 2728 int error; 2729 2730 /* getvnode() will use the descriptor for us */ 2731 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2732 return (error); 2733 vp = (struct vnode *)fp->f_data; 2734 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2735 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2736 if (error == 0 && bioops.io_fsync != NULL && 2737 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2738 (*bioops.io_fsync)(vp); 2739 VOP_UNLOCK(vp, 0); 2740 FILE_UNUSE(fp, p); 2741 return (error); 2742 } 2743 2744 /* 2745 * Sync the data of an open file. 2746 */ 2747 /* ARGSUSED */ 2748 int 2749 sys_fdatasync(p, v, retval) 2750 struct proc *p; 2751 void *v; 2752 register_t *retval; 2753 { 2754 struct sys_fdatasync_args /* { 2755 syscallarg(int) fd; 2756 } */ *uap = v; 2757 struct vnode *vp; 2758 struct file *fp; 2759 int error; 2760 2761 /* getvnode() will use the descriptor for us */ 2762 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2763 return (error); 2764 vp = (struct vnode *)fp->f_data; 2765 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2766 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2767 VOP_UNLOCK(vp, 0); 2768 FILE_UNUSE(fp, p); 2769 return (error); 2770 } 2771 2772 /* 2773 * Rename files, (standard) BSD semantics frontend. 2774 */ 2775 /* ARGSUSED */ 2776 int 2777 sys_rename(p, v, retval) 2778 struct proc *p; 2779 void *v; 2780 register_t *retval; 2781 { 2782 struct sys_rename_args /* { 2783 syscallarg(const char *) from; 2784 syscallarg(const char *) to; 2785 } */ *uap = v; 2786 2787 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2788 } 2789 2790 /* 2791 * Rename files, POSIX semantics frontend. 2792 */ 2793 /* ARGSUSED */ 2794 int 2795 sys___posix_rename(p, v, retval) 2796 struct proc *p; 2797 void *v; 2798 register_t *retval; 2799 { 2800 struct sys___posix_rename_args /* { 2801 syscallarg(const char *) from; 2802 syscallarg(const char *) to; 2803 } */ *uap = v; 2804 2805 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2806 } 2807 2808 /* 2809 * Rename files. Source and destination must either both be directories, 2810 * or both not be directories. If target is a directory, it must be empty. 2811 * If `from' and `to' refer to the same object, the value of the `retain' 2812 * argument is used to determine whether `from' will be 2813 * 2814 * (retain == 0) deleted unless `from' and `to' refer to the same 2815 * object in the file system's name space (BSD). 2816 * (retain == 1) always retained (POSIX). 2817 */ 2818 static int 2819 rename_files(from, to, p, retain) 2820 const char *from, *to; 2821 struct proc *p; 2822 int retain; 2823 { 2824 struct vnode *tvp, *fvp, *tdvp; 2825 struct nameidata fromnd, tond; 2826 int error; 2827 2828 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2829 from, p); 2830 if ((error = namei(&fromnd)) != 0) 2831 return (error); 2832 fvp = fromnd.ni_vp; 2833 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2834 UIO_USERSPACE, to, p); 2835 if ((error = namei(&tond)) != 0) { 2836 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2837 vrele(fromnd.ni_dvp); 2838 vrele(fvp); 2839 goto out1; 2840 } 2841 tdvp = tond.ni_dvp; 2842 tvp = tond.ni_vp; 2843 2844 if (tvp != NULL) { 2845 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2846 error = ENOTDIR; 2847 goto out; 2848 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2849 error = EISDIR; 2850 goto out; 2851 } 2852 } 2853 2854 if (fvp == tdvp) 2855 error = EINVAL; 2856 2857 /* 2858 * Source and destination refer to the same object. 2859 */ 2860 if (fvp == tvp) { 2861 if (retain) 2862 error = -1; 2863 else if (fromnd.ni_dvp == tdvp && 2864 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2865 !memcmp(fromnd.ni_cnd.cn_nameptr, 2866 tond.ni_cnd.cn_nameptr, 2867 fromnd.ni_cnd.cn_namelen)) 2868 error = -1; 2869 } 2870 2871 out: 2872 if (!error) { 2873 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2874 if (fromnd.ni_dvp != tdvp) 2875 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2876 if (tvp) { 2877 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2878 } 2879 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2880 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2881 } else { 2882 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2883 if (tdvp == tvp) 2884 vrele(tdvp); 2885 else 2886 vput(tdvp); 2887 if (tvp) 2888 vput(tvp); 2889 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2890 vrele(fromnd.ni_dvp); 2891 vrele(fvp); 2892 } 2893 vrele(tond.ni_startdir); 2894 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2895 out1: 2896 if (fromnd.ni_startdir) 2897 vrele(fromnd.ni_startdir); 2898 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2899 return (error == -1 ? 0 : error); 2900 } 2901 2902 /* 2903 * Make a directory file. 2904 */ 2905 /* ARGSUSED */ 2906 int 2907 sys_mkdir(p, v, retval) 2908 struct proc *p; 2909 void *v; 2910 register_t *retval; 2911 { 2912 struct sys_mkdir_args /* { 2913 syscallarg(const char *) path; 2914 syscallarg(int) mode; 2915 } */ *uap = v; 2916 struct vnode *vp; 2917 struct vattr vattr; 2918 int error; 2919 struct nameidata nd; 2920 2921 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2922 if ((error = namei(&nd)) != 0) 2923 return (error); 2924 vp = nd.ni_vp; 2925 if (vp != NULL) { 2926 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2927 if (nd.ni_dvp == vp) 2928 vrele(nd.ni_dvp); 2929 else 2930 vput(nd.ni_dvp); 2931 vrele(vp); 2932 return (EEXIST); 2933 } 2934 VATTR_NULL(&vattr); 2935 vattr.va_type = VDIR; 2936 vattr.va_mode = 2937 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2938 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2939 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2940 if (!error) 2941 vput(nd.ni_vp); 2942 return (error); 2943 } 2944 2945 /* 2946 * Remove a directory file. 2947 */ 2948 /* ARGSUSED */ 2949 int 2950 sys_rmdir(p, v, retval) 2951 struct proc *p; 2952 void *v; 2953 register_t *retval; 2954 { 2955 struct sys_rmdir_args /* { 2956 syscallarg(const char *) path; 2957 } */ *uap = v; 2958 struct vnode *vp; 2959 int error; 2960 struct nameidata nd; 2961 2962 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2963 SCARG(uap, path), p); 2964 if ((error = namei(&nd)) != 0) 2965 return (error); 2966 vp = nd.ni_vp; 2967 if (vp->v_type != VDIR) { 2968 error = ENOTDIR; 2969 goto out; 2970 } 2971 /* 2972 * No rmdir "." please. 2973 */ 2974 if (nd.ni_dvp == vp) { 2975 error = EINVAL; 2976 goto out; 2977 } 2978 /* 2979 * The root of a mounted filesystem cannot be deleted. 2980 */ 2981 if (vp->v_flag & VROOT) 2982 error = EBUSY; 2983 out: 2984 if (!error) { 2985 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2986 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2987 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2988 } else { 2989 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2990 if (nd.ni_dvp == vp) 2991 vrele(nd.ni_dvp); 2992 else 2993 vput(nd.ni_dvp); 2994 vput(vp); 2995 } 2996 return (error); 2997 } 2998 2999 /* 3000 * Read a block of directory entries in a file system independent format. 3001 */ 3002 int 3003 sys_getdents(p, v, retval) 3004 struct proc *p; 3005 void *v; 3006 register_t *retval; 3007 { 3008 struct sys_getdents_args /* { 3009 syscallarg(int) fd; 3010 syscallarg(char *) buf; 3011 syscallarg(size_t) count; 3012 } */ *uap = v; 3013 struct file *fp; 3014 int error, done; 3015 3016 /* getvnode() will use the descriptor for us */ 3017 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3018 return (error); 3019 if ((fp->f_flag & FREAD) == 0) { 3020 error = EBADF; 3021 goto out; 3022 } 3023 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3024 SCARG(uap, count), &done, p, 0, 0); 3025 *retval = done; 3026 out: 3027 FILE_UNUSE(fp, p); 3028 return (error); 3029 } 3030 3031 /* 3032 * Set the mode mask for creation of filesystem nodes. 3033 */ 3034 int 3035 sys_umask(p, v, retval) 3036 struct proc *p; 3037 void *v; 3038 register_t *retval; 3039 { 3040 struct sys_umask_args /* { 3041 syscallarg(mode_t) newmask; 3042 } */ *uap = v; 3043 struct cwdinfo *cwdi; 3044 3045 cwdi = p->p_cwdi; 3046 *retval = cwdi->cwdi_cmask; 3047 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3048 return (0); 3049 } 3050 3051 /* 3052 * Void all references to file by ripping underlying filesystem 3053 * away from vnode. 3054 */ 3055 /* ARGSUSED */ 3056 int 3057 sys_revoke(p, v, retval) 3058 struct proc *p; 3059 void *v; 3060 register_t *retval; 3061 { 3062 struct sys_revoke_args /* { 3063 syscallarg(const char *) path; 3064 } */ *uap = v; 3065 struct vnode *vp; 3066 struct vattr vattr; 3067 int error; 3068 struct nameidata nd; 3069 3070 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3071 if ((error = namei(&nd)) != 0) 3072 return (error); 3073 vp = nd.ni_vp; 3074 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3075 goto out; 3076 if (p->p_ucred->cr_uid != vattr.va_uid && 3077 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3078 goto out; 3079 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3080 VOP_REVOKE(vp, REVOKEALL); 3081 out: 3082 vrele(vp); 3083 return (error); 3084 } 3085 3086 /* 3087 * Convert a user file descriptor to a kernel file entry. 3088 */ 3089 int 3090 getvnode(fdp, fd, fpp) 3091 struct filedesc *fdp; 3092 int fd; 3093 struct file **fpp; 3094 { 3095 struct vnode *vp; 3096 struct file *fp; 3097 3098 if ((fp = fd_getfile(fdp, fd)) == NULL) 3099 return (EBADF); 3100 3101 FILE_USE(fp); 3102 3103 if (fp->f_type != DTYPE_VNODE) { 3104 FILE_UNUSE(fp, NULL); 3105 return (EINVAL); 3106 } 3107 3108 vp = (struct vnode *)fp->f_data; 3109 if (vp->v_type == VBAD) { 3110 FILE_UNUSE(fp, NULL); 3111 return (EBADF); 3112 } 3113 3114 *fpp = fp; 3115 return (0); 3116 } 3117
Indexes created Fri Oct 03 02:09:57 GMT 2025