vfs_syscalls.c revision 1.158.2.2
1 /* $NetBSD: vfs_syscalls.c,v 1.158.2.2 2000/12/14 23:36:05 he 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 80 int dovfsusermount = 0; 81 82 /* 83 * Virtual File System System Calls 84 */ 85 86 /* 87 * Mount a file system. 88 */ 89 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 * Also note that not all of these had actual numbers in 4.3BSD 95 * or NetBSD 0.9! 96 */ 97 const char *mountcompatnames[] = { 98 NULL, /* 0 = MOUNT_NONE */ 99 MOUNT_FFS, /* 1 */ 100 MOUNT_NFS, /* 2 */ 101 MOUNT_MFS, /* 3 */ 102 MOUNT_MSDOS, /* 4 */ 103 MOUNT_LFS, /* 5 */ 104 NULL, /* 6 = MOUNT_LOFS */ 105 MOUNT_FDESC, /* 7 */ 106 MOUNT_PORTAL, /* 8 */ 107 MOUNT_NULL, /* 9 */ 108 MOUNT_UMAP, /* 10 */ 109 MOUNT_KERNFS, /* 11 */ 110 MOUNT_PROCFS, /* 12 */ 111 MOUNT_AFS, /* 13 */ 112 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 113 MOUNT_UNION, /* 15 */ 114 MOUNT_ADOSFS, /* 16 */ 115 MOUNT_EXT2FS, /* 17 */ 116 MOUNT_CODA, /* 18 */ 117 MOUNT_FILECORE, /* 19 */ 118 MOUNT_NTFS, /* 20 */ 119 }; 120 const int nmountcompatnames = sizeof(mountcompatnames) / 121 sizeof(mountcompatnames[0]); 122 123 /* ARGSUSED */ 124 int 125 sys_mount(p, v, retval) 126 struct proc *p; 127 void *v; 128 register_t *retval; 129 { 130 struct sys_mount_args /* { 131 syscallarg(const char *) type; 132 syscallarg(const char *) path; 133 syscallarg(int) flags; 134 syscallarg(void *) data; 135 } */ *uap = v; 136 struct vnode *vp; 137 struct mount *mp; 138 int error, flag = 0; 139 char fstypename[MFSNAMELEN]; 140 struct vattr va; 141 struct nameidata nd; 142 struct vfsops *vfs; 143 144 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 145 return (error); 146 /* 147 * Get vnode to be covered 148 */ 149 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 150 SCARG(uap, path), p); 151 if ((error = namei(&nd)) != 0) 152 return (error); 153 vp = nd.ni_vp; 154 /* 155 * A lookup in VFS_MOUNT might result in an attempt to 156 * lock this vnode again, so make the lock resursive. 157 */ 158 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 159 if (SCARG(uap, flags) & MNT_UPDATE) { 160 if ((vp->v_flag & VROOT) == 0) { 161 vput(vp); 162 return (EINVAL); 163 } 164 mp = vp->v_mount; 165 flag = mp->mnt_flag; 166 vfs = mp->mnt_op; 167 /* 168 * We only allow the filesystem to be reloaded if it 169 * is currently mounted read-only. 170 */ 171 if ((SCARG(uap, flags) & MNT_RELOAD) && 172 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 173 vput(vp); 174 return (EOPNOTSUPP); /* Needs translation */ 175 } 176 /* 177 * In "highly secure" mode, don't let the caller do anything 178 * but downgrade a filesystem from read-write to read-only. 179 * (see also below; MNT_UPDATE is required.) 180 */ 181 if (securelevel >= 2 && 182 (SCARG(uap, flags) != 183 (mp->mnt_flag | MNT_RDONLY | 184 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 185 vput(vp); 186 return (EPERM); 187 } 188 mp->mnt_flag |= 189 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 190 /* 191 * Only root, or the user that did the original mount is 192 * permitted to update it. 193 */ 194 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 195 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 196 vput(vp); 197 return (error); 198 } 199 /* 200 * Do not allow NFS export by non-root users. For non-root 201 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 202 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 203 */ 204 if (p->p_ucred->cr_uid != 0) { 205 if (SCARG(uap, flags) & MNT_EXPORTED) { 206 vput(vp); 207 return (EPERM); 208 } 209 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 210 if (flag & MNT_NOEXEC) 211 SCARG(uap, flags) |= MNT_NOEXEC; 212 } 213 if (vfs_busy(mp, LK_NOWAIT, 0)) { 214 vput(vp); 215 return (EPERM); 216 } 217 VOP_UNLOCK(vp, 0); 218 goto update; 219 } else { 220 if (securelevel >= 2) { 221 vput(vp); 222 return (EPERM); 223 } 224 } 225 /* 226 * If the user is not root, ensure that they own the directory 227 * onto which we are attempting to mount. 228 */ 229 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 230 (va.va_uid != p->p_ucred->cr_uid && 231 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 232 vput(vp); 233 return (error); 234 } 235 /* 236 * Do not allow NFS export by non-root users. For non-root users, 237 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 238 * mount point is already MNT_NOEXEC. 239 */ 240 if (p->p_ucred->cr_uid != 0) { 241 if (SCARG(uap, flags) & MNT_EXPORTED) { 242 vput(vp); 243 return (EPERM); 244 } 245 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 246 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 247 SCARG(uap, flags) |= MNT_NOEXEC; 248 } 249 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 250 return (error); 251 if (vp->v_type != VDIR) { 252 vput(vp); 253 return (ENOTDIR); 254 } 255 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 256 if (error) { 257 #if defined(COMPAT_09) || defined(COMPAT_43) 258 /* 259 * Historically filesystem types were identified by number. 260 * If we get an integer for the filesystem type instead of a 261 * string, we check to see if it matches one of the historic 262 * filesystem types. 263 */ 264 u_long fsindex = (u_long)SCARG(uap, type); 265 if (fsindex >= nmountcompatnames || 266 mountcompatnames[fsindex] == NULL) { 267 vput(vp); 268 return (ENODEV); 269 } 270 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 271 #else 272 vput(vp); 273 return (error); 274 #endif 275 } 276 #ifdef COMPAT_10 277 /* Accept `ufs' as an alias for `ffs'. */ 278 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 279 strncpy(fstypename, "ffs", MFSNAMELEN); 280 #endif 281 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 282 vput(vp); 283 return (ENODEV); 284 } 285 if (vp->v_mountedhere != NULL) { 286 vput(vp); 287 return (EBUSY); 288 } 289 290 /* 291 * Allocate and initialize the file system. 292 */ 293 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 294 M_MOUNT, M_WAITOK); 295 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 296 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 297 (void)vfs_busy(mp, LK_NOWAIT, 0); 298 mp->mnt_op = vfs; 299 vfs->vfs_refcount++; 300 mp->mnt_vnodecovered = vp; 301 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 302 mp->mnt_unmounter = NULL; 303 update: 304 /* 305 * Set the mount level flags. 306 */ 307 if (SCARG(uap, flags) & MNT_RDONLY) 308 mp->mnt_flag |= MNT_RDONLY; 309 else if (mp->mnt_flag & MNT_RDONLY) 310 mp->mnt_flag |= MNT_WANTRDWR; 311 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 312 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 313 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 314 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 315 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 316 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 317 MNT_SOFTDEP); 318 /* 319 * Mount the filesystem. 320 */ 321 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 322 if (mp->mnt_flag & MNT_UPDATE) { 323 vrele(vp); 324 if (mp->mnt_flag & MNT_WANTRDWR) 325 mp->mnt_flag &= ~MNT_RDONLY; 326 mp->mnt_flag &=~ 327 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 328 if (error) 329 mp->mnt_flag = flag; 330 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 331 if (mp->mnt_syncer == NULL) 332 error = vfs_allocate_syncvnode(mp); 333 } else { 334 if (mp->mnt_syncer != NULL) 335 vfs_deallocate_syncvnode(mp); 336 } 337 vfs_unbusy(mp); 338 return (error); 339 } 340 /* 341 * Put the new filesystem on the mount list after root. 342 */ 343 cache_purge(vp); 344 if (!error) { 345 vp->v_mountedhere = mp; 346 simple_lock(&mountlist_slock); 347 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 348 simple_unlock(&mountlist_slock); 349 checkdirs(vp); 350 VOP_UNLOCK(vp, 0); 351 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 352 error = vfs_allocate_syncvnode(mp); 353 vfs_unbusy(mp); 354 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 355 if ((error = VFS_START(mp, 0, p))) 356 vrele(vp); 357 } else { 358 vp->v_mountedhere = (struct mount *)0; 359 vfs->vfs_refcount--; 360 vfs_unbusy(mp); 361 free((caddr_t)mp, M_MOUNT); 362 vput(vp); 363 } 364 return (error); 365 } 366 367 /* 368 * Scan all active processes to see if any of them have a current 369 * or root directory onto which the new filesystem has just been 370 * mounted. If so, replace them with the new mount point. 371 */ 372 void 373 checkdirs(olddp) 374 struct vnode *olddp; 375 { 376 struct cwdinfo *cwdi; 377 struct vnode *newdp; 378 struct proc *p; 379 380 if (olddp->v_usecount == 1) 381 return; 382 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 383 panic("mount: lost mount"); 384 proclist_lock_read(); 385 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 386 cwdi = p->p_cwdi; 387 if (cwdi->cwdi_cdir == olddp) { 388 vrele(cwdi->cwdi_cdir); 389 VREF(newdp); 390 cwdi->cwdi_cdir = newdp; 391 } 392 if (cwdi->cwdi_rdir == olddp) { 393 vrele(cwdi->cwdi_rdir); 394 VREF(newdp); 395 cwdi->cwdi_rdir = newdp; 396 } 397 } 398 proclist_unlock_read(); 399 if (rootvnode == olddp) { 400 vrele(rootvnode); 401 VREF(newdp); 402 rootvnode = newdp; 403 } 404 vput(newdp); 405 } 406 407 /* 408 * Unmount a file system. 409 * 410 * Note: unmount takes a path to the vnode mounted on as argument, 411 * not special file (as before). 412 */ 413 /* ARGSUSED */ 414 int 415 sys_unmount(p, v, retval) 416 struct proc *p; 417 void *v; 418 register_t *retval; 419 { 420 struct sys_unmount_args /* { 421 syscallarg(const char *) path; 422 syscallarg(int) flags; 423 } */ *uap = v; 424 struct vnode *vp; 425 struct mount *mp; 426 int error; 427 struct nameidata nd; 428 429 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 430 SCARG(uap, path), p); 431 if ((error = namei(&nd)) != 0) 432 return (error); 433 vp = nd.ni_vp; 434 mp = vp->v_mount; 435 436 /* 437 * Only root, or the user that did the original mount is 438 * permitted to unmount this filesystem. 439 */ 440 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 441 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 442 vput(vp); 443 return (error); 444 } 445 446 /* 447 * Don't allow unmounting the root file system. 448 */ 449 if (mp->mnt_flag & MNT_ROOTFS) { 450 vput(vp); 451 return (EINVAL); 452 } 453 454 /* 455 * Must be the root of the filesystem 456 */ 457 if ((vp->v_flag & VROOT) == 0) { 458 vput(vp); 459 return (EINVAL); 460 } 461 vput(vp); 462 463 if (vfs_busy(mp, 0, 0)) 464 return (EBUSY); 465 466 return (dounmount(mp, SCARG(uap, flags), p)); 467 } 468 469 /* 470 * Do the actual file system unmount. File system is assumed to have been 471 * marked busy by the caller. 472 */ 473 int 474 dounmount(mp, flags, p) 475 struct mount *mp; 476 int flags; 477 struct proc *p; 478 { 479 struct vnode *coveredvp; 480 int error; 481 int async; 482 int used_syncer; 483 484 simple_lock(&mountlist_slock); 485 vfs_unbusy(mp); 486 used_syncer = (mp->mnt_syncer != NULL); 487 488 /* 489 * XXX Freeze syncer. This should really be done on a mountpoint 490 * basis, but especially the softdep code possibly called from 491 * the syncer doesn't exactly work on a per-mountpoint basis, 492 * so the softdep code would become a maze of vfs_busy calls. 493 */ 494 if (used_syncer) 495 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 496 497 mp->mnt_flag |= MNT_UNMOUNT; 498 mp->mnt_unmounter = p; 499 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 500 if (mp->mnt_flag & MNT_EXPUBLIC) 501 vfs_setpublicfs(NULL, NULL, NULL); 502 async = mp->mnt_flag & MNT_ASYNC; 503 mp->mnt_flag &= ~MNT_ASYNC; 504 cache_purgevfs(mp); /* remove cache entries for this file sys */ 505 if (mp->mnt_syncer != NULL) 506 vfs_deallocate_syncvnode(mp); 507 if (((mp->mnt_flag & MNT_RDONLY) || 508 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 509 (flags & MNT_FORCE)) 510 error = VFS_UNMOUNT(mp, flags, p); 511 simple_lock(&mountlist_slock); 512 if (error) { 513 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 514 (void) vfs_allocate_syncvnode(mp); 515 mp->mnt_flag &= ~MNT_UNMOUNT; 516 mp->mnt_unmounter = NULL; 517 mp->mnt_flag |= async; 518 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 519 &mountlist_slock); 520 if (used_syncer) 521 lockmgr(&syncer_lock, LK_RELEASE, NULL); 522 while (mp->mnt_wcnt > 0) { 523 wakeup((caddr_t)mp); 524 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 525 } 526 return (error); 527 } 528 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 529 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 530 coveredvp->v_mountedhere = NULL; 531 vrele(coveredvp); 532 } 533 mp->mnt_op->vfs_refcount--; 534 if (mp->mnt_vnodelist.lh_first != NULL) 535 panic("unmount: dangling vnode"); 536 mp->mnt_flag |= MNT_GONE; 537 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 538 if (used_syncer) 539 lockmgr(&syncer_lock, LK_RELEASE, NULL); 540 while(mp->mnt_wcnt > 0) { 541 wakeup((caddr_t)mp); 542 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 543 } 544 free((caddr_t)mp, M_MOUNT); 545 return (0); 546 } 547 548 /* 549 * Sync each mounted filesystem. 550 */ 551 #ifdef DEBUG 552 int syncprt = 0; 553 struct ctldebug debug0 = { "syncprt", &syncprt }; 554 #endif 555 556 /* ARGSUSED */ 557 int 558 sys_sync(p, v, retval) 559 struct proc *p; 560 void *v; 561 register_t *retval; 562 { 563 struct mount *mp, *nmp; 564 int asyncflag; 565 566 simple_lock(&mountlist_slock); 567 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 568 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 569 nmp = mp->mnt_list.cqe_prev; 570 continue; 571 } 572 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 573 asyncflag = mp->mnt_flag & MNT_ASYNC; 574 mp->mnt_flag &= ~MNT_ASYNC; 575 uvm_vnp_sync(mp); 576 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 577 if (asyncflag) 578 mp->mnt_flag |= MNT_ASYNC; 579 } 580 simple_lock(&mountlist_slock); 581 nmp = mp->mnt_list.cqe_prev; 582 vfs_unbusy(mp); 583 584 } 585 simple_unlock(&mountlist_slock); 586 #ifdef DEBUG 587 if (syncprt) 588 vfs_bufstats(); 589 #endif /* DEBUG */ 590 return (0); 591 } 592 593 /* 594 * Change filesystem quotas. 595 */ 596 /* ARGSUSED */ 597 int 598 sys_quotactl(p, v, retval) 599 struct proc *p; 600 void *v; 601 register_t *retval; 602 { 603 struct sys_quotactl_args /* { 604 syscallarg(const char *) path; 605 syscallarg(int) cmd; 606 syscallarg(int) uid; 607 syscallarg(caddr_t) arg; 608 } */ *uap = v; 609 struct mount *mp; 610 int error; 611 struct nameidata nd; 612 613 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 614 if ((error = namei(&nd)) != 0) 615 return (error); 616 mp = nd.ni_vp->v_mount; 617 vrele(nd.ni_vp); 618 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 619 SCARG(uap, arg), p)); 620 } 621 622 /* 623 * Get filesystem statistics. 624 */ 625 /* ARGSUSED */ 626 int 627 sys_statfs(p, v, retval) 628 struct proc *p; 629 void *v; 630 register_t *retval; 631 { 632 struct sys_statfs_args /* { 633 syscallarg(const char *) path; 634 syscallarg(struct statfs *) buf; 635 } */ *uap = v; 636 struct mount *mp; 637 struct statfs *sp; 638 int error; 639 struct nameidata nd; 640 641 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 642 if ((error = namei(&nd)) != 0) 643 return (error); 644 mp = nd.ni_vp->v_mount; 645 sp = &mp->mnt_stat; 646 vrele(nd.ni_vp); 647 if ((error = VFS_STATFS(mp, sp, p)) != 0) 648 return (error); 649 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 650 sp->f_oflags = sp->f_flags & 0xffff; 651 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 652 } 653 654 /* 655 * Get filesystem statistics. 656 */ 657 /* ARGSUSED */ 658 int 659 sys_fstatfs(p, v, retval) 660 struct proc *p; 661 void *v; 662 register_t *retval; 663 { 664 struct sys_fstatfs_args /* { 665 syscallarg(int) fd; 666 syscallarg(struct statfs *) buf; 667 } */ *uap = v; 668 struct file *fp; 669 struct mount *mp; 670 struct statfs *sp; 671 int error; 672 673 /* getvnode() will use the descriptor for us */ 674 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 675 return (error); 676 mp = ((struct vnode *)fp->f_data)->v_mount; 677 sp = &mp->mnt_stat; 678 if ((error = VFS_STATFS(mp, sp, p)) != 0) 679 goto out; 680 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 681 sp->f_oflags = sp->f_flags & 0xffff; 682 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 683 out: 684 FILE_UNUSE(fp, p); 685 return (error); 686 } 687 688 /* 689 * Get statistics on all filesystems. 690 */ 691 int 692 sys_getfsstat(p, v, retval) 693 struct proc *p; 694 void *v; 695 register_t *retval; 696 { 697 struct sys_getfsstat_args /* { 698 syscallarg(struct statfs *) buf; 699 syscallarg(long) bufsize; 700 syscallarg(int) flags; 701 } */ *uap = v; 702 struct mount *mp, *nmp; 703 struct statfs *sp; 704 caddr_t sfsp; 705 long count, maxcount, error; 706 707 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 708 sfsp = (caddr_t)SCARG(uap, buf); 709 simple_lock(&mountlist_slock); 710 count = 0; 711 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 712 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 713 nmp = mp->mnt_list.cqe_next; 714 continue; 715 } 716 if (sfsp && count < maxcount) { 717 sp = &mp->mnt_stat; 718 /* 719 * If MNT_NOWAIT or MNT_LAZY is specified, do not 720 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 721 * overrides MNT_NOWAIT. 722 */ 723 if (SCARG(uap, flags) != MNT_NOWAIT && 724 SCARG(uap, flags) != MNT_LAZY && 725 (SCARG(uap, flags) == MNT_WAIT || 726 SCARG(uap, flags) == 0) && 727 (error = VFS_STATFS(mp, sp, p)) != 0) { 728 simple_lock(&mountlist_slock); 729 nmp = mp->mnt_list.cqe_next; 730 vfs_unbusy(mp); 731 continue; 732 } 733 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 734 sp->f_oflags = sp->f_flags & 0xffff; 735 error = copyout(sp, sfsp, sizeof(*sp)); 736 if (error) { 737 vfs_unbusy(mp); 738 return (error); 739 } 740 sfsp += sizeof(*sp); 741 } 742 count++; 743 simple_lock(&mountlist_slock); 744 nmp = mp->mnt_list.cqe_next; 745 vfs_unbusy(mp); 746 } 747 simple_unlock(&mountlist_slock); 748 if (sfsp && count > maxcount) 749 *retval = maxcount; 750 else 751 *retval = count; 752 return (0); 753 } 754 755 /* 756 * Change current working directory to a given file descriptor. 757 */ 758 /* ARGSUSED */ 759 int 760 sys_fchdir(p, v, retval) 761 struct proc *p; 762 void *v; 763 register_t *retval; 764 { 765 struct sys_fchdir_args /* { 766 syscallarg(int) fd; 767 } */ *uap = v; 768 struct filedesc *fdp = p->p_fd; 769 struct cwdinfo *cwdi = p->p_cwdi; 770 struct vnode *vp, *tdp; 771 struct mount *mp; 772 struct file *fp; 773 int error; 774 775 /* getvnode() will use the descriptor for us */ 776 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 777 return (error); 778 vp = (struct vnode *)fp->f_data; 779 780 VREF(vp); 781 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 782 if (vp->v_type != VDIR) 783 error = ENOTDIR; 784 else 785 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 786 while (!error && (mp = vp->v_mountedhere) != NULL) { 787 if (vfs_busy(mp, 0, 0)) 788 continue; 789 error = VFS_ROOT(mp, &tdp); 790 vfs_unbusy(mp); 791 if (error) 792 break; 793 vput(vp); 794 vp = tdp; 795 } 796 if (error) { 797 vput(vp); 798 goto out; 799 } 800 VOP_UNLOCK(vp, 0); 801 802 /* 803 * Disallow changing to a directory not under the process's 804 * current root directory (if there is one). 805 */ 806 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 807 vrele(vp); 808 error = EPERM; /* operation not permitted */ 809 goto out; 810 } 811 812 vrele(cwdi->cwdi_cdir); 813 cwdi->cwdi_cdir = vp; 814 out: 815 FILE_UNUSE(fp, p); 816 return (error); 817 } 818 819 /* 820 * Change this process's notion of the root directory to a given file descriptor. 821 */ 822 823 int 824 sys_fchroot(p, v, retval) 825 struct proc *p; 826 void *v; 827 register_t *retval; 828 { 829 struct sys_fchroot_args *uap = v; 830 struct filedesc *fdp = p->p_fd; 831 struct cwdinfo *cwdi = p->p_cwdi; 832 struct vnode *vp; 833 struct file *fp; 834 int error; 835 836 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 837 return error; 838 /* getvnode() will use the descriptor for us */ 839 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 840 return error; 841 vp = (struct vnode *) fp->f_data; 842 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 843 if (vp->v_type != VDIR) 844 error = ENOTDIR; 845 else 846 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 847 VOP_UNLOCK(vp, 0); 848 if (error) 849 goto out; 850 VREF(vp); 851 852 /* 853 * Prevent escaping from chroot by putting the root under 854 * the working directory. Silently chdir to / if we aren't 855 * already there. 856 */ 857 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 858 /* 859 * XXX would be more failsafe to change directory to a 860 * deadfs node here instead 861 */ 862 vrele(cwdi->cwdi_cdir); 863 VREF(vp); 864 cwdi->cwdi_cdir = vp; 865 } 866 867 if (cwdi->cwdi_rdir != NULL) 868 vrele(cwdi->cwdi_rdir); 869 cwdi->cwdi_rdir = vp; 870 out: 871 FILE_UNUSE(fp, p); 872 return (error); 873 } 874 875 876 877 /* 878 * Change current working directory (``.''). 879 */ 880 /* ARGSUSED */ 881 int 882 sys_chdir(p, v, retval) 883 struct proc *p; 884 void *v; 885 register_t *retval; 886 { 887 struct sys_chdir_args /* { 888 syscallarg(const char *) path; 889 } */ *uap = v; 890 struct cwdinfo *cwdi = p->p_cwdi; 891 int error; 892 struct nameidata nd; 893 894 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 895 SCARG(uap, path), p); 896 if ((error = change_dir(&nd, p)) != 0) 897 return (error); 898 vrele(cwdi->cwdi_cdir); 899 cwdi->cwdi_cdir = nd.ni_vp; 900 return (0); 901 } 902 903 /* 904 * Change notion of root (``/'') directory. 905 */ 906 /* ARGSUSED */ 907 int 908 sys_chroot(p, v, retval) 909 struct proc *p; 910 void *v; 911 register_t *retval; 912 { 913 struct sys_chroot_args /* { 914 syscallarg(const char *) path; 915 } */ *uap = v; 916 struct cwdinfo *cwdi = p->p_cwdi; 917 struct vnode *vp; 918 int error; 919 struct nameidata nd; 920 921 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 922 return (error); 923 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 924 SCARG(uap, path), p); 925 if ((error = change_dir(&nd, p)) != 0) 926 return (error); 927 if (cwdi->cwdi_rdir != NULL) 928 vrele(cwdi->cwdi_rdir); 929 vp = nd.ni_vp; 930 cwdi->cwdi_rdir = vp; 931 932 /* 933 * Prevent escaping from chroot by putting the root under 934 * the working directory. Silently chdir to / if we aren't 935 * already there. 936 */ 937 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 938 /* 939 * XXX would be more failsafe to change directory to a 940 * deadfs node here instead 941 */ 942 vrele(cwdi->cwdi_cdir); 943 VREF(vp); 944 cwdi->cwdi_cdir = vp; 945 } 946 947 return (0); 948 } 949 950 /* 951 * Common routine for chroot and chdir. 952 */ 953 static int 954 change_dir(ndp, p) 955 struct nameidata *ndp; 956 struct proc *p; 957 { 958 struct vnode *vp; 959 int error; 960 961 if ((error = namei(ndp)) != 0) 962 return (error); 963 vp = ndp->ni_vp; 964 if (vp->v_type != VDIR) 965 error = ENOTDIR; 966 else 967 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 968 969 if (error) 970 vput(vp); 971 else 972 VOP_UNLOCK(vp, 0); 973 return (error); 974 } 975 976 /* 977 * Check permissions, allocate an open file structure, 978 * and call the device open routine if any. 979 */ 980 int 981 sys_open(p, v, retval) 982 struct proc *p; 983 void *v; 984 register_t *retval; 985 { 986 struct sys_open_args /* { 987 syscallarg(const char *) path; 988 syscallarg(int) flags; 989 syscallarg(int) mode; 990 } */ *uap = v; 991 struct cwdinfo *cwdi = p->p_cwdi; 992 struct filedesc *fdp = p->p_fd; 993 struct file *fp; 994 struct vnode *vp; 995 int flags, cmode; 996 int type, indx, error; 997 struct flock lf; 998 struct nameidata nd; 999 1000 flags = FFLAGS(SCARG(uap, flags)); 1001 if ((flags & (FREAD | FWRITE)) == 0) 1002 return (EINVAL); 1003 /* falloc() will use the file descriptor for us */ 1004 if ((error = falloc(p, &fp, &indx)) != 0) 1005 return (error); 1006 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1007 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1008 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1009 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1010 FILE_UNUSE(fp, p); 1011 ffree(fp); 1012 if ((error == ENODEV || error == ENXIO) && 1013 p->p_dupfd >= 0 && /* XXX from fdopen */ 1014 (error = 1015 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1016 *retval = indx; 1017 return (0); 1018 } 1019 if (error == ERESTART) 1020 error = EINTR; 1021 fdremove(fdp, indx); 1022 return (error); 1023 } 1024 p->p_dupfd = 0; 1025 vp = nd.ni_vp; 1026 fp->f_flag = flags & FMASK; 1027 fp->f_type = DTYPE_VNODE; 1028 fp->f_ops = &vnops; 1029 fp->f_data = (caddr_t)vp; 1030 if (flags & (O_EXLOCK | O_SHLOCK)) { 1031 lf.l_whence = SEEK_SET; 1032 lf.l_start = 0; 1033 lf.l_len = 0; 1034 if (flags & O_EXLOCK) 1035 lf.l_type = F_WRLCK; 1036 else 1037 lf.l_type = F_RDLCK; 1038 type = F_FLOCK; 1039 if ((flags & FNONBLOCK) == 0) 1040 type |= F_WAIT; 1041 VOP_UNLOCK(vp, 0); 1042 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1043 if (error) { 1044 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1045 FILE_UNUSE(fp, p); 1046 ffree(fp); 1047 fdremove(fdp, indx); 1048 return (error); 1049 } 1050 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1051 fp->f_flag |= FHASLOCK; 1052 } 1053 VOP_UNLOCK(vp, 0); 1054 *retval = indx; 1055 FILE_UNUSE(fp, p); 1056 return (0); 1057 } 1058 1059 /* 1060 * Get file handle system call 1061 */ 1062 int 1063 sys_getfh(p, v, retval) 1064 struct proc *p; 1065 void *v; 1066 register_t *retval; 1067 { 1068 struct sys_getfh_args /* { 1069 syscallarg(char *) fname; 1070 syscallarg(fhandle_t *) fhp; 1071 } */ *uap = v; 1072 struct vnode *vp; 1073 fhandle_t fh; 1074 int error; 1075 struct nameidata nd; 1076 1077 /* 1078 * Must be super user 1079 */ 1080 error = suser(p->p_ucred, &p->p_acflag); 1081 if (error) 1082 return (error); 1083 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1084 SCARG(uap, fname), p); 1085 error = namei(&nd); 1086 if (error) 1087 return (error); 1088 vp = nd.ni_vp; 1089 memset((caddr_t)&fh, 0, sizeof(fh)); 1090 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1091 error = VFS_VPTOFH(vp, &fh.fh_fid); 1092 vput(vp); 1093 if (error) 1094 return (error); 1095 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1096 return (error); 1097 } 1098 1099 /* 1100 * Open a file given a file handle. 1101 * 1102 * Check permissions, allocate an open file structure, 1103 * and call the device open routine if any. 1104 */ 1105 int 1106 sys_fhopen(p, v, retval) 1107 struct proc *p; 1108 void *v; 1109 register_t *retval; 1110 { 1111 struct sys_fhopen_args /* { 1112 syscallarg(const fhandle_t *) fhp; 1113 syscallarg(int) flags; 1114 } */ *uap = v; 1115 struct filedesc *fdp = p->p_fd; 1116 struct file *fp; 1117 struct vnode *vp = NULL; 1118 struct mount *mp; 1119 struct ucred *cred = p->p_ucred; 1120 int flags; 1121 struct file *nfp; 1122 int type, indx, error=0; 1123 struct flock lf; 1124 struct vattr va; 1125 fhandle_t fh; 1126 1127 /* 1128 * Must be super user 1129 */ 1130 if ((error = suser(p->p_ucred, &p->p_acflag))) 1131 return (error); 1132 1133 flags = FFLAGS(SCARG(uap, flags)); 1134 if ((flags & (FREAD | FWRITE)) == 0) 1135 return (EINVAL); 1136 if ((flags & O_CREAT)) 1137 return (EINVAL); 1138 /* falloc() will use the file descriptor for us */ 1139 if ((error = falloc(p, &nfp, &indx)) != 0) 1140 return (error); 1141 fp = nfp; 1142 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1143 goto bad; 1144 1145 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1146 error = ESTALE; 1147 goto bad; 1148 } 1149 1150 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1151 vp = NULL; /* most likely unnecessary sanity for bad: */ 1152 goto bad; 1153 } 1154 1155 /* Now do an effective vn_open */ 1156 1157 if (vp->v_type == VSOCK) { 1158 error = EOPNOTSUPP; 1159 goto bad; 1160 } 1161 if (flags & FREAD) { 1162 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1163 goto bad; 1164 } 1165 if (flags & (FWRITE | O_TRUNC)) { 1166 if (vp->v_type == VDIR) { 1167 error = EISDIR; 1168 goto bad; 1169 } 1170 if ((error = vn_writechk(vp)) != 0 || 1171 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1172 goto bad; 1173 } 1174 if (flags & O_TRUNC) { 1175 VOP_UNLOCK(vp, 0); /* XXX */ 1176 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1177 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1178 VATTR_NULL(&va); 1179 va.va_size = 0; 1180 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1181 goto bad; 1182 } 1183 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1184 goto bad; 1185 if (flags & FWRITE) 1186 vp->v_writecount++; 1187 1188 /* done with modified vn_open, now finish what sys_open does. */ 1189 1190 fp->f_flag = flags & FMASK; 1191 fp->f_type = DTYPE_VNODE; 1192 fp->f_ops = &vnops; 1193 fp->f_data = (caddr_t)vp; 1194 if (flags & (O_EXLOCK | O_SHLOCK)) { 1195 lf.l_whence = SEEK_SET; 1196 lf.l_start = 0; 1197 lf.l_len = 0; 1198 if (flags & O_EXLOCK) 1199 lf.l_type = F_WRLCK; 1200 else 1201 lf.l_type = F_RDLCK; 1202 type = F_FLOCK; 1203 if ((flags & FNONBLOCK) == 0) 1204 type |= F_WAIT; 1205 VOP_UNLOCK(vp, 0); 1206 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1207 if (error) { 1208 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1209 FILE_UNUSE(fp, p); 1210 ffree(fp); 1211 fdremove(fdp, indx); 1212 return (error); 1213 } 1214 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1215 fp->f_flag |= FHASLOCK; 1216 } 1217 VOP_UNLOCK(vp, 0); 1218 *retval = indx; 1219 FILE_UNUSE(fp, p); 1220 return (0); 1221 1222 bad: 1223 FILE_UNUSE(fp, p); 1224 ffree(fp); 1225 fdremove(fdp, indx); 1226 if (vp != NULL) 1227 vput(vp); 1228 return (error); 1229 } 1230 1231 /* ARGSUSED */ 1232 int 1233 sys_fhstat(p, v, retval) 1234 struct proc *p; 1235 void *v; 1236 register_t *retval; 1237 { 1238 struct sys_fhstat_args /* { 1239 syscallarg(const fhandle_t *) fhp; 1240 syscallarg(struct stat *) sb; 1241 } */ *uap = v; 1242 struct stat sb; 1243 int error; 1244 fhandle_t fh; 1245 struct mount *mp; 1246 struct vnode *vp; 1247 1248 /* 1249 * Must be super user 1250 */ 1251 if ((error = suser(p->p_ucred, &p->p_acflag))) 1252 return (error); 1253 1254 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1255 return (error); 1256 1257 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1258 return (ESTALE); 1259 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1260 return (error); 1261 error = vn_stat(vp, &sb, p); 1262 vput(vp); 1263 if (error) 1264 return (error); 1265 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1266 return (error); 1267 } 1268 1269 /* ARGSUSED */ 1270 int 1271 sys_fhstatfs(p, v, retval) 1272 struct proc *p; 1273 void *v; 1274 register_t *retval; 1275 { 1276 struct sys_fhstatfs_args /* 1277 syscallarg(const fhandle_t *) fhp; 1278 syscallarg(struct statfs *) buf; 1279 } */ *uap = v; 1280 struct statfs sp; 1281 fhandle_t fh; 1282 struct mount *mp; 1283 struct vnode *vp; 1284 int error; 1285 1286 /* 1287 * Must be super user 1288 */ 1289 if ((error = suser(p->p_ucred, &p->p_acflag))) 1290 return (error); 1291 1292 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1293 return (error); 1294 1295 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1296 return (ESTALE); 1297 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1298 return (error); 1299 mp = vp->v_mount; 1300 vput(vp); 1301 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1302 return (error); 1303 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1304 sp.f_oflags = sp.f_flags & 0xffff; 1305 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1306 } 1307 1308 /* 1309 * Create a special file. 1310 */ 1311 /* ARGSUSED */ 1312 int 1313 sys_mknod(p, v, retval) 1314 struct proc *p; 1315 void *v; 1316 register_t *retval; 1317 { 1318 struct sys_mknod_args /* { 1319 syscallarg(const char *) path; 1320 syscallarg(int) mode; 1321 syscallarg(int) dev; 1322 } */ *uap = v; 1323 struct vnode *vp; 1324 struct vattr vattr; 1325 int error; 1326 int whiteout = 0; 1327 struct nameidata nd; 1328 1329 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1330 return (error); 1331 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1332 if ((error = namei(&nd)) != 0) 1333 return (error); 1334 vp = nd.ni_vp; 1335 if (vp != NULL) 1336 error = EEXIST; 1337 else { 1338 VATTR_NULL(&vattr); 1339 vattr.va_mode = 1340 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1341 vattr.va_rdev = SCARG(uap, dev); 1342 whiteout = 0; 1343 1344 switch (SCARG(uap, mode) & S_IFMT) { 1345 case S_IFMT: /* used by badsect to flag bad sectors */ 1346 vattr.va_type = VBAD; 1347 break; 1348 case S_IFCHR: 1349 vattr.va_type = VCHR; 1350 break; 1351 case S_IFBLK: 1352 vattr.va_type = VBLK; 1353 break; 1354 case S_IFWHT: 1355 whiteout = 1; 1356 break; 1357 default: 1358 error = EINVAL; 1359 break; 1360 } 1361 } 1362 if (!error) { 1363 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1364 if (whiteout) { 1365 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1366 if (error) 1367 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1368 vput(nd.ni_dvp); 1369 } else { 1370 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1371 &nd.ni_cnd, &vattr); 1372 } 1373 } else { 1374 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1375 if (nd.ni_dvp == vp) 1376 vrele(nd.ni_dvp); 1377 else 1378 vput(nd.ni_dvp); 1379 if (vp) 1380 vrele(vp); 1381 } 1382 return (error); 1383 } 1384 1385 /* 1386 * Create a named pipe. 1387 */ 1388 /* ARGSUSED */ 1389 int 1390 sys_mkfifo(p, v, retval) 1391 struct proc *p; 1392 void *v; 1393 register_t *retval; 1394 { 1395 struct sys_mkfifo_args /* { 1396 syscallarg(const char *) path; 1397 syscallarg(int) mode; 1398 } */ *uap = v; 1399 struct vattr vattr; 1400 int error; 1401 struct nameidata nd; 1402 1403 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1404 if ((error = namei(&nd)) != 0) 1405 return (error); 1406 if (nd.ni_vp != NULL) { 1407 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1408 if (nd.ni_dvp == nd.ni_vp) 1409 vrele(nd.ni_dvp); 1410 else 1411 vput(nd.ni_dvp); 1412 vrele(nd.ni_vp); 1413 return (EEXIST); 1414 } 1415 VATTR_NULL(&vattr); 1416 vattr.va_type = VFIFO; 1417 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1418 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1419 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1420 } 1421 1422 /* 1423 * Make a hard file link. 1424 */ 1425 /* ARGSUSED */ 1426 int 1427 sys_link(p, v, retval) 1428 struct proc *p; 1429 void *v; 1430 register_t *retval; 1431 { 1432 struct sys_link_args /* { 1433 syscallarg(const char *) path; 1434 syscallarg(const char *) link; 1435 } */ *uap = v; 1436 struct vnode *vp; 1437 struct nameidata nd; 1438 int error; 1439 1440 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1441 if ((error = namei(&nd)) != 0) 1442 return (error); 1443 vp = nd.ni_vp; 1444 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1445 if ((error = namei(&nd)) != 0) 1446 goto out; 1447 if (nd.ni_vp) { 1448 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1449 if (nd.ni_dvp == nd.ni_vp) 1450 vrele(nd.ni_dvp); 1451 else 1452 vput(nd.ni_dvp); 1453 vrele(nd.ni_vp); 1454 error = EEXIST; 1455 goto out; 1456 } 1457 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1458 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1459 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1460 out: 1461 vrele(vp); 1462 return (error); 1463 } 1464 1465 /* 1466 * Make a symbolic link. 1467 */ 1468 /* ARGSUSED */ 1469 int 1470 sys_symlink(p, v, retval) 1471 struct proc *p; 1472 void *v; 1473 register_t *retval; 1474 { 1475 struct sys_symlink_args /* { 1476 syscallarg(const char *) path; 1477 syscallarg(const char *) link; 1478 } */ *uap = v; 1479 struct vattr vattr; 1480 char *path; 1481 int error; 1482 struct nameidata nd; 1483 1484 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1485 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1486 if (error) 1487 goto out; 1488 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1489 if ((error = namei(&nd)) != 0) 1490 goto out; 1491 if (nd.ni_vp) { 1492 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1493 if (nd.ni_dvp == nd.ni_vp) 1494 vrele(nd.ni_dvp); 1495 else 1496 vput(nd.ni_dvp); 1497 vrele(nd.ni_vp); 1498 error = EEXIST; 1499 goto out; 1500 } 1501 VATTR_NULL(&vattr); 1502 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1503 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1504 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1505 out: 1506 FREE(path, M_NAMEI); 1507 return (error); 1508 } 1509 1510 /* 1511 * Delete a whiteout from the filesystem. 1512 */ 1513 /* ARGSUSED */ 1514 int 1515 sys_undelete(p, v, retval) 1516 struct proc *p; 1517 void *v; 1518 register_t *retval; 1519 { 1520 struct sys_undelete_args /* { 1521 syscallarg(const char *) path; 1522 } */ *uap = v; 1523 int error; 1524 struct nameidata nd; 1525 1526 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1527 SCARG(uap, path), p); 1528 error = namei(&nd); 1529 if (error) 1530 return (error); 1531 1532 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1533 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1534 if (nd.ni_dvp == nd.ni_vp) 1535 vrele(nd.ni_dvp); 1536 else 1537 vput(nd.ni_dvp); 1538 if (nd.ni_vp) 1539 vrele(nd.ni_vp); 1540 return (EEXIST); 1541 } 1542 1543 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1544 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1545 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1546 vput(nd.ni_dvp); 1547 return (error); 1548 } 1549 1550 /* 1551 * Delete a name from the filesystem. 1552 */ 1553 /* ARGSUSED */ 1554 int 1555 sys_unlink(p, v, retval) 1556 struct proc *p; 1557 void *v; 1558 register_t *retval; 1559 { 1560 struct sys_unlink_args /* { 1561 syscallarg(const char *) path; 1562 } */ *uap = v; 1563 struct vnode *vp; 1564 int error; 1565 struct nameidata nd; 1566 1567 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1568 SCARG(uap, path), p); 1569 if ((error = namei(&nd)) != 0) 1570 return (error); 1571 vp = nd.ni_vp; 1572 1573 /* 1574 * The root of a mounted filesystem cannot be deleted. 1575 */ 1576 if (vp->v_flag & VROOT) { 1577 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1578 if (nd.ni_dvp == vp) 1579 vrele(nd.ni_dvp); 1580 else 1581 vput(nd.ni_dvp); 1582 vput(vp); 1583 error = EBUSY; 1584 goto out; 1585 } 1586 1587 (void)uvm_vnp_uncache(vp); 1588 1589 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1590 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1591 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1592 out: 1593 return (error); 1594 } 1595 1596 /* 1597 * Reposition read/write file offset. 1598 */ 1599 int 1600 sys_lseek(p, v, retval) 1601 struct proc *p; 1602 void *v; 1603 register_t *retval; 1604 { 1605 struct sys_lseek_args /* { 1606 syscallarg(int) fd; 1607 syscallarg(int) pad; 1608 syscallarg(off_t) offset; 1609 syscallarg(int) whence; 1610 } */ *uap = v; 1611 struct ucred *cred = p->p_ucred; 1612 struct filedesc *fdp = p->p_fd; 1613 struct file *fp; 1614 struct vnode *vp; 1615 struct vattr vattr; 1616 off_t newoff; 1617 int error; 1618 1619 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1620 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1621 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1622 return (EBADF); 1623 1624 FILE_USE(fp); 1625 1626 vp = (struct vnode *)fp->f_data; 1627 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1628 error = ESPIPE; 1629 goto out; 1630 } 1631 1632 switch (SCARG(uap, whence)) { 1633 case SEEK_CUR: 1634 newoff = fp->f_offset + SCARG(uap, offset); 1635 break; 1636 case SEEK_END: 1637 error = VOP_GETATTR(vp, &vattr, cred, p); 1638 if (error) 1639 goto out; 1640 newoff = SCARG(uap, offset) + vattr.va_size; 1641 break; 1642 case SEEK_SET: 1643 newoff = SCARG(uap, offset); 1644 break; 1645 default: 1646 error = EINVAL; 1647 goto out; 1648 } 1649 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1650 goto out; 1651 1652 *(off_t *)retval = fp->f_offset = newoff; 1653 out: 1654 FILE_UNUSE(fp, p); 1655 return (error); 1656 } 1657 1658 /* 1659 * Positional read system call. 1660 */ 1661 int 1662 sys_pread(p, v, retval) 1663 struct proc *p; 1664 void *v; 1665 register_t *retval; 1666 { 1667 struct sys_pread_args /* { 1668 syscallarg(int) fd; 1669 syscallarg(void *) buf; 1670 syscallarg(size_t) nbyte; 1671 syscallarg(off_t) offset; 1672 } */ *uap = v; 1673 struct filedesc *fdp = p->p_fd; 1674 struct file *fp; 1675 struct vnode *vp; 1676 off_t offset; 1677 int error, fd = SCARG(uap, fd); 1678 1679 if ((u_int)fd >= fdp->fd_nfiles || 1680 (fp = fdp->fd_ofiles[fd]) == NULL || 1681 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1682 (fp->f_flag & FREAD) == 0) 1683 return (EBADF); 1684 1685 FILE_USE(fp); 1686 1687 vp = (struct vnode *)fp->f_data; 1688 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1689 error = ESPIPE; 1690 goto out; 1691 } 1692 1693 offset = SCARG(uap, offset); 1694 1695 /* 1696 * XXX This works because no file systems actually 1697 * XXX take any action on the seek operation. 1698 */ 1699 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1700 goto out; 1701 1702 /* dofileread() will unuse the descriptor for us */ 1703 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1704 &offset, 0, retval)); 1705 1706 out: 1707 FILE_UNUSE(fp, p); 1708 return (error); 1709 } 1710 1711 /* 1712 * Positional scatter read system call. 1713 */ 1714 int 1715 sys_preadv(p, v, retval) 1716 struct proc *p; 1717 void *v; 1718 register_t *retval; 1719 { 1720 struct sys_preadv_args /* { 1721 syscallarg(int) fd; 1722 syscallarg(const struct iovec *) iovp; 1723 syscallarg(int) iovcnt; 1724 syscallarg(off_t) offset; 1725 } */ *uap = v; 1726 struct filedesc *fdp = p->p_fd; 1727 struct file *fp; 1728 struct vnode *vp; 1729 off_t offset; 1730 int error, fd = SCARG(uap, fd); 1731 1732 if ((u_int)fd >= fdp->fd_nfiles || 1733 (fp = fdp->fd_ofiles[fd]) == NULL || 1734 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1735 (fp->f_flag & FREAD) == 0) 1736 return (EBADF); 1737 1738 FILE_USE(fp); 1739 1740 vp = (struct vnode *)fp->f_data; 1741 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1742 error = ESPIPE; 1743 goto out; 1744 } 1745 1746 offset = SCARG(uap, offset); 1747 1748 /* 1749 * XXX This works because no file systems actually 1750 * XXX take any action on the seek operation. 1751 */ 1752 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1753 goto out; 1754 1755 /* dofilereadv() will unuse the descriptor for us */ 1756 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1757 &offset, 0, retval)); 1758 1759 out: 1760 FILE_UNUSE(fp, p); 1761 return (error); 1762 } 1763 1764 /* 1765 * Positional write system call. 1766 */ 1767 int 1768 sys_pwrite(p, v, retval) 1769 struct proc *p; 1770 void *v; 1771 register_t *retval; 1772 { 1773 struct sys_pwrite_args /* { 1774 syscallarg(int) fd; 1775 syscallarg(const void *) buf; 1776 syscallarg(size_t) nbyte; 1777 syscallarg(off_t) offset; 1778 } */ *uap = v; 1779 struct filedesc *fdp = p->p_fd; 1780 struct file *fp; 1781 struct vnode *vp; 1782 off_t offset; 1783 int error, fd = SCARG(uap, fd); 1784 1785 if ((u_int)fd >= fdp->fd_nfiles || 1786 (fp = fdp->fd_ofiles[fd]) == NULL || 1787 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1788 (fp->f_flag & FWRITE) == 0) 1789 return (EBADF); 1790 1791 FILE_USE(fp); 1792 1793 vp = (struct vnode *)fp->f_data; 1794 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1795 error = ESPIPE; 1796 goto out; 1797 } 1798 1799 offset = SCARG(uap, offset); 1800 1801 /* 1802 * XXX This works because no file systems actually 1803 * XXX take any action on the seek operation. 1804 */ 1805 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1806 goto out; 1807 1808 /* dofilewrite() will unuse the descriptor for us */ 1809 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1810 &offset, 0, retval)); 1811 1812 out: 1813 FILE_UNUSE(fp, p); 1814 return (error); 1815 } 1816 1817 /* 1818 * Positional gather write system call. 1819 */ 1820 int 1821 sys_pwritev(p, v, retval) 1822 struct proc *p; 1823 void *v; 1824 register_t *retval; 1825 { 1826 struct sys_pwritev_args /* { 1827 syscallarg(int) fd; 1828 syscallarg(const struct iovec *) iovp; 1829 syscallarg(int) iovcnt; 1830 syscallarg(off_t) offset; 1831 } */ *uap = v; 1832 struct filedesc *fdp = p->p_fd; 1833 struct file *fp; 1834 struct vnode *vp; 1835 off_t offset; 1836 int error, fd = SCARG(uap, fd); 1837 1838 if ((u_int)fd >= fdp->fd_nfiles || 1839 (fp = fdp->fd_ofiles[fd]) == NULL || 1840 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1841 (fp->f_flag & FWRITE) == 0) 1842 return (EBADF); 1843 1844 FILE_USE(fp); 1845 1846 vp = (struct vnode *)fp->f_data; 1847 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1848 error = ESPIPE; 1849 goto out; 1850 } 1851 1852 offset = SCARG(uap, offset); 1853 1854 /* 1855 * XXX This works because no file systems actually 1856 * XXX take any action on the seek operation. 1857 */ 1858 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1859 goto out; 1860 1861 /* dofilewritev() will unuse the descriptor for us */ 1862 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1863 &offset, 0, retval)); 1864 1865 out: 1866 FILE_UNUSE(fp, p); 1867 return (error); 1868 } 1869 1870 /* 1871 * Check access permissions. 1872 */ 1873 int 1874 sys_access(p, v, retval) 1875 struct proc *p; 1876 void *v; 1877 register_t *retval; 1878 { 1879 struct sys_access_args /* { 1880 syscallarg(const char *) path; 1881 syscallarg(int) flags; 1882 } */ *uap = v; 1883 struct ucred *cred = p->p_ucred; 1884 struct vnode *vp; 1885 int error, flags, t_gid, t_uid; 1886 struct nameidata nd; 1887 1888 t_uid = cred->cr_uid; 1889 t_gid = cred->cr_gid; 1890 cred->cr_uid = p->p_cred->p_ruid; 1891 cred->cr_gid = p->p_cred->p_rgid; 1892 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1893 SCARG(uap, path), p); 1894 if ((error = namei(&nd)) != 0) 1895 goto out1; 1896 vp = nd.ni_vp; 1897 1898 /* Flags == 0 means only check for existence. */ 1899 if (SCARG(uap, flags)) { 1900 flags = 0; 1901 if (SCARG(uap, flags) & R_OK) 1902 flags |= VREAD; 1903 if (SCARG(uap, flags) & W_OK) 1904 flags |= VWRITE; 1905 if (SCARG(uap, flags) & X_OK) 1906 flags |= VEXEC; 1907 1908 error = VOP_ACCESS(vp, flags, cred, p); 1909 if (!error && (flags & VWRITE)) 1910 error = vn_writechk(vp); 1911 } 1912 vput(vp); 1913 out1: 1914 cred->cr_uid = t_uid; 1915 cred->cr_gid = t_gid; 1916 return (error); 1917 } 1918 1919 /* 1920 * Get file status; this version follows links. 1921 */ 1922 /* ARGSUSED */ 1923 int 1924 sys___stat13(p, v, retval) 1925 struct proc *p; 1926 void *v; 1927 register_t *retval; 1928 { 1929 struct sys___stat13_args /* { 1930 syscallarg(const char *) path; 1931 syscallarg(struct stat *) ub; 1932 } */ *uap = v; 1933 struct stat sb; 1934 int error; 1935 struct nameidata nd; 1936 1937 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1938 SCARG(uap, path), p); 1939 if ((error = namei(&nd)) != 0) 1940 return (error); 1941 error = vn_stat(nd.ni_vp, &sb, p); 1942 vput(nd.ni_vp); 1943 if (error) 1944 return (error); 1945 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1946 return (error); 1947 } 1948 1949 /* 1950 * Get file status; this version does not follow links. 1951 */ 1952 /* ARGSUSED */ 1953 int 1954 sys___lstat13(p, v, retval) 1955 struct proc *p; 1956 void *v; 1957 register_t *retval; 1958 { 1959 struct sys___lstat13_args /* { 1960 syscallarg(const char *) path; 1961 syscallarg(struct stat *) ub; 1962 } */ *uap = v; 1963 struct stat sb; 1964 int error; 1965 struct nameidata nd; 1966 1967 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1968 SCARG(uap, path), p); 1969 if ((error = namei(&nd)) != 0) 1970 return (error); 1971 error = vn_stat(nd.ni_vp, &sb, p); 1972 vput(nd.ni_vp); 1973 if (error) 1974 return (error); 1975 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1976 return (error); 1977 } 1978 1979 /* 1980 * Get configurable pathname variables. 1981 */ 1982 /* ARGSUSED */ 1983 int 1984 sys_pathconf(p, v, retval) 1985 struct proc *p; 1986 void *v; 1987 register_t *retval; 1988 { 1989 struct sys_pathconf_args /* { 1990 syscallarg(const char *) path; 1991 syscallarg(int) name; 1992 } */ *uap = v; 1993 int error; 1994 struct nameidata nd; 1995 1996 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1997 SCARG(uap, path), p); 1998 if ((error = namei(&nd)) != 0) 1999 return (error); 2000 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2001 vput(nd.ni_vp); 2002 return (error); 2003 } 2004 2005 /* 2006 * Return target name of a symbolic link. 2007 */ 2008 /* ARGSUSED */ 2009 int 2010 sys_readlink(p, v, retval) 2011 struct proc *p; 2012 void *v; 2013 register_t *retval; 2014 { 2015 struct sys_readlink_args /* { 2016 syscallarg(const char *) path; 2017 syscallarg(char *) buf; 2018 syscallarg(size_t) count; 2019 } */ *uap = v; 2020 struct vnode *vp; 2021 struct iovec aiov; 2022 struct uio auio; 2023 int error; 2024 struct nameidata nd; 2025 2026 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2027 SCARG(uap, path), p); 2028 if ((error = namei(&nd)) != 0) 2029 return (error); 2030 vp = nd.ni_vp; 2031 if (vp->v_type != VLNK) 2032 error = EINVAL; 2033 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2034 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2035 aiov.iov_base = SCARG(uap, buf); 2036 aiov.iov_len = SCARG(uap, count); 2037 auio.uio_iov = &aiov; 2038 auio.uio_iovcnt = 1; 2039 auio.uio_offset = 0; 2040 auio.uio_rw = UIO_READ; 2041 auio.uio_segflg = UIO_USERSPACE; 2042 auio.uio_procp = p; 2043 auio.uio_resid = SCARG(uap, count); 2044 error = VOP_READLINK(vp, &auio, p->p_ucred); 2045 } 2046 vput(vp); 2047 *retval = SCARG(uap, count) - auio.uio_resid; 2048 return (error); 2049 } 2050 2051 /* 2052 * Change flags of a file given a path name. 2053 */ 2054 /* ARGSUSED */ 2055 int 2056 sys_chflags(p, v, retval) 2057 struct proc *p; 2058 void *v; 2059 register_t *retval; 2060 { 2061 struct sys_chflags_args /* { 2062 syscallarg(const char *) path; 2063 syscallarg(u_long) flags; 2064 } */ *uap = v; 2065 struct vnode *vp; 2066 struct vattr vattr; 2067 int error; 2068 struct nameidata nd; 2069 2070 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2071 if ((error = namei(&nd)) != 0) 2072 return (error); 2073 vp = nd.ni_vp; 2074 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2075 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2076 /* Non-superusers cannot change the flags on devices, even if they 2077 own them. */ 2078 if (suser(p->p_ucred, &p->p_acflag)) { 2079 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2080 goto out; 2081 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2082 error = EINVAL; 2083 goto out; 2084 } 2085 } 2086 VATTR_NULL(&vattr); 2087 vattr.va_flags = SCARG(uap, flags); 2088 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2089 out: 2090 vput(vp); 2091 return (error); 2092 } 2093 2094 /* 2095 * Change flags of a file given a file descriptor. 2096 */ 2097 /* ARGSUSED */ 2098 int 2099 sys_fchflags(p, v, retval) 2100 struct proc *p; 2101 void *v; 2102 register_t *retval; 2103 { 2104 struct sys_fchflags_args /* { 2105 syscallarg(int) fd; 2106 syscallarg(u_long) flags; 2107 } */ *uap = v; 2108 struct vattr vattr; 2109 struct vnode *vp; 2110 struct file *fp; 2111 int error; 2112 2113 /* getvnode() will use the descriptor for us */ 2114 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2115 return (error); 2116 vp = (struct vnode *)fp->f_data; 2117 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2118 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2119 /* Non-superusers cannot change the flags on devices, even if they 2120 own them. */ 2121 if (suser(p->p_ucred, &p->p_acflag)) { 2122 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2123 != 0) 2124 goto out; 2125 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2126 error = EINVAL; 2127 goto out; 2128 } 2129 } 2130 VATTR_NULL(&vattr); 2131 vattr.va_flags = SCARG(uap, flags); 2132 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2133 out: 2134 VOP_UNLOCK(vp, 0); 2135 FILE_UNUSE(fp, p); 2136 return (error); 2137 } 2138 2139 /* 2140 * Change flags of a file given a file descriptor; this version does 2141 * not follow links. 2142 */ 2143 int 2144 sys_lchflags(p, v, retval) 2145 struct proc *p; 2146 void *v; 2147 register_t *retval; 2148 { 2149 register struct sys_chflags_args /* { 2150 syscallarg(const char *) path; 2151 syscallarg(u_long) flags; 2152 } */ *uap = v; 2153 register struct vnode *vp; 2154 struct vattr vattr; 2155 int error; 2156 struct nameidata nd; 2157 2158 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2159 if ((error = namei(&nd)) != 0) 2160 return (error); 2161 vp = nd.ni_vp; 2162 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2163 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2164 /* Non-superusers cannot change the flags on devices, even if they 2165 own them. */ 2166 if (suser(p->p_ucred, &p->p_acflag)) { 2167 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2168 goto out; 2169 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2170 error = EINVAL; 2171 goto out; 2172 } 2173 } 2174 VATTR_NULL(&vattr); 2175 vattr.va_flags = SCARG(uap, flags); 2176 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2177 out: 2178 vput(vp); 2179 return (error); 2180 } 2181 2182 /* 2183 * Change mode of a file given path name; this version follows links. 2184 */ 2185 /* ARGSUSED */ 2186 int 2187 sys_chmod(p, v, retval) 2188 struct proc *p; 2189 void *v; 2190 register_t *retval; 2191 { 2192 struct sys_chmod_args /* { 2193 syscallarg(const char *) path; 2194 syscallarg(int) mode; 2195 } */ *uap = v; 2196 int error; 2197 struct nameidata nd; 2198 2199 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2200 if ((error = namei(&nd)) != 0) 2201 return (error); 2202 2203 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2204 2205 vrele(nd.ni_vp); 2206 return (error); 2207 } 2208 2209 /* 2210 * Change mode of a file given a file descriptor. 2211 */ 2212 /* ARGSUSED */ 2213 int 2214 sys_fchmod(p, v, retval) 2215 struct proc *p; 2216 void *v; 2217 register_t *retval; 2218 { 2219 struct sys_fchmod_args /* { 2220 syscallarg(int) fd; 2221 syscallarg(int) mode; 2222 } */ *uap = v; 2223 struct file *fp; 2224 int error; 2225 2226 /* getvnode() will use the descriptor for us */ 2227 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2228 return (error); 2229 2230 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2231 FILE_UNUSE(fp, p); 2232 return (error); 2233 } 2234 2235 /* 2236 * Change mode of a file given path name; this version does not follow links. 2237 */ 2238 /* ARGSUSED */ 2239 int 2240 sys_lchmod(p, v, retval) 2241 struct proc *p; 2242 void *v; 2243 register_t *retval; 2244 { 2245 struct sys_lchmod_args /* { 2246 syscallarg(const char *) path; 2247 syscallarg(int) mode; 2248 } */ *uap = v; 2249 int error; 2250 struct nameidata nd; 2251 2252 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2253 if ((error = namei(&nd)) != 0) 2254 return (error); 2255 2256 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2257 2258 vrele(nd.ni_vp); 2259 return (error); 2260 } 2261 2262 /* 2263 * Common routine to set mode given a vnode. 2264 */ 2265 static int 2266 change_mode(vp, mode, p) 2267 struct vnode *vp; 2268 int mode; 2269 struct proc *p; 2270 { 2271 struct vattr vattr; 2272 int error; 2273 2274 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2275 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2276 VATTR_NULL(&vattr); 2277 vattr.va_mode = mode & ALLPERMS; 2278 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2279 VOP_UNLOCK(vp, 0); 2280 return (error); 2281 } 2282 2283 /* 2284 * Set ownership given a path name; this version follows links. 2285 */ 2286 /* ARGSUSED */ 2287 int 2288 sys_chown(p, v, retval) 2289 struct proc *p; 2290 void *v; 2291 register_t *retval; 2292 { 2293 struct sys_chown_args /* { 2294 syscallarg(const char *) path; 2295 syscallarg(uid_t) uid; 2296 syscallarg(gid_t) gid; 2297 } */ *uap = v; 2298 int error; 2299 struct nameidata nd; 2300 2301 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2302 if ((error = namei(&nd)) != 0) 2303 return (error); 2304 2305 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2306 2307 vrele(nd.ni_vp); 2308 return (error); 2309 } 2310 2311 /* 2312 * Set ownership given a path name; this version follows links. 2313 * Provides POSIX semantics. 2314 */ 2315 /* ARGSUSED */ 2316 int 2317 sys___posix_chown(p, v, retval) 2318 struct proc *p; 2319 void *v; 2320 register_t *retval; 2321 { 2322 struct sys_chown_args /* { 2323 syscallarg(const char *) path; 2324 syscallarg(uid_t) uid; 2325 syscallarg(gid_t) gid; 2326 } */ *uap = v; 2327 int error; 2328 struct nameidata nd; 2329 2330 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2331 if ((error = namei(&nd)) != 0) 2332 return (error); 2333 2334 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2335 2336 vrele(nd.ni_vp); 2337 return (error); 2338 } 2339 2340 /* 2341 * Set ownership given a file descriptor. 2342 */ 2343 /* ARGSUSED */ 2344 int 2345 sys_fchown(p, v, retval) 2346 struct proc *p; 2347 void *v; 2348 register_t *retval; 2349 { 2350 struct sys_fchown_args /* { 2351 syscallarg(int) fd; 2352 syscallarg(uid_t) uid; 2353 syscallarg(gid_t) gid; 2354 } */ *uap = v; 2355 int error; 2356 struct file *fp; 2357 2358 /* getvnode() will use the descriptor for us */ 2359 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2360 return (error); 2361 2362 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2363 SCARG(uap, gid), p, 0); 2364 FILE_UNUSE(fp, p); 2365 return (error); 2366 } 2367 2368 /* 2369 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2370 */ 2371 /* ARGSUSED */ 2372 int 2373 sys___posix_fchown(p, v, retval) 2374 struct proc *p; 2375 void *v; 2376 register_t *retval; 2377 { 2378 struct sys_fchown_args /* { 2379 syscallarg(int) fd; 2380 syscallarg(uid_t) uid; 2381 syscallarg(gid_t) gid; 2382 } */ *uap = v; 2383 int error; 2384 struct file *fp; 2385 2386 /* getvnode() will use the descriptor for us */ 2387 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2388 return (error); 2389 2390 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2391 SCARG(uap, gid), p, 1); 2392 FILE_UNUSE(fp, p); 2393 return (error); 2394 } 2395 2396 /* 2397 * Set ownership given a path name; this version does not follow links. 2398 */ 2399 /* ARGSUSED */ 2400 int 2401 sys_lchown(p, v, retval) 2402 struct proc *p; 2403 void *v; 2404 register_t *retval; 2405 { 2406 struct sys_lchown_args /* { 2407 syscallarg(const char *) path; 2408 syscallarg(uid_t) uid; 2409 syscallarg(gid_t) gid; 2410 } */ *uap = v; 2411 int error; 2412 struct nameidata nd; 2413 2414 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2415 if ((error = namei(&nd)) != 0) 2416 return (error); 2417 2418 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2419 2420 vrele(nd.ni_vp); 2421 return (error); 2422 } 2423 2424 /* 2425 * Set ownership given a path name; this version does not follow links. 2426 * Provides POSIX/XPG semantics. 2427 */ 2428 /* ARGSUSED */ 2429 int 2430 sys___posix_lchown(p, v, retval) 2431 struct proc *p; 2432 void *v; 2433 register_t *retval; 2434 { 2435 struct sys_lchown_args /* { 2436 syscallarg(const char *) path; 2437 syscallarg(uid_t) uid; 2438 syscallarg(gid_t) gid; 2439 } */ *uap = v; 2440 int error; 2441 struct nameidata nd; 2442 2443 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2444 if ((error = namei(&nd)) != 0) 2445 return (error); 2446 2447 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2448 2449 vrele(nd.ni_vp); 2450 return (error); 2451 } 2452 2453 /* 2454 * Common routine to set ownership given a vnode. 2455 */ 2456 static int 2457 change_owner(vp, uid, gid, p, posix_semantics) 2458 struct vnode *vp; 2459 uid_t uid; 2460 gid_t gid; 2461 struct proc *p; 2462 int posix_semantics; 2463 { 2464 struct vattr vattr; 2465 mode_t newmode; 2466 int error; 2467 2468 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2469 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2470 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2471 goto out; 2472 2473 #define CHANGED(x) ((x) != -1) 2474 newmode = vattr.va_mode; 2475 if (posix_semantics) { 2476 /* 2477 * POSIX/XPG semantics: if the caller is not the super-user, 2478 * clear set-user-id and set-group-id bits. Both POSIX and 2479 * the XPG consider the behaviour for calls by the super-user 2480 * implementation-defined; we leave the set-user-id and set- 2481 * group-id settings intact in that case. 2482 */ 2483 if (suser(p->p_ucred, NULL) != 0) 2484 newmode &= ~(S_ISUID | S_ISGID); 2485 } else { 2486 /* 2487 * NetBSD semantics: when changing owner and/or group, 2488 * clear the respective bit(s). 2489 */ 2490 if (CHANGED(uid)) 2491 newmode &= ~S_ISUID; 2492 if (CHANGED(gid)) 2493 newmode &= ~S_ISGID; 2494 } 2495 /* Update va_mode iff altered. */ 2496 if (vattr.va_mode == newmode) 2497 newmode = VNOVAL; 2498 2499 VATTR_NULL(&vattr); 2500 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2501 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2502 vattr.va_mode = newmode; 2503 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2504 #undef CHANGED 2505 2506 out: 2507 VOP_UNLOCK(vp, 0); 2508 return (error); 2509 } 2510 2511 /* 2512 * Set the access and modification times given a path name; this 2513 * version follows links. 2514 */ 2515 /* ARGSUSED */ 2516 int 2517 sys_utimes(p, v, retval) 2518 struct proc *p; 2519 void *v; 2520 register_t *retval; 2521 { 2522 struct sys_utimes_args /* { 2523 syscallarg(const char *) path; 2524 syscallarg(const struct timeval *) tptr; 2525 } */ *uap = v; 2526 int error; 2527 struct nameidata nd; 2528 2529 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2530 if ((error = namei(&nd)) != 0) 2531 return (error); 2532 2533 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2534 2535 vrele(nd.ni_vp); 2536 return (error); 2537 } 2538 2539 /* 2540 * Set the access and modification times given a file descriptor. 2541 */ 2542 /* ARGSUSED */ 2543 int 2544 sys_futimes(p, v, retval) 2545 struct proc *p; 2546 void *v; 2547 register_t *retval; 2548 { 2549 struct sys_futimes_args /* { 2550 syscallarg(int) fd; 2551 syscallarg(const struct timeval *) tptr; 2552 } */ *uap = v; 2553 int error; 2554 struct file *fp; 2555 2556 /* getvnode() will use the descriptor for us */ 2557 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2558 return (error); 2559 2560 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2561 FILE_UNUSE(fp, p); 2562 return (error); 2563 } 2564 2565 /* 2566 * Set the access and modification times given a path name; this 2567 * version does not follow links. 2568 */ 2569 /* ARGSUSED */ 2570 int 2571 sys_lutimes(p, v, retval) 2572 struct proc *p; 2573 void *v; 2574 register_t *retval; 2575 { 2576 struct sys_lutimes_args /* { 2577 syscallarg(const char *) path; 2578 syscallarg(const struct timeval *) tptr; 2579 } */ *uap = v; 2580 int error; 2581 struct nameidata nd; 2582 2583 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2584 if ((error = namei(&nd)) != 0) 2585 return (error); 2586 2587 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2588 2589 vrele(nd.ni_vp); 2590 return (error); 2591 } 2592 2593 /* 2594 * Common routine to set access and modification times given a vnode. 2595 */ 2596 static int 2597 change_utimes(vp, tptr, p) 2598 struct vnode *vp; 2599 const struct timeval *tptr; 2600 struct proc *p; 2601 { 2602 struct timeval tv[2]; 2603 struct vattr vattr; 2604 int error; 2605 2606 VATTR_NULL(&vattr); 2607 if (tptr == NULL) { 2608 microtime(&tv[0]); 2609 tv[1] = tv[0]; 2610 vattr.va_vaflags |= VA_UTIMES_NULL; 2611 } else { 2612 error = copyin(tptr, tv, sizeof(tv)); 2613 if (error) 2614 return (error); 2615 } 2616 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2617 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2618 vattr.va_atime.tv_sec = tv[0].tv_sec; 2619 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2620 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2621 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2622 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2623 VOP_UNLOCK(vp, 0); 2624 return (error); 2625 } 2626 2627 /* 2628 * Truncate a file given its path name. 2629 */ 2630 /* ARGSUSED */ 2631 int 2632 sys_truncate(p, v, retval) 2633 struct proc *p; 2634 void *v; 2635 register_t *retval; 2636 { 2637 struct sys_truncate_args /* { 2638 syscallarg(const char *) path; 2639 syscallarg(int) pad; 2640 syscallarg(off_t) length; 2641 } */ *uap = v; 2642 struct vnode *vp; 2643 struct vattr vattr; 2644 int error; 2645 struct nameidata nd; 2646 2647 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2648 if ((error = namei(&nd)) != 0) 2649 return (error); 2650 vp = nd.ni_vp; 2651 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2652 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2653 if (vp->v_type == VDIR) 2654 error = EISDIR; 2655 else if ((error = vn_writechk(vp)) == 0 && 2656 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2657 VATTR_NULL(&vattr); 2658 vattr.va_size = SCARG(uap, length); 2659 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2660 } 2661 vput(vp); 2662 return (error); 2663 } 2664 2665 /* 2666 * Truncate a file given a file descriptor. 2667 */ 2668 /* ARGSUSED */ 2669 int 2670 sys_ftruncate(p, v, retval) 2671 struct proc *p; 2672 void *v; 2673 register_t *retval; 2674 { 2675 struct sys_ftruncate_args /* { 2676 syscallarg(int) fd; 2677 syscallarg(int) pad; 2678 syscallarg(off_t) length; 2679 } */ *uap = v; 2680 struct vattr vattr; 2681 struct vnode *vp; 2682 struct file *fp; 2683 int error; 2684 2685 /* getvnode() will use the descriptor for us */ 2686 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2687 return (error); 2688 if ((fp->f_flag & FWRITE) == 0) { 2689 error = EINVAL; 2690 goto out; 2691 } 2692 vp = (struct vnode *)fp->f_data; 2693 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2694 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2695 if (vp->v_type == VDIR) 2696 error = EISDIR; 2697 else if ((error = vn_writechk(vp)) == 0) { 2698 VATTR_NULL(&vattr); 2699 vattr.va_size = SCARG(uap, length); 2700 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2701 } 2702 VOP_UNLOCK(vp, 0); 2703 out: 2704 FILE_UNUSE(fp, p); 2705 return (error); 2706 } 2707 2708 /* 2709 * Sync an open file. 2710 */ 2711 /* ARGSUSED */ 2712 int 2713 sys_fsync(p, v, retval) 2714 struct proc *p; 2715 void *v; 2716 register_t *retval; 2717 { 2718 struct sys_fsync_args /* { 2719 syscallarg(int) fd; 2720 } */ *uap = v; 2721 struct vnode *vp; 2722 struct file *fp; 2723 int error; 2724 2725 /* getvnode() will use the descriptor for us */ 2726 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2727 return (error); 2728 vp = (struct vnode *)fp->f_data; 2729 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2730 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2731 if (error == 0 && bioops.io_fsync != NULL && 2732 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2733 (*bioops.io_fsync)(vp); 2734 VOP_UNLOCK(vp, 0); 2735 FILE_UNUSE(fp, p); 2736 return (error); 2737 } 2738 2739 /* 2740 * Sync the data of an open file. 2741 */ 2742 /* ARGSUSED */ 2743 int 2744 sys_fdatasync(p, v, retval) 2745 struct proc *p; 2746 void *v; 2747 register_t *retval; 2748 { 2749 struct sys_fdatasync_args /* { 2750 syscallarg(int) fd; 2751 } */ *uap = v; 2752 struct vnode *vp; 2753 struct file *fp; 2754 int error; 2755 2756 /* getvnode() will use the descriptor for us */ 2757 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2758 return (error); 2759 vp = (struct vnode *)fp->f_data; 2760 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2761 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2762 VOP_UNLOCK(vp, 0); 2763 FILE_UNUSE(fp, p); 2764 return (error); 2765 } 2766 2767 /* 2768 * Rename files, (standard) BSD semantics frontend. 2769 */ 2770 /* ARGSUSED */ 2771 int 2772 sys_rename(p, v, retval) 2773 struct proc *p; 2774 void *v; 2775 register_t *retval; 2776 { 2777 struct sys_rename_args /* { 2778 syscallarg(const char *) from; 2779 syscallarg(const char *) to; 2780 } */ *uap = v; 2781 2782 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2783 } 2784 2785 /* 2786 * Rename files, POSIX semantics frontend. 2787 */ 2788 /* ARGSUSED */ 2789 int 2790 sys___posix_rename(p, v, retval) 2791 struct proc *p; 2792 void *v; 2793 register_t *retval; 2794 { 2795 struct sys___posix_rename_args /* { 2796 syscallarg(const char *) from; 2797 syscallarg(const char *) to; 2798 } */ *uap = v; 2799 2800 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2801 } 2802 2803 /* 2804 * Rename files. Source and destination must either both be directories, 2805 * or both not be directories. If target is a directory, it must be empty. 2806 * If `from' and `to' refer to the same object, the value of the `retain' 2807 * argument is used to determine whether `from' will be 2808 * 2809 * (retain == 0) deleted unless `from' and `to' refer to the same 2810 * object in the file system's name space (BSD). 2811 * (retain == 1) always retained (POSIX). 2812 */ 2813 static int 2814 rename_files(from, to, p, retain) 2815 const char *from, *to; 2816 struct proc *p; 2817 int retain; 2818 { 2819 struct vnode *tvp, *fvp, *tdvp; 2820 struct nameidata fromnd, tond; 2821 int error; 2822 2823 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2824 from, p); 2825 if ((error = namei(&fromnd)) != 0) 2826 return (error); 2827 fvp = fromnd.ni_vp; 2828 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2829 UIO_USERSPACE, to, p); 2830 if ((error = namei(&tond)) != 0) { 2831 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2832 vrele(fromnd.ni_dvp); 2833 vrele(fvp); 2834 goto out1; 2835 } 2836 tdvp = tond.ni_dvp; 2837 tvp = tond.ni_vp; 2838 2839 if (tvp != NULL) { 2840 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2841 error = ENOTDIR; 2842 goto out; 2843 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2844 error = EISDIR; 2845 goto out; 2846 } 2847 } 2848 2849 if (fvp == tdvp) 2850 error = EINVAL; 2851 2852 /* 2853 * Source and destination refer to the same object. 2854 */ 2855 if (fvp == tvp) { 2856 if (retain) 2857 error = -1; 2858 else if (fromnd.ni_dvp == tdvp && 2859 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2860 !memcmp(fromnd.ni_cnd.cn_nameptr, 2861 tond.ni_cnd.cn_nameptr, 2862 fromnd.ni_cnd.cn_namelen)) 2863 error = -1; 2864 } 2865 2866 out: 2867 if (!error) { 2868 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2869 if (fromnd.ni_dvp != tdvp) 2870 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2871 if (tvp) { 2872 (void)uvm_vnp_uncache(tvp); 2873 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2874 } 2875 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2876 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2877 } else { 2878 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2879 if (tdvp == tvp) 2880 vrele(tdvp); 2881 else 2882 vput(tdvp); 2883 if (tvp) 2884 vput(tvp); 2885 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2886 vrele(fromnd.ni_dvp); 2887 vrele(fvp); 2888 } 2889 vrele(tond.ni_startdir); 2890 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2891 out1: 2892 if (fromnd.ni_startdir) 2893 vrele(fromnd.ni_startdir); 2894 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2895 return (error == -1 ? 0 : error); 2896 } 2897 2898 /* 2899 * Make a directory file. 2900 */ 2901 /* ARGSUSED */ 2902 int 2903 sys_mkdir(p, v, retval) 2904 struct proc *p; 2905 void *v; 2906 register_t *retval; 2907 { 2908 struct sys_mkdir_args /* { 2909 syscallarg(const char *) path; 2910 syscallarg(int) mode; 2911 } */ *uap = v; 2912 struct vnode *vp; 2913 struct vattr vattr; 2914 int error; 2915 struct nameidata nd; 2916 2917 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2918 if ((error = namei(&nd)) != 0) 2919 return (error); 2920 vp = nd.ni_vp; 2921 if (vp != NULL) { 2922 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2923 if (nd.ni_dvp == vp) 2924 vrele(nd.ni_dvp); 2925 else 2926 vput(nd.ni_dvp); 2927 vrele(vp); 2928 return (EEXIST); 2929 } 2930 VATTR_NULL(&vattr); 2931 vattr.va_type = VDIR; 2932 vattr.va_mode = 2933 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2934 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2935 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2936 if (!error) 2937 vput(nd.ni_vp); 2938 return (error); 2939 } 2940 2941 /* 2942 * Remove a directory file. 2943 */ 2944 /* ARGSUSED */ 2945 int 2946 sys_rmdir(p, v, retval) 2947 struct proc *p; 2948 void *v; 2949 register_t *retval; 2950 { 2951 struct sys_rmdir_args /* { 2952 syscallarg(const char *) path; 2953 } */ *uap = v; 2954 struct vnode *vp; 2955 int error; 2956 struct nameidata nd; 2957 2958 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2959 SCARG(uap, path), p); 2960 if ((error = namei(&nd)) != 0) 2961 return (error); 2962 vp = nd.ni_vp; 2963 if (vp->v_type != VDIR) { 2964 error = ENOTDIR; 2965 goto out; 2966 } 2967 /* 2968 * No rmdir "." please. 2969 */ 2970 if (nd.ni_dvp == vp) { 2971 error = EINVAL; 2972 goto out; 2973 } 2974 /* 2975 * The root of a mounted filesystem cannot be deleted. 2976 */ 2977 if (vp->v_flag & VROOT) 2978 error = EBUSY; 2979 out: 2980 if (!error) { 2981 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2982 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2983 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2984 } else { 2985 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2986 if (nd.ni_dvp == vp) 2987 vrele(nd.ni_dvp); 2988 else 2989 vput(nd.ni_dvp); 2990 vput(vp); 2991 } 2992 return (error); 2993 } 2994 2995 /* 2996 * Read a block of directory entries in a file system independent format. 2997 */ 2998 int 2999 sys_getdents(p, v, retval) 3000 struct proc *p; 3001 void *v; 3002 register_t *retval; 3003 { 3004 struct sys_getdents_args /* { 3005 syscallarg(int) fd; 3006 syscallarg(char *) buf; 3007 syscallarg(size_t) count; 3008 } */ *uap = v; 3009 struct file *fp; 3010 int error, done; 3011 3012 /* getvnode() will use the descriptor for us */ 3013 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3014 return (error); 3015 if ((fp->f_flag & FREAD) == 0) { 3016 error = EBADF; 3017 goto out; 3018 } 3019 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3020 SCARG(uap, count), &done, p, 0, 0); 3021 *retval = done; 3022 out: 3023 FILE_UNUSE(fp, p); 3024 return (error); 3025 } 3026 3027 /* 3028 * Set the mode mask for creation of filesystem nodes. 3029 */ 3030 int 3031 sys_umask(p, v, retval) 3032 struct proc *p; 3033 void *v; 3034 register_t *retval; 3035 { 3036 struct sys_umask_args /* { 3037 syscallarg(mode_t) newmask; 3038 } */ *uap = v; 3039 struct cwdinfo *cwdi; 3040 3041 cwdi = p->p_cwdi; 3042 *retval = cwdi->cwdi_cmask; 3043 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3044 return (0); 3045 } 3046 3047 /* 3048 * Void all references to file by ripping underlying filesystem 3049 * away from vnode. 3050 */ 3051 /* ARGSUSED */ 3052 int 3053 sys_revoke(p, v, retval) 3054 struct proc *p; 3055 void *v; 3056 register_t *retval; 3057 { 3058 struct sys_revoke_args /* { 3059 syscallarg(const char *) path; 3060 } */ *uap = v; 3061 struct vnode *vp; 3062 struct vattr vattr; 3063 int error; 3064 struct nameidata nd; 3065 3066 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3067 if ((error = namei(&nd)) != 0) 3068 return (error); 3069 vp = nd.ni_vp; 3070 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3071 goto out; 3072 if (p->p_ucred->cr_uid != vattr.va_uid && 3073 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3074 goto out; 3075 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3076 VOP_REVOKE(vp, REVOKEALL); 3077 out: 3078 vrele(vp); 3079 return (error); 3080 } 3081 3082 /* 3083 * Convert a user file descriptor to a kernel file entry. 3084 */ 3085 int 3086 getvnode(fdp, fd, fpp) 3087 struct filedesc *fdp; 3088 int fd; 3089 struct file **fpp; 3090 { 3091 struct vnode *vp; 3092 struct file *fp; 3093 3094 if ((u_int)fd >= fdp->fd_nfiles || 3095 (fp = fdp->fd_ofiles[fd]) == NULL || 3096 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3097 return (EBADF); 3098 3099 FILE_USE(fp); 3100 3101 if (fp->f_type != DTYPE_VNODE) { 3102 FILE_UNUSE(fp, NULL); 3103 return (EINVAL); 3104 } 3105 3106 vp = (struct vnode *)fp->f_data; 3107 if (vp->v_type == VBAD) { 3108 FILE_UNUSE(fp, NULL); 3109 return (EBADF); 3110 } 3111 3112 *fpp = fp; 3113 return (0); 3114 } 3115
Indexes created Fri Oct 03 02:09:57 GMT 2025