vfs_syscalls.c revision 1.168.2.3
1 /* $NetBSD: vfs_syscalls.c,v 1.168.2.3 2001/10/01 12:47:01 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 = crget(); 1905 struct vnode *vp; 1906 int error, flags; 1907 struct nameidata nd; 1908 1909 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 1910 cred->cr_ref = 1; 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 /* Override default credentials */ 1916 nd.ni_cnd.cn_cred = cred; 1917 if ((error = namei(&nd)) != 0) 1918 goto out; 1919 vp = nd.ni_vp; 1920 1921 /* Flags == 0 means only check for existence. */ 1922 if (SCARG(uap, flags)) { 1923 flags = 0; 1924 if (SCARG(uap, flags) & R_OK) 1925 flags |= VREAD; 1926 if (SCARG(uap, flags) & W_OK) 1927 flags |= VWRITE; 1928 if (SCARG(uap, flags) & X_OK) 1929 flags |= VEXEC; 1930 1931 error = VOP_ACCESS(vp, flags, cred, p); 1932 if (!error && (flags & VWRITE)) 1933 error = vn_writechk(vp); 1934 } 1935 vput(vp); 1936 out: 1937 crfree(cred); 1938 return (error); 1939 } 1940 1941 /* 1942 * Get file status; this version follows links. 1943 */ 1944 /* ARGSUSED */ 1945 int 1946 sys___stat13(p, v, retval) 1947 struct proc *p; 1948 void *v; 1949 register_t *retval; 1950 { 1951 struct sys___stat13_args /* { 1952 syscallarg(const char *) path; 1953 syscallarg(struct stat *) ub; 1954 } */ *uap = v; 1955 struct stat sb; 1956 int error; 1957 struct nameidata nd; 1958 1959 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1960 SCARG(uap, path), p); 1961 if ((error = namei(&nd)) != 0) 1962 return (error); 1963 error = vn_stat(nd.ni_vp, &sb, p); 1964 vput(nd.ni_vp); 1965 if (error) 1966 return (error); 1967 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1968 return (error); 1969 } 1970 1971 /* 1972 * Get file status; this version does not follow links. 1973 */ 1974 /* ARGSUSED */ 1975 int 1976 sys___lstat13(p, v, retval) 1977 struct proc *p; 1978 void *v; 1979 register_t *retval; 1980 { 1981 struct sys___lstat13_args /* { 1982 syscallarg(const char *) path; 1983 syscallarg(struct stat *) ub; 1984 } */ *uap = v; 1985 struct stat sb; 1986 int error; 1987 struct nameidata nd; 1988 1989 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1990 SCARG(uap, path), p); 1991 if ((error = namei(&nd)) != 0) 1992 return (error); 1993 error = vn_stat(nd.ni_vp, &sb, p); 1994 vput(nd.ni_vp); 1995 if (error) 1996 return (error); 1997 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1998 return (error); 1999 } 2000 2001 /* 2002 * Get configurable pathname variables. 2003 */ 2004 /* ARGSUSED */ 2005 int 2006 sys_pathconf(p, v, retval) 2007 struct proc *p; 2008 void *v; 2009 register_t *retval; 2010 { 2011 struct sys_pathconf_args /* { 2012 syscallarg(const char *) path; 2013 syscallarg(int) name; 2014 } */ *uap = v; 2015 int error; 2016 struct nameidata nd; 2017 2018 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2019 SCARG(uap, path), p); 2020 if ((error = namei(&nd)) != 0) 2021 return (error); 2022 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2023 vput(nd.ni_vp); 2024 return (error); 2025 } 2026 2027 /* 2028 * Return target name of a symbolic link. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys_readlink(p, v, retval) 2033 struct proc *p; 2034 void *v; 2035 register_t *retval; 2036 { 2037 struct sys_readlink_args /* { 2038 syscallarg(const char *) path; 2039 syscallarg(char *) buf; 2040 syscallarg(size_t) count; 2041 } */ *uap = v; 2042 struct vnode *vp; 2043 struct iovec aiov; 2044 struct uio auio; 2045 int error; 2046 struct nameidata nd; 2047 2048 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2049 SCARG(uap, path), p); 2050 if ((error = namei(&nd)) != 0) 2051 return (error); 2052 vp = nd.ni_vp; 2053 if (vp->v_type != VLNK) 2054 error = EINVAL; 2055 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2056 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2057 aiov.iov_base = SCARG(uap, buf); 2058 aiov.iov_len = SCARG(uap, count); 2059 auio.uio_iov = &aiov; 2060 auio.uio_iovcnt = 1; 2061 auio.uio_offset = 0; 2062 auio.uio_rw = UIO_READ; 2063 auio.uio_segflg = UIO_USERSPACE; 2064 auio.uio_procp = p; 2065 auio.uio_resid = SCARG(uap, count); 2066 error = VOP_READLINK(vp, &auio, p->p_ucred); 2067 } 2068 vput(vp); 2069 *retval = SCARG(uap, count) - auio.uio_resid; 2070 return (error); 2071 } 2072 2073 /* 2074 * Change flags of a file given a path name. 2075 */ 2076 /* ARGSUSED */ 2077 int 2078 sys_chflags(p, v, retval) 2079 struct proc *p; 2080 void *v; 2081 register_t *retval; 2082 { 2083 struct sys_chflags_args /* { 2084 syscallarg(const char *) path; 2085 syscallarg(u_long) flags; 2086 } */ *uap = v; 2087 struct vnode *vp; 2088 int error; 2089 struct nameidata nd; 2090 2091 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2092 if ((error = namei(&nd)) != 0) 2093 return (error); 2094 vp = nd.ni_vp; 2095 error = change_flags(vp, SCARG(uap, flags), p); 2096 vput(vp); 2097 return (error); 2098 } 2099 2100 /* 2101 * Change flags of a file given a file descriptor. 2102 */ 2103 /* ARGSUSED */ 2104 int 2105 sys_fchflags(p, v, retval) 2106 struct proc *p; 2107 void *v; 2108 register_t *retval; 2109 { 2110 struct sys_fchflags_args /* { 2111 syscallarg(int) fd; 2112 syscallarg(u_long) flags; 2113 } */ *uap = v; 2114 struct vnode *vp; 2115 struct file *fp; 2116 int error; 2117 2118 /* getvnode() will use the descriptor for us */ 2119 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2120 return (error); 2121 vp = (struct vnode *)fp->f_data; 2122 error = change_flags(vp, SCARG(uap, flags), p); 2123 VOP_UNLOCK(vp, 0); 2124 FILE_UNUSE(fp, p); 2125 return (error); 2126 } 2127 2128 /* 2129 * Change flags of a file given a path name; this version does 2130 * not follow links. 2131 */ 2132 int 2133 sys_lchflags(p, v, retval) 2134 struct proc *p; 2135 void *v; 2136 register_t *retval; 2137 { 2138 struct sys_lchflags_args /* { 2139 syscallarg(const char *) path; 2140 syscallarg(u_long) flags; 2141 } */ *uap = v; 2142 struct vnode *vp; 2143 int error; 2144 struct nameidata nd; 2145 2146 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2147 if ((error = namei(&nd)) != 0) 2148 return (error); 2149 vp = nd.ni_vp; 2150 error = change_flags(vp, SCARG(uap, flags), p); 2151 vput(vp); 2152 return (error); 2153 } 2154 2155 /* 2156 * Common routine to change flags of a file. 2157 */ 2158 int 2159 change_flags(vp, flags, p) 2160 struct vnode *vp; 2161 u_long flags; 2162 struct proc *p; 2163 { 2164 struct vattr vattr; 2165 int error; 2166 2167 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2169 /* 2170 * Non-superusers cannot change the flags on devices, even if they 2171 * own them. 2172 */ 2173 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2174 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2175 goto out; 2176 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2177 error = EINVAL; 2178 goto out; 2179 } 2180 } 2181 VATTR_NULL(&vattr); 2182 vattr.va_flags = flags; 2183 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2184 out: 2185 return (error); 2186 } 2187 2188 /* 2189 * Change mode of a file given path name; this version follows links. 2190 */ 2191 /* ARGSUSED */ 2192 int 2193 sys_chmod(p, v, retval) 2194 struct proc *p; 2195 void *v; 2196 register_t *retval; 2197 { 2198 struct sys_chmod_args /* { 2199 syscallarg(const char *) path; 2200 syscallarg(int) mode; 2201 } */ *uap = v; 2202 int error; 2203 struct nameidata nd; 2204 2205 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2206 if ((error = namei(&nd)) != 0) 2207 return (error); 2208 2209 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2210 2211 vrele(nd.ni_vp); 2212 return (error); 2213 } 2214 2215 /* 2216 * Change mode of a file given a file descriptor. 2217 */ 2218 /* ARGSUSED */ 2219 int 2220 sys_fchmod(p, v, retval) 2221 struct proc *p; 2222 void *v; 2223 register_t *retval; 2224 { 2225 struct sys_fchmod_args /* { 2226 syscallarg(int) fd; 2227 syscallarg(int) mode; 2228 } */ *uap = v; 2229 struct file *fp; 2230 int error; 2231 2232 /* getvnode() will use the descriptor for us */ 2233 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2234 return (error); 2235 2236 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2237 FILE_UNUSE(fp, p); 2238 return (error); 2239 } 2240 2241 /* 2242 * Change mode of a file given path name; this version does not follow links. 2243 */ 2244 /* ARGSUSED */ 2245 int 2246 sys_lchmod(p, v, retval) 2247 struct proc *p; 2248 void *v; 2249 register_t *retval; 2250 { 2251 struct sys_lchmod_args /* { 2252 syscallarg(const char *) path; 2253 syscallarg(int) mode; 2254 } */ *uap = v; 2255 int error; 2256 struct nameidata nd; 2257 2258 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2259 if ((error = namei(&nd)) != 0) 2260 return (error); 2261 2262 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2263 2264 vrele(nd.ni_vp); 2265 return (error); 2266 } 2267 2268 /* 2269 * Common routine to set mode given a vnode. 2270 */ 2271 static int 2272 change_mode(vp, mode, p) 2273 struct vnode *vp; 2274 int mode; 2275 struct proc *p; 2276 { 2277 struct vattr vattr; 2278 int error; 2279 2280 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2281 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2282 VATTR_NULL(&vattr); 2283 vattr.va_mode = mode & ALLPERMS; 2284 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2285 VOP_UNLOCK(vp, 0); 2286 return (error); 2287 } 2288 2289 /* 2290 * Set ownership given a path name; this version follows links. 2291 */ 2292 /* ARGSUSED */ 2293 int 2294 sys_chown(p, v, retval) 2295 struct proc *p; 2296 void *v; 2297 register_t *retval; 2298 { 2299 struct sys_chown_args /* { 2300 syscallarg(const char *) path; 2301 syscallarg(uid_t) uid; 2302 syscallarg(gid_t) gid; 2303 } */ *uap = v; 2304 int error; 2305 struct nameidata nd; 2306 2307 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2308 if ((error = namei(&nd)) != 0) 2309 return (error); 2310 2311 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2312 2313 vrele(nd.ni_vp); 2314 return (error); 2315 } 2316 2317 /* 2318 * Set ownership given a path name; this version follows links. 2319 * Provides POSIX semantics. 2320 */ 2321 /* ARGSUSED */ 2322 int 2323 sys___posix_chown(p, v, retval) 2324 struct proc *p; 2325 void *v; 2326 register_t *retval; 2327 { 2328 struct sys_chown_args /* { 2329 syscallarg(const char *) path; 2330 syscallarg(uid_t) uid; 2331 syscallarg(gid_t) gid; 2332 } */ *uap = v; 2333 int error; 2334 struct nameidata nd; 2335 2336 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2337 if ((error = namei(&nd)) != 0) 2338 return (error); 2339 2340 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2341 2342 vrele(nd.ni_vp); 2343 return (error); 2344 } 2345 2346 /* 2347 * Set ownership given a file descriptor. 2348 */ 2349 /* ARGSUSED */ 2350 int 2351 sys_fchown(p, v, retval) 2352 struct proc *p; 2353 void *v; 2354 register_t *retval; 2355 { 2356 struct sys_fchown_args /* { 2357 syscallarg(int) fd; 2358 syscallarg(uid_t) uid; 2359 syscallarg(gid_t) gid; 2360 } */ *uap = v; 2361 int error; 2362 struct file *fp; 2363 2364 /* getvnode() will use the descriptor for us */ 2365 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2366 return (error); 2367 2368 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2369 SCARG(uap, gid), p, 0); 2370 FILE_UNUSE(fp, p); 2371 return (error); 2372 } 2373 2374 /* 2375 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2376 */ 2377 /* ARGSUSED */ 2378 int 2379 sys___posix_fchown(p, v, retval) 2380 struct proc *p; 2381 void *v; 2382 register_t *retval; 2383 { 2384 struct sys_fchown_args /* { 2385 syscallarg(int) fd; 2386 syscallarg(uid_t) uid; 2387 syscallarg(gid_t) gid; 2388 } */ *uap = v; 2389 int error; 2390 struct file *fp; 2391 2392 /* getvnode() will use the descriptor for us */ 2393 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2394 return (error); 2395 2396 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2397 SCARG(uap, gid), p, 1); 2398 FILE_UNUSE(fp, p); 2399 return (error); 2400 } 2401 2402 /* 2403 * Set ownership given a path name; this version does not follow links. 2404 */ 2405 /* ARGSUSED */ 2406 int 2407 sys_lchown(p, v, retval) 2408 struct proc *p; 2409 void *v; 2410 register_t *retval; 2411 { 2412 struct sys_lchown_args /* { 2413 syscallarg(const char *) path; 2414 syscallarg(uid_t) uid; 2415 syscallarg(gid_t) gid; 2416 } */ *uap = v; 2417 int error; 2418 struct nameidata nd; 2419 2420 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2421 if ((error = namei(&nd)) != 0) 2422 return (error); 2423 2424 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2425 2426 vrele(nd.ni_vp); 2427 return (error); 2428 } 2429 2430 /* 2431 * Set ownership given a path name; this version does not follow links. 2432 * Provides POSIX/XPG semantics. 2433 */ 2434 /* ARGSUSED */ 2435 int 2436 sys___posix_lchown(p, v, retval) 2437 struct proc *p; 2438 void *v; 2439 register_t *retval; 2440 { 2441 struct sys_lchown_args /* { 2442 syscallarg(const char *) path; 2443 syscallarg(uid_t) uid; 2444 syscallarg(gid_t) gid; 2445 } */ *uap = v; 2446 int error; 2447 struct nameidata nd; 2448 2449 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2450 if ((error = namei(&nd)) != 0) 2451 return (error); 2452 2453 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2454 2455 vrele(nd.ni_vp); 2456 return (error); 2457 } 2458 2459 /* 2460 * Common routine to set ownership given a vnode. 2461 */ 2462 static int 2463 change_owner(vp, uid, gid, p, posix_semantics) 2464 struct vnode *vp; 2465 uid_t uid; 2466 gid_t gid; 2467 struct proc *p; 2468 int posix_semantics; 2469 { 2470 struct vattr vattr; 2471 mode_t newmode; 2472 int error; 2473 2474 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2475 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2476 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2477 goto out; 2478 2479 #define CHANGED(x) ((x) != -1) 2480 newmode = vattr.va_mode; 2481 if (posix_semantics) { 2482 /* 2483 * POSIX/XPG semantics: if the caller is not the super-user, 2484 * clear set-user-id and set-group-id bits. Both POSIX and 2485 * the XPG consider the behaviour for calls by the super-user 2486 * implementation-defined; we leave the set-user-id and set- 2487 * group-id settings intact in that case. 2488 */ 2489 if (suser(p->p_ucred, NULL) != 0) 2490 newmode &= ~(S_ISUID | S_ISGID); 2491 } else { 2492 /* 2493 * NetBSD semantics: when changing owner and/or group, 2494 * clear the respective bit(s). 2495 */ 2496 if (CHANGED(uid)) 2497 newmode &= ~S_ISUID; 2498 if (CHANGED(gid)) 2499 newmode &= ~S_ISGID; 2500 } 2501 /* Update va_mode iff altered. */ 2502 if (vattr.va_mode == newmode) 2503 newmode = VNOVAL; 2504 2505 VATTR_NULL(&vattr); 2506 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2507 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2508 vattr.va_mode = newmode; 2509 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2510 #undef CHANGED 2511 2512 out: 2513 VOP_UNLOCK(vp, 0); 2514 return (error); 2515 } 2516 2517 /* 2518 * Set the access and modification times given a path name; this 2519 * version follows links. 2520 */ 2521 /* ARGSUSED */ 2522 int 2523 sys_utimes(p, v, retval) 2524 struct proc *p; 2525 void *v; 2526 register_t *retval; 2527 { 2528 struct sys_utimes_args /* { 2529 syscallarg(const char *) path; 2530 syscallarg(const struct timeval *) tptr; 2531 } */ *uap = v; 2532 int error; 2533 struct nameidata nd; 2534 2535 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2536 if ((error = namei(&nd)) != 0) 2537 return (error); 2538 2539 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2540 2541 vrele(nd.ni_vp); 2542 return (error); 2543 } 2544 2545 /* 2546 * Set the access and modification times given a file descriptor. 2547 */ 2548 /* ARGSUSED */ 2549 int 2550 sys_futimes(p, v, retval) 2551 struct proc *p; 2552 void *v; 2553 register_t *retval; 2554 { 2555 struct sys_futimes_args /* { 2556 syscallarg(int) fd; 2557 syscallarg(const struct timeval *) tptr; 2558 } */ *uap = v; 2559 int error; 2560 struct file *fp; 2561 2562 /* getvnode() will use the descriptor for us */ 2563 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2564 return (error); 2565 2566 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2567 FILE_UNUSE(fp, p); 2568 return (error); 2569 } 2570 2571 /* 2572 * Set the access and modification times given a path name; this 2573 * version does not follow links. 2574 */ 2575 /* ARGSUSED */ 2576 int 2577 sys_lutimes(p, v, retval) 2578 struct proc *p; 2579 void *v; 2580 register_t *retval; 2581 { 2582 struct sys_lutimes_args /* { 2583 syscallarg(const char *) path; 2584 syscallarg(const struct timeval *) tptr; 2585 } */ *uap = v; 2586 int error; 2587 struct nameidata nd; 2588 2589 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2590 if ((error = namei(&nd)) != 0) 2591 return (error); 2592 2593 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2594 2595 vrele(nd.ni_vp); 2596 return (error); 2597 } 2598 2599 /* 2600 * Common routine to set access and modification times given a vnode. 2601 */ 2602 static int 2603 change_utimes(vp, tptr, p) 2604 struct vnode *vp; 2605 const struct timeval *tptr; 2606 struct proc *p; 2607 { 2608 struct timeval tv[2]; 2609 struct vattr vattr; 2610 int error; 2611 2612 VATTR_NULL(&vattr); 2613 if (tptr == NULL) { 2614 microtime(&tv[0]); 2615 tv[1] = tv[0]; 2616 vattr.va_vaflags |= VA_UTIMES_NULL; 2617 } else { 2618 error = copyin(tptr, tv, sizeof(tv)); 2619 if (error) 2620 return (error); 2621 } 2622 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2623 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2624 vattr.va_atime.tv_sec = tv[0].tv_sec; 2625 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2626 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2627 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2628 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2629 VOP_UNLOCK(vp, 0); 2630 return (error); 2631 } 2632 2633 /* 2634 * Truncate a file given its path name. 2635 */ 2636 /* ARGSUSED */ 2637 int 2638 sys_truncate(p, v, retval) 2639 struct proc *p; 2640 void *v; 2641 register_t *retval; 2642 { 2643 struct sys_truncate_args /* { 2644 syscallarg(const char *) path; 2645 syscallarg(int) pad; 2646 syscallarg(off_t) length; 2647 } */ *uap = v; 2648 struct vnode *vp; 2649 struct vattr vattr; 2650 int error; 2651 struct nameidata nd; 2652 2653 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2654 if ((error = namei(&nd)) != 0) 2655 return (error); 2656 vp = nd.ni_vp; 2657 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2658 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2659 if (vp->v_type == VDIR) 2660 error = EISDIR; 2661 else if ((error = vn_writechk(vp)) == 0 && 2662 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2663 VATTR_NULL(&vattr); 2664 vattr.va_size = SCARG(uap, length); 2665 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2666 } 2667 vput(vp); 2668 return (error); 2669 } 2670 2671 /* 2672 * Truncate a file given a file descriptor. 2673 */ 2674 /* ARGSUSED */ 2675 int 2676 sys_ftruncate(p, v, retval) 2677 struct proc *p; 2678 void *v; 2679 register_t *retval; 2680 { 2681 struct sys_ftruncate_args /* { 2682 syscallarg(int) fd; 2683 syscallarg(int) pad; 2684 syscallarg(off_t) length; 2685 } */ *uap = v; 2686 struct vattr vattr; 2687 struct vnode *vp; 2688 struct file *fp; 2689 int error; 2690 2691 /* getvnode() will use the descriptor for us */ 2692 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2693 return (error); 2694 if ((fp->f_flag & FWRITE) == 0) { 2695 error = EINVAL; 2696 goto out; 2697 } 2698 vp = (struct vnode *)fp->f_data; 2699 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2700 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2701 if (vp->v_type == VDIR) 2702 error = EISDIR; 2703 else if ((error = vn_writechk(vp)) == 0) { 2704 VATTR_NULL(&vattr); 2705 vattr.va_size = SCARG(uap, length); 2706 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2707 } 2708 VOP_UNLOCK(vp, 0); 2709 out: 2710 FILE_UNUSE(fp, p); 2711 return (error); 2712 } 2713 2714 /* 2715 * Sync an open file. 2716 */ 2717 /* ARGSUSED */ 2718 int 2719 sys_fsync(p, v, retval) 2720 struct proc *p; 2721 void *v; 2722 register_t *retval; 2723 { 2724 struct sys_fsync_args /* { 2725 syscallarg(int) fd; 2726 } */ *uap = v; 2727 struct vnode *vp; 2728 struct file *fp; 2729 int error; 2730 2731 /* getvnode() will use the descriptor for us */ 2732 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2733 return (error); 2734 vp = (struct vnode *)fp->f_data; 2735 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2736 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2737 if (error == 0 && bioops.io_fsync != NULL && 2738 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2739 (*bioops.io_fsync)(vp); 2740 VOP_UNLOCK(vp, 0); 2741 FILE_UNUSE(fp, p); 2742 return (error); 2743 } 2744 2745 /* 2746 * Sync the data of an open file. 2747 */ 2748 /* ARGSUSED */ 2749 int 2750 sys_fdatasync(p, v, retval) 2751 struct proc *p; 2752 void *v; 2753 register_t *retval; 2754 { 2755 struct sys_fdatasync_args /* { 2756 syscallarg(int) fd; 2757 } */ *uap = v; 2758 struct vnode *vp; 2759 struct file *fp; 2760 int error; 2761 2762 /* getvnode() will use the descriptor for us */ 2763 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2764 return (error); 2765 vp = (struct vnode *)fp->f_data; 2766 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2767 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2768 VOP_UNLOCK(vp, 0); 2769 FILE_UNUSE(fp, p); 2770 return (error); 2771 } 2772 2773 /* 2774 * Rename files, (standard) BSD semantics frontend. 2775 */ 2776 /* ARGSUSED */ 2777 int 2778 sys_rename(p, v, retval) 2779 struct proc *p; 2780 void *v; 2781 register_t *retval; 2782 { 2783 struct sys_rename_args /* { 2784 syscallarg(const char *) from; 2785 syscallarg(const char *) to; 2786 } */ *uap = v; 2787 2788 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2789 } 2790 2791 /* 2792 * Rename files, POSIX semantics frontend. 2793 */ 2794 /* ARGSUSED */ 2795 int 2796 sys___posix_rename(p, v, retval) 2797 struct proc *p; 2798 void *v; 2799 register_t *retval; 2800 { 2801 struct sys___posix_rename_args /* { 2802 syscallarg(const char *) from; 2803 syscallarg(const char *) to; 2804 } */ *uap = v; 2805 2806 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2807 } 2808 2809 /* 2810 * Rename files. Source and destination must either both be directories, 2811 * or both not be directories. If target is a directory, it must be empty. 2812 * If `from' and `to' refer to the same object, the value of the `retain' 2813 * argument is used to determine whether `from' will be 2814 * 2815 * (retain == 0) deleted unless `from' and `to' refer to the same 2816 * object in the file system's name space (BSD). 2817 * (retain == 1) always retained (POSIX). 2818 */ 2819 static int 2820 rename_files(from, to, p, retain) 2821 const char *from, *to; 2822 struct proc *p; 2823 int retain; 2824 { 2825 struct vnode *tvp, *fvp, *tdvp; 2826 struct nameidata fromnd, tond; 2827 int error; 2828 2829 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2830 from, p); 2831 if ((error = namei(&fromnd)) != 0) 2832 return (error); 2833 fvp = fromnd.ni_vp; 2834 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2835 UIO_USERSPACE, to, p); 2836 if ((error = namei(&tond)) != 0) { 2837 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2838 vrele(fromnd.ni_dvp); 2839 vrele(fvp); 2840 goto out1; 2841 } 2842 tdvp = tond.ni_dvp; 2843 tvp = tond.ni_vp; 2844 2845 if (tvp != NULL) { 2846 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2847 error = ENOTDIR; 2848 goto out; 2849 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2850 error = EISDIR; 2851 goto out; 2852 } 2853 } 2854 2855 if (fvp == tdvp) 2856 error = EINVAL; 2857 2858 /* 2859 * Source and destination refer to the same object. 2860 */ 2861 if (fvp == tvp) { 2862 if (retain) 2863 error = -1; 2864 else if (fromnd.ni_dvp == tdvp && 2865 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2866 !memcmp(fromnd.ni_cnd.cn_nameptr, 2867 tond.ni_cnd.cn_nameptr, 2868 fromnd.ni_cnd.cn_namelen)) 2869 error = -1; 2870 } 2871 2872 out: 2873 if (!error) { 2874 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2875 if (fromnd.ni_dvp != tdvp) 2876 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2877 if (tvp) { 2878 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2879 } 2880 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2881 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2882 } else { 2883 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2884 if (tdvp == tvp) 2885 vrele(tdvp); 2886 else 2887 vput(tdvp); 2888 if (tvp) 2889 vput(tvp); 2890 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2891 vrele(fromnd.ni_dvp); 2892 vrele(fvp); 2893 } 2894 vrele(tond.ni_startdir); 2895 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2896 out1: 2897 if (fromnd.ni_startdir) 2898 vrele(fromnd.ni_startdir); 2899 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2900 return (error == -1 ? 0 : error); 2901 } 2902 2903 /* 2904 * Make a directory file. 2905 */ 2906 /* ARGSUSED */ 2907 int 2908 sys_mkdir(p, v, retval) 2909 struct proc *p; 2910 void *v; 2911 register_t *retval; 2912 { 2913 struct sys_mkdir_args /* { 2914 syscallarg(const char *) path; 2915 syscallarg(int) mode; 2916 } */ *uap = v; 2917 struct vnode *vp; 2918 struct vattr vattr; 2919 int error; 2920 struct nameidata nd; 2921 2922 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2923 if ((error = namei(&nd)) != 0) 2924 return (error); 2925 vp = nd.ni_vp; 2926 if (vp != NULL) { 2927 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2928 if (nd.ni_dvp == vp) 2929 vrele(nd.ni_dvp); 2930 else 2931 vput(nd.ni_dvp); 2932 vrele(vp); 2933 return (EEXIST); 2934 } 2935 VATTR_NULL(&vattr); 2936 vattr.va_type = VDIR; 2937 vattr.va_mode = 2938 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2939 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2940 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2941 if (!error) 2942 vput(nd.ni_vp); 2943 return (error); 2944 } 2945 2946 /* 2947 * Remove a directory file. 2948 */ 2949 /* ARGSUSED */ 2950 int 2951 sys_rmdir(p, v, retval) 2952 struct proc *p; 2953 void *v; 2954 register_t *retval; 2955 { 2956 struct sys_rmdir_args /* { 2957 syscallarg(const char *) path; 2958 } */ *uap = v; 2959 struct vnode *vp; 2960 int error; 2961 struct nameidata nd; 2962 2963 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2964 SCARG(uap, path), p); 2965 if ((error = namei(&nd)) != 0) 2966 return (error); 2967 vp = nd.ni_vp; 2968 if (vp->v_type != VDIR) { 2969 error = ENOTDIR; 2970 goto out; 2971 } 2972 /* 2973 * No rmdir "." please. 2974 */ 2975 if (nd.ni_dvp == vp) { 2976 error = EINVAL; 2977 goto out; 2978 } 2979 /* 2980 * The root of a mounted filesystem cannot be deleted. 2981 */ 2982 if (vp->v_flag & VROOT) 2983 error = EBUSY; 2984 out: 2985 if (!error) { 2986 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2987 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2988 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2989 } else { 2990 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2991 if (nd.ni_dvp == vp) 2992 vrele(nd.ni_dvp); 2993 else 2994 vput(nd.ni_dvp); 2995 vput(vp); 2996 } 2997 return (error); 2998 } 2999 3000 /* 3001 * Read a block of directory entries in a file system independent format. 3002 */ 3003 int 3004 sys_getdents(p, v, retval) 3005 struct proc *p; 3006 void *v; 3007 register_t *retval; 3008 { 3009 struct sys_getdents_args /* { 3010 syscallarg(int) fd; 3011 syscallarg(char *) buf; 3012 syscallarg(size_t) count; 3013 } */ *uap = v; 3014 struct file *fp; 3015 int error, done; 3016 3017 /* getvnode() will use the descriptor for us */ 3018 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3019 return (error); 3020 if ((fp->f_flag & FREAD) == 0) { 3021 error = EBADF; 3022 goto out; 3023 } 3024 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3025 SCARG(uap, count), &done, p, 0, 0); 3026 *retval = done; 3027 out: 3028 FILE_UNUSE(fp, p); 3029 return (error); 3030 } 3031 3032 /* 3033 * Set the mode mask for creation of filesystem nodes. 3034 */ 3035 int 3036 sys_umask(p, v, retval) 3037 struct proc *p; 3038 void *v; 3039 register_t *retval; 3040 { 3041 struct sys_umask_args /* { 3042 syscallarg(mode_t) newmask; 3043 } */ *uap = v; 3044 struct cwdinfo *cwdi; 3045 3046 cwdi = p->p_cwdi; 3047 *retval = cwdi->cwdi_cmask; 3048 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3049 return (0); 3050 } 3051 3052 /* 3053 * Void all references to file by ripping underlying filesystem 3054 * away from vnode. 3055 */ 3056 /* ARGSUSED */ 3057 int 3058 sys_revoke(p, v, retval) 3059 struct proc *p; 3060 void *v; 3061 register_t *retval; 3062 { 3063 struct sys_revoke_args /* { 3064 syscallarg(const char *) path; 3065 } */ *uap = v; 3066 struct vnode *vp; 3067 struct vattr vattr; 3068 int error; 3069 struct nameidata nd; 3070 3071 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3072 if ((error = namei(&nd)) != 0) 3073 return (error); 3074 vp = nd.ni_vp; 3075 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3076 goto out; 3077 if (p->p_ucred->cr_uid != vattr.va_uid && 3078 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3079 goto out; 3080 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3081 VOP_REVOKE(vp, REVOKEALIAS); 3082 out: 3083 vrele(vp); 3084 return (error); 3085 } 3086 3087 /* 3088 * Convert a user file descriptor to a kernel file entry. 3089 */ 3090 int 3091 getvnode(fdp, fd, fpp) 3092 struct filedesc *fdp; 3093 int fd; 3094 struct file **fpp; 3095 { 3096 struct vnode *vp; 3097 struct file *fp; 3098 3099 if ((fp = fd_getfile(fdp, fd)) == NULL) 3100 return (EBADF); 3101 3102 FILE_USE(fp); 3103 3104 if (fp->f_type != DTYPE_VNODE) { 3105 FILE_UNUSE(fp, NULL); 3106 return (EINVAL); 3107 } 3108 3109 vp = (struct vnode *)fp->f_data; 3110 if (vp->v_type == VBAD) { 3111 FILE_UNUSE(fp, NULL); 3112 return (EBADF); 3113 } 3114 3115 *fpp = fp; 3116 return (0); 3117 } 3118
Indexes created Fri Oct 03 02:09:57 GMT 2025