vfs_syscalls.c revision 1.147.4.2
1 /* $NetBSD: vfs_syscalls.c,v 1.147.4.2 1999/10/21 19:21:30 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 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <miscfs/genfs/genfs.h> 66 #include <miscfs/syncfs/syncfs.h> 67 68 #include <uvm/uvm_extern.h> 69 70 static int change_dir __P((struct nameidata *, struct proc *)); 71 static int change_mode __P((struct vnode *, int, struct proc *p)); 72 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 73 int)); 74 static int change_utimes __P((struct vnode *vp, const struct timeval *, 75 struct proc *p)); 76 static int rename_files __P((const char *, const char *, struct proc *, int)); 77 78 void checkdirs __P((struct vnode *)); 79 int dounmount __P((struct mount *, int, struct proc *)); 80 81 /* 82 * Virtual File System System Calls 83 */ 84 85 /* 86 * Mount a file system. 87 */ 88 89 /* 90 * This table is used to maintain compatibility with 4.3BSD 91 * and NetBSD 0.9 mount syscalls. Note, the order is important! 92 * 93 * Also note that not all of these had actual numbers in 4.3BSD 94 * or NetBSD 0.9! 95 */ 96 const char *mountcompatnames[] = { 97 NULL, /* 0 = MOUNT_NONE */ 98 MOUNT_FFS, /* 1 */ 99 MOUNT_NFS, /* 2 */ 100 MOUNT_MFS, /* 3 */ 101 MOUNT_MSDOS, /* 4 */ 102 MOUNT_LFS, /* 5 */ 103 NULL, /* 6 = MOUNT_LOFS */ 104 MOUNT_FDESC, /* 7 */ 105 MOUNT_PORTAL, /* 8 */ 106 MOUNT_NULL, /* 9 */ 107 MOUNT_UMAP, /* 10 */ 108 MOUNT_KERNFS, /* 11 */ 109 MOUNT_PROCFS, /* 12 */ 110 MOUNT_AFS, /* 13 */ 111 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 112 MOUNT_UNION, /* 15 */ 113 MOUNT_ADOSFS, /* 16 */ 114 MOUNT_EXT2FS, /* 17 */ 115 MOUNT_CODA, /* 18 */ 116 MOUNT_FILECORE, /* 19 */ 117 MOUNT_NTFS, /* 20 */ 118 }; 119 const int nmountcompatnames = sizeof(mountcompatnames) / 120 sizeof(mountcompatnames[0]); 121 122 /* ARGSUSED */ 123 int 124 sys_mount(p, v, retval) 125 struct proc *p; 126 void *v; 127 register_t *retval; 128 { 129 register struct sys_mount_args /* { 130 syscallarg(const char *) type; 131 syscallarg(const char *) path; 132 syscallarg(int) flags; 133 syscallarg(void *) data; 134 } */ *uap = v; 135 struct vnode *vp; 136 struct mount *mp; 137 int error, flag = 0; 138 char fstypename[MFSNAMELEN]; 139 struct vattr va; 140 struct nameidata nd; 141 struct vfsops *vfs; 142 143 /* 144 * Get vnode to be covered 145 */ 146 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 147 SCARG(uap, path), p); 148 if ((error = namei(&nd)) != 0) 149 return (error); 150 vp = nd.ni_vp; 151 /* 152 * A lookup in VFS_MOUNT might result in an attempt to 153 * lock this vnode again, so make the lock resursive. 154 */ 155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 156 if (SCARG(uap, flags) & MNT_UPDATE) { 157 if ((vp->v_flag & VROOT) == 0) { 158 vput(vp); 159 return (EINVAL); 160 } 161 mp = vp->v_mount; 162 flag = mp->mnt_flag; 163 vfs = mp->mnt_op; 164 /* 165 * We only allow the filesystem to be reloaded if it 166 * is currently mounted read-only. 167 */ 168 if ((SCARG(uap, flags) & MNT_RELOAD) && 169 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 170 vput(vp); 171 return (EOPNOTSUPP); /* Needs translation */ 172 } 173 /* 174 * In "highly secure" mode, don't let the caller do anything 175 * but downgrade a filesystem from read-write to read-only. 176 * (see also below; MNT_UPDATE is required.) 177 */ 178 if (securelevel >= 2 && 179 (SCARG(uap, flags) != 180 (mp->mnt_flag | MNT_RDONLY | 181 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 182 vput(vp); 183 return (EPERM); 184 } 185 mp->mnt_flag |= 186 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 187 /* 188 * Only root, or the user that did the original mount is 189 * permitted to update it. 190 */ 191 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 192 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 193 vput(vp); 194 return (error); 195 } 196 /* 197 * Do not allow NFS export by non-root users. For non-root 198 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 199 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 200 */ 201 if (p->p_ucred->cr_uid != 0) { 202 if (SCARG(uap, flags) & MNT_EXPORTED) { 203 vput(vp); 204 return (EPERM); 205 } 206 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 207 if (flag & MNT_NOEXEC) 208 SCARG(uap, flags) |= MNT_NOEXEC; 209 } 210 if (vfs_busy(mp, LK_NOWAIT, 0)) { 211 vput(vp); 212 return (EPERM); 213 } 214 VOP_UNLOCK(vp, 0); 215 goto update; 216 } else { 217 if (securelevel >= 2) 218 return (EPERM); 219 } 220 /* 221 * If the user is not root, ensure that they own the directory 222 * onto which we are attempting to mount. 223 */ 224 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 225 (va.va_uid != p->p_ucred->cr_uid && 226 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 227 vput(vp); 228 return (error); 229 } 230 /* 231 * Do not allow NFS export by non-root users. For non-root users, 232 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 233 * mount point is already MNT_NOEXEC. 234 */ 235 if (p->p_ucred->cr_uid != 0) { 236 if (SCARG(uap, flags) & MNT_EXPORTED) { 237 vput(vp); 238 return (EPERM); 239 } 240 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 241 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 242 SCARG(uap, flags) |= MNT_NOEXEC; 243 } 244 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 245 return (error); 246 if (vp->v_type != VDIR) { 247 vput(vp); 248 return (ENOTDIR); 249 } 250 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 251 if (error) { 252 #if defined(COMPAT_09) || defined(COMPAT_43) 253 /* 254 * Historically filesystem types were identified by number. 255 * If we get an integer for the filesystem type instead of a 256 * string, we check to see if it matches one of the historic 257 * filesystem types. 258 */ 259 u_long fsindex = (u_long)SCARG(uap, type); 260 if (fsindex >= nmountcompatnames || 261 mountcompatnames[fsindex] == NULL) { 262 vput(vp); 263 return (ENODEV); 264 } 265 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 266 #else 267 vput(vp); 268 return (error); 269 #endif 270 } 271 #ifdef COMPAT_10 272 /* Accept `ufs' as an alias for `ffs'. */ 273 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 274 strncpy(fstypename, "ffs", MFSNAMELEN); 275 #endif 276 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 277 vput(vp); 278 return (ENODEV); 279 } 280 if (vp->v_mountedhere != NULL) { 281 vput(vp); 282 return (EBUSY); 283 } 284 285 /* 286 * Allocate and initialize the file system. 287 */ 288 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 289 M_MOUNT, M_WAITOK); 290 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 291 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 292 (void)vfs_busy(mp, LK_NOWAIT, 0); 293 mp->mnt_op = vfs; 294 vfs->vfs_refcount++; 295 mp->mnt_vnodecovered = vp; 296 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 297 mp->mnt_unmounter = NULL; 298 update: 299 /* 300 * Set the mount level flags. 301 */ 302 if (SCARG(uap, flags) & MNT_RDONLY) 303 mp->mnt_flag |= MNT_RDONLY; 304 else if (mp->mnt_flag & MNT_RDONLY) 305 mp->mnt_flag |= MNT_WANTRDWR; 306 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 307 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 308 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 309 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 310 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 311 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 312 /* 313 * Mount the filesystem. 314 */ 315 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 316 if (mp->mnt_flag & MNT_UPDATE) { 317 vrele(vp); 318 if (mp->mnt_flag & MNT_WANTRDWR) 319 mp->mnt_flag &= ~MNT_RDONLY; 320 mp->mnt_flag &=~ 321 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 322 if (error) 323 mp->mnt_flag = flag; 324 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 325 if (mp->mnt_syncer == NULL) 326 error = vfs_allocate_syncvnode(mp); 327 } else { 328 if (mp->mnt_syncer != NULL) 329 vgone(mp->mnt_syncer); 330 mp->mnt_syncer = NULL; 331 } 332 vfs_unbusy(mp); 333 return (error); 334 } 335 /* 336 * Put the new filesystem on the mount list after root. 337 */ 338 cache_purge(vp); 339 if (!error) { 340 vp->v_mountedhere = mp; 341 simple_lock(&mountlist_slock); 342 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 343 simple_unlock(&mountlist_slock); 344 checkdirs(vp); 345 VOP_UNLOCK(vp, 0); 346 if ((mp->mnt_flag & MNT_RDONLY) == 0) 347 error = vfs_allocate_syncvnode(mp); 348 vfs_unbusy(mp); 349 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 350 if ((error = VFS_START(mp, 0, p))) 351 vrele(vp); 352 } else { 353 vp->v_mountedhere = (struct mount *)0; 354 vfs->vfs_refcount--; 355 vfs_unbusy(mp); 356 free((caddr_t)mp, M_MOUNT); 357 vput(vp); 358 } 359 return (error); 360 } 361 362 /* 363 * Scan all active processes to see if any of them have a current 364 * or root directory onto which the new filesystem has just been 365 * mounted. If so, replace them with the new mount point. 366 */ 367 void 368 checkdirs(olddp) 369 struct vnode *olddp; 370 { 371 struct cwdinfo *cwdi; 372 struct vnode *newdp; 373 struct proc *p; 374 375 if (olddp->v_usecount == 1) 376 return; 377 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 378 panic("mount: lost mount"); 379 proclist_lock_read(); 380 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 381 cwdi = p->p_cwdi; 382 if (cwdi->cwdi_cdir == olddp) { 383 vrele(cwdi->cwdi_cdir); 384 VREF(newdp); 385 cwdi->cwdi_cdir = newdp; 386 } 387 if (cwdi->cwdi_rdir == olddp) { 388 vrele(cwdi->cwdi_rdir); 389 VREF(newdp); 390 cwdi->cwdi_rdir = newdp; 391 } 392 } 393 proclist_unlock_read(); 394 if (rootvnode == olddp) { 395 vrele(rootvnode); 396 VREF(newdp); 397 rootvnode = newdp; 398 } 399 vput(newdp); 400 } 401 402 /* 403 * Unmount a file system. 404 * 405 * Note: unmount takes a path to the vnode mounted on as argument, 406 * not special file (as before). 407 */ 408 /* ARGSUSED */ 409 int 410 sys_unmount(p, v, retval) 411 struct proc *p; 412 void *v; 413 register_t *retval; 414 { 415 register struct sys_unmount_args /* { 416 syscallarg(const char *) path; 417 syscallarg(int) flags; 418 } */ *uap = v; 419 register struct vnode *vp; 420 struct mount *mp; 421 int error; 422 struct nameidata nd; 423 424 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 425 SCARG(uap, path), p); 426 if ((error = namei(&nd)) != 0) 427 return (error); 428 vp = nd.ni_vp; 429 mp = vp->v_mount; 430 431 /* 432 * Only root, or the user that did the original mount is 433 * permitted to unmount this filesystem. 434 */ 435 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 436 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 437 vput(vp); 438 return (error); 439 } 440 441 /* 442 * Don't allow unmounting the root file system. 443 */ 444 if (mp->mnt_flag & MNT_ROOTFS) { 445 vput(vp); 446 return (EINVAL); 447 } 448 449 /* 450 * Must be the root of the filesystem 451 */ 452 if ((vp->v_flag & VROOT) == 0) { 453 vput(vp); 454 return (EINVAL); 455 } 456 vput(vp); 457 458 if (vfs_busy(mp, 0, 0)) 459 return (EBUSY); 460 461 return (dounmount(mp, SCARG(uap, flags), p)); 462 } 463 464 /* 465 * Do the actual file system unmount. File system is assumed to have been 466 * marked busy by the caller. 467 */ 468 int 469 dounmount(mp, flags, p) 470 register struct mount *mp; 471 int flags; 472 struct proc *p; 473 { 474 struct vnode *coveredvp; 475 int error; 476 int async; 477 478 simple_lock(&mountlist_slock); 479 mp->mnt_flag |= MNT_UNMOUNT; 480 mp->mnt_unmounter = p; 481 vfs_unbusy(mp); 482 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 483 if (mp->mnt_flag & MNT_EXPUBLIC) 484 vfs_setpublicfs(NULL, NULL, NULL); 485 async = mp->mnt_flag & MNT_ASYNC; 486 mp->mnt_flag &=~ MNT_ASYNC; 487 cache_purgevfs(mp); /* remove cache entries for this file sys */ 488 if (mp->mnt_syncer != NULL) 489 vgone(mp->mnt_syncer); 490 if (((mp->mnt_flag & MNT_RDONLY) || 491 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 492 (flags & MNT_FORCE)) 493 error = VFS_UNMOUNT(mp, flags, p); 494 simple_lock(&mountlist_slock); 495 if (error) { 496 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 497 (void) vfs_allocate_syncvnode(mp); 498 mp->mnt_flag &= ~MNT_UNMOUNT; 499 mp->mnt_unmounter = NULL; 500 mp->mnt_flag |= async; 501 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 502 &mountlist_slock); 503 while(mp->mnt_wcnt > 0) { 504 wakeup((caddr_t)mp); 505 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 506 } 507 return (error); 508 } 509 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 510 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 511 coveredvp->v_mountedhere = NULL; 512 vrele(coveredvp); 513 } 514 mp->mnt_op->vfs_refcount--; 515 if (mp->mnt_vnodelist.lh_first != NULL) 516 panic("unmount: dangling vnode"); 517 mp->mnt_flag |= MNT_GONE; 518 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 519 while(mp->mnt_wcnt > 0) { 520 wakeup((caddr_t)mp); 521 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 522 } 523 free((caddr_t)mp, M_MOUNT); 524 return (0); 525 } 526 527 /* 528 * Sync each mounted filesystem. 529 */ 530 #ifdef DEBUG 531 int syncprt = 0; 532 struct ctldebug debug0 = { "syncprt", &syncprt }; 533 #endif 534 535 /* ARGSUSED */ 536 int 537 sys_sync(p, v, retval) 538 struct proc *p; 539 void *v; 540 register_t *retval; 541 { 542 register struct mount *mp, *nmp; 543 int asyncflag; 544 545 simple_lock(&mountlist_slock); 546 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 547 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 548 nmp = mp->mnt_list.cqe_prev; 549 continue; 550 } 551 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 552 asyncflag = mp->mnt_flag & MNT_ASYNC; 553 mp->mnt_flag &= ~MNT_ASYNC; 554 uvm_vnp_sync(mp); 555 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 556 if (asyncflag) 557 mp->mnt_flag |= MNT_ASYNC; 558 } 559 simple_lock(&mountlist_slock); 560 nmp = mp->mnt_list.cqe_prev; 561 vfs_unbusy(mp); 562 563 } 564 simple_unlock(&mountlist_slock); 565 #ifdef DEBUG 566 if (syncprt) 567 vfs_bufstats(); 568 #endif /* DEBUG */ 569 return (0); 570 } 571 572 /* 573 * Change filesystem quotas. 574 */ 575 /* ARGSUSED */ 576 int 577 sys_quotactl(p, v, retval) 578 struct proc *p; 579 void *v; 580 register_t *retval; 581 { 582 register struct sys_quotactl_args /* { 583 syscallarg(const char *) path; 584 syscallarg(int) cmd; 585 syscallarg(int) uid; 586 syscallarg(caddr_t) arg; 587 } */ *uap = v; 588 register struct mount *mp; 589 int error; 590 struct nameidata nd; 591 592 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 593 if ((error = namei(&nd)) != 0) 594 return (error); 595 mp = nd.ni_vp->v_mount; 596 vrele(nd.ni_vp); 597 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 598 SCARG(uap, arg), p)); 599 } 600 601 /* 602 * Get filesystem statistics. 603 */ 604 /* ARGSUSED */ 605 int 606 sys_statfs(p, v, retval) 607 struct proc *p; 608 void *v; 609 register_t *retval; 610 { 611 register struct sys_statfs_args /* { 612 syscallarg(const char *) path; 613 syscallarg(struct statfs *) buf; 614 } */ *uap = v; 615 register struct mount *mp; 616 register struct statfs *sp; 617 int error; 618 struct nameidata nd; 619 620 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 621 if ((error = namei(&nd)) != 0) 622 return (error); 623 mp = nd.ni_vp->v_mount; 624 sp = &mp->mnt_stat; 625 vrele(nd.ni_vp); 626 if ((error = VFS_STATFS(mp, sp, p)) != 0) 627 return (error); 628 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 629 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 630 } 631 632 /* 633 * Get filesystem statistics. 634 */ 635 /* ARGSUSED */ 636 int 637 sys_fstatfs(p, v, retval) 638 struct proc *p; 639 void *v; 640 register_t *retval; 641 { 642 register struct sys_fstatfs_args /* { 643 syscallarg(int) fd; 644 syscallarg(struct statfs *) buf; 645 } */ *uap = v; 646 struct file *fp; 647 struct mount *mp; 648 register struct statfs *sp; 649 int error; 650 651 /* getvnode() will use the descriptor for us */ 652 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 653 return (error); 654 mp = ((struct vnode *)fp->f_data)->v_mount; 655 sp = &mp->mnt_stat; 656 if ((error = VFS_STATFS(mp, sp, p)) != 0) 657 goto out; 658 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 659 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 660 out: 661 FILE_UNUSE(fp, p); 662 return (error); 663 } 664 665 /* 666 * Get statistics on all filesystems. 667 */ 668 int 669 sys_getfsstat(p, v, retval) 670 struct proc *p; 671 void *v; 672 register_t *retval; 673 { 674 register struct sys_getfsstat_args /* { 675 syscallarg(struct statfs *) buf; 676 syscallarg(long) bufsize; 677 syscallarg(int) flags; 678 } */ *uap = v; 679 register struct mount *mp, *nmp; 680 register struct statfs *sp; 681 caddr_t sfsp; 682 long count, maxcount, error; 683 684 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 685 sfsp = (caddr_t)SCARG(uap, buf); 686 simple_lock(&mountlist_slock); 687 count = 0; 688 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 689 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 690 nmp = mp->mnt_list.cqe_next; 691 continue; 692 } 693 if (sfsp && count < maxcount) { 694 sp = &mp->mnt_stat; 695 /* 696 * If MNT_NOWAIT or MNT_LAZY is specified, do not 697 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 698 * overrides MNT_NOWAIT. 699 */ 700 if (SCARG(uap, flags) != MNT_NOWAIT && 701 SCARG(uap, flags) != MNT_LAZY && 702 (SCARG(uap, flags) == MNT_WAIT || 703 SCARG(uap, flags) == 0) && 704 (error = VFS_STATFS(mp, sp, p)) != 0) { 705 simple_lock(&mountlist_slock); 706 nmp = mp->mnt_list.cqe_next; 707 vfs_unbusy(mp); 708 continue; 709 } 710 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 711 error = copyout(sp, sfsp, sizeof(*sp)); 712 if (error) { 713 vfs_unbusy(mp); 714 return (error); 715 } 716 sfsp += sizeof(*sp); 717 } 718 count++; 719 simple_lock(&mountlist_slock); 720 nmp = mp->mnt_list.cqe_next; 721 vfs_unbusy(mp); 722 } 723 simple_unlock(&mountlist_slock); 724 if (sfsp && count > maxcount) 725 *retval = maxcount; 726 else 727 *retval = count; 728 return (0); 729 } 730 731 /* 732 * Change current working directory to a given file descriptor. 733 */ 734 /* ARGSUSED */ 735 int 736 sys_fchdir(p, v, retval) 737 struct proc *p; 738 void *v; 739 register_t *retval; 740 { 741 struct sys_fchdir_args /* { 742 syscallarg(int) fd; 743 } */ *uap = v; 744 struct filedesc *fdp = p->p_fd; 745 struct cwdinfo *cwdi = p->p_cwdi; 746 struct vnode *vp, *tdp; 747 struct mount *mp; 748 struct file *fp; 749 int error; 750 751 /* getvnode() will use the descriptor for us */ 752 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 753 return (error); 754 vp = (struct vnode *)fp->f_data; 755 756 VREF(vp); 757 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 758 if (vp->v_type != VDIR) 759 error = ENOTDIR; 760 else 761 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 762 while (!error && (mp = vp->v_mountedhere) != NULL) { 763 if (vfs_busy(mp, 0, 0)) 764 continue; 765 error = VFS_ROOT(mp, &tdp); 766 vfs_unbusy(mp); 767 if (error) 768 break; 769 vput(vp); 770 vp = tdp; 771 } 772 if (error) { 773 vput(vp); 774 goto out; 775 } 776 VOP_UNLOCK(vp, 0); 777 778 /* 779 * Disallow changing to a directory not under the process's 780 * current root directory (if there is one). 781 */ 782 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 783 vrele(vp); 784 error = EPERM; /* operation not permitted */ 785 goto out; 786 } 787 788 vrele(cwdi->cwdi_cdir); 789 cwdi->cwdi_cdir = vp; 790 out: 791 FILE_UNUSE(fp, p); 792 return (error); 793 } 794 795 /* 796 * Change this process's notion of the root directory to a given file descriptor. 797 */ 798 799 int 800 sys_fchroot(p, v, retval) 801 struct proc *p; 802 void *v; 803 register_t *retval; 804 { 805 struct sys_fchroot_args *uap = v; 806 struct filedesc *fdp = p->p_fd; 807 struct cwdinfo *cwdi = p->p_cwdi; 808 struct vnode *vp; 809 struct file *fp; 810 int error; 811 812 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 813 return error; 814 /* getvnode() will use the descriptor for us */ 815 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 816 return error; 817 vp = (struct vnode *) fp->f_data; 818 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 819 if (vp->v_type != VDIR) 820 error = ENOTDIR; 821 else 822 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 823 VOP_UNLOCK(vp, 0); 824 if (error) 825 goto out; 826 VREF(vp); 827 828 /* 829 * Prevent escaping from chroot by putting the root under 830 * the working directory. Silently chdir to / if we aren't 831 * already there. 832 */ 833 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 834 /* 835 * XXX would be more failsafe to change directory to a 836 * deadfs node here instead 837 */ 838 vrele(cwdi->cwdi_cdir); 839 VREF(vp); 840 cwdi->cwdi_cdir = vp; 841 } 842 843 if (cwdi->cwdi_rdir != NULL) 844 vrele(cwdi->cwdi_rdir); 845 cwdi->cwdi_rdir = vp; 846 out: 847 FILE_UNUSE(fp, p); 848 return (error); 849 } 850 851 852 853 /* 854 * Change current working directory (``.''). 855 */ 856 /* ARGSUSED */ 857 int 858 sys_chdir(p, v, retval) 859 struct proc *p; 860 void *v; 861 register_t *retval; 862 { 863 struct sys_chdir_args /* { 864 syscallarg(const char *) path; 865 } */ *uap = v; 866 struct cwdinfo *cwdi = p->p_cwdi; 867 int error; 868 struct nameidata nd; 869 870 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 871 SCARG(uap, path), p); 872 if ((error = change_dir(&nd, p)) != 0) 873 return (error); 874 vrele(cwdi->cwdi_cdir); 875 cwdi->cwdi_cdir = nd.ni_vp; 876 return (0); 877 } 878 879 /* 880 * Change notion of root (``/'') directory. 881 */ 882 /* ARGSUSED */ 883 int 884 sys_chroot(p, v, retval) 885 struct proc *p; 886 void *v; 887 register_t *retval; 888 { 889 struct sys_chroot_args /* { 890 syscallarg(const char *) path; 891 } */ *uap = v; 892 struct cwdinfo *cwdi = p->p_cwdi; 893 struct vnode *vp; 894 int error; 895 struct nameidata nd; 896 897 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 898 return (error); 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 if (cwdi->cwdi_rdir != NULL) 904 vrele(cwdi->cwdi_rdir); 905 vp = nd.ni_vp; 906 cwdi->cwdi_rdir = vp; 907 908 /* 909 * Prevent escaping from chroot by putting the root under 910 * the working directory. Silently chdir to / if we aren't 911 * already there. 912 */ 913 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 914 /* 915 * XXX would be more failsafe to change directory to a 916 * deadfs node here instead 917 */ 918 vrele(cwdi->cwdi_cdir); 919 VREF(vp); 920 cwdi->cwdi_cdir = vp; 921 } 922 923 return (0); 924 } 925 926 /* 927 * Common routine for chroot and chdir. 928 */ 929 static int 930 change_dir(ndp, p) 931 register struct nameidata *ndp; 932 struct proc *p; 933 { 934 struct vnode *vp; 935 int error; 936 937 if ((error = namei(ndp)) != 0) 938 return (error); 939 vp = ndp->ni_vp; 940 if (vp->v_type != VDIR) 941 error = ENOTDIR; 942 else 943 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 944 945 if (error) 946 vput(vp); 947 else 948 VOP_UNLOCK(vp, 0); 949 return (error); 950 } 951 952 /* 953 * Check permissions, allocate an open file structure, 954 * and call the device open routine if any. 955 */ 956 int 957 sys_open(p, v, retval) 958 struct proc *p; 959 void *v; 960 register_t *retval; 961 { 962 register struct sys_open_args /* { 963 syscallarg(const char *) path; 964 syscallarg(int) flags; 965 syscallarg(int) mode; 966 } */ *uap = v; 967 struct cwdinfo *cwdi = p->p_cwdi; 968 struct filedesc *fdp = p->p_fd; 969 struct file *fp; 970 struct vnode *vp; 971 int flags, cmode; 972 int type, indx, error; 973 struct flock lf; 974 struct nameidata nd; 975 extern struct fileops vnops; 976 977 flags = FFLAGS(SCARG(uap, flags)); 978 if ((flags & (FREAD | FWRITE)) == 0) 979 return (EINVAL); 980 /* falloc() will use the file descriptor for us */ 981 if ((error = falloc(p, &fp, &indx)) != 0) 982 return (error); 983 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 984 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 985 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 986 if ((error = vn_open(&nd, flags, cmode)) != 0) { 987 FILE_UNUSE(fp, p); 988 ffree(fp); 989 if ((error == ENODEV || error == ENXIO) && 990 p->p_dupfd >= 0 && /* XXX from fdopen */ 991 (error = 992 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 993 *retval = indx; 994 return (0); 995 } 996 if (error == ERESTART) 997 error = EINTR; 998 fdp->fd_ofiles[indx] = NULL; 999 return (error); 1000 } 1001 p->p_dupfd = 0; 1002 vp = nd.ni_vp; 1003 fp->f_flag = flags & FMASK; 1004 fp->f_type = DTYPE_VNODE; 1005 fp->f_ops = &vnops; 1006 fp->f_data = (caddr_t)vp; 1007 if (flags & (O_EXLOCK | O_SHLOCK)) { 1008 lf.l_whence = SEEK_SET; 1009 lf.l_start = 0; 1010 lf.l_len = 0; 1011 if (flags & O_EXLOCK) 1012 lf.l_type = F_WRLCK; 1013 else 1014 lf.l_type = F_RDLCK; 1015 type = F_FLOCK; 1016 if ((flags & FNONBLOCK) == 0) 1017 type |= F_WAIT; 1018 VOP_UNLOCK(vp, 0); 1019 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1020 if (error) { 1021 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1022 FILE_UNUSE(fp, p); 1023 ffree(fp); 1024 fdp->fd_ofiles[indx] = NULL; 1025 return (error); 1026 } 1027 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1028 fp->f_flag |= FHASLOCK; 1029 } 1030 VOP_UNLOCK(vp, 0); 1031 *retval = indx; 1032 FILE_UNUSE(fp, p); 1033 return (0); 1034 } 1035 1036 /* 1037 * Get file handle system call 1038 */ 1039 int 1040 sys_getfh(p, v, retval) 1041 struct proc *p; 1042 register void *v; 1043 register_t *retval; 1044 { 1045 register struct sys_getfh_args /* { 1046 syscallarg(char *) fname; 1047 syscallarg(fhandle_t *) fhp; 1048 } */ *uap = v; 1049 register struct vnode *vp; 1050 fhandle_t fh; 1051 int error; 1052 struct nameidata nd; 1053 1054 /* 1055 * Must be super user 1056 */ 1057 error = suser(p->p_ucred, &p->p_acflag); 1058 if (error) 1059 return (error); 1060 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1061 SCARG(uap, fname), p); 1062 error = namei(&nd); 1063 if (error) 1064 return (error); 1065 vp = nd.ni_vp; 1066 memset((caddr_t)&fh, 0, sizeof(fh)); 1067 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1068 error = VFS_VPTOFH(vp, &fh.fh_fid); 1069 vput(vp); 1070 if (error) 1071 return (error); 1072 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1073 return (error); 1074 } 1075 1076 /* 1077 * Open a file given a file handle. 1078 * 1079 * Check permissions, allocate an open file structure, 1080 * and call the device open routine if any. 1081 */ 1082 int 1083 sys_fhopen(p, v, retval) 1084 struct proc *p; 1085 void *v; 1086 register_t *retval; 1087 { 1088 register struct sys_fhopen_args /* { 1089 syscallarg(const fhandle_t *) fhp; 1090 syscallarg(int) flags; 1091 } */ *uap = v; 1092 struct filedesc *fdp = p->p_fd; 1093 struct file *fp; 1094 struct vnode *vp = NULL; 1095 struct mount *mp; 1096 struct ucred *cred = p->p_ucred; 1097 int flags; 1098 struct file *nfp; 1099 int type, indx, error=0; 1100 struct flock lf; 1101 struct vattr va; 1102 fhandle_t fh; 1103 extern struct fileops vnops; 1104 1105 /* 1106 * Must be super user 1107 */ 1108 if ((error = suser(p->p_ucred, &p->p_acflag))) 1109 return (error); 1110 1111 flags = FFLAGS(SCARG(uap, flags)); 1112 if ((flags & (FREAD | FWRITE)) == 0) 1113 return (EINVAL); 1114 if ((flags & O_CREAT)) 1115 return (EINVAL); 1116 /* falloc() will use the file descriptor for us */ 1117 if ((error = falloc(p, &nfp, &indx)) != 0) 1118 return (error); 1119 fp = nfp; 1120 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1121 goto bad; 1122 1123 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1124 error = ESTALE; 1125 goto bad; 1126 } 1127 1128 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1129 vp = NULL; /* most likely unnecessary sanity for bad: */ 1130 goto bad; 1131 } 1132 1133 /* Now do an effective vn_open */ 1134 1135 if (vp->v_type == VSOCK) { 1136 error = EOPNOTSUPP; 1137 goto bad; 1138 } 1139 if (flags & FREAD) { 1140 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1141 goto bad; 1142 } 1143 if (flags & (FWRITE | O_TRUNC)) { 1144 if (vp->v_type == VDIR) { 1145 error = EISDIR; 1146 goto bad; 1147 } 1148 if ((error = vn_writechk(vp)) != 0 || 1149 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1150 goto bad; 1151 } 1152 if (flags & O_TRUNC) { 1153 VOP_UNLOCK(vp, 0); /* XXX */ 1154 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1156 VATTR_NULL(&va); 1157 va.va_size = 0; 1158 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1159 goto bad; 1160 } 1161 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1162 goto bad; 1163 if (flags & FWRITE) 1164 vp->v_writecount++; 1165 1166 /* done with modified vn_open, now finish what sys_open does. */ 1167 1168 fp->f_flag = flags & FMASK; 1169 fp->f_type = DTYPE_VNODE; 1170 fp->f_ops = &vnops; 1171 fp->f_data = (caddr_t)vp; 1172 if (flags & (O_EXLOCK | O_SHLOCK)) { 1173 lf.l_whence = SEEK_SET; 1174 lf.l_start = 0; 1175 lf.l_len = 0; 1176 if (flags & O_EXLOCK) 1177 lf.l_type = F_WRLCK; 1178 else 1179 lf.l_type = F_RDLCK; 1180 type = F_FLOCK; 1181 if ((flags & FNONBLOCK) == 0) 1182 type |= F_WAIT; 1183 VOP_UNLOCK(vp, 0); 1184 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1185 if (error) { 1186 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1187 FILE_UNUSE(fp, p); 1188 ffree(fp); 1189 fdp->fd_ofiles[indx] = NULL; 1190 return (error); 1191 } 1192 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1193 fp->f_flag |= FHASLOCK; 1194 } 1195 VOP_UNLOCK(vp, 0); 1196 *retval = indx; 1197 FILE_UNUSE(fp, p); 1198 return (0); 1199 1200 bad: 1201 FILE_UNUSE(fp, p); 1202 ffree(fp); 1203 fdp->fd_ofiles[indx] = NULL; 1204 if (vp != NULL) 1205 vput(vp); 1206 return (error); 1207 } 1208 1209 /* ARGSUSED */ 1210 int 1211 sys_fhstat(p, v, retval) 1212 struct proc *p; 1213 void *v; 1214 register_t *retval; 1215 { 1216 register struct sys_fhstat_args /* { 1217 syscallarg(const fhandle_t *) fhp; 1218 syscallarg(struct stat *) sb; 1219 } */ *uap = v; 1220 struct stat sb; 1221 int error; 1222 fhandle_t fh; 1223 struct mount *mp; 1224 struct vnode *vp; 1225 1226 /* 1227 * Must be super user 1228 */ 1229 if ((error = suser(p->p_ucred, &p->p_acflag))) 1230 return (error); 1231 1232 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1233 return (error); 1234 1235 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1236 return (ESTALE); 1237 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1238 return (error); 1239 error = vn_stat(vp, &sb, p); 1240 vput(vp); 1241 if (error) 1242 return (error); 1243 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1244 return (error); 1245 } 1246 1247 /* ARGSUSED */ 1248 int 1249 sys_fhstatfs(p, v, retval) 1250 struct proc *p; 1251 void *v; 1252 register_t *retval; 1253 { 1254 register struct sys_fhstatfs_args /* 1255 syscallarg(const fhandle_t *) fhp; 1256 syscallarg(struct statfs *) buf; 1257 } */ *uap = v; 1258 struct statfs sp; 1259 fhandle_t fh; 1260 struct mount *mp; 1261 struct vnode *vp; 1262 int error; 1263 1264 /* 1265 * Must be super user 1266 */ 1267 if ((error = suser(p->p_ucred, &p->p_acflag))) 1268 return (error); 1269 1270 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1271 return (error); 1272 1273 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1274 return (ESTALE); 1275 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1276 return (error); 1277 mp = vp->v_mount; 1278 vput(vp); 1279 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1280 return (error); 1281 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1282 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1283 } 1284 1285 /* 1286 * Create a special file. 1287 */ 1288 /* ARGSUSED */ 1289 int 1290 sys_mknod(p, v, retval) 1291 struct proc *p; 1292 void *v; 1293 register_t *retval; 1294 { 1295 register struct sys_mknod_args /* { 1296 syscallarg(const char *) path; 1297 syscallarg(int) mode; 1298 syscallarg(int) dev; 1299 } */ *uap = v; 1300 register struct vnode *vp; 1301 struct vattr vattr; 1302 int error; 1303 int whiteout = 0; 1304 struct nameidata nd; 1305 1306 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1307 return (error); 1308 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1309 if ((error = namei(&nd)) != 0) 1310 return (error); 1311 vp = nd.ni_vp; 1312 if (vp != NULL) 1313 error = EEXIST; 1314 else { 1315 VATTR_NULL(&vattr); 1316 vattr.va_mode = 1317 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1318 vattr.va_rdev = SCARG(uap, dev); 1319 whiteout = 0; 1320 1321 switch (SCARG(uap, mode) & S_IFMT) { 1322 case S_IFMT: /* used by badsect to flag bad sectors */ 1323 vattr.va_type = VBAD; 1324 break; 1325 case S_IFCHR: 1326 vattr.va_type = VCHR; 1327 break; 1328 case S_IFBLK: 1329 vattr.va_type = VBLK; 1330 break; 1331 case S_IFWHT: 1332 whiteout = 1; 1333 break; 1334 default: 1335 error = EINVAL; 1336 break; 1337 } 1338 } 1339 if (!error) { 1340 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1341 if (whiteout) { 1342 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1343 if (error) 1344 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1345 vput(nd.ni_dvp); 1346 } else { 1347 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1348 &nd.ni_cnd, &vattr); 1349 } 1350 } else { 1351 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1352 if (nd.ni_dvp == vp) 1353 vrele(nd.ni_dvp); 1354 else 1355 vput(nd.ni_dvp); 1356 if (vp) 1357 vrele(vp); 1358 } 1359 return (error); 1360 } 1361 1362 /* 1363 * Create a named pipe. 1364 */ 1365 /* ARGSUSED */ 1366 int 1367 sys_mkfifo(p, v, retval) 1368 struct proc *p; 1369 void *v; 1370 register_t *retval; 1371 { 1372 register struct sys_mkfifo_args /* { 1373 syscallarg(const char *) path; 1374 syscallarg(int) mode; 1375 } */ *uap = v; 1376 struct vattr vattr; 1377 int error; 1378 struct nameidata nd; 1379 1380 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1381 if ((error = namei(&nd)) != 0) 1382 return (error); 1383 if (nd.ni_vp != NULL) { 1384 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1385 if (nd.ni_dvp == nd.ni_vp) 1386 vrele(nd.ni_dvp); 1387 else 1388 vput(nd.ni_dvp); 1389 vrele(nd.ni_vp); 1390 return (EEXIST); 1391 } 1392 VATTR_NULL(&vattr); 1393 vattr.va_type = VFIFO; 1394 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1395 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1396 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1397 } 1398 1399 /* 1400 * Make a hard file link. 1401 */ 1402 /* ARGSUSED */ 1403 int 1404 sys_link(p, v, retval) 1405 struct proc *p; 1406 void *v; 1407 register_t *retval; 1408 { 1409 register struct sys_link_args /* { 1410 syscallarg(const char *) path; 1411 syscallarg(const char *) link; 1412 } */ *uap = v; 1413 register struct vnode *vp; 1414 struct nameidata nd; 1415 int error; 1416 1417 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1418 if ((error = namei(&nd)) != 0) 1419 return (error); 1420 vp = nd.ni_vp; 1421 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1422 if ((error = namei(&nd)) != 0) 1423 goto out; 1424 if (nd.ni_vp) { 1425 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1426 if (nd.ni_dvp == nd.ni_vp) 1427 vrele(nd.ni_dvp); 1428 else 1429 vput(nd.ni_dvp); 1430 vrele(nd.ni_vp); 1431 error = EEXIST; 1432 goto out; 1433 } 1434 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1435 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1436 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1437 out: 1438 vrele(vp); 1439 return (error); 1440 } 1441 1442 /* 1443 * Make a symbolic link. 1444 */ 1445 /* ARGSUSED */ 1446 int 1447 sys_symlink(p, v, retval) 1448 struct proc *p; 1449 void *v; 1450 register_t *retval; 1451 { 1452 register struct sys_symlink_args /* { 1453 syscallarg(const char *) path; 1454 syscallarg(const char *) link; 1455 } */ *uap = v; 1456 struct vattr vattr; 1457 char *path; 1458 int error; 1459 struct nameidata nd; 1460 1461 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1462 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1463 if (error) 1464 goto out; 1465 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1466 if ((error = namei(&nd)) != 0) 1467 goto out; 1468 if (nd.ni_vp) { 1469 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1470 if (nd.ni_dvp == nd.ni_vp) 1471 vrele(nd.ni_dvp); 1472 else 1473 vput(nd.ni_dvp); 1474 vrele(nd.ni_vp); 1475 error = EEXIST; 1476 goto out; 1477 } 1478 VATTR_NULL(&vattr); 1479 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1480 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1481 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1482 out: 1483 FREE(path, M_NAMEI); 1484 return (error); 1485 } 1486 1487 /* 1488 * Delete a whiteout from the filesystem. 1489 */ 1490 /* ARGSUSED */ 1491 int 1492 sys_undelete(p, v, retval) 1493 struct proc *p; 1494 void *v; 1495 register_t *retval; 1496 { 1497 register struct sys_undelete_args /* { 1498 syscallarg(const char *) path; 1499 } */ *uap = v; 1500 int error; 1501 struct nameidata nd; 1502 1503 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1504 SCARG(uap, path), p); 1505 error = namei(&nd); 1506 if (error) 1507 return (error); 1508 1509 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1510 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1511 if (nd.ni_dvp == nd.ni_vp) 1512 vrele(nd.ni_dvp); 1513 else 1514 vput(nd.ni_dvp); 1515 if (nd.ni_vp) 1516 vrele(nd.ni_vp); 1517 return (EEXIST); 1518 } 1519 1520 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1521 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1522 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1523 vput(nd.ni_dvp); 1524 return (error); 1525 } 1526 1527 /* 1528 * Delete a name from the filesystem. 1529 */ 1530 /* ARGSUSED */ 1531 int 1532 sys_unlink(p, v, retval) 1533 struct proc *p; 1534 void *v; 1535 register_t *retval; 1536 { 1537 struct sys_unlink_args /* { 1538 syscallarg(const char *) path; 1539 } */ *uap = v; 1540 register struct vnode *vp; 1541 int error; 1542 struct nameidata nd; 1543 1544 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1545 SCARG(uap, path), p); 1546 if ((error = namei(&nd)) != 0) 1547 return (error); 1548 vp = nd.ni_vp; 1549 1550 /* 1551 * The root of a mounted filesystem cannot be deleted. 1552 */ 1553 if (vp->v_flag & VROOT) { 1554 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1555 if (nd.ni_dvp == vp) 1556 vrele(nd.ni_dvp); 1557 else 1558 vput(nd.ni_dvp); 1559 vput(vp); 1560 error = EBUSY; 1561 goto out; 1562 } 1563 1564 (void)uvm_vnp_uncache(vp); 1565 1566 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1567 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1568 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1569 out: 1570 return (error); 1571 } 1572 1573 /* 1574 * Reposition read/write file offset. 1575 */ 1576 int 1577 sys_lseek(p, v, retval) 1578 struct proc *p; 1579 void *v; 1580 register_t *retval; 1581 { 1582 register struct sys_lseek_args /* { 1583 syscallarg(int) fd; 1584 syscallarg(int) pad; 1585 syscallarg(off_t) offset; 1586 syscallarg(int) whence; 1587 } */ *uap = v; 1588 struct ucred *cred = p->p_ucred; 1589 register struct filedesc *fdp = p->p_fd; 1590 register struct file *fp; 1591 struct vnode *vp; 1592 struct vattr vattr; 1593 register off_t newoff; 1594 int error; 1595 1596 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1597 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1598 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1599 return (EBADF); 1600 1601 FILE_USE(fp); 1602 1603 vp = (struct vnode *)fp->f_data; 1604 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1605 error = ESPIPE; 1606 goto out; 1607 } 1608 1609 switch (SCARG(uap, whence)) { 1610 case SEEK_CUR: 1611 newoff = fp->f_offset + SCARG(uap, offset); 1612 break; 1613 case SEEK_END: 1614 error = VOP_GETATTR(vp, &vattr, cred, p); 1615 if (error) 1616 goto out; 1617 newoff = SCARG(uap, offset) + vattr.va_size; 1618 break; 1619 case SEEK_SET: 1620 newoff = SCARG(uap, offset); 1621 break; 1622 default: 1623 error = EINVAL; 1624 goto out; 1625 } 1626 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1627 goto out; 1628 1629 *(off_t *)retval = fp->f_offset = newoff; 1630 out: 1631 FILE_UNUSE(fp, p); 1632 return (error); 1633 } 1634 1635 /* 1636 * Positional read system call. 1637 */ 1638 int 1639 sys_pread(p, v, retval) 1640 struct proc *p; 1641 void *v; 1642 register_t *retval; 1643 { 1644 struct sys_pread_args /* { 1645 syscallarg(int) fd; 1646 syscallarg(void *) buf; 1647 syscallarg(size_t) nbyte; 1648 syscallarg(off_t) offset; 1649 } */ *uap = v; 1650 struct filedesc *fdp = p->p_fd; 1651 struct file *fp; 1652 struct vnode *vp; 1653 off_t offset; 1654 int error, fd = SCARG(uap, fd); 1655 1656 if ((u_int)fd >= fdp->fd_nfiles || 1657 (fp = fdp->fd_ofiles[fd]) == NULL || 1658 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1659 (fp->f_flag & FREAD) == 0) 1660 return (EBADF); 1661 1662 FILE_USE(fp); 1663 1664 vp = (struct vnode *)fp->f_data; 1665 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1666 error = ESPIPE; 1667 goto out; 1668 } 1669 1670 offset = SCARG(uap, offset); 1671 1672 /* 1673 * XXX This works because no file systems actually 1674 * XXX take any action on the seek operation. 1675 */ 1676 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1677 goto out; 1678 1679 /* dofileread() will unuse the descriptor for us */ 1680 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1681 &offset, 0, retval)); 1682 1683 out: 1684 FILE_UNUSE(fp, p); 1685 return (error); 1686 } 1687 1688 /* 1689 * Positional scatter read system call. 1690 */ 1691 int 1692 sys_preadv(p, v, retval) 1693 struct proc *p; 1694 void *v; 1695 register_t *retval; 1696 { 1697 struct sys_preadv_args /* { 1698 syscallarg(int) fd; 1699 syscallarg(const struct iovec *) iovp; 1700 syscallarg(int) iovcnt; 1701 syscallarg(off_t) offset; 1702 } */ *uap = v; 1703 struct filedesc *fdp = p->p_fd; 1704 struct file *fp; 1705 struct vnode *vp; 1706 off_t offset; 1707 int error, fd = SCARG(uap, fd); 1708 1709 if ((u_int)fd >= fdp->fd_nfiles || 1710 (fp = fdp->fd_ofiles[fd]) == NULL || 1711 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1712 (fp->f_flag & FREAD) == 0) 1713 return (EBADF); 1714 1715 FILE_USE(fp); 1716 1717 vp = (struct vnode *)fp->f_data; 1718 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1719 error = ESPIPE; 1720 goto out; 1721 } 1722 1723 offset = SCARG(uap, offset); 1724 1725 /* 1726 * XXX This works because no file systems actually 1727 * XXX take any action on the seek operation. 1728 */ 1729 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1730 goto out; 1731 1732 /* dofilereadv() will unuse the descriptor for us */ 1733 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1734 &offset, 0, retval)); 1735 1736 out: 1737 FILE_UNUSE(fp, p); 1738 return (error); 1739 } 1740 1741 /* 1742 * Positional write system call. 1743 */ 1744 int 1745 sys_pwrite(p, v, retval) 1746 struct proc *p; 1747 void *v; 1748 register_t *retval; 1749 { 1750 struct sys_pwrite_args /* { 1751 syscallarg(int) fd; 1752 syscallarg(const void *) buf; 1753 syscallarg(size_t) nbyte; 1754 syscallarg(off_t) offset; 1755 } */ *uap = v; 1756 struct filedesc *fdp = p->p_fd; 1757 struct file *fp; 1758 struct vnode *vp; 1759 off_t offset; 1760 int error, fd = SCARG(uap, fd); 1761 1762 if ((u_int)fd >= fdp->fd_nfiles || 1763 (fp = fdp->fd_ofiles[fd]) == NULL || 1764 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1765 (fp->f_flag & FWRITE) == 0) 1766 return (EBADF); 1767 1768 FILE_USE(fp); 1769 1770 vp = (struct vnode *)fp->f_data; 1771 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1772 error = ESPIPE; 1773 goto out; 1774 } 1775 1776 offset = SCARG(uap, offset); 1777 1778 /* 1779 * XXX This works because no file systems actually 1780 * XXX take any action on the seek operation. 1781 */ 1782 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1783 goto out; 1784 1785 /* dofilewrite() will unuse the descriptor for us */ 1786 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1787 &offset, 0, retval)); 1788 1789 out: 1790 FILE_UNUSE(fp, p); 1791 return (error); 1792 } 1793 1794 /* 1795 * Positional gather write system call. 1796 */ 1797 int 1798 sys_pwritev(p, v, retval) 1799 struct proc *p; 1800 void *v; 1801 register_t *retval; 1802 { 1803 struct sys_pwritev_args /* { 1804 syscallarg(int) fd; 1805 syscallarg(const struct iovec *) iovp; 1806 syscallarg(int) iovcnt; 1807 syscallarg(off_t) offset; 1808 } */ *uap = v; 1809 struct filedesc *fdp = p->p_fd; 1810 struct file *fp; 1811 struct vnode *vp; 1812 off_t offset; 1813 int error, fd = SCARG(uap, fd); 1814 1815 if ((u_int)fd >= fdp->fd_nfiles || 1816 (fp = fdp->fd_ofiles[fd]) == NULL || 1817 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1818 (fp->f_flag & FWRITE) == 0) 1819 return (EBADF); 1820 1821 FILE_USE(fp); 1822 1823 vp = (struct vnode *)fp->f_data; 1824 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1825 error = ESPIPE; 1826 goto out; 1827 } 1828 1829 offset = SCARG(uap, offset); 1830 1831 /* 1832 * XXX This works because no file systems actually 1833 * XXX take any action on the seek operation. 1834 */ 1835 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1836 goto out; 1837 1838 /* dofilewritev() will unuse the descriptor for us */ 1839 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1840 &offset, 0, retval)); 1841 1842 out: 1843 FILE_UNUSE(fp, p); 1844 return (error); 1845 } 1846 1847 /* 1848 * Check access permissions. 1849 */ 1850 int 1851 sys_access(p, v, retval) 1852 struct proc *p; 1853 void *v; 1854 register_t *retval; 1855 { 1856 register struct sys_access_args /* { 1857 syscallarg(const char *) path; 1858 syscallarg(int) flags; 1859 } */ *uap = v; 1860 register struct ucred *cred = p->p_ucred; 1861 register struct vnode *vp; 1862 int error, flags, t_gid, t_uid; 1863 struct nameidata nd; 1864 1865 t_uid = cred->cr_uid; 1866 t_gid = cred->cr_gid; 1867 cred->cr_uid = p->p_cred->p_ruid; 1868 cred->cr_gid = p->p_cred->p_rgid; 1869 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1870 SCARG(uap, path), p); 1871 if ((error = namei(&nd)) != 0) 1872 goto out1; 1873 vp = nd.ni_vp; 1874 1875 /* Flags == 0 means only check for existence. */ 1876 if (SCARG(uap, flags)) { 1877 flags = 0; 1878 if (SCARG(uap, flags) & R_OK) 1879 flags |= VREAD; 1880 if (SCARG(uap, flags) & W_OK) 1881 flags |= VWRITE; 1882 if (SCARG(uap, flags) & X_OK) 1883 flags |= VEXEC; 1884 1885 error = VOP_ACCESS(vp, flags, cred, p); 1886 if (!error && (flags & VWRITE)) 1887 error = vn_writechk(vp); 1888 } 1889 vput(vp); 1890 out1: 1891 cred->cr_uid = t_uid; 1892 cred->cr_gid = t_gid; 1893 return (error); 1894 } 1895 1896 /* 1897 * Get file status; this version follows links. 1898 */ 1899 /* ARGSUSED */ 1900 int 1901 sys___stat13(p, v, retval) 1902 struct proc *p; 1903 void *v; 1904 register_t *retval; 1905 { 1906 register struct sys___stat13_args /* { 1907 syscallarg(const char *) path; 1908 syscallarg(struct stat *) ub; 1909 } */ *uap = v; 1910 struct stat sb; 1911 int error; 1912 struct nameidata nd; 1913 1914 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1915 SCARG(uap, path), p); 1916 if ((error = namei(&nd)) != 0) 1917 return (error); 1918 error = vn_stat(nd.ni_vp, &sb, p); 1919 vput(nd.ni_vp); 1920 if (error) 1921 return (error); 1922 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1923 return (error); 1924 } 1925 1926 /* 1927 * Get file status; this version does not follow links. 1928 */ 1929 /* ARGSUSED */ 1930 int 1931 sys___lstat13(p, v, retval) 1932 struct proc *p; 1933 void *v; 1934 register_t *retval; 1935 { 1936 register struct sys___lstat13_args /* { 1937 syscallarg(const char *) path; 1938 syscallarg(struct stat *) ub; 1939 } */ *uap = v; 1940 struct stat sb; 1941 int error; 1942 struct nameidata nd; 1943 1944 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1945 SCARG(uap, path), p); 1946 if ((error = namei(&nd)) != 0) 1947 return (error); 1948 error = vn_stat(nd.ni_vp, &sb, p); 1949 vput(nd.ni_vp); 1950 if (error) 1951 return (error); 1952 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1953 return (error); 1954 } 1955 1956 /* 1957 * Get configurable pathname variables. 1958 */ 1959 /* ARGSUSED */ 1960 int 1961 sys_pathconf(p, v, retval) 1962 struct proc *p; 1963 void *v; 1964 register_t *retval; 1965 { 1966 register struct sys_pathconf_args /* { 1967 syscallarg(const char *) path; 1968 syscallarg(int) name; 1969 } */ *uap = v; 1970 int error; 1971 struct nameidata nd; 1972 1973 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1974 SCARG(uap, path), p); 1975 if ((error = namei(&nd)) != 0) 1976 return (error); 1977 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1978 vput(nd.ni_vp); 1979 return (error); 1980 } 1981 1982 /* 1983 * Return target name of a symbolic link. 1984 */ 1985 /* ARGSUSED */ 1986 int 1987 sys_readlink(p, v, retval) 1988 struct proc *p; 1989 void *v; 1990 register_t *retval; 1991 { 1992 register struct sys_readlink_args /* { 1993 syscallarg(const char *) path; 1994 syscallarg(char *) buf; 1995 syscallarg(size_t) count; 1996 } */ *uap = v; 1997 register struct vnode *vp; 1998 struct iovec aiov; 1999 struct uio auio; 2000 int error; 2001 struct nameidata nd; 2002 2003 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2004 SCARG(uap, path), p); 2005 if ((error = namei(&nd)) != 0) 2006 return (error); 2007 vp = nd.ni_vp; 2008 if (vp->v_type != VLNK) 2009 error = EINVAL; 2010 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2011 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2012 aiov.iov_base = SCARG(uap, buf); 2013 aiov.iov_len = SCARG(uap, count); 2014 auio.uio_iov = &aiov; 2015 auio.uio_iovcnt = 1; 2016 auio.uio_offset = 0; 2017 auio.uio_rw = UIO_READ; 2018 auio.uio_segflg = UIO_USERSPACE; 2019 auio.uio_procp = p; 2020 auio.uio_resid = SCARG(uap, count); 2021 error = VOP_READLINK(vp, &auio, p->p_ucred); 2022 } 2023 vput(vp); 2024 *retval = SCARG(uap, count) - auio.uio_resid; 2025 return (error); 2026 } 2027 2028 /* 2029 * Change flags of a file given a path name. 2030 */ 2031 /* ARGSUSED */ 2032 int 2033 sys_chflags(p, v, retval) 2034 struct proc *p; 2035 void *v; 2036 register_t *retval; 2037 { 2038 register struct sys_chflags_args /* { 2039 syscallarg(const char *) path; 2040 syscallarg(u_long) flags; 2041 } */ *uap = v; 2042 register struct vnode *vp; 2043 struct vattr vattr; 2044 int error; 2045 struct nameidata nd; 2046 2047 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2048 if ((error = namei(&nd)) != 0) 2049 return (error); 2050 vp = nd.ni_vp; 2051 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2052 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2053 /* Non-superusers cannot change the flags on devices, even if they 2054 own them. */ 2055 if (suser(p->p_ucred, &p->p_acflag)) { 2056 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2057 goto out; 2058 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2059 error = EINVAL; 2060 goto out; 2061 } 2062 } 2063 VATTR_NULL(&vattr); 2064 vattr.va_flags = SCARG(uap, flags); 2065 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2066 out: 2067 vput(vp); 2068 return (error); 2069 } 2070 2071 /* 2072 * Change flags of a file given a file descriptor. 2073 */ 2074 /* ARGSUSED */ 2075 int 2076 sys_fchflags(p, v, retval) 2077 struct proc *p; 2078 void *v; 2079 register_t *retval; 2080 { 2081 register struct sys_fchflags_args /* { 2082 syscallarg(int) fd; 2083 syscallarg(u_long) flags; 2084 } */ *uap = v; 2085 struct vattr vattr; 2086 struct vnode *vp; 2087 struct file *fp; 2088 int error; 2089 2090 /* getvnode() will use the descriptor for us */ 2091 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2092 return (error); 2093 vp = (struct vnode *)fp->f_data; 2094 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2095 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2096 /* Non-superusers cannot change the flags on devices, even if they 2097 own them. */ 2098 if (suser(p->p_ucred, &p->p_acflag)) { 2099 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2100 != 0) 2101 goto out; 2102 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2103 error = EINVAL; 2104 goto out; 2105 } 2106 } 2107 VATTR_NULL(&vattr); 2108 vattr.va_flags = SCARG(uap, flags); 2109 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2110 out: 2111 VOP_UNLOCK(vp, 0); 2112 FILE_UNUSE(fp, p); 2113 return (error); 2114 } 2115 2116 /* 2117 * Change mode of a file given path name; this version follows links. 2118 */ 2119 /* ARGSUSED */ 2120 int 2121 sys_chmod(p, v, retval) 2122 struct proc *p; 2123 void *v; 2124 register_t *retval; 2125 { 2126 register struct sys_chmod_args /* { 2127 syscallarg(const char *) path; 2128 syscallarg(int) mode; 2129 } */ *uap = v; 2130 int error; 2131 struct nameidata nd; 2132 2133 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2134 if ((error = namei(&nd)) != 0) 2135 return (error); 2136 2137 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2138 2139 vrele(nd.ni_vp); 2140 return (error); 2141 } 2142 2143 /* 2144 * Change mode of a file given a file descriptor. 2145 */ 2146 /* ARGSUSED */ 2147 int 2148 sys_fchmod(p, v, retval) 2149 struct proc *p; 2150 void *v; 2151 register_t *retval; 2152 { 2153 register struct sys_fchmod_args /* { 2154 syscallarg(int) fd; 2155 syscallarg(int) mode; 2156 } */ *uap = v; 2157 struct file *fp; 2158 int error; 2159 2160 /* getvnode() will use the descriptor for us */ 2161 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2162 return (error); 2163 2164 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2165 FILE_UNUSE(fp, p); 2166 return (error); 2167 } 2168 2169 /* 2170 * Change mode of a file given path name; this version does not follow links. 2171 */ 2172 /* ARGSUSED */ 2173 int 2174 sys_lchmod(p, v, retval) 2175 struct proc *p; 2176 void *v; 2177 register_t *retval; 2178 { 2179 register struct sys_lchmod_args /* { 2180 syscallarg(const char *) path; 2181 syscallarg(int) mode; 2182 } */ *uap = v; 2183 int error; 2184 struct nameidata nd; 2185 2186 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2187 if ((error = namei(&nd)) != 0) 2188 return (error); 2189 2190 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2191 2192 vrele(nd.ni_vp); 2193 return (error); 2194 } 2195 2196 /* 2197 * Common routine to set mode given a vnode. 2198 */ 2199 static int 2200 change_mode(vp, mode, p) 2201 struct vnode *vp; 2202 int mode; 2203 struct proc *p; 2204 { 2205 struct vattr vattr; 2206 int error; 2207 2208 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2209 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2210 VATTR_NULL(&vattr); 2211 vattr.va_mode = mode & ALLPERMS; 2212 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2213 VOP_UNLOCK(vp, 0); 2214 return (error); 2215 } 2216 2217 /* 2218 * Set ownership given a path name; this version follows links. 2219 */ 2220 /* ARGSUSED */ 2221 int 2222 sys_chown(p, v, retval) 2223 struct proc *p; 2224 void *v; 2225 register_t *retval; 2226 { 2227 register struct sys_chown_args /* { 2228 syscallarg(const char *) path; 2229 syscallarg(uid_t) uid; 2230 syscallarg(gid_t) gid; 2231 } */ *uap = v; 2232 int error; 2233 struct nameidata nd; 2234 2235 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2236 if ((error = namei(&nd)) != 0) 2237 return (error); 2238 2239 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2240 2241 vrele(nd.ni_vp); 2242 return (error); 2243 } 2244 2245 /* 2246 * Set ownership given a path name; this version follows links. 2247 * Provides POSIX semantics. 2248 */ 2249 /* ARGSUSED */ 2250 int 2251 sys___posix_chown(p, v, retval) 2252 struct proc *p; 2253 void *v; 2254 register_t *retval; 2255 { 2256 register struct sys_chown_args /* { 2257 syscallarg(const char *) path; 2258 syscallarg(uid_t) uid; 2259 syscallarg(gid_t) gid; 2260 } */ *uap = v; 2261 int error; 2262 struct nameidata nd; 2263 2264 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2265 if ((error = namei(&nd)) != 0) 2266 return (error); 2267 2268 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2269 2270 vrele(nd.ni_vp); 2271 return (error); 2272 } 2273 2274 /* 2275 * Set ownership given a file descriptor. 2276 */ 2277 /* ARGSUSED */ 2278 int 2279 sys_fchown(p, v, retval) 2280 struct proc *p; 2281 void *v; 2282 register_t *retval; 2283 { 2284 register struct sys_fchown_args /* { 2285 syscallarg(int) fd; 2286 syscallarg(uid_t) uid; 2287 syscallarg(gid_t) gid; 2288 } */ *uap = v; 2289 int error; 2290 struct file *fp; 2291 2292 /* getvnode() will use the descriptor for us */ 2293 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2294 return (error); 2295 2296 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2297 SCARG(uap, gid), p, 0); 2298 FILE_UNUSE(fp, p); 2299 return (error); 2300 } 2301 2302 /* 2303 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2304 */ 2305 /* ARGSUSED */ 2306 int 2307 sys___posix_fchown(p, v, retval) 2308 struct proc *p; 2309 void *v; 2310 register_t *retval; 2311 { 2312 register struct sys_fchown_args /* { 2313 syscallarg(int) fd; 2314 syscallarg(uid_t) uid; 2315 syscallarg(gid_t) gid; 2316 } */ *uap = v; 2317 int error; 2318 struct file *fp; 2319 2320 /* getvnode() will use the descriptor for us */ 2321 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2322 return (error); 2323 2324 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2325 SCARG(uap, gid), p, 1); 2326 FILE_UNUSE(fp, p); 2327 return (error); 2328 } 2329 2330 /* 2331 * Set ownership given a path name; this version does not follow links. 2332 */ 2333 /* ARGSUSED */ 2334 int 2335 sys_lchown(p, v, retval) 2336 struct proc *p; 2337 void *v; 2338 register_t *retval; 2339 { 2340 register struct sys_lchown_args /* { 2341 syscallarg(const char *) path; 2342 syscallarg(uid_t) uid; 2343 syscallarg(gid_t) gid; 2344 } */ *uap = v; 2345 int error; 2346 struct nameidata nd; 2347 2348 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2349 if ((error = namei(&nd)) != 0) 2350 return (error); 2351 2352 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2353 2354 vrele(nd.ni_vp); 2355 return (error); 2356 } 2357 2358 /* 2359 * Set ownership given a path name; this version does not follow links. 2360 * Provides POSIX/XPG semantics. 2361 */ 2362 /* ARGSUSED */ 2363 int 2364 sys___posix_lchown(p, v, retval) 2365 struct proc *p; 2366 void *v; 2367 register_t *retval; 2368 { 2369 register struct sys_lchown_args /* { 2370 syscallarg(const char *) path; 2371 syscallarg(uid_t) uid; 2372 syscallarg(gid_t) gid; 2373 } */ *uap = v; 2374 int error; 2375 struct nameidata nd; 2376 2377 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2378 if ((error = namei(&nd)) != 0) 2379 return (error); 2380 2381 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2382 2383 vrele(nd.ni_vp); 2384 return (error); 2385 } 2386 2387 /* 2388 * Common routine to set ownership given a vnode. 2389 */ 2390 static int 2391 change_owner(vp, uid, gid, p, posix_semantics) 2392 register struct vnode *vp; 2393 uid_t uid; 2394 gid_t gid; 2395 struct proc *p; 2396 int posix_semantics; 2397 { 2398 struct vattr vattr; 2399 mode_t newmode; 2400 int error; 2401 2402 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2403 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2404 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2405 goto out; 2406 2407 #define CHANGED(x) ((x) != -1) 2408 newmode = vattr.va_mode; 2409 if (posix_semantics) { 2410 /* 2411 * POSIX/XPG semantics: if the caller is not the super-user, 2412 * clear set-user-id and set-group-id bits. Both POSIX and 2413 * the XPG consider the behaviour for calls by the super-user 2414 * implementation-defined; we leave the set-user-id and set- 2415 * group-id settings intact in that case. 2416 */ 2417 if (suser(p->p_ucred, NULL) != 0) 2418 newmode &= ~(S_ISUID | S_ISGID); 2419 } else { 2420 /* 2421 * NetBSD semantics: when changing owner and/or group, 2422 * clear the respective bit(s). 2423 */ 2424 if (CHANGED(uid)) 2425 newmode &= ~S_ISUID; 2426 if (CHANGED(gid)) 2427 newmode &= ~S_ISGID; 2428 } 2429 /* Update va_mode iff altered. */ 2430 if (vattr.va_mode == newmode) 2431 newmode = VNOVAL; 2432 2433 VATTR_NULL(&vattr); 2434 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2435 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2436 vattr.va_mode = newmode; 2437 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2438 #undef CHANGED 2439 2440 out: 2441 VOP_UNLOCK(vp, 0); 2442 return (error); 2443 } 2444 2445 /* 2446 * Set the access and modification times given a path name; this 2447 * version follows links. 2448 */ 2449 /* ARGSUSED */ 2450 int 2451 sys_utimes(p, v, retval) 2452 struct proc *p; 2453 void *v; 2454 register_t *retval; 2455 { 2456 register struct sys_utimes_args /* { 2457 syscallarg(const char *) path; 2458 syscallarg(const struct timeval *) tptr; 2459 } */ *uap = v; 2460 int error; 2461 struct nameidata nd; 2462 2463 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2464 if ((error = namei(&nd)) != 0) 2465 return (error); 2466 2467 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2468 2469 vrele(nd.ni_vp); 2470 return (error); 2471 } 2472 2473 /* 2474 * Set the access and modification times given a file descriptor. 2475 */ 2476 /* ARGSUSED */ 2477 int 2478 sys_futimes(p, v, retval) 2479 struct proc *p; 2480 void *v; 2481 register_t *retval; 2482 { 2483 register struct sys_futimes_args /* { 2484 syscallarg(int) fd; 2485 syscallarg(const struct timeval *) tptr; 2486 } */ *uap = v; 2487 int error; 2488 struct file *fp; 2489 2490 /* getvnode() will use the descriptor for us */ 2491 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2492 return (error); 2493 2494 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2495 FILE_UNUSE(fp, p); 2496 return (error); 2497 } 2498 2499 /* 2500 * Set the access and modification times given a path name; this 2501 * version does not follow links. 2502 */ 2503 /* ARGSUSED */ 2504 int 2505 sys_lutimes(p, v, retval) 2506 struct proc *p; 2507 void *v; 2508 register_t *retval; 2509 { 2510 register struct sys_lutimes_args /* { 2511 syscallarg(const char *) path; 2512 syscallarg(const struct timeval *) tptr; 2513 } */ *uap = v; 2514 int error; 2515 struct nameidata nd; 2516 2517 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2518 if ((error = namei(&nd)) != 0) 2519 return (error); 2520 2521 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2522 2523 vrele(nd.ni_vp); 2524 return (error); 2525 } 2526 2527 /* 2528 * Common routine to set access and modification times given a vnode. 2529 */ 2530 static int 2531 change_utimes(vp, tptr, p) 2532 struct vnode *vp; 2533 const struct timeval *tptr; 2534 struct proc *p; 2535 { 2536 struct timeval tv[2]; 2537 struct vattr vattr; 2538 int error; 2539 2540 VATTR_NULL(&vattr); 2541 if (tptr == NULL) { 2542 microtime(&tv[0]); 2543 tv[1] = tv[0]; 2544 vattr.va_vaflags |= VA_UTIMES_NULL; 2545 } else { 2546 error = copyin(tptr, tv, sizeof(tv)); 2547 if (error) 2548 return (error); 2549 } 2550 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2551 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2552 vattr.va_atime.tv_sec = tv[0].tv_sec; 2553 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2554 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2555 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2556 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2557 VOP_UNLOCK(vp, 0); 2558 return (error); 2559 } 2560 2561 /* 2562 * Truncate a file given its path name. 2563 */ 2564 /* ARGSUSED */ 2565 int 2566 sys_truncate(p, v, retval) 2567 struct proc *p; 2568 void *v; 2569 register_t *retval; 2570 { 2571 register struct sys_truncate_args /* { 2572 syscallarg(const char *) path; 2573 syscallarg(int) pad; 2574 syscallarg(off_t) length; 2575 } */ *uap = v; 2576 register struct vnode *vp; 2577 struct vattr vattr; 2578 int error; 2579 struct nameidata nd; 2580 2581 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2582 if ((error = namei(&nd)) != 0) 2583 return (error); 2584 vp = nd.ni_vp; 2585 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2586 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2587 if (vp->v_type == VDIR) 2588 error = EISDIR; 2589 else if ((error = vn_writechk(vp)) == 0 && 2590 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2591 VATTR_NULL(&vattr); 2592 vattr.va_size = SCARG(uap, length); 2593 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2594 } 2595 vput(vp); 2596 return (error); 2597 } 2598 2599 /* 2600 * Truncate a file given a file descriptor. 2601 */ 2602 /* ARGSUSED */ 2603 int 2604 sys_ftruncate(p, v, retval) 2605 struct proc *p; 2606 void *v; 2607 register_t *retval; 2608 { 2609 register struct sys_ftruncate_args /* { 2610 syscallarg(int) fd; 2611 syscallarg(int) pad; 2612 syscallarg(off_t) length; 2613 } */ *uap = v; 2614 struct vattr vattr; 2615 struct vnode *vp; 2616 struct file *fp; 2617 int error; 2618 2619 /* getvnode() will use the descriptor for us */ 2620 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2621 return (error); 2622 if ((fp->f_flag & FWRITE) == 0) { 2623 error = EINVAL; 2624 goto out; 2625 } 2626 vp = (struct vnode *)fp->f_data; 2627 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2628 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2629 if (vp->v_type == VDIR) 2630 error = EISDIR; 2631 else if ((error = vn_writechk(vp)) == 0) { 2632 VATTR_NULL(&vattr); 2633 vattr.va_size = SCARG(uap, length); 2634 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2635 } 2636 VOP_UNLOCK(vp, 0); 2637 out: 2638 FILE_UNUSE(fp, p); 2639 return (error); 2640 } 2641 2642 /* 2643 * Sync an open file. 2644 */ 2645 /* ARGSUSED */ 2646 int 2647 sys_fsync(p, v, retval) 2648 struct proc *p; 2649 void *v; 2650 register_t *retval; 2651 { 2652 struct sys_fsync_args /* { 2653 syscallarg(int) fd; 2654 } */ *uap = v; 2655 register struct vnode *vp; 2656 struct file *fp; 2657 int error; 2658 2659 /* getvnode() will use the descriptor for us */ 2660 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2661 return (error); 2662 vp = (struct vnode *)fp->f_data; 2663 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2664 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2665 if (error == 0 && bioops.io_fsync != NULL) 2666 (*bioops.io_fsync)(vp); 2667 VOP_UNLOCK(vp, 0); 2668 FILE_UNUSE(fp, p); 2669 return (error); 2670 } 2671 2672 /* 2673 * Sync the data of an open file. 2674 */ 2675 /* ARGSUSED */ 2676 int 2677 sys_fdatasync(p, v, retval) 2678 struct proc *p; 2679 void *v; 2680 register_t *retval; 2681 { 2682 struct sys_fdatasync_args /* { 2683 syscallarg(int) fd; 2684 } */ *uap = v; 2685 struct vnode *vp; 2686 struct file *fp; 2687 int error; 2688 2689 /* getvnode() will use the descriptor for us */ 2690 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2691 return (error); 2692 vp = (struct vnode *)fp->f_data; 2693 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2694 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2695 if (error == 0 && bioops.io_fsync != NULL) 2696 (*bioops.io_fsync)(vp); 2697 VOP_UNLOCK(vp, 0); 2698 FILE_UNUSE(fp, p); 2699 return (error); 2700 } 2701 2702 /* 2703 * Rename files, (standard) BSD semantics frontend. 2704 */ 2705 /* ARGSUSED */ 2706 int 2707 sys_rename(p, v, retval) 2708 struct proc *p; 2709 void *v; 2710 register_t *retval; 2711 { 2712 register struct sys_rename_args /* { 2713 syscallarg(const char *) from; 2714 syscallarg(const char *) to; 2715 } */ *uap = v; 2716 2717 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2718 } 2719 2720 /* 2721 * Rename files, POSIX semantics frontend. 2722 */ 2723 /* ARGSUSED */ 2724 int 2725 sys___posix_rename(p, v, retval) 2726 struct proc *p; 2727 void *v; 2728 register_t *retval; 2729 { 2730 register struct sys___posix_rename_args /* { 2731 syscallarg(const char *) from; 2732 syscallarg(const char *) to; 2733 } */ *uap = v; 2734 2735 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2736 } 2737 2738 /* 2739 * Rename files. Source and destination must either both be directories, 2740 * or both not be directories. If target is a directory, it must be empty. 2741 * If `from' and `to' refer to the same object, the value of the `retain' 2742 * argument is used to determine whether `from' will be 2743 * 2744 * (retain == 0) deleted unless `from' and `to' refer to the same 2745 * object in the file system's name space (BSD). 2746 * (retain == 1) always retained (POSIX). 2747 */ 2748 static int 2749 rename_files(from, to, p, retain) 2750 const char *from, *to; 2751 struct proc *p; 2752 int retain; 2753 { 2754 register struct vnode *tvp, *fvp, *tdvp; 2755 struct nameidata fromnd, tond; 2756 int error; 2757 2758 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2759 from, p); 2760 if ((error = namei(&fromnd)) != 0) 2761 return (error); 2762 fvp = fromnd.ni_vp; 2763 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2764 UIO_USERSPACE, to, p); 2765 if ((error = namei(&tond)) != 0) { 2766 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2767 vrele(fromnd.ni_dvp); 2768 vrele(fvp); 2769 goto out1; 2770 } 2771 tdvp = tond.ni_dvp; 2772 tvp = tond.ni_vp; 2773 2774 if (tvp != NULL) { 2775 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2776 error = ENOTDIR; 2777 goto out; 2778 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2779 error = EISDIR; 2780 goto out; 2781 } 2782 } 2783 2784 if (fvp == tdvp) 2785 error = EINVAL; 2786 2787 /* 2788 * Source and destination refer to the same object. 2789 */ 2790 if (fvp == tvp) { 2791 if (retain) 2792 error = -1; 2793 else if (fromnd.ni_dvp == tdvp && 2794 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2795 !memcmp(fromnd.ni_cnd.cn_nameptr, 2796 tond.ni_cnd.cn_nameptr, 2797 fromnd.ni_cnd.cn_namelen)) 2798 error = -1; 2799 } 2800 2801 out: 2802 if (!error) { 2803 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2804 if (fromnd.ni_dvp != tdvp) 2805 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2806 if (tvp) { 2807 (void)uvm_vnp_uncache(tvp); 2808 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2809 } 2810 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2811 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2812 } else { 2813 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2814 if (tdvp == tvp) 2815 vrele(tdvp); 2816 else 2817 vput(tdvp); 2818 if (tvp) 2819 vput(tvp); 2820 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2821 vrele(fromnd.ni_dvp); 2822 vrele(fvp); 2823 } 2824 vrele(tond.ni_startdir); 2825 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2826 out1: 2827 if (fromnd.ni_startdir) 2828 vrele(fromnd.ni_startdir); 2829 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2830 return (error == -1 ? 0 : error); 2831 } 2832 2833 /* 2834 * Make a directory file. 2835 */ 2836 /* ARGSUSED */ 2837 int 2838 sys_mkdir(p, v, retval) 2839 struct proc *p; 2840 void *v; 2841 register_t *retval; 2842 { 2843 register struct sys_mkdir_args /* { 2844 syscallarg(const char *) path; 2845 syscallarg(int) mode; 2846 } */ *uap = v; 2847 register struct vnode *vp; 2848 struct vattr vattr; 2849 int error; 2850 struct nameidata nd; 2851 2852 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2853 if ((error = namei(&nd)) != 0) 2854 return (error); 2855 vp = nd.ni_vp; 2856 if (vp != NULL) { 2857 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2858 if (nd.ni_dvp == vp) 2859 vrele(nd.ni_dvp); 2860 else 2861 vput(nd.ni_dvp); 2862 vrele(vp); 2863 return (EEXIST); 2864 } 2865 VATTR_NULL(&vattr); 2866 vattr.va_type = VDIR; 2867 vattr.va_mode = 2868 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2869 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2870 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2871 if (!error) 2872 vput(nd.ni_vp); 2873 return (error); 2874 } 2875 2876 /* 2877 * Remove a directory file. 2878 */ 2879 /* ARGSUSED */ 2880 int 2881 sys_rmdir(p, v, retval) 2882 struct proc *p; 2883 void *v; 2884 register_t *retval; 2885 { 2886 struct sys_rmdir_args /* { 2887 syscallarg(const char *) path; 2888 } */ *uap = v; 2889 register struct vnode *vp; 2890 int error; 2891 struct nameidata nd; 2892 2893 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2894 SCARG(uap, path), p); 2895 if ((error = namei(&nd)) != 0) 2896 return (error); 2897 vp = nd.ni_vp; 2898 if (vp->v_type != VDIR) { 2899 error = ENOTDIR; 2900 goto out; 2901 } 2902 /* 2903 * No rmdir "." please. 2904 */ 2905 if (nd.ni_dvp == vp) { 2906 error = EINVAL; 2907 goto out; 2908 } 2909 /* 2910 * The root of a mounted filesystem cannot be deleted. 2911 */ 2912 if (vp->v_flag & VROOT) 2913 error = EBUSY; 2914 out: 2915 if (!error) { 2916 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2917 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2918 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2919 } else { 2920 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2921 if (nd.ni_dvp == vp) 2922 vrele(nd.ni_dvp); 2923 else 2924 vput(nd.ni_dvp); 2925 vput(vp); 2926 } 2927 return (error); 2928 } 2929 2930 /* 2931 * Read a block of directory entries in a file system independent format. 2932 */ 2933 int 2934 sys_getdents(p, v, retval) 2935 struct proc *p; 2936 void *v; 2937 register_t *retval; 2938 { 2939 register struct sys_getdents_args /* { 2940 syscallarg(int) fd; 2941 syscallarg(char *) buf; 2942 syscallarg(size_t) count; 2943 } */ *uap = v; 2944 struct file *fp; 2945 int error, done; 2946 2947 /* getvnode() will use the descriptor for us */ 2948 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2949 return (error); 2950 if ((fp->f_flag & FREAD) == 0) { 2951 error = EBADF; 2952 goto out; 2953 } 2954 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2955 SCARG(uap, count), &done, p, 0, 0); 2956 *retval = done; 2957 out: 2958 FILE_UNUSE(fp, p); 2959 return (error); 2960 } 2961 2962 /* 2963 * Set the mode mask for creation of filesystem nodes. 2964 */ 2965 int 2966 sys_umask(p, v, retval) 2967 struct proc *p; 2968 void *v; 2969 register_t *retval; 2970 { 2971 struct sys_umask_args /* { 2972 syscallarg(mode_t) newmask; 2973 } */ *uap = v; 2974 struct cwdinfo *cwdi; 2975 2976 cwdi = p->p_cwdi; 2977 *retval = cwdi->cwdi_cmask; 2978 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2979 return (0); 2980 } 2981 2982 /* 2983 * Void all references to file by ripping underlying filesystem 2984 * away from vnode. 2985 */ 2986 /* ARGSUSED */ 2987 int 2988 sys_revoke(p, v, retval) 2989 struct proc *p; 2990 void *v; 2991 register_t *retval; 2992 { 2993 register struct sys_revoke_args /* { 2994 syscallarg(const char *) path; 2995 } */ *uap = v; 2996 register struct vnode *vp; 2997 struct vattr vattr; 2998 int error; 2999 struct nameidata nd; 3000 3001 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3002 if ((error = namei(&nd)) != 0) 3003 return (error); 3004 vp = nd.ni_vp; 3005 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3006 goto out; 3007 if (p->p_ucred->cr_uid != vattr.va_uid && 3008 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3009 goto out; 3010 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3011 VOP_REVOKE(vp, REVOKEALL); 3012 out: 3013 vrele(vp); 3014 return (error); 3015 } 3016 3017 /* 3018 * Convert a user file descriptor to a kernel file entry. 3019 */ 3020 int 3021 getvnode(fdp, fd, fpp) 3022 struct filedesc *fdp; 3023 int fd; 3024 struct file **fpp; 3025 { 3026 struct vnode *vp; 3027 struct file *fp; 3028 3029 if ((u_int)fd >= fdp->fd_nfiles || 3030 (fp = fdp->fd_ofiles[fd]) == NULL || 3031 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3032 return (EBADF); 3033 3034 FILE_USE(fp); 3035 3036 if (fp->f_type != DTYPE_VNODE) { 3037 FILE_UNUSE(fp, NULL); 3038 return (EINVAL); 3039 } 3040 3041 vp = (struct vnode *)fp->f_data; 3042 if (vp->v_type == VBAD) { 3043 FILE_UNUSE(fp, NULL); 3044 return (EBADF); 3045 } 3046 3047 *fpp = fp; 3048 return (0); 3049 } 3050
Indexes created Fri Oct 03 02:09:57 GMT 2025