vfs_syscalls.c revision 1.167
1 /* $NetBSD: vfs_syscalls.c,v 1.167 2001/06/28 08:04:18 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 #include <sys/syscallargs.h> 60 61 #include <miscfs/genfs/genfs.h> 62 #include <miscfs/syncfs/syncfs.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <sys/sysctl.h> 67 68 static int change_dir __P((struct nameidata *, struct proc *)); 69 static int change_flags __P((struct vnode *, u_long, struct proc *)); 70 static int change_mode __P((struct vnode *, int, struct proc *p)); 71 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 72 int)); 73 static int change_utimes __P((struct vnode *vp, const struct timeval *, 74 struct proc *p)); 75 static int rename_files __P((const char *, const char *, struct proc *, int)); 76 77 void checkdirs __P((struct vnode *)); 78 79 int dovfsusermount = 0; 80 81 /* 82 * Virtual File System System Calls 83 */ 84 85 /* 86 * Mount a file system. 87 */ 88 89 #if defined(COMPAT_09) || defined(COMPAT_43) 90 /* 91 * This table is used to maintain compatibility with 4.3BSD 92 * and NetBSD 0.9 mount syscalls. Note, the order is important! 93 * 94 * Do not modify this table. It should only contain filesystems 95 * supported by NetBSD 0.9 and 4.3BSD. 96 */ 97 const char * const mountcompatnames[] = { 98 NULL, /* 0 = MOUNT_NONE */ 99 MOUNT_FFS, /* 1 = MOUNT_UFS */ 100 MOUNT_NFS, /* 2 */ 101 MOUNT_MFS, /* 3 */ 102 MOUNT_MSDOS, /* 4 */ 103 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 104 MOUNT_FDESC, /* 6 */ 105 MOUNT_KERNFS, /* 7 */ 106 NULL, /* 8 = MOUNT_DEVFS */ 107 MOUNT_AFS, /* 9 */ 108 }; 109 const int nmountcompatnames = sizeof(mountcompatnames) / 110 sizeof(mountcompatnames[0]); 111 #endif /* COMPAT_09 || COMPAT_43 */ 112 113 /* ARGSUSED */ 114 int 115 sys_mount(p, v, retval) 116 struct proc *p; 117 void *v; 118 register_t *retval; 119 { 120 struct sys_mount_args /* { 121 syscallarg(const char *) type; 122 syscallarg(const char *) path; 123 syscallarg(int) flags; 124 syscallarg(void *) data; 125 } */ *uap = v; 126 struct vnode *vp; 127 struct mount *mp; 128 int error, flag = 0; 129 char fstypename[MFSNAMELEN]; 130 struct vattr va; 131 struct nameidata nd; 132 struct vfsops *vfs; 133 134 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 135 return (error); 136 /* 137 * Get vnode to be covered 138 */ 139 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 140 SCARG(uap, path), p); 141 if ((error = namei(&nd)) != 0) 142 return (error); 143 vp = nd.ni_vp; 144 /* 145 * A lookup in VFS_MOUNT might result in an attempt to 146 * lock this vnode again, so make the lock resursive. 147 */ 148 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 149 if (SCARG(uap, flags) & MNT_UPDATE) { 150 if ((vp->v_flag & VROOT) == 0) { 151 vput(vp); 152 return (EINVAL); 153 } 154 mp = vp->v_mount; 155 flag = mp->mnt_flag; 156 vfs = mp->mnt_op; 157 /* 158 * We only allow the filesystem to be reloaded if it 159 * is currently mounted read-only. 160 */ 161 if ((SCARG(uap, flags) & MNT_RELOAD) && 162 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 163 vput(vp); 164 return (EOPNOTSUPP); /* Needs translation */ 165 } 166 /* 167 * In "highly secure" mode, don't let the caller do anything 168 * but downgrade a filesystem from read-write to read-only. 169 * (see also below; MNT_UPDATE is required.) 170 */ 171 if (securelevel >= 2 && 172 (SCARG(uap, flags) != 173 (mp->mnt_flag | MNT_RDONLY | 174 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 175 vput(vp); 176 return (EPERM); 177 } 178 mp->mnt_flag |= 179 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 180 /* 181 * Only root, or the user that did the original mount is 182 * permitted to update it. 183 */ 184 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 185 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 186 vput(vp); 187 return (error); 188 } 189 /* 190 * Do not allow NFS export by non-root users. For non-root 191 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 192 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 193 */ 194 if (p->p_ucred->cr_uid != 0) { 195 if (SCARG(uap, flags) & MNT_EXPORTED) { 196 vput(vp); 197 return (EPERM); 198 } 199 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 200 if (flag & MNT_NOEXEC) 201 SCARG(uap, flags) |= MNT_NOEXEC; 202 } 203 if (vfs_busy(mp, LK_NOWAIT, 0)) { 204 vput(vp); 205 return (EPERM); 206 } 207 VOP_UNLOCK(vp, 0); 208 goto update; 209 } else { 210 if (securelevel >= 2) { 211 vput(vp); 212 return (EPERM); 213 } 214 } 215 /* 216 * If the user is not root, ensure that they own the directory 217 * onto which we are attempting to mount. 218 */ 219 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 220 (va.va_uid != p->p_ucred->cr_uid && 221 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 222 vput(vp); 223 return (error); 224 } 225 /* 226 * Do not allow NFS export by non-root users. For non-root users, 227 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 228 * mount point is already MNT_NOEXEC. 229 */ 230 if (p->p_ucred->cr_uid != 0) { 231 if (SCARG(uap, flags) & MNT_EXPORTED) { 232 vput(vp); 233 return (EPERM); 234 } 235 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 236 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 237 SCARG(uap, flags) |= MNT_NOEXEC; 238 } 239 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 240 return (error); 241 if (vp->v_type != VDIR) { 242 vput(vp); 243 return (ENOTDIR); 244 } 245 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 246 if (error) { 247 #if defined(COMPAT_09) || defined(COMPAT_43) 248 /* 249 * Historically filesystem types were identified by number. 250 * If we get an integer for the filesystem type instead of a 251 * string, we check to see if it matches one of the historic 252 * filesystem types. 253 */ 254 u_long fsindex = (u_long)SCARG(uap, type); 255 if (fsindex >= nmountcompatnames || 256 mountcompatnames[fsindex] == NULL) { 257 vput(vp); 258 return (ENODEV); 259 } 260 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 261 #else 262 vput(vp); 263 return (error); 264 #endif 265 } 266 #ifdef COMPAT_10 267 /* Accept `ufs' as an alias for `ffs'. */ 268 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 269 strncpy(fstypename, "ffs", MFSNAMELEN); 270 #endif 271 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 272 vput(vp); 273 return (ENODEV); 274 } 275 if (vp->v_mountedhere != NULL) { 276 vput(vp); 277 return (EBUSY); 278 } 279 280 /* 281 * Allocate and initialize the file system. 282 */ 283 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 284 M_MOUNT, M_WAITOK); 285 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 286 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 287 (void)vfs_busy(mp, LK_NOWAIT, 0); 288 mp->mnt_op = vfs; 289 vfs->vfs_refcount++; 290 mp->mnt_vnodecovered = vp; 291 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 292 mp->mnt_unmounter = NULL; 293 update: 294 /* 295 * Set the mount level flags. 296 */ 297 if (SCARG(uap, flags) & MNT_RDONLY) 298 mp->mnt_flag |= MNT_RDONLY; 299 else if (mp->mnt_flag & MNT_RDONLY) 300 mp->mnt_flag |= MNT_WANTRDWR; 301 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 302 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 303 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 304 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 305 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 306 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 307 MNT_SOFTDEP); 308 /* 309 * Mount the filesystem. 310 */ 311 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 312 if (mp->mnt_flag & MNT_UPDATE) { 313 vrele(vp); 314 if (mp->mnt_flag & MNT_WANTRDWR) 315 mp->mnt_flag &= ~MNT_RDONLY; 316 mp->mnt_flag &=~ 317 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 318 if (error) 319 mp->mnt_flag = flag; 320 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 321 if (mp->mnt_syncer == NULL) 322 error = vfs_allocate_syncvnode(mp); 323 } else { 324 if (mp->mnt_syncer != NULL) 325 vfs_deallocate_syncvnode(mp); 326 } 327 vfs_unbusy(mp); 328 return (error); 329 } 330 /* 331 * Put the new filesystem on the mount list after root. 332 */ 333 cache_purge(vp); 334 if (!error) { 335 vp->v_mountedhere = mp; 336 simple_lock(&mountlist_slock); 337 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 338 simple_unlock(&mountlist_slock); 339 checkdirs(vp); 340 VOP_UNLOCK(vp, 0); 341 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 342 error = vfs_allocate_syncvnode(mp); 343 vfs_unbusy(mp); 344 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 345 if ((error = VFS_START(mp, 0, p))) 346 vrele(vp); 347 } else { 348 vp->v_mountedhere = (struct mount *)0; 349 vfs->vfs_refcount--; 350 vfs_unbusy(mp); 351 free((caddr_t)mp, M_MOUNT); 352 vput(vp); 353 } 354 return (error); 355 } 356 357 /* 358 * Scan all active processes to see if any of them have a current 359 * or root directory onto which the new filesystem has just been 360 * mounted. If so, replace them with the new mount point. 361 */ 362 void 363 checkdirs(olddp) 364 struct vnode *olddp; 365 { 366 struct cwdinfo *cwdi; 367 struct vnode *newdp; 368 struct proc *p; 369 370 if (olddp->v_usecount == 1) 371 return; 372 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 373 panic("mount: lost mount"); 374 proclist_lock_read(); 375 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 376 cwdi = p->p_cwdi; 377 if (cwdi->cwdi_cdir == olddp) { 378 vrele(cwdi->cwdi_cdir); 379 VREF(newdp); 380 cwdi->cwdi_cdir = newdp; 381 } 382 if (cwdi->cwdi_rdir == olddp) { 383 vrele(cwdi->cwdi_rdir); 384 VREF(newdp); 385 cwdi->cwdi_rdir = newdp; 386 } 387 } 388 proclist_unlock_read(); 389 if (rootvnode == olddp) { 390 vrele(rootvnode); 391 VREF(newdp); 392 rootvnode = newdp; 393 } 394 vput(newdp); 395 } 396 397 /* 398 * Unmount a file system. 399 * 400 * Note: unmount takes a path to the vnode mounted on as argument, 401 * not special file (as before). 402 */ 403 /* ARGSUSED */ 404 int 405 sys_unmount(p, v, retval) 406 struct proc *p; 407 void *v; 408 register_t *retval; 409 { 410 struct sys_unmount_args /* { 411 syscallarg(const char *) path; 412 syscallarg(int) flags; 413 } */ *uap = v; 414 struct vnode *vp; 415 struct mount *mp; 416 int error; 417 struct nameidata nd; 418 419 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 420 SCARG(uap, path), p); 421 if ((error = namei(&nd)) != 0) 422 return (error); 423 vp = nd.ni_vp; 424 mp = vp->v_mount; 425 426 /* 427 * Only root, or the user that did the original mount is 428 * permitted to unmount this filesystem. 429 */ 430 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 431 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 432 vput(vp); 433 return (error); 434 } 435 436 /* 437 * Don't allow unmounting the root file system. 438 */ 439 if (mp->mnt_flag & MNT_ROOTFS) { 440 vput(vp); 441 return (EINVAL); 442 } 443 444 /* 445 * Must be the root of the filesystem 446 */ 447 if ((vp->v_flag & VROOT) == 0) { 448 vput(vp); 449 return (EINVAL); 450 } 451 vput(vp); 452 453 /* 454 * XXX Freeze syncer. Must do this before locking the 455 * mount point. See dounmount() for details. 456 */ 457 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 458 459 if (vfs_busy(mp, 0, 0)) { 460 lockmgr(&syncer_lock, LK_RELEASE, NULL); 461 return (EBUSY); 462 } 463 464 return (dounmount(mp, SCARG(uap, flags), p)); 465 } 466 467 /* 468 * Do the actual file system unmount. File system is assumed to have been 469 * marked busy by the caller. 470 */ 471 int 472 dounmount(mp, flags, p) 473 struct mount *mp; 474 int flags; 475 struct proc *p; 476 { 477 struct vnode *coveredvp; 478 int error; 479 int async; 480 int used_syncer; 481 482 simple_lock(&mountlist_slock); 483 vfs_unbusy(mp); 484 used_syncer = (mp->mnt_syncer != NULL); 485 486 /* 487 * XXX Syncer must be frozen when we get here. This should really 488 * be done on a per-mountpoint basis, but especially the softdep 489 * code possibly called from the syncer doens't exactly work on a 490 * per-mountpoint basis, so the softdep code would become a maze 491 * of vfs_busy() calls. 492 * 493 * The caller of dounmount() must acquire syncer_lock because 494 * the syncer itself acquires locks in syncer_lock -> vfs_busy 495 * order, and we must preserve that order to avoid deadlock. 496 * 497 * So, if the file system did not use the syncer, now is 498 * the time to release the syncer_lock. 499 */ 500 if (used_syncer == 0) 501 lockmgr(&syncer_lock, LK_RELEASE, NULL); 502 503 mp->mnt_flag |= MNT_UNMOUNT; 504 mp->mnt_unmounter = p; 505 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 506 if (mp->mnt_flag & MNT_EXPUBLIC) 507 vfs_setpublicfs(NULL, NULL, NULL); 508 async = mp->mnt_flag & MNT_ASYNC; 509 mp->mnt_flag &= ~MNT_ASYNC; 510 cache_purgevfs(mp); /* remove cache entries for this file sys */ 511 if (mp->mnt_syncer != NULL) 512 vfs_deallocate_syncvnode(mp); 513 if (((mp->mnt_flag & MNT_RDONLY) || 514 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 515 (flags & MNT_FORCE)) 516 error = VFS_UNMOUNT(mp, flags, p); 517 simple_lock(&mountlist_slock); 518 if (error) { 519 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 520 (void) vfs_allocate_syncvnode(mp); 521 mp->mnt_flag &= ~MNT_UNMOUNT; 522 mp->mnt_unmounter = NULL; 523 mp->mnt_flag |= async; 524 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 525 &mountlist_slock); 526 if (used_syncer) 527 lockmgr(&syncer_lock, LK_RELEASE, NULL); 528 while (mp->mnt_wcnt > 0) { 529 wakeup((caddr_t)mp); 530 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 531 } 532 return (error); 533 } 534 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 535 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 536 coveredvp->v_mountedhere = NULL; 537 vrele(coveredvp); 538 } 539 mp->mnt_op->vfs_refcount--; 540 if (mp->mnt_vnodelist.lh_first != NULL) 541 panic("unmount: dangling vnode"); 542 mp->mnt_flag |= MNT_GONE; 543 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 544 if (used_syncer) 545 lockmgr(&syncer_lock, LK_RELEASE, NULL); 546 while(mp->mnt_wcnt > 0) { 547 wakeup((caddr_t)mp); 548 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 549 } 550 free((caddr_t)mp, M_MOUNT); 551 return (0); 552 } 553 554 /* 555 * Sync each mounted filesystem. 556 */ 557 #ifdef DEBUG 558 int syncprt = 0; 559 struct ctldebug debug0 = { "syncprt", &syncprt }; 560 #endif 561 562 /* ARGSUSED */ 563 int 564 sys_sync(p, v, retval) 565 struct proc *p; 566 void *v; 567 register_t *retval; 568 { 569 struct mount *mp, *nmp; 570 int asyncflag; 571 572 simple_lock(&mountlist_slock); 573 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 574 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 575 nmp = mp->mnt_list.cqe_prev; 576 continue; 577 } 578 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 579 asyncflag = mp->mnt_flag & MNT_ASYNC; 580 mp->mnt_flag &= ~MNT_ASYNC; 581 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 582 if (asyncflag) 583 mp->mnt_flag |= MNT_ASYNC; 584 } 585 simple_lock(&mountlist_slock); 586 nmp = mp->mnt_list.cqe_prev; 587 vfs_unbusy(mp); 588 589 } 590 simple_unlock(&mountlist_slock); 591 #ifdef DEBUG 592 if (syncprt) 593 vfs_bufstats(); 594 #endif /* DEBUG */ 595 return (0); 596 } 597 598 /* 599 * Change filesystem quotas. 600 */ 601 /* ARGSUSED */ 602 int 603 sys_quotactl(p, v, retval) 604 struct proc *p; 605 void *v; 606 register_t *retval; 607 { 608 struct sys_quotactl_args /* { 609 syscallarg(const char *) path; 610 syscallarg(int) cmd; 611 syscallarg(int) uid; 612 syscallarg(caddr_t) arg; 613 } */ *uap = v; 614 struct mount *mp; 615 int error; 616 struct nameidata nd; 617 618 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 619 if ((error = namei(&nd)) != 0) 620 return (error); 621 mp = nd.ni_vp->v_mount; 622 vrele(nd.ni_vp); 623 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 624 SCARG(uap, arg), p)); 625 } 626 627 /* 628 * Get filesystem statistics. 629 */ 630 /* ARGSUSED */ 631 int 632 sys_statfs(p, v, retval) 633 struct proc *p; 634 void *v; 635 register_t *retval; 636 { 637 struct sys_statfs_args /* { 638 syscallarg(const char *) path; 639 syscallarg(struct statfs *) buf; 640 } */ *uap = v; 641 struct mount *mp; 642 struct statfs *sp; 643 int error; 644 struct nameidata nd; 645 646 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 647 if ((error = namei(&nd)) != 0) 648 return (error); 649 mp = nd.ni_vp->v_mount; 650 sp = &mp->mnt_stat; 651 vrele(nd.ni_vp); 652 if ((error = VFS_STATFS(mp, sp, p)) != 0) 653 return (error); 654 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 655 sp->f_oflags = sp->f_flags & 0xffff; 656 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 657 } 658 659 /* 660 * Get filesystem statistics. 661 */ 662 /* ARGSUSED */ 663 int 664 sys_fstatfs(p, v, retval) 665 struct proc *p; 666 void *v; 667 register_t *retval; 668 { 669 struct sys_fstatfs_args /* { 670 syscallarg(int) fd; 671 syscallarg(struct statfs *) buf; 672 } */ *uap = v; 673 struct file *fp; 674 struct mount *mp; 675 struct statfs *sp; 676 int error; 677 678 /* getvnode() will use the descriptor for us */ 679 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 680 return (error); 681 mp = ((struct vnode *)fp->f_data)->v_mount; 682 sp = &mp->mnt_stat; 683 if ((error = VFS_STATFS(mp, sp, p)) != 0) 684 goto out; 685 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 686 sp->f_oflags = sp->f_flags & 0xffff; 687 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 688 out: 689 FILE_UNUSE(fp, p); 690 return (error); 691 } 692 693 /* 694 * Get statistics on all filesystems. 695 */ 696 int 697 sys_getfsstat(p, v, retval) 698 struct proc *p; 699 void *v; 700 register_t *retval; 701 { 702 struct sys_getfsstat_args /* { 703 syscallarg(struct statfs *) buf; 704 syscallarg(long) bufsize; 705 syscallarg(int) flags; 706 } */ *uap = v; 707 struct mount *mp, *nmp; 708 struct statfs *sp; 709 caddr_t sfsp; 710 long count, maxcount, error; 711 712 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 713 sfsp = (caddr_t)SCARG(uap, buf); 714 simple_lock(&mountlist_slock); 715 count = 0; 716 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 717 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 718 nmp = mp->mnt_list.cqe_next; 719 continue; 720 } 721 if (sfsp && count < maxcount) { 722 sp = &mp->mnt_stat; 723 /* 724 * If MNT_NOWAIT or MNT_LAZY is specified, do not 725 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 726 * overrides MNT_NOWAIT. 727 */ 728 if (SCARG(uap, flags) != MNT_NOWAIT && 729 SCARG(uap, flags) != MNT_LAZY && 730 (SCARG(uap, flags) == MNT_WAIT || 731 SCARG(uap, flags) == 0) && 732 (error = VFS_STATFS(mp, sp, p)) != 0) { 733 simple_lock(&mountlist_slock); 734 nmp = mp->mnt_list.cqe_next; 735 vfs_unbusy(mp); 736 continue; 737 } 738 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 739 sp->f_oflags = sp->f_flags & 0xffff; 740 error = copyout(sp, sfsp, sizeof(*sp)); 741 if (error) { 742 vfs_unbusy(mp); 743 return (error); 744 } 745 sfsp += sizeof(*sp); 746 } 747 count++; 748 simple_lock(&mountlist_slock); 749 nmp = mp->mnt_list.cqe_next; 750 vfs_unbusy(mp); 751 } 752 simple_unlock(&mountlist_slock); 753 if (sfsp && count > maxcount) 754 *retval = maxcount; 755 else 756 *retval = count; 757 return (0); 758 } 759 760 /* 761 * Change current working directory to a given file descriptor. 762 */ 763 /* ARGSUSED */ 764 int 765 sys_fchdir(p, v, retval) 766 struct proc *p; 767 void *v; 768 register_t *retval; 769 { 770 struct sys_fchdir_args /* { 771 syscallarg(int) fd; 772 } */ *uap = v; 773 struct filedesc *fdp = p->p_fd; 774 struct cwdinfo *cwdi = p->p_cwdi; 775 struct vnode *vp, *tdp; 776 struct mount *mp; 777 struct file *fp; 778 int error; 779 780 /* getvnode() will use the descriptor for us */ 781 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 782 return (error); 783 vp = (struct vnode *)fp->f_data; 784 785 VREF(vp); 786 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 787 if (vp->v_type != VDIR) 788 error = ENOTDIR; 789 else 790 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 791 while (!error && (mp = vp->v_mountedhere) != NULL) { 792 if (vfs_busy(mp, 0, 0)) 793 continue; 794 error = VFS_ROOT(mp, &tdp); 795 vfs_unbusy(mp); 796 if (error) 797 break; 798 vput(vp); 799 vp = tdp; 800 } 801 if (error) { 802 vput(vp); 803 goto out; 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* 808 * Disallow changing to a directory not under the process's 809 * current root directory (if there is one). 810 */ 811 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 812 vrele(vp); 813 error = EPERM; /* operation not permitted */ 814 goto out; 815 } 816 817 vrele(cwdi->cwdi_cdir); 818 cwdi->cwdi_cdir = vp; 819 out: 820 FILE_UNUSE(fp, p); 821 return (error); 822 } 823 824 /* 825 * Change this process's notion of the root directory to a given file descriptor. 826 */ 827 828 int 829 sys_fchroot(p, v, retval) 830 struct proc *p; 831 void *v; 832 register_t *retval; 833 { 834 struct sys_fchroot_args *uap = v; 835 struct filedesc *fdp = p->p_fd; 836 struct cwdinfo *cwdi = p->p_cwdi; 837 struct vnode *vp; 838 struct file *fp; 839 int error; 840 841 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 842 return error; 843 /* getvnode() will use the descriptor for us */ 844 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 845 return error; 846 vp = (struct vnode *) fp->f_data; 847 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 848 if (vp->v_type != VDIR) 849 error = ENOTDIR; 850 else 851 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 852 VOP_UNLOCK(vp, 0); 853 if (error) 854 goto out; 855 VREF(vp); 856 857 /* 858 * Prevent escaping from chroot by putting the root under 859 * the working directory. Silently chdir to / if we aren't 860 * already there. 861 */ 862 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 863 /* 864 * XXX would be more failsafe to change directory to a 865 * deadfs node here instead 866 */ 867 vrele(cwdi->cwdi_cdir); 868 VREF(vp); 869 cwdi->cwdi_cdir = vp; 870 } 871 872 if (cwdi->cwdi_rdir != NULL) 873 vrele(cwdi->cwdi_rdir); 874 cwdi->cwdi_rdir = vp; 875 out: 876 FILE_UNUSE(fp, p); 877 return (error); 878 } 879 880 881 882 /* 883 * Change current working directory (``.''). 884 */ 885 /* ARGSUSED */ 886 int 887 sys_chdir(p, v, retval) 888 struct proc *p; 889 void *v; 890 register_t *retval; 891 { 892 struct sys_chdir_args /* { 893 syscallarg(const char *) path; 894 } */ *uap = v; 895 struct cwdinfo *cwdi = p->p_cwdi; 896 int error; 897 struct nameidata nd; 898 899 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 900 SCARG(uap, path), p); 901 if ((error = change_dir(&nd, p)) != 0) 902 return (error); 903 vrele(cwdi->cwdi_cdir); 904 cwdi->cwdi_cdir = nd.ni_vp; 905 return (0); 906 } 907 908 /* 909 * Change notion of root (``/'') directory. 910 */ 911 /* ARGSUSED */ 912 int 913 sys_chroot(p, v, retval) 914 struct proc *p; 915 void *v; 916 register_t *retval; 917 { 918 struct sys_chroot_args /* { 919 syscallarg(const char *) path; 920 } */ *uap = v; 921 struct cwdinfo *cwdi = p->p_cwdi; 922 struct vnode *vp; 923 int error; 924 struct nameidata nd; 925 926 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 927 return (error); 928 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 929 SCARG(uap, path), p); 930 if ((error = change_dir(&nd, p)) != 0) 931 return (error); 932 if (cwdi->cwdi_rdir != NULL) 933 vrele(cwdi->cwdi_rdir); 934 vp = nd.ni_vp; 935 cwdi->cwdi_rdir = vp; 936 937 /* 938 * Prevent escaping from chroot by putting the root under 939 * the working directory. Silently chdir to / if we aren't 940 * already there. 941 */ 942 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 943 /* 944 * XXX would be more failsafe to change directory to a 945 * deadfs node here instead 946 */ 947 vrele(cwdi->cwdi_cdir); 948 VREF(vp); 949 cwdi->cwdi_cdir = vp; 950 } 951 952 return (0); 953 } 954 955 /* 956 * Common routine for chroot and chdir. 957 */ 958 static int 959 change_dir(ndp, p) 960 struct nameidata *ndp; 961 struct proc *p; 962 { 963 struct vnode *vp; 964 int error; 965 966 if ((error = namei(ndp)) != 0) 967 return (error); 968 vp = ndp->ni_vp; 969 if (vp->v_type != VDIR) 970 error = ENOTDIR; 971 else 972 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 973 974 if (error) 975 vput(vp); 976 else 977 VOP_UNLOCK(vp, 0); 978 return (error); 979 } 980 981 /* 982 * Check permissions, allocate an open file structure, 983 * and call the device open routine if any. 984 */ 985 int 986 sys_open(p, v, retval) 987 struct proc *p; 988 void *v; 989 register_t *retval; 990 { 991 struct sys_open_args /* { 992 syscallarg(const char *) path; 993 syscallarg(int) flags; 994 syscallarg(int) mode; 995 } */ *uap = v; 996 struct cwdinfo *cwdi = p->p_cwdi; 997 struct filedesc *fdp = p->p_fd; 998 struct file *fp; 999 struct vnode *vp; 1000 int flags, cmode; 1001 int type, indx, error; 1002 struct flock lf; 1003 struct nameidata nd; 1004 1005 flags = FFLAGS(SCARG(uap, flags)); 1006 if ((flags & (FREAD | FWRITE)) == 0) 1007 return (EINVAL); 1008 /* falloc() will use the file descriptor for us */ 1009 if ((error = falloc(p, &fp, &indx)) != 0) 1010 return (error); 1011 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1012 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1013 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1014 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1015 FILE_UNUSE(fp, p); 1016 ffree(fp); 1017 if ((error == ENODEV || error == ENXIO) && 1018 p->p_dupfd >= 0 && /* XXX from fdopen */ 1019 (error = 1020 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1021 *retval = indx; 1022 return (0); 1023 } 1024 if (error == ERESTART) 1025 error = EINTR; 1026 fdremove(fdp, indx); 1027 return (error); 1028 } 1029 p->p_dupfd = 0; 1030 vp = nd.ni_vp; 1031 fp->f_flag = flags & FMASK; 1032 fp->f_type = DTYPE_VNODE; 1033 fp->f_ops = &vnops; 1034 fp->f_data = (caddr_t)vp; 1035 if (flags & (O_EXLOCK | O_SHLOCK)) { 1036 lf.l_whence = SEEK_SET; 1037 lf.l_start = 0; 1038 lf.l_len = 0; 1039 if (flags & O_EXLOCK) 1040 lf.l_type = F_WRLCK; 1041 else 1042 lf.l_type = F_RDLCK; 1043 type = F_FLOCK; 1044 if ((flags & FNONBLOCK) == 0) 1045 type |= F_WAIT; 1046 VOP_UNLOCK(vp, 0); 1047 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1048 if (error) { 1049 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1050 FILE_UNUSE(fp, p); 1051 ffree(fp); 1052 fdremove(fdp, indx); 1053 return (error); 1054 } 1055 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1056 fp->f_flag |= FHASLOCK; 1057 } 1058 VOP_UNLOCK(vp, 0); 1059 *retval = indx; 1060 FILE_SET_MATURE(fp); 1061 FILE_UNUSE(fp, p); 1062 return (0); 1063 } 1064 1065 /* 1066 * Get file handle system call 1067 */ 1068 int 1069 sys_getfh(p, v, retval) 1070 struct proc *p; 1071 void *v; 1072 register_t *retval; 1073 { 1074 struct sys_getfh_args /* { 1075 syscallarg(char *) fname; 1076 syscallarg(fhandle_t *) fhp; 1077 } */ *uap = v; 1078 struct vnode *vp; 1079 fhandle_t fh; 1080 int error; 1081 struct nameidata nd; 1082 1083 /* 1084 * Must be super user 1085 */ 1086 error = suser(p->p_ucred, &p->p_acflag); 1087 if (error) 1088 return (error); 1089 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1090 SCARG(uap, fname), p); 1091 error = namei(&nd); 1092 if (error) 1093 return (error); 1094 vp = nd.ni_vp; 1095 memset((caddr_t)&fh, 0, sizeof(fh)); 1096 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1097 error = VFS_VPTOFH(vp, &fh.fh_fid); 1098 vput(vp); 1099 if (error) 1100 return (error); 1101 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1102 return (error); 1103 } 1104 1105 /* 1106 * Open a file given a file handle. 1107 * 1108 * Check permissions, allocate an open file structure, 1109 * and call the device open routine if any. 1110 */ 1111 int 1112 sys_fhopen(p, v, retval) 1113 struct proc *p; 1114 void *v; 1115 register_t *retval; 1116 { 1117 struct sys_fhopen_args /* { 1118 syscallarg(const fhandle_t *) fhp; 1119 syscallarg(int) flags; 1120 } */ *uap = v; 1121 struct filedesc *fdp = p->p_fd; 1122 struct file *fp; 1123 struct vnode *vp = NULL; 1124 struct mount *mp; 1125 struct ucred *cred = p->p_ucred; 1126 int flags; 1127 struct file *nfp; 1128 int type, indx, error=0; 1129 struct flock lf; 1130 struct vattr va; 1131 fhandle_t fh; 1132 1133 /* 1134 * Must be super user 1135 */ 1136 if ((error = suser(p->p_ucred, &p->p_acflag))) 1137 return (error); 1138 1139 flags = FFLAGS(SCARG(uap, flags)); 1140 if ((flags & (FREAD | FWRITE)) == 0) 1141 return (EINVAL); 1142 if ((flags & O_CREAT)) 1143 return (EINVAL); 1144 /* falloc() will use the file descriptor for us */ 1145 if ((error = falloc(p, &nfp, &indx)) != 0) 1146 return (error); 1147 fp = nfp; 1148 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1149 goto bad; 1150 1151 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1152 error = ESTALE; 1153 goto bad; 1154 } 1155 1156 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1157 vp = NULL; /* most likely unnecessary sanity for bad: */ 1158 goto bad; 1159 } 1160 1161 /* Now do an effective vn_open */ 1162 1163 if (vp->v_type == VSOCK) { 1164 error = EOPNOTSUPP; 1165 goto bad; 1166 } 1167 if (flags & FREAD) { 1168 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1169 goto bad; 1170 } 1171 if (flags & (FWRITE | O_TRUNC)) { 1172 if (vp->v_type == VDIR) { 1173 error = EISDIR; 1174 goto bad; 1175 } 1176 if ((error = vn_writechk(vp)) != 0 || 1177 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1178 goto bad; 1179 } 1180 if (flags & O_TRUNC) { 1181 VOP_UNLOCK(vp, 0); /* XXX */ 1182 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1183 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1184 VATTR_NULL(&va); 1185 va.va_size = 0; 1186 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1187 goto bad; 1188 } 1189 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1190 goto bad; 1191 if (vp->v_type == VREG && 1192 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1193 error = EIO; 1194 goto bad; 1195 } 1196 if (flags & FWRITE) 1197 vp->v_writecount++; 1198 1199 /* done with modified vn_open, now finish what sys_open does. */ 1200 1201 fp->f_flag = flags & FMASK; 1202 fp->f_type = DTYPE_VNODE; 1203 fp->f_ops = &vnops; 1204 fp->f_data = (caddr_t)vp; 1205 if (flags & (O_EXLOCK | O_SHLOCK)) { 1206 lf.l_whence = SEEK_SET; 1207 lf.l_start = 0; 1208 lf.l_len = 0; 1209 if (flags & O_EXLOCK) 1210 lf.l_type = F_WRLCK; 1211 else 1212 lf.l_type = F_RDLCK; 1213 type = F_FLOCK; 1214 if ((flags & FNONBLOCK) == 0) 1215 type |= F_WAIT; 1216 VOP_UNLOCK(vp, 0); 1217 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1218 if (error) { 1219 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1220 FILE_UNUSE(fp, p); 1221 ffree(fp); 1222 fdremove(fdp, indx); 1223 return (error); 1224 } 1225 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1226 fp->f_flag |= FHASLOCK; 1227 } 1228 VOP_UNLOCK(vp, 0); 1229 *retval = indx; 1230 FILE_SET_MATURE(fp); 1231 FILE_UNUSE(fp, p); 1232 return (0); 1233 1234 bad: 1235 FILE_UNUSE(fp, p); 1236 ffree(fp); 1237 fdremove(fdp, indx); 1238 if (vp != NULL) 1239 vput(vp); 1240 return (error); 1241 } 1242 1243 /* ARGSUSED */ 1244 int 1245 sys_fhstat(p, v, retval) 1246 struct proc *p; 1247 void *v; 1248 register_t *retval; 1249 { 1250 struct sys_fhstat_args /* { 1251 syscallarg(const fhandle_t *) fhp; 1252 syscallarg(struct stat *) sb; 1253 } */ *uap = v; 1254 struct stat sb; 1255 int error; 1256 fhandle_t fh; 1257 struct mount *mp; 1258 struct vnode *vp; 1259 1260 /* 1261 * Must be super user 1262 */ 1263 if ((error = suser(p->p_ucred, &p->p_acflag))) 1264 return (error); 1265 1266 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1267 return (error); 1268 1269 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1270 return (ESTALE); 1271 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1272 return (error); 1273 error = vn_stat(vp, &sb, p); 1274 vput(vp); 1275 if (error) 1276 return (error); 1277 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1278 return (error); 1279 } 1280 1281 /* ARGSUSED */ 1282 int 1283 sys_fhstatfs(p, v, retval) 1284 struct proc *p; 1285 void *v; 1286 register_t *retval; 1287 { 1288 struct sys_fhstatfs_args /* 1289 syscallarg(const fhandle_t *) fhp; 1290 syscallarg(struct statfs *) buf; 1291 } */ *uap = v; 1292 struct statfs sp; 1293 fhandle_t fh; 1294 struct mount *mp; 1295 struct vnode *vp; 1296 int error; 1297 1298 /* 1299 * Must be super user 1300 */ 1301 if ((error = suser(p->p_ucred, &p->p_acflag))) 1302 return (error); 1303 1304 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1305 return (error); 1306 1307 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1308 return (ESTALE); 1309 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1310 return (error); 1311 mp = vp->v_mount; 1312 vput(vp); 1313 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1314 return (error); 1315 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1316 sp.f_oflags = sp.f_flags & 0xffff; 1317 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1318 } 1319 1320 /* 1321 * Create a special file. 1322 */ 1323 /* ARGSUSED */ 1324 int 1325 sys_mknod(p, v, retval) 1326 struct proc *p; 1327 void *v; 1328 register_t *retval; 1329 { 1330 struct sys_mknod_args /* { 1331 syscallarg(const char *) path; 1332 syscallarg(int) mode; 1333 syscallarg(int) dev; 1334 } */ *uap = v; 1335 struct vnode *vp; 1336 struct vattr vattr; 1337 int error; 1338 int whiteout = 0; 1339 struct nameidata nd; 1340 1341 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1342 return (error); 1343 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1344 if ((error = namei(&nd)) != 0) 1345 return (error); 1346 vp = nd.ni_vp; 1347 if (vp != NULL) 1348 error = EEXIST; 1349 else { 1350 VATTR_NULL(&vattr); 1351 vattr.va_mode = 1352 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1353 vattr.va_rdev = SCARG(uap, dev); 1354 whiteout = 0; 1355 1356 switch (SCARG(uap, mode) & S_IFMT) { 1357 case S_IFMT: /* used by badsect to flag bad sectors */ 1358 vattr.va_type = VBAD; 1359 break; 1360 case S_IFCHR: 1361 vattr.va_type = VCHR; 1362 break; 1363 case S_IFBLK: 1364 vattr.va_type = VBLK; 1365 break; 1366 case S_IFWHT: 1367 whiteout = 1; 1368 break; 1369 default: 1370 error = EINVAL; 1371 break; 1372 } 1373 } 1374 if (!error) { 1375 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1376 if (whiteout) { 1377 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1378 if (error) 1379 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1380 vput(nd.ni_dvp); 1381 } else { 1382 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1383 &nd.ni_cnd, &vattr); 1384 } 1385 } else { 1386 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1387 if (nd.ni_dvp == vp) 1388 vrele(nd.ni_dvp); 1389 else 1390 vput(nd.ni_dvp); 1391 if (vp) 1392 vrele(vp); 1393 } 1394 return (error); 1395 } 1396 1397 /* 1398 * Create a named pipe. 1399 */ 1400 /* ARGSUSED */ 1401 int 1402 sys_mkfifo(p, v, retval) 1403 struct proc *p; 1404 void *v; 1405 register_t *retval; 1406 { 1407 struct sys_mkfifo_args /* { 1408 syscallarg(const char *) path; 1409 syscallarg(int) mode; 1410 } */ *uap = v; 1411 struct vattr vattr; 1412 int error; 1413 struct nameidata nd; 1414 1415 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1416 if ((error = namei(&nd)) != 0) 1417 return (error); 1418 if (nd.ni_vp != NULL) { 1419 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1420 if (nd.ni_dvp == nd.ni_vp) 1421 vrele(nd.ni_dvp); 1422 else 1423 vput(nd.ni_dvp); 1424 vrele(nd.ni_vp); 1425 return (EEXIST); 1426 } 1427 VATTR_NULL(&vattr); 1428 vattr.va_type = VFIFO; 1429 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1430 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1431 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1432 } 1433 1434 /* 1435 * Make a hard file link. 1436 */ 1437 /* ARGSUSED */ 1438 int 1439 sys_link(p, v, retval) 1440 struct proc *p; 1441 void *v; 1442 register_t *retval; 1443 { 1444 struct sys_link_args /* { 1445 syscallarg(const char *) path; 1446 syscallarg(const char *) link; 1447 } */ *uap = v; 1448 struct vnode *vp; 1449 struct nameidata nd; 1450 int error; 1451 1452 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1453 if ((error = namei(&nd)) != 0) 1454 return (error); 1455 vp = nd.ni_vp; 1456 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1457 if ((error = namei(&nd)) != 0) 1458 goto out; 1459 if (nd.ni_vp) { 1460 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1461 if (nd.ni_dvp == nd.ni_vp) 1462 vrele(nd.ni_dvp); 1463 else 1464 vput(nd.ni_dvp); 1465 vrele(nd.ni_vp); 1466 error = EEXIST; 1467 goto out; 1468 } 1469 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1470 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1471 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1472 out: 1473 vrele(vp); 1474 return (error); 1475 } 1476 1477 /* 1478 * Make a symbolic link. 1479 */ 1480 /* ARGSUSED */ 1481 int 1482 sys_symlink(p, v, retval) 1483 struct proc *p; 1484 void *v; 1485 register_t *retval; 1486 { 1487 struct sys_symlink_args /* { 1488 syscallarg(const char *) path; 1489 syscallarg(const char *) link; 1490 } */ *uap = v; 1491 struct vattr vattr; 1492 char *path; 1493 int error; 1494 struct nameidata nd; 1495 1496 path = PNBUF_GET(); 1497 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1498 if (error) 1499 goto out; 1500 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1501 if ((error = namei(&nd)) != 0) 1502 goto out; 1503 if (nd.ni_vp) { 1504 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1505 if (nd.ni_dvp == nd.ni_vp) 1506 vrele(nd.ni_dvp); 1507 else 1508 vput(nd.ni_dvp); 1509 vrele(nd.ni_vp); 1510 error = EEXIST; 1511 goto out; 1512 } 1513 VATTR_NULL(&vattr); 1514 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1515 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1516 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1517 out: 1518 PNBUF_PUT(path); 1519 return (error); 1520 } 1521 1522 /* 1523 * Delete a whiteout from the filesystem. 1524 */ 1525 /* ARGSUSED */ 1526 int 1527 sys_undelete(p, v, retval) 1528 struct proc *p; 1529 void *v; 1530 register_t *retval; 1531 { 1532 struct sys_undelete_args /* { 1533 syscallarg(const char *) path; 1534 } */ *uap = v; 1535 int error; 1536 struct nameidata nd; 1537 1538 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1539 SCARG(uap, path), p); 1540 error = namei(&nd); 1541 if (error) 1542 return (error); 1543 1544 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1545 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1546 if (nd.ni_dvp == nd.ni_vp) 1547 vrele(nd.ni_dvp); 1548 else 1549 vput(nd.ni_dvp); 1550 if (nd.ni_vp) 1551 vrele(nd.ni_vp); 1552 return (EEXIST); 1553 } 1554 1555 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1556 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1557 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1558 vput(nd.ni_dvp); 1559 return (error); 1560 } 1561 1562 /* 1563 * Delete a name from the filesystem. 1564 */ 1565 /* ARGSUSED */ 1566 int 1567 sys_unlink(p, v, retval) 1568 struct proc *p; 1569 void *v; 1570 register_t *retval; 1571 { 1572 struct sys_unlink_args /* { 1573 syscallarg(const char *) path; 1574 } */ *uap = v; 1575 struct vnode *vp; 1576 int error; 1577 struct nameidata nd; 1578 1579 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1580 SCARG(uap, path), p); 1581 if ((error = namei(&nd)) != 0) 1582 return (error); 1583 vp = nd.ni_vp; 1584 1585 /* 1586 * The root of a mounted filesystem cannot be deleted. 1587 */ 1588 if (vp->v_flag & VROOT) { 1589 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1590 if (nd.ni_dvp == vp) 1591 vrele(nd.ni_dvp); 1592 else 1593 vput(nd.ni_dvp); 1594 vput(vp); 1595 error = EBUSY; 1596 goto out; 1597 } 1598 1599 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1600 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1601 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1602 out: 1603 return (error); 1604 } 1605 1606 /* 1607 * Reposition read/write file offset. 1608 */ 1609 int 1610 sys_lseek(p, v, retval) 1611 struct proc *p; 1612 void *v; 1613 register_t *retval; 1614 { 1615 struct sys_lseek_args /* { 1616 syscallarg(int) fd; 1617 syscallarg(int) pad; 1618 syscallarg(off_t) offset; 1619 syscallarg(int) whence; 1620 } */ *uap = v; 1621 struct ucred *cred = p->p_ucred; 1622 struct filedesc *fdp = p->p_fd; 1623 struct file *fp; 1624 struct vnode *vp; 1625 struct vattr vattr; 1626 off_t newoff; 1627 int error; 1628 1629 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1630 return (EBADF); 1631 1632 FILE_USE(fp); 1633 1634 vp = (struct vnode *)fp->f_data; 1635 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1636 error = ESPIPE; 1637 goto out; 1638 } 1639 1640 switch (SCARG(uap, whence)) { 1641 case SEEK_CUR: 1642 newoff = fp->f_offset + SCARG(uap, offset); 1643 break; 1644 case SEEK_END: 1645 error = VOP_GETATTR(vp, &vattr, cred, p); 1646 if (error) 1647 goto out; 1648 newoff = SCARG(uap, offset) + vattr.va_size; 1649 break; 1650 case SEEK_SET: 1651 newoff = SCARG(uap, offset); 1652 break; 1653 default: 1654 error = EINVAL; 1655 goto out; 1656 } 1657 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1658 goto out; 1659 1660 *(off_t *)retval = fp->f_offset = newoff; 1661 out: 1662 FILE_UNUSE(fp, p); 1663 return (error); 1664 } 1665 1666 /* 1667 * Positional read system call. 1668 */ 1669 int 1670 sys_pread(p, v, retval) 1671 struct proc *p; 1672 void *v; 1673 register_t *retval; 1674 { 1675 struct sys_pread_args /* { 1676 syscallarg(int) fd; 1677 syscallarg(void *) buf; 1678 syscallarg(size_t) nbyte; 1679 syscallarg(off_t) offset; 1680 } */ *uap = v; 1681 struct filedesc *fdp = p->p_fd; 1682 struct file *fp; 1683 struct vnode *vp; 1684 off_t offset; 1685 int error, fd = SCARG(uap, fd); 1686 1687 if ((fp = fd_getfile(fdp, fd)) == NULL) 1688 return (EBADF); 1689 1690 if ((fp->f_flag & FREAD) == 0) 1691 return (EBADF); 1692 1693 FILE_USE(fp); 1694 1695 vp = (struct vnode *)fp->f_data; 1696 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1697 error = ESPIPE; 1698 goto out; 1699 } 1700 1701 offset = SCARG(uap, offset); 1702 1703 /* 1704 * XXX This works because no file systems actually 1705 * XXX take any action on the seek operation. 1706 */ 1707 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1708 goto out; 1709 1710 /* dofileread() will unuse the descriptor for us */ 1711 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1712 &offset, 0, retval)); 1713 1714 out: 1715 FILE_UNUSE(fp, p); 1716 return (error); 1717 } 1718 1719 /* 1720 * Positional scatter read system call. 1721 */ 1722 int 1723 sys_preadv(p, v, retval) 1724 struct proc *p; 1725 void *v; 1726 register_t *retval; 1727 { 1728 struct sys_preadv_args /* { 1729 syscallarg(int) fd; 1730 syscallarg(const struct iovec *) iovp; 1731 syscallarg(int) iovcnt; 1732 syscallarg(off_t) offset; 1733 } */ *uap = v; 1734 struct filedesc *fdp = p->p_fd; 1735 struct file *fp; 1736 struct vnode *vp; 1737 off_t offset; 1738 int error, fd = SCARG(uap, fd); 1739 1740 if ((fp = fd_getfile(fdp, fd)) == NULL) 1741 return (EBADF); 1742 1743 if ((fp->f_flag & FREAD) == 0) 1744 return (EBADF); 1745 1746 FILE_USE(fp); 1747 1748 vp = (struct vnode *)fp->f_data; 1749 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1750 error = ESPIPE; 1751 goto out; 1752 } 1753 1754 offset = SCARG(uap, offset); 1755 1756 /* 1757 * XXX This works because no file systems actually 1758 * XXX take any action on the seek operation. 1759 */ 1760 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1761 goto out; 1762 1763 /* dofilereadv() will unuse the descriptor for us */ 1764 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1765 &offset, 0, retval)); 1766 1767 out: 1768 FILE_UNUSE(fp, p); 1769 return (error); 1770 } 1771 1772 /* 1773 * Positional write system call. 1774 */ 1775 int 1776 sys_pwrite(p, v, retval) 1777 struct proc *p; 1778 void *v; 1779 register_t *retval; 1780 { 1781 struct sys_pwrite_args /* { 1782 syscallarg(int) fd; 1783 syscallarg(const void *) buf; 1784 syscallarg(size_t) nbyte; 1785 syscallarg(off_t) offset; 1786 } */ *uap = v; 1787 struct filedesc *fdp = p->p_fd; 1788 struct file *fp; 1789 struct vnode *vp; 1790 off_t offset; 1791 int error, fd = SCARG(uap, fd); 1792 1793 if ((fp = fd_getfile(fdp, fd)) == NULL) 1794 return (EBADF); 1795 1796 if ((fp->f_flag & FWRITE) == 0) 1797 return (EBADF); 1798 1799 FILE_USE(fp); 1800 1801 vp = (struct vnode *)fp->f_data; 1802 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1803 error = ESPIPE; 1804 goto out; 1805 } 1806 1807 offset = SCARG(uap, offset); 1808 1809 /* 1810 * XXX This works because no file systems actually 1811 * XXX take any action on the seek operation. 1812 */ 1813 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1814 goto out; 1815 1816 /* dofilewrite() will unuse the descriptor for us */ 1817 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1818 &offset, 0, retval)); 1819 1820 out: 1821 FILE_UNUSE(fp, p); 1822 return (error); 1823 } 1824 1825 /* 1826 * Positional gather write system call. 1827 */ 1828 int 1829 sys_pwritev(p, v, retval) 1830 struct proc *p; 1831 void *v; 1832 register_t *retval; 1833 { 1834 struct sys_pwritev_args /* { 1835 syscallarg(int) fd; 1836 syscallarg(const struct iovec *) iovp; 1837 syscallarg(int) iovcnt; 1838 syscallarg(off_t) offset; 1839 } */ *uap = v; 1840 struct filedesc *fdp = p->p_fd; 1841 struct file *fp; 1842 struct vnode *vp; 1843 off_t offset; 1844 int error, fd = SCARG(uap, fd); 1845 1846 if ((fp = fd_getfile(fdp, fd)) == NULL) 1847 return (EBADF); 1848 1849 if ((fp->f_flag & FWRITE) == 0) 1850 return (EBADF); 1851 1852 FILE_USE(fp); 1853 1854 vp = (struct vnode *)fp->f_data; 1855 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1856 error = ESPIPE; 1857 goto out; 1858 } 1859 1860 offset = SCARG(uap, offset); 1861 1862 /* 1863 * XXX This works because no file systems actually 1864 * XXX take any action on the seek operation. 1865 */ 1866 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1867 goto out; 1868 1869 /* dofilewritev() will unuse the descriptor for us */ 1870 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1871 &offset, 0, retval)); 1872 1873 out: 1874 FILE_UNUSE(fp, p); 1875 return (error); 1876 } 1877 1878 /* 1879 * Check access permissions. 1880 */ 1881 int 1882 sys_access(p, v, retval) 1883 struct proc *p; 1884 void *v; 1885 register_t *retval; 1886 { 1887 struct sys_access_args /* { 1888 syscallarg(const char *) path; 1889 syscallarg(int) flags; 1890 } */ *uap = v; 1891 struct ucred *cred = p->p_ucred; 1892 struct vnode *vp; 1893 int error, flags, t_gid, t_uid; 1894 struct nameidata nd; 1895 1896 t_uid = cred->cr_uid; 1897 t_gid = cred->cr_gid; 1898 cred->cr_uid = p->p_cred->p_ruid; 1899 cred->cr_gid = p->p_cred->p_rgid; 1900 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1901 SCARG(uap, path), p); 1902 if ((error = namei(&nd)) != 0) 1903 goto out1; 1904 vp = nd.ni_vp; 1905 1906 /* Flags == 0 means only check for existence. */ 1907 if (SCARG(uap, flags)) { 1908 flags = 0; 1909 if (SCARG(uap, flags) & R_OK) 1910 flags |= VREAD; 1911 if (SCARG(uap, flags) & W_OK) 1912 flags |= VWRITE; 1913 if (SCARG(uap, flags) & X_OK) 1914 flags |= VEXEC; 1915 1916 error = VOP_ACCESS(vp, flags, cred, p); 1917 if (!error && (flags & VWRITE)) 1918 error = vn_writechk(vp); 1919 } 1920 vput(vp); 1921 out1: 1922 cred->cr_uid = t_uid; 1923 cred->cr_gid = t_gid; 1924 return (error); 1925 } 1926 1927 /* 1928 * Get file status; this version follows links. 1929 */ 1930 /* ARGSUSED */ 1931 int 1932 sys___stat13(p, v, retval) 1933 struct proc *p; 1934 void *v; 1935 register_t *retval; 1936 { 1937 struct sys___stat13_args /* { 1938 syscallarg(const char *) path; 1939 syscallarg(struct stat *) ub; 1940 } */ *uap = v; 1941 struct stat sb; 1942 int error; 1943 struct nameidata nd; 1944 1945 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1946 SCARG(uap, path), p); 1947 if ((error = namei(&nd)) != 0) 1948 return (error); 1949 error = vn_stat(nd.ni_vp, &sb, p); 1950 vput(nd.ni_vp); 1951 if (error) 1952 return (error); 1953 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1954 return (error); 1955 } 1956 1957 /* 1958 * Get file status; this version does not follow links. 1959 */ 1960 /* ARGSUSED */ 1961 int 1962 sys___lstat13(p, v, retval) 1963 struct proc *p; 1964 void *v; 1965 register_t *retval; 1966 { 1967 struct sys___lstat13_args /* { 1968 syscallarg(const char *) path; 1969 syscallarg(struct stat *) ub; 1970 } */ *uap = v; 1971 struct stat sb; 1972 int error; 1973 struct nameidata nd; 1974 1975 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1976 SCARG(uap, path), p); 1977 if ((error = namei(&nd)) != 0) 1978 return (error); 1979 error = vn_stat(nd.ni_vp, &sb, p); 1980 vput(nd.ni_vp); 1981 if (error) 1982 return (error); 1983 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1984 return (error); 1985 } 1986 1987 /* 1988 * Get configurable pathname variables. 1989 */ 1990 /* ARGSUSED */ 1991 int 1992 sys_pathconf(p, v, retval) 1993 struct proc *p; 1994 void *v; 1995 register_t *retval; 1996 { 1997 struct sys_pathconf_args /* { 1998 syscallarg(const char *) path; 1999 syscallarg(int) name; 2000 } */ *uap = v; 2001 int error; 2002 struct nameidata nd; 2003 2004 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2005 SCARG(uap, path), p); 2006 if ((error = namei(&nd)) != 0) 2007 return (error); 2008 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2009 vput(nd.ni_vp); 2010 return (error); 2011 } 2012 2013 /* 2014 * Return target name of a symbolic link. 2015 */ 2016 /* ARGSUSED */ 2017 int 2018 sys_readlink(p, v, retval) 2019 struct proc *p; 2020 void *v; 2021 register_t *retval; 2022 { 2023 struct sys_readlink_args /* { 2024 syscallarg(const char *) path; 2025 syscallarg(char *) buf; 2026 syscallarg(size_t) count; 2027 } */ *uap = v; 2028 struct vnode *vp; 2029 struct iovec aiov; 2030 struct uio auio; 2031 int error; 2032 struct nameidata nd; 2033 2034 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2035 SCARG(uap, path), p); 2036 if ((error = namei(&nd)) != 0) 2037 return (error); 2038 vp = nd.ni_vp; 2039 if (vp->v_type != VLNK) 2040 error = EINVAL; 2041 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2042 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2043 aiov.iov_base = SCARG(uap, buf); 2044 aiov.iov_len = SCARG(uap, count); 2045 auio.uio_iov = &aiov; 2046 auio.uio_iovcnt = 1; 2047 auio.uio_offset = 0; 2048 auio.uio_rw = UIO_READ; 2049 auio.uio_segflg = UIO_USERSPACE; 2050 auio.uio_procp = p; 2051 auio.uio_resid = SCARG(uap, count); 2052 error = VOP_READLINK(vp, &auio, p->p_ucred); 2053 } 2054 vput(vp); 2055 *retval = SCARG(uap, count) - auio.uio_resid; 2056 return (error); 2057 } 2058 2059 /* 2060 * Change flags of a file given a path name. 2061 */ 2062 /* ARGSUSED */ 2063 int 2064 sys_chflags(p, v, retval) 2065 struct proc *p; 2066 void *v; 2067 register_t *retval; 2068 { 2069 struct sys_chflags_args /* { 2070 syscallarg(const char *) path; 2071 syscallarg(u_long) flags; 2072 } */ *uap = v; 2073 struct vnode *vp; 2074 int error; 2075 struct nameidata nd; 2076 2077 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2078 if ((error = namei(&nd)) != 0) 2079 return (error); 2080 vp = nd.ni_vp; 2081 error = change_flags(vp, SCARG(uap, flags), p); 2082 vput(vp); 2083 return (error); 2084 } 2085 2086 /* 2087 * Change flags of a file given a file descriptor. 2088 */ 2089 /* ARGSUSED */ 2090 int 2091 sys_fchflags(p, v, retval) 2092 struct proc *p; 2093 void *v; 2094 register_t *retval; 2095 { 2096 struct sys_fchflags_args /* { 2097 syscallarg(int) fd; 2098 syscallarg(u_long) flags; 2099 } */ *uap = v; 2100 struct vnode *vp; 2101 struct file *fp; 2102 int error; 2103 2104 /* getvnode() will use the descriptor for us */ 2105 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2106 return (error); 2107 vp = (struct vnode *)fp->f_data; 2108 error = change_flags(vp, SCARG(uap, flags), p); 2109 VOP_UNLOCK(vp, 0); 2110 FILE_UNUSE(fp, p); 2111 return (error); 2112 } 2113 2114 /* 2115 * Change flags of a file given a path name; this version does 2116 * not follow links. 2117 */ 2118 int 2119 sys_lchflags(p, v, retval) 2120 struct proc *p; 2121 void *v; 2122 register_t *retval; 2123 { 2124 struct sys_lchflags_args /* { 2125 syscallarg(const char *) path; 2126 syscallarg(u_long) flags; 2127 } */ *uap = v; 2128 struct vnode *vp; 2129 int error; 2130 struct nameidata nd; 2131 2132 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2133 if ((error = namei(&nd)) != 0) 2134 return (error); 2135 vp = nd.ni_vp; 2136 error = change_flags(vp, SCARG(uap, flags), p); 2137 vput(vp); 2138 return (error); 2139 } 2140 2141 /* 2142 * Common routine to change flags of a file. 2143 */ 2144 int 2145 change_flags(vp, flags, p) 2146 struct vnode *vp; 2147 u_long flags; 2148 struct proc *p; 2149 { 2150 struct vattr vattr; 2151 int error; 2152 2153 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2154 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2155 /* 2156 * Non-superusers cannot change the flags on devices, even if they 2157 * own them. 2158 */ 2159 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2160 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2161 goto out; 2162 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2163 error = EINVAL; 2164 goto out; 2165 } 2166 } 2167 VATTR_NULL(&vattr); 2168 vattr.va_flags = flags; 2169 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2170 out: 2171 return (error); 2172 } 2173 2174 /* 2175 * Change mode of a file given path name; this version follows links. 2176 */ 2177 /* ARGSUSED */ 2178 int 2179 sys_chmod(p, v, retval) 2180 struct proc *p; 2181 void *v; 2182 register_t *retval; 2183 { 2184 struct sys_chmod_args /* { 2185 syscallarg(const char *) path; 2186 syscallarg(int) mode; 2187 } */ *uap = v; 2188 int error; 2189 struct nameidata nd; 2190 2191 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2192 if ((error = namei(&nd)) != 0) 2193 return (error); 2194 2195 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2196 2197 vrele(nd.ni_vp); 2198 return (error); 2199 } 2200 2201 /* 2202 * Change mode of a file given a file descriptor. 2203 */ 2204 /* ARGSUSED */ 2205 int 2206 sys_fchmod(p, v, retval) 2207 struct proc *p; 2208 void *v; 2209 register_t *retval; 2210 { 2211 struct sys_fchmod_args /* { 2212 syscallarg(int) fd; 2213 syscallarg(int) mode; 2214 } */ *uap = v; 2215 struct file *fp; 2216 int error; 2217 2218 /* getvnode() will use the descriptor for us */ 2219 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2220 return (error); 2221 2222 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2223 FILE_UNUSE(fp, p); 2224 return (error); 2225 } 2226 2227 /* 2228 * Change mode of a file given path name; this version does not follow links. 2229 */ 2230 /* ARGSUSED */ 2231 int 2232 sys_lchmod(p, v, retval) 2233 struct proc *p; 2234 void *v; 2235 register_t *retval; 2236 { 2237 struct sys_lchmod_args /* { 2238 syscallarg(const char *) path; 2239 syscallarg(int) mode; 2240 } */ *uap = v; 2241 int error; 2242 struct nameidata nd; 2243 2244 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2245 if ((error = namei(&nd)) != 0) 2246 return (error); 2247 2248 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2249 2250 vrele(nd.ni_vp); 2251 return (error); 2252 } 2253 2254 /* 2255 * Common routine to set mode given a vnode. 2256 */ 2257 static int 2258 change_mode(vp, mode, p) 2259 struct vnode *vp; 2260 int mode; 2261 struct proc *p; 2262 { 2263 struct vattr vattr; 2264 int error; 2265 2266 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2267 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2268 VATTR_NULL(&vattr); 2269 vattr.va_mode = mode & ALLPERMS; 2270 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2271 VOP_UNLOCK(vp, 0); 2272 return (error); 2273 } 2274 2275 /* 2276 * Set ownership given a path name; this version follows links. 2277 */ 2278 /* ARGSUSED */ 2279 int 2280 sys_chown(p, v, retval) 2281 struct proc *p; 2282 void *v; 2283 register_t *retval; 2284 { 2285 struct sys_chown_args /* { 2286 syscallarg(const char *) path; 2287 syscallarg(uid_t) uid; 2288 syscallarg(gid_t) gid; 2289 } */ *uap = v; 2290 int error; 2291 struct nameidata nd; 2292 2293 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2294 if ((error = namei(&nd)) != 0) 2295 return (error); 2296 2297 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2298 2299 vrele(nd.ni_vp); 2300 return (error); 2301 } 2302 2303 /* 2304 * Set ownership given a path name; this version follows links. 2305 * Provides POSIX semantics. 2306 */ 2307 /* ARGSUSED */ 2308 int 2309 sys___posix_chown(p, v, retval) 2310 struct proc *p; 2311 void *v; 2312 register_t *retval; 2313 { 2314 struct sys_chown_args /* { 2315 syscallarg(const char *) path; 2316 syscallarg(uid_t) uid; 2317 syscallarg(gid_t) gid; 2318 } */ *uap = v; 2319 int error; 2320 struct nameidata nd; 2321 2322 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2323 if ((error = namei(&nd)) != 0) 2324 return (error); 2325 2326 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2327 2328 vrele(nd.ni_vp); 2329 return (error); 2330 } 2331 2332 /* 2333 * Set ownership given a file descriptor. 2334 */ 2335 /* ARGSUSED */ 2336 int 2337 sys_fchown(p, v, retval) 2338 struct proc *p; 2339 void *v; 2340 register_t *retval; 2341 { 2342 struct sys_fchown_args /* { 2343 syscallarg(int) fd; 2344 syscallarg(uid_t) uid; 2345 syscallarg(gid_t) gid; 2346 } */ *uap = v; 2347 int error; 2348 struct file *fp; 2349 2350 /* getvnode() will use the descriptor for us */ 2351 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2352 return (error); 2353 2354 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2355 SCARG(uap, gid), p, 0); 2356 FILE_UNUSE(fp, p); 2357 return (error); 2358 } 2359 2360 /* 2361 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2362 */ 2363 /* ARGSUSED */ 2364 int 2365 sys___posix_fchown(p, v, retval) 2366 struct proc *p; 2367 void *v; 2368 register_t *retval; 2369 { 2370 struct sys_fchown_args /* { 2371 syscallarg(int) fd; 2372 syscallarg(uid_t) uid; 2373 syscallarg(gid_t) gid; 2374 } */ *uap = v; 2375 int error; 2376 struct file *fp; 2377 2378 /* getvnode() will use the descriptor for us */ 2379 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2380 return (error); 2381 2382 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2383 SCARG(uap, gid), p, 1); 2384 FILE_UNUSE(fp, p); 2385 return (error); 2386 } 2387 2388 /* 2389 * Set ownership given a path name; this version does not follow links. 2390 */ 2391 /* ARGSUSED */ 2392 int 2393 sys_lchown(p, v, retval) 2394 struct proc *p; 2395 void *v; 2396 register_t *retval; 2397 { 2398 struct sys_lchown_args /* { 2399 syscallarg(const char *) path; 2400 syscallarg(uid_t) uid; 2401 syscallarg(gid_t) gid; 2402 } */ *uap = v; 2403 int error; 2404 struct nameidata nd; 2405 2406 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2407 if ((error = namei(&nd)) != 0) 2408 return (error); 2409 2410 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2411 2412 vrele(nd.ni_vp); 2413 return (error); 2414 } 2415 2416 /* 2417 * Set ownership given a path name; this version does not follow links. 2418 * Provides POSIX/XPG semantics. 2419 */ 2420 /* ARGSUSED */ 2421 int 2422 sys___posix_lchown(p, v, retval) 2423 struct proc *p; 2424 void *v; 2425 register_t *retval; 2426 { 2427 struct sys_lchown_args /* { 2428 syscallarg(const char *) path; 2429 syscallarg(uid_t) uid; 2430 syscallarg(gid_t) gid; 2431 } */ *uap = v; 2432 int error; 2433 struct nameidata nd; 2434 2435 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2436 if ((error = namei(&nd)) != 0) 2437 return (error); 2438 2439 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2440 2441 vrele(nd.ni_vp); 2442 return (error); 2443 } 2444 2445 /* 2446 * Common routine to set ownership given a vnode. 2447 */ 2448 static int 2449 change_owner(vp, uid, gid, p, posix_semantics) 2450 struct vnode *vp; 2451 uid_t uid; 2452 gid_t gid; 2453 struct proc *p; 2454 int posix_semantics; 2455 { 2456 struct vattr vattr; 2457 mode_t newmode; 2458 int error; 2459 2460 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2461 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2462 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2463 goto out; 2464 2465 #define CHANGED(x) ((x) != -1) 2466 newmode = vattr.va_mode; 2467 if (posix_semantics) { 2468 /* 2469 * POSIX/XPG semantics: if the caller is not the super-user, 2470 * clear set-user-id and set-group-id bits. Both POSIX and 2471 * the XPG consider the behaviour for calls by the super-user 2472 * implementation-defined; we leave the set-user-id and set- 2473 * group-id settings intact in that case. 2474 */ 2475 if (suser(p->p_ucred, NULL) != 0) 2476 newmode &= ~(S_ISUID | S_ISGID); 2477 } else { 2478 /* 2479 * NetBSD semantics: when changing owner and/or group, 2480 * clear the respective bit(s). 2481 */ 2482 if (CHANGED(uid)) 2483 newmode &= ~S_ISUID; 2484 if (CHANGED(gid)) 2485 newmode &= ~S_ISGID; 2486 } 2487 /* Update va_mode iff altered. */ 2488 if (vattr.va_mode == newmode) 2489 newmode = VNOVAL; 2490 2491 VATTR_NULL(&vattr); 2492 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2493 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2494 vattr.va_mode = newmode; 2495 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2496 #undef CHANGED 2497 2498 out: 2499 VOP_UNLOCK(vp, 0); 2500 return (error); 2501 } 2502 2503 /* 2504 * Set the access and modification times given a path name; this 2505 * version follows links. 2506 */ 2507 /* ARGSUSED */ 2508 int 2509 sys_utimes(p, v, retval) 2510 struct proc *p; 2511 void *v; 2512 register_t *retval; 2513 { 2514 struct sys_utimes_args /* { 2515 syscallarg(const char *) path; 2516 syscallarg(const struct timeval *) tptr; 2517 } */ *uap = v; 2518 int error; 2519 struct nameidata nd; 2520 2521 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2522 if ((error = namei(&nd)) != 0) 2523 return (error); 2524 2525 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2526 2527 vrele(nd.ni_vp); 2528 return (error); 2529 } 2530 2531 /* 2532 * Set the access and modification times given a file descriptor. 2533 */ 2534 /* ARGSUSED */ 2535 int 2536 sys_futimes(p, v, retval) 2537 struct proc *p; 2538 void *v; 2539 register_t *retval; 2540 { 2541 struct sys_futimes_args /* { 2542 syscallarg(int) fd; 2543 syscallarg(const struct timeval *) tptr; 2544 } */ *uap = v; 2545 int error; 2546 struct file *fp; 2547 2548 /* getvnode() will use the descriptor for us */ 2549 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2550 return (error); 2551 2552 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2553 FILE_UNUSE(fp, p); 2554 return (error); 2555 } 2556 2557 /* 2558 * Set the access and modification times given a path name; this 2559 * version does not follow links. 2560 */ 2561 /* ARGSUSED */ 2562 int 2563 sys_lutimes(p, v, retval) 2564 struct proc *p; 2565 void *v; 2566 register_t *retval; 2567 { 2568 struct sys_lutimes_args /* { 2569 syscallarg(const char *) path; 2570 syscallarg(const struct timeval *) tptr; 2571 } */ *uap = v; 2572 int error; 2573 struct nameidata nd; 2574 2575 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2576 if ((error = namei(&nd)) != 0) 2577 return (error); 2578 2579 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2580 2581 vrele(nd.ni_vp); 2582 return (error); 2583 } 2584 2585 /* 2586 * Common routine to set access and modification times given a vnode. 2587 */ 2588 static int 2589 change_utimes(vp, tptr, p) 2590 struct vnode *vp; 2591 const struct timeval *tptr; 2592 struct proc *p; 2593 { 2594 struct timeval tv[2]; 2595 struct vattr vattr; 2596 int error; 2597 2598 VATTR_NULL(&vattr); 2599 if (tptr == NULL) { 2600 microtime(&tv[0]); 2601 tv[1] = tv[0]; 2602 vattr.va_vaflags |= VA_UTIMES_NULL; 2603 } else { 2604 error = copyin(tptr, tv, sizeof(tv)); 2605 if (error) 2606 return (error); 2607 } 2608 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2609 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2610 vattr.va_atime.tv_sec = tv[0].tv_sec; 2611 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2612 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2613 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2614 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2615 VOP_UNLOCK(vp, 0); 2616 return (error); 2617 } 2618 2619 /* 2620 * Truncate a file given its path name. 2621 */ 2622 /* ARGSUSED */ 2623 int 2624 sys_truncate(p, v, retval) 2625 struct proc *p; 2626 void *v; 2627 register_t *retval; 2628 { 2629 struct sys_truncate_args /* { 2630 syscallarg(const char *) path; 2631 syscallarg(int) pad; 2632 syscallarg(off_t) length; 2633 } */ *uap = v; 2634 struct vnode *vp; 2635 struct vattr vattr; 2636 int error; 2637 struct nameidata nd; 2638 2639 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2640 if ((error = namei(&nd)) != 0) 2641 return (error); 2642 vp = nd.ni_vp; 2643 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2644 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2645 if (vp->v_type == VDIR) 2646 error = EISDIR; 2647 else if ((error = vn_writechk(vp)) == 0 && 2648 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2649 VATTR_NULL(&vattr); 2650 vattr.va_size = SCARG(uap, length); 2651 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2652 } 2653 vput(vp); 2654 return (error); 2655 } 2656 2657 /* 2658 * Truncate a file given a file descriptor. 2659 */ 2660 /* ARGSUSED */ 2661 int 2662 sys_ftruncate(p, v, retval) 2663 struct proc *p; 2664 void *v; 2665 register_t *retval; 2666 { 2667 struct sys_ftruncate_args /* { 2668 syscallarg(int) fd; 2669 syscallarg(int) pad; 2670 syscallarg(off_t) length; 2671 } */ *uap = v; 2672 struct vattr vattr; 2673 struct vnode *vp; 2674 struct file *fp; 2675 int error; 2676 2677 /* getvnode() will use the descriptor for us */ 2678 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2679 return (error); 2680 if ((fp->f_flag & FWRITE) == 0) { 2681 error = EINVAL; 2682 goto out; 2683 } 2684 vp = (struct vnode *)fp->f_data; 2685 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2686 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2687 if (vp->v_type == VDIR) 2688 error = EISDIR; 2689 else if ((error = vn_writechk(vp)) == 0) { 2690 VATTR_NULL(&vattr); 2691 vattr.va_size = SCARG(uap, length); 2692 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2693 } 2694 VOP_UNLOCK(vp, 0); 2695 out: 2696 FILE_UNUSE(fp, p); 2697 return (error); 2698 } 2699 2700 /* 2701 * Sync an open file. 2702 */ 2703 /* ARGSUSED */ 2704 int 2705 sys_fsync(p, v, retval) 2706 struct proc *p; 2707 void *v; 2708 register_t *retval; 2709 { 2710 struct sys_fsync_args /* { 2711 syscallarg(int) fd; 2712 } */ *uap = v; 2713 struct vnode *vp; 2714 struct file *fp; 2715 int error; 2716 2717 /* getvnode() will use the descriptor for us */ 2718 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2719 return (error); 2720 vp = (struct vnode *)fp->f_data; 2721 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2722 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2723 if (error == 0 && bioops.io_fsync != NULL && 2724 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2725 (*bioops.io_fsync)(vp); 2726 VOP_UNLOCK(vp, 0); 2727 FILE_UNUSE(fp, p); 2728 return (error); 2729 } 2730 2731 /* 2732 * Sync the data of an open file. 2733 */ 2734 /* ARGSUSED */ 2735 int 2736 sys_fdatasync(p, v, retval) 2737 struct proc *p; 2738 void *v; 2739 register_t *retval; 2740 { 2741 struct sys_fdatasync_args /* { 2742 syscallarg(int) fd; 2743 } */ *uap = v; 2744 struct vnode *vp; 2745 struct file *fp; 2746 int error; 2747 2748 /* getvnode() will use the descriptor for us */ 2749 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2750 return (error); 2751 vp = (struct vnode *)fp->f_data; 2752 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2753 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2754 VOP_UNLOCK(vp, 0); 2755 FILE_UNUSE(fp, p); 2756 return (error); 2757 } 2758 2759 /* 2760 * Rename files, (standard) BSD semantics frontend. 2761 */ 2762 /* ARGSUSED */ 2763 int 2764 sys_rename(p, v, retval) 2765 struct proc *p; 2766 void *v; 2767 register_t *retval; 2768 { 2769 struct sys_rename_args /* { 2770 syscallarg(const char *) from; 2771 syscallarg(const char *) to; 2772 } */ *uap = v; 2773 2774 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2775 } 2776 2777 /* 2778 * Rename files, POSIX semantics frontend. 2779 */ 2780 /* ARGSUSED */ 2781 int 2782 sys___posix_rename(p, v, retval) 2783 struct proc *p; 2784 void *v; 2785 register_t *retval; 2786 { 2787 struct sys___posix_rename_args /* { 2788 syscallarg(const char *) from; 2789 syscallarg(const char *) to; 2790 } */ *uap = v; 2791 2792 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2793 } 2794 2795 /* 2796 * Rename files. Source and destination must either both be directories, 2797 * or both not be directories. If target is a directory, it must be empty. 2798 * If `from' and `to' refer to the same object, the value of the `retain' 2799 * argument is used to determine whether `from' will be 2800 * 2801 * (retain == 0) deleted unless `from' and `to' refer to the same 2802 * object in the file system's name space (BSD). 2803 * (retain == 1) always retained (POSIX). 2804 */ 2805 static int 2806 rename_files(from, to, p, retain) 2807 const char *from, *to; 2808 struct proc *p; 2809 int retain; 2810 { 2811 struct vnode *tvp, *fvp, *tdvp; 2812 struct nameidata fromnd, tond; 2813 int error; 2814 2815 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2816 from, p); 2817 if ((error = namei(&fromnd)) != 0) 2818 return (error); 2819 fvp = fromnd.ni_vp; 2820 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2821 UIO_USERSPACE, to, p); 2822 if ((error = namei(&tond)) != 0) { 2823 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2824 vrele(fromnd.ni_dvp); 2825 vrele(fvp); 2826 goto out1; 2827 } 2828 tdvp = tond.ni_dvp; 2829 tvp = tond.ni_vp; 2830 2831 if (tvp != NULL) { 2832 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2833 error = ENOTDIR; 2834 goto out; 2835 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2836 error = EISDIR; 2837 goto out; 2838 } 2839 } 2840 2841 if (fvp == tdvp) 2842 error = EINVAL; 2843 2844 /* 2845 * Source and destination refer to the same object. 2846 */ 2847 if (fvp == tvp) { 2848 if (retain) 2849 error = -1; 2850 else if (fromnd.ni_dvp == tdvp && 2851 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2852 !memcmp(fromnd.ni_cnd.cn_nameptr, 2853 tond.ni_cnd.cn_nameptr, 2854 fromnd.ni_cnd.cn_namelen)) 2855 error = -1; 2856 } 2857 2858 out: 2859 if (!error) { 2860 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2861 if (fromnd.ni_dvp != tdvp) 2862 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2863 if (tvp) { 2864 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2865 } 2866 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2867 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2868 } else { 2869 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2870 if (tdvp == tvp) 2871 vrele(tdvp); 2872 else 2873 vput(tdvp); 2874 if (tvp) 2875 vput(tvp); 2876 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2877 vrele(fromnd.ni_dvp); 2878 vrele(fvp); 2879 } 2880 vrele(tond.ni_startdir); 2881 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 2882 out1: 2883 if (fromnd.ni_startdir) 2884 vrele(fromnd.ni_startdir); 2885 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 2886 return (error == -1 ? 0 : error); 2887 } 2888 2889 /* 2890 * Make a directory file. 2891 */ 2892 /* ARGSUSED */ 2893 int 2894 sys_mkdir(p, v, retval) 2895 struct proc *p; 2896 void *v; 2897 register_t *retval; 2898 { 2899 struct sys_mkdir_args /* { 2900 syscallarg(const char *) path; 2901 syscallarg(int) mode; 2902 } */ *uap = v; 2903 struct vnode *vp; 2904 struct vattr vattr; 2905 int error; 2906 struct nameidata nd; 2907 2908 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2909 if ((error = namei(&nd)) != 0) 2910 return (error); 2911 vp = nd.ni_vp; 2912 if (vp != NULL) { 2913 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2914 if (nd.ni_dvp == vp) 2915 vrele(nd.ni_dvp); 2916 else 2917 vput(nd.ni_dvp); 2918 vrele(vp); 2919 return (EEXIST); 2920 } 2921 VATTR_NULL(&vattr); 2922 vattr.va_type = VDIR; 2923 vattr.va_mode = 2924 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2925 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2926 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2927 if (!error) 2928 vput(nd.ni_vp); 2929 return (error); 2930 } 2931 2932 /* 2933 * Remove a directory file. 2934 */ 2935 /* ARGSUSED */ 2936 int 2937 sys_rmdir(p, v, retval) 2938 struct proc *p; 2939 void *v; 2940 register_t *retval; 2941 { 2942 struct sys_rmdir_args /* { 2943 syscallarg(const char *) path; 2944 } */ *uap = v; 2945 struct vnode *vp; 2946 int error; 2947 struct nameidata nd; 2948 2949 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2950 SCARG(uap, path), p); 2951 if ((error = namei(&nd)) != 0) 2952 return (error); 2953 vp = nd.ni_vp; 2954 if (vp->v_type != VDIR) { 2955 error = ENOTDIR; 2956 goto out; 2957 } 2958 /* 2959 * No rmdir "." please. 2960 */ 2961 if (nd.ni_dvp == vp) { 2962 error = EINVAL; 2963 goto out; 2964 } 2965 /* 2966 * The root of a mounted filesystem cannot be deleted. 2967 */ 2968 if (vp->v_flag & VROOT) 2969 error = EBUSY; 2970 out: 2971 if (!error) { 2972 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2973 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2974 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2975 } else { 2976 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2977 if (nd.ni_dvp == vp) 2978 vrele(nd.ni_dvp); 2979 else 2980 vput(nd.ni_dvp); 2981 vput(vp); 2982 } 2983 return (error); 2984 } 2985 2986 /* 2987 * Read a block of directory entries in a file system independent format. 2988 */ 2989 int 2990 sys_getdents(p, v, retval) 2991 struct proc *p; 2992 void *v; 2993 register_t *retval; 2994 { 2995 struct sys_getdents_args /* { 2996 syscallarg(int) fd; 2997 syscallarg(char *) buf; 2998 syscallarg(size_t) count; 2999 } */ *uap = v; 3000 struct file *fp; 3001 int error, done; 3002 3003 /* getvnode() will use the descriptor for us */ 3004 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3005 return (error); 3006 if ((fp->f_flag & FREAD) == 0) { 3007 error = EBADF; 3008 goto out; 3009 } 3010 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3011 SCARG(uap, count), &done, p, 0, 0); 3012 *retval = done; 3013 out: 3014 FILE_UNUSE(fp, p); 3015 return (error); 3016 } 3017 3018 /* 3019 * Set the mode mask for creation of filesystem nodes. 3020 */ 3021 int 3022 sys_umask(p, v, retval) 3023 struct proc *p; 3024 void *v; 3025 register_t *retval; 3026 { 3027 struct sys_umask_args /* { 3028 syscallarg(mode_t) newmask; 3029 } */ *uap = v; 3030 struct cwdinfo *cwdi; 3031 3032 cwdi = p->p_cwdi; 3033 *retval = cwdi->cwdi_cmask; 3034 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3035 return (0); 3036 } 3037 3038 /* 3039 * Void all references to file by ripping underlying filesystem 3040 * away from vnode. 3041 */ 3042 /* ARGSUSED */ 3043 int 3044 sys_revoke(p, v, retval) 3045 struct proc *p; 3046 void *v; 3047 register_t *retval; 3048 { 3049 struct sys_revoke_args /* { 3050 syscallarg(const char *) path; 3051 } */ *uap = v; 3052 struct vnode *vp; 3053 struct vattr vattr; 3054 int error; 3055 struct nameidata nd; 3056 3057 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3058 if ((error = namei(&nd)) != 0) 3059 return (error); 3060 vp = nd.ni_vp; 3061 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3062 goto out; 3063 if (p->p_ucred->cr_uid != vattr.va_uid && 3064 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3065 goto out; 3066 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3067 VOP_REVOKE(vp, REVOKEALL); 3068 out: 3069 vrele(vp); 3070 return (error); 3071 } 3072 3073 /* 3074 * Convert a user file descriptor to a kernel file entry. 3075 */ 3076 int 3077 getvnode(fdp, fd, fpp) 3078 struct filedesc *fdp; 3079 int fd; 3080 struct file **fpp; 3081 { 3082 struct vnode *vp; 3083 struct file *fp; 3084 3085 if ((fp = fd_getfile(fdp, fd)) == NULL) 3086 return (EBADF); 3087 3088 FILE_USE(fp); 3089 3090 if (fp->f_type != DTYPE_VNODE) { 3091 FILE_UNUSE(fp, NULL); 3092 return (EINVAL); 3093 } 3094 3095 vp = (struct vnode *)fp->f_data; 3096 if (vp->v_type == VBAD) { 3097 FILE_UNUSE(fp, NULL); 3098 return (EBADF); 3099 } 3100 3101 *fpp = fp; 3102 return (0); 3103 } 3104
Indexes created Sat Sep 27 22:09:54 GMT 2025