vfs_syscalls.c revision 1.235
1 /* $NetBSD: vfs_syscalls.c,v 1.235 2005/12/12 16:26:33 elad 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.235 2005/12/12 16:26:33 elad Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_ktrace.h" 45 #include "opt_verified_exec.h" 46 #include "fss.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/namei.h> 51 #include <sys/filedesc.h> 52 #include <sys/kernel.h> 53 #include <sys/file.h> 54 #include <sys/stat.h> 55 #include <sys/vnode.h> 56 #include <sys/mount.h> 57 #include <sys/proc.h> 58 #include <sys/uio.h> 59 #include <sys/malloc.h> 60 #include <sys/dirent.h> 61 #include <sys/sysctl.h> 62 #include <sys/sa.h> 63 #include <sys/syscallargs.h> 64 #ifdef KTRACE 65 #include <sys/ktrace.h> 66 #endif 67 #ifdef VERIFIED_EXEC 68 #include <sys/verified_exec.h> 69 #endif /* VERIFIED_EXEC */ 70 71 #include <miscfs/genfs/genfs.h> 72 #include <miscfs/syncfs/syncfs.h> 73 74 #ifdef COMPAT_30 75 #include "opt_nfsserver.h" 76 #include <nfs/rpcv2.h> 77 #include <nfs/nfsproto.h> 78 #include <nfs/nfs.h> 79 #include <nfs/nfs_var.h> 80 #endif 81 82 #if NFSS > 0 83 #include <dev/fssvar.h> 84 #endif 85 86 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 87 88 static int change_dir(struct nameidata *, struct lwp *); 89 static int change_flags(struct vnode *, u_long, struct lwp *); 90 static int change_mode(struct vnode *, int, struct lwp *l); 91 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 92 static int change_utimes(struct vnode *vp, const struct timeval *, 93 struct lwp *l); 94 static int rename_files(const char *, const char *, struct lwp *, int); 95 96 void checkdirs(struct vnode *); 97 98 int dovfsusermount = 0; 99 100 /* 101 * Virtual File System System Calls 102 */ 103 104 /* 105 * Mount a file system. 106 */ 107 108 #if defined(COMPAT_09) || defined(COMPAT_43) 109 /* 110 * This table is used to maintain compatibility with 4.3BSD 111 * and NetBSD 0.9 mount syscalls. Note, the order is important! 112 * 113 * Do not modify this table. It should only contain filesystems 114 * supported by NetBSD 0.9 and 4.3BSD. 115 */ 116 const char * const mountcompatnames[] = { 117 NULL, /* 0 = MOUNT_NONE */ 118 MOUNT_FFS, /* 1 = MOUNT_UFS */ 119 MOUNT_NFS, /* 2 */ 120 MOUNT_MFS, /* 3 */ 121 MOUNT_MSDOS, /* 4 */ 122 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 123 MOUNT_FDESC, /* 6 */ 124 MOUNT_KERNFS, /* 7 */ 125 NULL, /* 8 = MOUNT_DEVFS */ 126 MOUNT_AFS, /* 9 */ 127 }; 128 const int nmountcompatnames = sizeof(mountcompatnames) / 129 sizeof(mountcompatnames[0]); 130 #endif /* COMPAT_09 || COMPAT_43 */ 131 132 /* ARGSUSED */ 133 int 134 sys_mount(struct lwp *l, void *v, register_t *retval) 135 { 136 struct sys_mount_args /* { 137 syscallarg(const char *) type; 138 syscallarg(const char *) path; 139 syscallarg(int) flags; 140 syscallarg(void *) data; 141 } */ *uap = v; 142 struct proc *p = l->l_proc; 143 struct vnode *vp; 144 struct mount *mp; 145 int error, flag = 0; 146 char fstypename[MFSNAMELEN]; 147 struct vattr va; 148 struct nameidata nd; 149 struct vfsops *vfs; 150 151 /* 152 * if MNT_GETARGS is specified, it should be only flag. 153 */ 154 155 if ((SCARG(uap, flags) & MNT_GETARGS) != 0 && 156 (SCARG(uap, flags) & ~MNT_GETARGS) != 0) { 157 return EINVAL; 158 } 159 160 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 161 (error = suser(p->p_ucred, &p->p_acflag))) 162 return (error); 163 /* 164 * Get vnode to be covered 165 */ 166 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 167 SCARG(uap, path), l); 168 if ((error = namei(&nd)) != 0) 169 return (error); 170 vp = nd.ni_vp; 171 /* 172 * A lookup in VFS_MOUNT might result in an attempt to 173 * lock this vnode again, so make the lock recursive. 174 */ 175 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 176 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 177 if ((vp->v_flag & VROOT) == 0) { 178 vput(vp); 179 return (EINVAL); 180 } 181 mp = vp->v_mount; 182 flag = mp->mnt_flag; 183 vfs = mp->mnt_op; 184 /* 185 * We only allow the filesystem to be reloaded if it 186 * is currently mounted read-only. 187 */ 188 if ((SCARG(uap, flags) & MNT_RELOAD) && 189 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 190 vput(vp); 191 return (EOPNOTSUPP); /* Needs translation */ 192 } 193 /* 194 * In "highly secure" mode, don't let the caller do anything 195 * but downgrade a filesystem from read-write to read-only. 196 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 197 */ 198 if (securelevel >= 2 && 199 SCARG(uap, flags) != MNT_GETARGS && 200 SCARG(uap, flags) != 201 (mp->mnt_flag | MNT_RDONLY | 202 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 203 vput(vp); 204 return (EPERM); 205 } 206 mp->mnt_flag |= SCARG(uap, flags) & 207 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 208 /* 209 * Only root, or the user that did the original mount is 210 * permitted to update it. 211 */ 212 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 213 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 214 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 215 vput(vp); 216 return (error); 217 } 218 /* 219 * Do not allow NFS export by non-root users. For non-root 220 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 221 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 222 */ 223 if (p->p_ucred->cr_uid != 0) { 224 if (SCARG(uap, flags) & MNT_EXPORTED) { 225 vput(vp); 226 return (EPERM); 227 } 228 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 229 if (flag & MNT_NOEXEC) 230 SCARG(uap, flags) |= MNT_NOEXEC; 231 } 232 if (vfs_busy(mp, LK_NOWAIT, 0)) { 233 vput(vp); 234 return (EPERM); 235 } 236 goto update; 237 } else { 238 if (securelevel >= 2) { 239 vput(vp); 240 return (EPERM); 241 } 242 } 243 /* 244 * If the user is not root, ensure that they own the directory 245 * onto which we are attempting to mount. 246 */ 247 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, l)) != 0 || 248 (va.va_uid != p->p_ucred->cr_uid && 249 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 250 vput(vp); 251 return (error); 252 } 253 /* 254 * Do not allow NFS export by non-root users. For non-root users, 255 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 256 * mount point is already MNT_NOEXEC. 257 */ 258 if (p->p_ucred->cr_uid != 0) { 259 if (SCARG(uap, flags) & MNT_EXPORTED) { 260 vput(vp); 261 return (EPERM); 262 } 263 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 264 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 265 SCARG(uap, flags) |= MNT_NOEXEC; 266 } 267 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, l, 0, 0)) != 0) { 268 vput(vp); 269 return (error); 270 } 271 if (vp->v_type != VDIR) { 272 vput(vp); 273 return (ENOTDIR); 274 } 275 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 276 if (error) { 277 #if defined(COMPAT_09) || defined(COMPAT_43) 278 /* 279 * Historically, filesystem types were identified by numbers. 280 * If we get an integer for the filesystem type instead of a 281 * string, we check to see if it matches one of the historic 282 * filesystem types. 283 */ 284 u_long fsindex = (u_long)SCARG(uap, type); 285 if (fsindex >= nmountcompatnames || 286 mountcompatnames[fsindex] == NULL) { 287 vput(vp); 288 return (ENODEV); 289 } 290 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 291 #else 292 vput(vp); 293 return (error); 294 #endif 295 } 296 #ifdef COMPAT_10 297 /* Accept `ufs' as an alias for `ffs'. */ 298 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 299 strncpy(fstypename, "ffs", MFSNAMELEN); 300 #endif 301 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 302 vput(vp); 303 return (ENODEV); 304 } 305 if (vp->v_mountedhere != NULL) { 306 vput(vp); 307 return (EBUSY); 308 } 309 310 /* 311 * Allocate and initialize the file system. 312 */ 313 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 314 M_MOUNT, M_WAITOK); 315 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 316 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 317 simple_lock_init(&mp->mnt_slock); 318 (void)vfs_busy(mp, LK_NOWAIT, 0); 319 mp->mnt_op = vfs; 320 vfs->vfs_refcount++; 321 mp->mnt_vnodecovered = vp; 322 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 323 mp->mnt_unmounter = NULL; 324 mp->mnt_leaf = mp; 325 326 /* 327 * The underlying file system may refuse the mount for 328 * various reasons. Allow the user to force it to happen. 329 */ 330 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 331 update: 332 if ((SCARG(uap, flags) & MNT_GETARGS) == 0) { 333 /* 334 * Set the mount level flags. 335 */ 336 if (SCARG(uap, flags) & MNT_RDONLY) 337 mp->mnt_flag |= MNT_RDONLY; 338 else if (mp->mnt_flag & MNT_RDONLY) 339 mp->mnt_iflag |= IMNT_WANTRDWR; 340 mp->mnt_flag &= 341 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 342 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 343 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 344 MNT_MAGICLINKS); 345 mp->mnt_flag |= SCARG(uap, flags) & 346 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 347 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 348 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 349 MNT_IGNORE | MNT_MAGICLINKS); 350 } 351 /* 352 * Mount the filesystem. 353 */ 354 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, l); 355 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 356 #if defined(COMPAT_30) && defined(NFSSERVER) 357 if (mp->mnt_flag & MNT_UPDATE && error != 0) { 358 int error2; 359 360 /* Update failed; let's try and see if it was an 361 * export request. */ 362 error2 = nfs_update_exports_30(mp, SCARG(uap, path), 363 SCARG(uap, data), l); 364 365 /* Only update error code if the export request was 366 * understood but some problem occurred while 367 * processing it. */ 368 if (error2 != EJUSTRETURN) 369 error = error2; 370 } 371 #endif 372 if (mp->mnt_iflag & IMNT_WANTRDWR) 373 mp->mnt_flag &= ~MNT_RDONLY; 374 if (error) 375 mp->mnt_flag = flag; 376 mp->mnt_flag &=~ 377 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 378 mp->mnt_iflag &=~ IMNT_WANTRDWR; 379 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 380 if (mp->mnt_syncer == NULL) 381 error = vfs_allocate_syncvnode(mp); 382 } else { 383 if (mp->mnt_syncer != NULL) 384 vfs_deallocate_syncvnode(mp); 385 } 386 vfs_unbusy(mp); 387 VOP_UNLOCK(vp, 0); 388 vrele(vp); 389 return (error); 390 } 391 /* 392 * Put the new filesystem on the mount list after root. 393 */ 394 cache_purge(vp); 395 if (!error) { 396 mp->mnt_flag &=~ 397 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 398 mp->mnt_iflag &=~ IMNT_WANTRDWR; 399 vp->v_mountedhere = mp; 400 simple_lock(&mountlist_slock); 401 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 402 simple_unlock(&mountlist_slock); 403 checkdirs(vp); 404 VOP_UNLOCK(vp, 0); 405 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 406 error = vfs_allocate_syncvnode(mp); 407 vfs_unbusy(mp); 408 (void) VFS_STATVFS(mp, &mp->mnt_stat, l); 409 if ((error = VFS_START(mp, 0, l))) 410 vrele(vp); 411 } else { 412 vp->v_mountedhere = (struct mount *)0; 413 vfs->vfs_refcount--; 414 vfs_unbusy(mp); 415 free(mp, M_MOUNT); 416 vput(vp); 417 } 418 return (error); 419 } 420 421 /* 422 * Scan all active processes to see if any of them have a current 423 * or root directory onto which the new filesystem has just been 424 * mounted. If so, replace them with the new mount point. 425 */ 426 void 427 checkdirs(struct vnode *olddp) 428 { 429 struct cwdinfo *cwdi; 430 struct vnode *newdp; 431 struct proc *p; 432 433 if (olddp->v_usecount == 1) 434 return; 435 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 436 panic("mount: lost mount"); 437 proclist_lock_read(); 438 PROCLIST_FOREACH(p, &allproc) { 439 cwdi = p->p_cwdi; 440 if (!cwdi) 441 continue; 442 if (cwdi->cwdi_cdir == olddp) { 443 vrele(cwdi->cwdi_cdir); 444 VREF(newdp); 445 cwdi->cwdi_cdir = newdp; 446 } 447 if (cwdi->cwdi_rdir == olddp) { 448 vrele(cwdi->cwdi_rdir); 449 VREF(newdp); 450 cwdi->cwdi_rdir = newdp; 451 } 452 } 453 proclist_unlock_read(); 454 if (rootvnode == olddp) { 455 vrele(rootvnode); 456 VREF(newdp); 457 rootvnode = newdp; 458 } 459 vput(newdp); 460 } 461 462 /* 463 * Unmount a file system. 464 * 465 * Note: unmount takes a path to the vnode mounted on as argument, 466 * not special file (as before). 467 */ 468 /* ARGSUSED */ 469 int 470 sys_unmount(struct lwp *l, void *v, register_t *retval) 471 { 472 struct sys_unmount_args /* { 473 syscallarg(const char *) path; 474 syscallarg(int) flags; 475 } */ *uap = v; 476 struct proc *p = l->l_proc; 477 struct vnode *vp; 478 struct mount *mp; 479 int error; 480 struct nameidata nd; 481 482 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 483 SCARG(uap, path), l); 484 if ((error = namei(&nd)) != 0) 485 return (error); 486 vp = nd.ni_vp; 487 mp = vp->v_mount; 488 489 /* 490 * Only root, or the user that did the original mount is 491 * permitted to unmount this filesystem. 492 */ 493 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 494 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 495 vput(vp); 496 return (error); 497 } 498 499 /* 500 * Don't allow unmounting the root file system. 501 */ 502 if (mp->mnt_flag & MNT_ROOTFS) { 503 vput(vp); 504 return (EINVAL); 505 } 506 507 /* 508 * Must be the root of the filesystem 509 */ 510 if ((vp->v_flag & VROOT) == 0) { 511 vput(vp); 512 return (EINVAL); 513 } 514 vput(vp); 515 516 /* 517 * XXX Freeze syncer. Must do this before locking the 518 * mount point. See dounmount() for details. 519 */ 520 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 521 522 if (vfs_busy(mp, 0, 0)) { 523 lockmgr(&syncer_lock, LK_RELEASE, NULL); 524 return (EBUSY); 525 } 526 527 return (dounmount(mp, SCARG(uap, flags), l)); 528 } 529 530 /* 531 * Do the actual file system unmount. File system is assumed to have been 532 * marked busy by the caller. 533 */ 534 int 535 dounmount(struct mount *mp, int flags, struct lwp *l) 536 { 537 struct vnode *coveredvp; 538 int error; 539 int async; 540 int used_syncer; 541 542 simple_lock(&mountlist_slock); 543 vfs_unbusy(mp); 544 used_syncer = (mp->mnt_syncer != NULL); 545 546 /* 547 * XXX Syncer must be frozen when we get here. This should really 548 * be done on a per-mountpoint basis, but especially the softdep 549 * code possibly called from the syncer doesn't exactly work on a 550 * per-mountpoint basis, so the softdep code would become a maze 551 * of vfs_busy() calls. 552 * 553 * The caller of dounmount() must acquire syncer_lock because 554 * the syncer itself acquires locks in syncer_lock -> vfs_busy 555 * order, and we must preserve that order to avoid deadlock. 556 * 557 * So, if the file system did not use the syncer, now is 558 * the time to release the syncer_lock. 559 */ 560 if (used_syncer == 0) 561 lockmgr(&syncer_lock, LK_RELEASE, NULL); 562 563 mp->mnt_iflag |= IMNT_UNMOUNT; 564 mp->mnt_unmounter = l; 565 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 566 vn_start_write(NULL, &mp, V_WAIT); 567 568 async = mp->mnt_flag & MNT_ASYNC; 569 mp->mnt_flag &= ~MNT_ASYNC; 570 cache_purgevfs(mp); /* remove cache entries for this file sys */ 571 if (mp->mnt_syncer != NULL) 572 vfs_deallocate_syncvnode(mp); 573 error = 0; 574 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 575 #if NFSS > 0 576 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 577 #endif 578 if (error == 0) 579 error = VFS_SYNC(mp, MNT_WAIT, l->l_proc->p_ucred, l); 580 } 581 if (error == 0 || (flags & MNT_FORCE)) 582 error = VFS_UNMOUNT(mp, flags, l); 583 vn_finished_write(mp, 0); 584 simple_lock(&mountlist_slock); 585 if (error) { 586 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 587 (void) vfs_allocate_syncvnode(mp); 588 mp->mnt_iflag &= ~IMNT_UNMOUNT; 589 mp->mnt_unmounter = NULL; 590 mp->mnt_flag |= async; 591 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 592 &mountlist_slock); 593 if (used_syncer) 594 lockmgr(&syncer_lock, LK_RELEASE, NULL); 595 simple_lock(&mp->mnt_slock); 596 while (mp->mnt_wcnt > 0) { 597 wakeup(mp); 598 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 599 0, &mp->mnt_slock); 600 } 601 simple_unlock(&mp->mnt_slock); 602 return (error); 603 } 604 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 605 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 606 coveredvp->v_mountedhere = NULL; 607 vrele(coveredvp); 608 } 609 mp->mnt_op->vfs_refcount--; 610 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 611 panic("unmount: dangling vnode"); 612 mp->mnt_iflag |= IMNT_GONE; 613 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 614 if (used_syncer) 615 lockmgr(&syncer_lock, LK_RELEASE, NULL); 616 simple_lock(&mp->mnt_slock); 617 while (mp->mnt_wcnt > 0) { 618 wakeup(mp); 619 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 620 } 621 simple_unlock(&mp->mnt_slock); 622 vfs_hooks_unmount(mp); 623 free(mp, M_MOUNT); 624 return (0); 625 } 626 627 /* 628 * Sync each mounted filesystem. 629 */ 630 #ifdef DEBUG 631 int syncprt = 0; 632 struct ctldebug debug0 = { "syncprt", &syncprt }; 633 #endif 634 635 /* ARGSUSED */ 636 int 637 sys_sync(struct lwp *l, void *v, register_t *retval) 638 { 639 struct mount *mp, *nmp; 640 int asyncflag; 641 struct proc *p = l == NULL ? &proc0 : l->l_proc; 642 643 simple_lock(&mountlist_slock); 644 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 645 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 646 nmp = mp->mnt_list.cqe_prev; 647 continue; 648 } 649 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 650 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 651 asyncflag = mp->mnt_flag & MNT_ASYNC; 652 mp->mnt_flag &= ~MNT_ASYNC; 653 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, l); 654 if (asyncflag) 655 mp->mnt_flag |= MNT_ASYNC; 656 vn_finished_write(mp, 0); 657 } 658 simple_lock(&mountlist_slock); 659 nmp = mp->mnt_list.cqe_prev; 660 vfs_unbusy(mp); 661 662 } 663 simple_unlock(&mountlist_slock); 664 #ifdef DEBUG 665 if (syncprt) 666 vfs_bufstats(); 667 #endif /* DEBUG */ 668 return (0); 669 } 670 671 /* 672 * Change filesystem quotas. 673 */ 674 /* ARGSUSED */ 675 int 676 sys_quotactl(struct lwp *l, void *v, register_t *retval) 677 { 678 struct sys_quotactl_args /* { 679 syscallarg(const char *) path; 680 syscallarg(int) cmd; 681 syscallarg(int) uid; 682 syscallarg(caddr_t) arg; 683 } */ *uap = v; 684 struct mount *mp; 685 int error; 686 struct nameidata nd; 687 688 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 689 if ((error = namei(&nd)) != 0) 690 return (error); 691 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 692 vrele(nd.ni_vp); 693 if (error) 694 return (error); 695 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 696 SCARG(uap, arg), l); 697 vn_finished_write(mp, 0); 698 return (error); 699 } 700 701 int 702 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 703 int root) 704 { 705 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 706 int error = 0; 707 708 /* 709 * If MNT_NOWAIT or MNT_LAZY is specified, do not 710 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 711 * overrides MNT_NOWAIT. 712 */ 713 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 714 (flags != MNT_WAIT && flags != 0)) { 715 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 716 goto done; 717 } 718 719 /* Get the filesystem stats now */ 720 memset(sp, 0, sizeof(*sp)); 721 if ((error = VFS_STATVFS(mp, sp, l)) != 0) { 722 return error; 723 } 724 725 if (cwdi->cwdi_rdir == NULL) 726 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 727 done: 728 if (cwdi->cwdi_rdir != NULL) { 729 size_t len; 730 char *bp; 731 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 732 if (!path) 733 return ENOMEM; 734 735 bp = path + MAXPATHLEN; 736 *--bp = '\0'; 737 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 738 MAXPATHLEN / 2, 0, l); 739 if (error) { 740 free(path, M_TEMP); 741 return error; 742 } 743 len = strlen(bp); 744 /* 745 * for mount points that are below our root, we can see 746 * them, so we fix up the pathname and return them. The 747 * rest we cannot see, so we don't allow viewing the 748 * data. 749 */ 750 if (strncmp(bp, sp->f_mntonname, len) == 0) { 751 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 752 sizeof(sp->f_mntonname)); 753 if (sp->f_mntonname[0] == '\0') 754 (void)strlcpy(sp->f_mntonname, "/", 755 sizeof(sp->f_mntonname)); 756 } else { 757 if (root) 758 (void)strlcpy(sp->f_mntonname, "/", 759 sizeof(sp->f_mntonname)); 760 else 761 error = EPERM; 762 } 763 free(path, M_TEMP); 764 } 765 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 766 return error; 767 } 768 769 /* 770 * Get filesystem statistics. 771 */ 772 /* ARGSUSED */ 773 int 774 sys_statvfs1(struct lwp *l, void *v, register_t *retval) 775 { 776 struct sys_statvfs1_args /* { 777 syscallarg(const char *) path; 778 syscallarg(struct statvfs *) buf; 779 syscallarg(int) flags; 780 } */ *uap = v; 781 struct mount *mp; 782 struct statvfs sbuf; 783 int error; 784 struct nameidata nd; 785 786 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 787 if ((error = namei(&nd)) != 0) 788 return error; 789 mp = nd.ni_vp->v_mount; 790 vrele(nd.ni_vp); 791 if ((error = dostatvfs(mp, &sbuf, l, SCARG(uap, flags), 1)) != 0) 792 return error; 793 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 794 } 795 796 /* 797 * Get filesystem statistics. 798 */ 799 /* ARGSUSED */ 800 int 801 sys_fstatvfs1(struct lwp *l, void *v, register_t *retval) 802 { 803 struct sys_fstatvfs1_args /* { 804 syscallarg(int) fd; 805 syscallarg(struct statvfs *) buf; 806 syscallarg(int) flags; 807 } */ *uap = v; 808 struct proc *p = l->l_proc; 809 struct file *fp; 810 struct mount *mp; 811 struct statvfs sbuf; 812 int error; 813 814 /* getvnode() will use the descriptor for us */ 815 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 816 return (error); 817 mp = ((struct vnode *)fp->f_data)->v_mount; 818 if ((error = dostatvfs(mp, &sbuf, l, SCARG(uap, flags), 1)) != 0) 819 goto out; 820 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 821 out: 822 FILE_UNUSE(fp, l); 823 return error; 824 } 825 826 827 /* 828 * Get statistics on all filesystems. 829 */ 830 int 831 sys_getvfsstat(struct lwp *l, void *v, register_t *retval) 832 { 833 struct sys_getvfsstat_args /* { 834 syscallarg(struct statvfs *) buf; 835 syscallarg(size_t) bufsize; 836 syscallarg(int) flags; 837 } */ *uap = v; 838 int root = 0; 839 struct proc *p = l->l_proc; 840 struct mount *mp, *nmp; 841 struct statvfs sbuf; 842 struct statvfs *sfsp; 843 size_t count, maxcount; 844 int error = 0; 845 846 maxcount = SCARG(uap, bufsize) / sizeof(struct statvfs); 847 sfsp = SCARG(uap, buf); 848 simple_lock(&mountlist_slock); 849 count = 0; 850 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 851 mp = nmp) { 852 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 853 nmp = CIRCLEQ_NEXT(mp, mnt_list); 854 continue; 855 } 856 if (sfsp && count < maxcount) { 857 error = dostatvfs(mp, &sbuf, l, SCARG(uap, flags), 0); 858 if (error) { 859 simple_lock(&mountlist_slock); 860 nmp = CIRCLEQ_NEXT(mp, mnt_list); 861 vfs_unbusy(mp); 862 continue; 863 } 864 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 865 if (error) { 866 vfs_unbusy(mp); 867 return (error); 868 } 869 sfsp++; 870 root |= strcmp(sbuf.f_mntonname, "/") == 0; 871 } 872 count++; 873 simple_lock(&mountlist_slock); 874 nmp = CIRCLEQ_NEXT(mp, mnt_list); 875 vfs_unbusy(mp); 876 } 877 simple_unlock(&mountlist_slock); 878 if (root == 0 && p->p_cwdi->cwdi_rdir) { 879 /* 880 * fake a root entry 881 */ 882 if ((error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, l, 883 SCARG(uap, flags), 1)) != 0) 884 return error; 885 if (sfsp) 886 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 887 count++; 888 } 889 if (sfsp && count > maxcount) 890 *retval = maxcount; 891 else 892 *retval = count; 893 return error; 894 } 895 896 /* 897 * Change current working directory to a given file descriptor. 898 */ 899 /* ARGSUSED */ 900 int 901 sys_fchdir(struct lwp *l, void *v, register_t *retval) 902 { 903 struct sys_fchdir_args /* { 904 syscallarg(int) fd; 905 } */ *uap = v; 906 struct proc *p = l->l_proc; 907 struct filedesc *fdp = p->p_fd; 908 struct cwdinfo *cwdi = p->p_cwdi; 909 struct vnode *vp, *tdp; 910 struct mount *mp; 911 struct file *fp; 912 int error; 913 914 /* getvnode() will use the descriptor for us */ 915 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 916 return (error); 917 vp = (struct vnode *)fp->f_data; 918 919 VREF(vp); 920 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 921 if (vp->v_type != VDIR) 922 error = ENOTDIR; 923 else 924 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, l); 925 while (!error && (mp = vp->v_mountedhere) != NULL) { 926 if (vfs_busy(mp, 0, 0)) 927 continue; 928 error = VFS_ROOT(mp, &tdp); 929 vfs_unbusy(mp); 930 if (error) 931 break; 932 vput(vp); 933 vp = tdp; 934 } 935 if (error) { 936 vput(vp); 937 goto out; 938 } 939 VOP_UNLOCK(vp, 0); 940 941 /* 942 * Disallow changing to a directory not under the process's 943 * current root directory (if there is one). 944 */ 945 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 946 vrele(vp); 947 error = EPERM; /* operation not permitted */ 948 goto out; 949 } 950 951 vrele(cwdi->cwdi_cdir); 952 cwdi->cwdi_cdir = vp; 953 out: 954 FILE_UNUSE(fp, l); 955 return (error); 956 } 957 958 /* 959 * Change this process's notion of the root directory to a given file 960 * descriptor. 961 */ 962 int 963 sys_fchroot(struct lwp *l, void *v, register_t *retval) 964 { 965 struct sys_fchroot_args *uap = v; 966 struct proc *p = l->l_proc; 967 struct filedesc *fdp = p->p_fd; 968 struct cwdinfo *cwdi = p->p_cwdi; 969 struct vnode *vp; 970 struct file *fp; 971 int error; 972 973 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 974 return error; 975 /* getvnode() will use the descriptor for us */ 976 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 977 return error; 978 vp = (struct vnode *) fp->f_data; 979 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 980 if (vp->v_type != VDIR) 981 error = ENOTDIR; 982 else 983 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, l); 984 VOP_UNLOCK(vp, 0); 985 if (error) 986 goto out; 987 VREF(vp); 988 989 /* 990 * Prevent escaping from chroot by putting the root under 991 * the working directory. Silently chdir to / if we aren't 992 * already there. 993 */ 994 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 995 /* 996 * XXX would be more failsafe to change directory to a 997 * deadfs node here instead 998 */ 999 vrele(cwdi->cwdi_cdir); 1000 VREF(vp); 1001 cwdi->cwdi_cdir = vp; 1002 } 1003 1004 if (cwdi->cwdi_rdir != NULL) 1005 vrele(cwdi->cwdi_rdir); 1006 cwdi->cwdi_rdir = vp; 1007 out: 1008 FILE_UNUSE(fp, l); 1009 return (error); 1010 } 1011 1012 /* 1013 * Change current working directory (``.''). 1014 */ 1015 /* ARGSUSED */ 1016 int 1017 sys_chdir(struct lwp *l, void *v, register_t *retval) 1018 { 1019 struct sys_chdir_args /* { 1020 syscallarg(const char *) path; 1021 } */ *uap = v; 1022 struct proc *p = l->l_proc; 1023 struct cwdinfo *cwdi = p->p_cwdi; 1024 int error; 1025 struct nameidata nd; 1026 1027 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1028 SCARG(uap, path), l); 1029 if ((error = change_dir(&nd, l)) != 0) 1030 return (error); 1031 vrele(cwdi->cwdi_cdir); 1032 cwdi->cwdi_cdir = nd.ni_vp; 1033 return (0); 1034 } 1035 1036 /* 1037 * Change notion of root (``/'') directory. 1038 */ 1039 /* ARGSUSED */ 1040 int 1041 sys_chroot(struct lwp *l, void *v, register_t *retval) 1042 { 1043 struct sys_chroot_args /* { 1044 syscallarg(const char *) path; 1045 } */ *uap = v; 1046 struct proc *p = l->l_proc; 1047 struct cwdinfo *cwdi = p->p_cwdi; 1048 struct vnode *vp; 1049 int error; 1050 struct nameidata nd; 1051 1052 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1053 return (error); 1054 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1055 SCARG(uap, path), l); 1056 if ((error = change_dir(&nd, l)) != 0) 1057 return (error); 1058 if (cwdi->cwdi_rdir != NULL) 1059 vrele(cwdi->cwdi_rdir); 1060 vp = nd.ni_vp; 1061 cwdi->cwdi_rdir = vp; 1062 1063 /* 1064 * Prevent escaping from chroot by putting the root under 1065 * the working directory. Silently chdir to / if we aren't 1066 * already there. 1067 */ 1068 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1069 /* 1070 * XXX would be more failsafe to change directory to a 1071 * deadfs node here instead 1072 */ 1073 vrele(cwdi->cwdi_cdir); 1074 VREF(vp); 1075 cwdi->cwdi_cdir = vp; 1076 } 1077 1078 return (0); 1079 } 1080 1081 /* 1082 * Common routine for chroot and chdir. 1083 */ 1084 static int 1085 change_dir(struct nameidata *ndp, struct lwp *l) 1086 { 1087 struct vnode *vp; 1088 int error; 1089 1090 if ((error = namei(ndp)) != 0) 1091 return (error); 1092 vp = ndp->ni_vp; 1093 if (vp->v_type != VDIR) 1094 error = ENOTDIR; 1095 else 1096 error = VOP_ACCESS(vp, VEXEC, l->l_proc->p_ucred, l); 1097 1098 if (error) 1099 vput(vp); 1100 else 1101 VOP_UNLOCK(vp, 0); 1102 return (error); 1103 } 1104 1105 /* 1106 * Check permissions, allocate an open file structure, 1107 * and call the device open routine if any. 1108 */ 1109 int 1110 sys_open(struct lwp *l, void *v, register_t *retval) 1111 { 1112 struct sys_open_args /* { 1113 syscallarg(const char *) path; 1114 syscallarg(int) flags; 1115 syscallarg(int) mode; 1116 } */ *uap = v; 1117 struct proc *p = l->l_proc; 1118 struct cwdinfo *cwdi = p->p_cwdi; 1119 struct filedesc *fdp = p->p_fd; 1120 struct file *fp; 1121 struct vnode *vp; 1122 int flags, cmode; 1123 int type, indx, error; 1124 struct flock lf; 1125 struct nameidata nd; 1126 1127 flags = FFLAGS(SCARG(uap, flags)); 1128 if ((flags & (FREAD | FWRITE)) == 0) 1129 return (EINVAL); 1130 /* falloc() will use the file descriptor for us */ 1131 if ((error = falloc(p, &fp, &indx)) != 0) 1132 return (error); 1133 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1134 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 1135 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1136 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1137 FILE_UNUSE(fp, l); 1138 fdp->fd_ofiles[indx] = NULL; 1139 ffree(fp); 1140 if ((error == EDUPFD || error == EMOVEFD) && 1141 l->l_dupfd >= 0 && /* XXX from fdopen */ 1142 (error = 1143 dupfdopen(l, indx, l->l_dupfd, flags, error)) == 0) { 1144 *retval = indx; 1145 return (0); 1146 } 1147 if (error == ERESTART) 1148 error = EINTR; 1149 fdremove(fdp, indx); 1150 return (error); 1151 } 1152 l->l_dupfd = 0; 1153 vp = nd.ni_vp; 1154 fp->f_flag = flags & FMASK; 1155 fp->f_type = DTYPE_VNODE; 1156 fp->f_ops = &vnops; 1157 fp->f_data = vp; 1158 if (flags & (O_EXLOCK | O_SHLOCK)) { 1159 lf.l_whence = SEEK_SET; 1160 lf.l_start = 0; 1161 lf.l_len = 0; 1162 if (flags & O_EXLOCK) 1163 lf.l_type = F_WRLCK; 1164 else 1165 lf.l_type = F_RDLCK; 1166 type = F_FLOCK; 1167 if ((flags & FNONBLOCK) == 0) 1168 type |= F_WAIT; 1169 VOP_UNLOCK(vp, 0); 1170 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1171 if (error) { 1172 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1173 FILE_UNUSE(fp, l); 1174 ffree(fp); 1175 fdremove(fdp, indx); 1176 return (error); 1177 } 1178 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1179 fp->f_flag |= FHASLOCK; 1180 } 1181 VOP_UNLOCK(vp, 0); 1182 *retval = indx; 1183 FILE_SET_MATURE(fp); 1184 FILE_UNUSE(fp, l); 1185 return (0); 1186 } 1187 1188 /* 1189 * Get file handle system call 1190 */ 1191 int 1192 sys_getfh(struct lwp *l, void *v, register_t *retval) 1193 { 1194 struct sys_getfh_args /* { 1195 syscallarg(char *) fname; 1196 syscallarg(fhandle_t *) fhp; 1197 } */ *uap = v; 1198 struct proc *p = l->l_proc; 1199 struct vnode *vp; 1200 fhandle_t fh; 1201 int error; 1202 struct nameidata nd; 1203 1204 /* 1205 * Must be super user 1206 */ 1207 error = suser(p->p_ucred, &p->p_acflag); 1208 if (error) 1209 return (error); 1210 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1211 SCARG(uap, fname), l); 1212 error = namei(&nd); 1213 if (error) 1214 return (error); 1215 vp = nd.ni_vp; 1216 if (vp->v_mount->mnt_op->vfs_vptofh == NULL) 1217 return EOPNOTSUPP; 1218 memset(&fh, 0, sizeof(fh)); 1219 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsidx; 1220 error = VFS_VPTOFH(vp, &fh.fh_fid); 1221 vput(vp); 1222 if (error) 1223 return (error); 1224 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1225 return (error); 1226 } 1227 1228 /* 1229 * Open a file given a file handle. 1230 * 1231 * Check permissions, allocate an open file structure, 1232 * and call the device open routine if any. 1233 */ 1234 int 1235 sys_fhopen(struct lwp *l, void *v, register_t *retval) 1236 { 1237 struct sys_fhopen_args /* { 1238 syscallarg(const fhandle_t *) fhp; 1239 syscallarg(int) flags; 1240 } */ *uap = v; 1241 struct proc *p = l->l_proc; 1242 struct filedesc *fdp = p->p_fd; 1243 struct file *fp; 1244 struct vnode *vp = NULL; 1245 struct mount *mp; 1246 struct ucred *cred = p->p_ucred; 1247 int flags; 1248 struct file *nfp; 1249 int type, indx, error=0; 1250 struct flock lf; 1251 struct vattr va; 1252 fhandle_t fh; 1253 1254 /* 1255 * Must be super user 1256 */ 1257 if ((error = suser(p->p_ucred, &p->p_acflag))) 1258 return (error); 1259 1260 flags = FFLAGS(SCARG(uap, flags)); 1261 if ((flags & (FREAD | FWRITE)) == 0) 1262 return (EINVAL); 1263 if ((flags & O_CREAT)) 1264 return (EINVAL); 1265 /* falloc() will use the file descriptor for us */ 1266 if ((error = falloc(p, &nfp, &indx)) != 0) 1267 return (error); 1268 fp = nfp; 1269 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1270 goto bad; 1271 1272 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1273 error = ESTALE; 1274 goto bad; 1275 } 1276 1277 if (mp->mnt_op->vfs_fhtovp == NULL) { 1278 error = EOPNOTSUPP; 1279 goto bad; 1280 } 1281 1282 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1283 vp = NULL; /* most likely unnecessary sanity for bad: */ 1284 goto bad; 1285 } 1286 1287 /* Now do an effective vn_open */ 1288 1289 if (vp->v_type == VSOCK) { 1290 error = EOPNOTSUPP; 1291 goto bad; 1292 } 1293 if (flags & FREAD) { 1294 if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) 1295 goto bad; 1296 } 1297 if (flags & (FWRITE | O_TRUNC)) { 1298 if (vp->v_type == VDIR) { 1299 error = EISDIR; 1300 goto bad; 1301 } 1302 if ((error = vn_writechk(vp)) != 0 || 1303 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) 1304 goto bad; 1305 } 1306 if (flags & O_TRUNC) { 1307 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1308 goto bad; 1309 VOP_UNLOCK(vp, 0); /* XXX */ 1310 VOP_LEASE(vp, l, cred, LEASE_WRITE); 1311 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1312 VATTR_NULL(&va); 1313 va.va_size = 0; 1314 error = VOP_SETATTR(vp, &va, cred, l); 1315 vn_finished_write(mp, 0); 1316 if (error) 1317 goto bad; 1318 } 1319 if ((error = VOP_OPEN(vp, flags, cred, l)) != 0) 1320 goto bad; 1321 if (vp->v_type == VREG && 1322 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1323 error = EIO; 1324 goto bad; 1325 } 1326 if (flags & FWRITE) 1327 vp->v_writecount++; 1328 1329 /* done with modified vn_open, now finish what sys_open does. */ 1330 1331 fp->f_flag = flags & FMASK; 1332 fp->f_type = DTYPE_VNODE; 1333 fp->f_ops = &vnops; 1334 fp->f_data = vp; 1335 if (flags & (O_EXLOCK | O_SHLOCK)) { 1336 lf.l_whence = SEEK_SET; 1337 lf.l_start = 0; 1338 lf.l_len = 0; 1339 if (flags & O_EXLOCK) 1340 lf.l_type = F_WRLCK; 1341 else 1342 lf.l_type = F_RDLCK; 1343 type = F_FLOCK; 1344 if ((flags & FNONBLOCK) == 0) 1345 type |= F_WAIT; 1346 VOP_UNLOCK(vp, 0); 1347 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1348 if (error) { 1349 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1350 FILE_UNUSE(fp, l); 1351 ffree(fp); 1352 fdremove(fdp, indx); 1353 return (error); 1354 } 1355 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1356 fp->f_flag |= FHASLOCK; 1357 } 1358 VOP_UNLOCK(vp, 0); 1359 *retval = indx; 1360 FILE_SET_MATURE(fp); 1361 FILE_UNUSE(fp, l); 1362 return (0); 1363 1364 bad: 1365 FILE_UNUSE(fp, l); 1366 ffree(fp); 1367 fdremove(fdp, indx); 1368 if (vp != NULL) 1369 vput(vp); 1370 return (error); 1371 } 1372 1373 /* ARGSUSED */ 1374 int 1375 sys_fhstat(struct lwp *l, void *v, register_t *retval) 1376 { 1377 struct sys_fhstat_args /* { 1378 syscallarg(const fhandle_t *) fhp; 1379 syscallarg(struct stat *) sb; 1380 } */ *uap = v; 1381 struct proc *p = l->l_proc; 1382 struct stat sb; 1383 int error; 1384 fhandle_t fh; 1385 struct mount *mp; 1386 struct vnode *vp; 1387 1388 /* 1389 * Must be super user 1390 */ 1391 if ((error = suser(p->p_ucred, &p->p_acflag))) 1392 return (error); 1393 1394 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1395 return (error); 1396 1397 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1398 return (ESTALE); 1399 if (mp->mnt_op->vfs_fhtovp == NULL) 1400 return EOPNOTSUPP; 1401 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1402 return (error); 1403 error = vn_stat(vp, &sb, l); 1404 vput(vp); 1405 if (error) 1406 return (error); 1407 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1408 return (error); 1409 } 1410 1411 /* ARGSUSED */ 1412 int 1413 sys_fhstatvfs1(struct lwp *l, void *v, register_t *retval) 1414 { 1415 struct sys_fhstatvfs1_args /* { 1416 syscallarg(const fhandle_t *) fhp; 1417 syscallarg(struct statvfs *) buf; 1418 syscallarg(int) flags; 1419 } */ *uap = v; 1420 struct proc *p = l->l_proc; 1421 struct statvfs sbuf; 1422 fhandle_t fh; 1423 struct mount *mp; 1424 struct vnode *vp; 1425 int error; 1426 1427 /* 1428 * Must be super user 1429 */ 1430 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1431 return error; 1432 1433 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1434 return error; 1435 1436 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1437 return ESTALE; 1438 if (mp->mnt_op->vfs_fhtovp == NULL) 1439 return EOPNOTSUPP; 1440 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1441 return error; 1442 1443 mp = vp->v_mount; 1444 if ((error = dostatvfs(mp, &sbuf, l, SCARG(uap, flags), 1)) != 0) { 1445 vput(vp); 1446 return error; 1447 } 1448 vput(vp); 1449 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 1450 } 1451 1452 /* 1453 * Create a special file. 1454 */ 1455 /* ARGSUSED */ 1456 int 1457 sys_mknod(struct lwp *l, void *v, register_t *retval) 1458 { 1459 struct sys_mknod_args /* { 1460 syscallarg(const char *) path; 1461 syscallarg(int) mode; 1462 syscallarg(int) dev; 1463 } */ *uap = v; 1464 struct proc *p = l->l_proc; 1465 struct vnode *vp; 1466 struct mount *mp; 1467 struct vattr vattr; 1468 int error; 1469 int whiteout = 0; 1470 struct nameidata nd; 1471 1472 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1473 return (error); 1474 restart: 1475 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), l); 1476 if ((error = namei(&nd)) != 0) 1477 return (error); 1478 vp = nd.ni_vp; 1479 if (vp != NULL) 1480 error = EEXIST; 1481 else { 1482 VATTR_NULL(&vattr); 1483 vattr.va_mode = 1484 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1485 vattr.va_rdev = SCARG(uap, dev); 1486 whiteout = 0; 1487 1488 switch (SCARG(uap, mode) & S_IFMT) { 1489 case S_IFMT: /* used by badsect to flag bad sectors */ 1490 vattr.va_type = VBAD; 1491 break; 1492 case S_IFCHR: 1493 vattr.va_type = VCHR; 1494 break; 1495 case S_IFBLK: 1496 vattr.va_type = VBLK; 1497 break; 1498 case S_IFWHT: 1499 whiteout = 1; 1500 break; 1501 default: 1502 error = EINVAL; 1503 break; 1504 } 1505 } 1506 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1507 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1508 if (nd.ni_dvp == vp) 1509 vrele(nd.ni_dvp); 1510 else 1511 vput(nd.ni_dvp); 1512 if (vp) 1513 vrele(vp); 1514 if ((error = vn_start_write(NULL, &mp, 1515 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1516 return (error); 1517 goto restart; 1518 } 1519 if (!error) { 1520 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1521 if (whiteout) { 1522 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1523 if (error) 1524 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1525 vput(nd.ni_dvp); 1526 } else { 1527 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1528 &nd.ni_cnd, &vattr); 1529 if (error == 0) 1530 vput(nd.ni_vp); 1531 } 1532 } else { 1533 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1534 if (nd.ni_dvp == vp) 1535 vrele(nd.ni_dvp); 1536 else 1537 vput(nd.ni_dvp); 1538 if (vp) 1539 vrele(vp); 1540 } 1541 vn_finished_write(mp, 0); 1542 return (error); 1543 } 1544 1545 /* 1546 * Create a named pipe. 1547 */ 1548 /* ARGSUSED */ 1549 int 1550 sys_mkfifo(struct lwp *l, void *v, register_t *retval) 1551 { 1552 struct sys_mkfifo_args /* { 1553 syscallarg(const char *) path; 1554 syscallarg(int) mode; 1555 } */ *uap = v; 1556 struct proc *p = l->l_proc; 1557 struct mount *mp; 1558 struct vattr vattr; 1559 int error; 1560 struct nameidata nd; 1561 1562 restart: 1563 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), l); 1564 if ((error = namei(&nd)) != 0) 1565 return (error); 1566 if (nd.ni_vp != NULL) { 1567 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1568 if (nd.ni_dvp == nd.ni_vp) 1569 vrele(nd.ni_dvp); 1570 else 1571 vput(nd.ni_dvp); 1572 vrele(nd.ni_vp); 1573 return (EEXIST); 1574 } 1575 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1576 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1577 if (nd.ni_dvp == nd.ni_vp) 1578 vrele(nd.ni_dvp); 1579 else 1580 vput(nd.ni_dvp); 1581 if (nd.ni_vp) 1582 vrele(nd.ni_vp); 1583 if ((error = vn_start_write(NULL, &mp, 1584 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1585 return (error); 1586 goto restart; 1587 } 1588 VATTR_NULL(&vattr); 1589 vattr.va_type = VFIFO; 1590 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1591 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1592 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1593 if (error == 0) 1594 vput(nd.ni_vp); 1595 vn_finished_write(mp, 0); 1596 return (error); 1597 } 1598 1599 /* 1600 * Make a hard file link. 1601 */ 1602 /* ARGSUSED */ 1603 int 1604 sys_link(struct lwp *l, void *v, register_t *retval) 1605 { 1606 struct sys_link_args /* { 1607 syscallarg(const char *) path; 1608 syscallarg(const char *) link; 1609 } */ *uap = v; 1610 struct proc *p = l->l_proc; 1611 struct vnode *vp; 1612 struct mount *mp; 1613 struct nameidata nd; 1614 int error; 1615 1616 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 1617 if ((error = namei(&nd)) != 0) 1618 return (error); 1619 vp = nd.ni_vp; 1620 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1621 vrele(vp); 1622 return (error); 1623 } 1624 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), l); 1625 if ((error = namei(&nd)) != 0) 1626 goto out; 1627 if (nd.ni_vp) { 1628 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1629 if (nd.ni_dvp == nd.ni_vp) 1630 vrele(nd.ni_dvp); 1631 else 1632 vput(nd.ni_dvp); 1633 vrele(nd.ni_vp); 1634 error = EEXIST; 1635 goto out; 1636 } 1637 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1638 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 1639 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1640 out: 1641 vrele(vp); 1642 vn_finished_write(mp, 0); 1643 return (error); 1644 } 1645 1646 /* 1647 * Make a symbolic link. 1648 */ 1649 /* ARGSUSED */ 1650 int 1651 sys_symlink(struct lwp *l, void *v, register_t *retval) 1652 { 1653 struct sys_symlink_args /* { 1654 syscallarg(const char *) path; 1655 syscallarg(const char *) link; 1656 } */ *uap = v; 1657 struct proc *p = l->l_proc; 1658 struct mount *mp; 1659 struct vattr vattr; 1660 char *path; 1661 int error; 1662 struct nameidata nd; 1663 1664 path = PNBUF_GET(); 1665 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1666 if (error) 1667 goto out; 1668 restart: 1669 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), l); 1670 if ((error = namei(&nd)) != 0) 1671 goto out; 1672 if (nd.ni_vp) { 1673 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1674 if (nd.ni_dvp == nd.ni_vp) 1675 vrele(nd.ni_dvp); 1676 else 1677 vput(nd.ni_dvp); 1678 vrele(nd.ni_vp); 1679 error = EEXIST; 1680 goto out; 1681 } 1682 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1683 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1684 if (nd.ni_dvp == nd.ni_vp) 1685 vrele(nd.ni_dvp); 1686 else 1687 vput(nd.ni_dvp); 1688 if ((error = vn_start_write(NULL, &mp, 1689 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1690 return (error); 1691 goto restart; 1692 } 1693 VATTR_NULL(&vattr); 1694 vattr.va_type = VLNK; 1695 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1696 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1697 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1698 if (error == 0) 1699 vput(nd.ni_vp); 1700 vn_finished_write(mp, 0); 1701 out: 1702 PNBUF_PUT(path); 1703 return (error); 1704 } 1705 1706 /* 1707 * Delete a whiteout from the filesystem. 1708 */ 1709 /* ARGSUSED */ 1710 int 1711 sys_undelete(struct lwp *l, void *v, register_t *retval) 1712 { 1713 struct sys_undelete_args /* { 1714 syscallarg(const char *) path; 1715 } */ *uap = v; 1716 struct proc *p = l->l_proc; 1717 int error; 1718 struct mount *mp; 1719 struct nameidata nd; 1720 1721 restart: 1722 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1723 SCARG(uap, path), l); 1724 error = namei(&nd); 1725 if (error) 1726 return (error); 1727 1728 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1729 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1730 if (nd.ni_dvp == nd.ni_vp) 1731 vrele(nd.ni_dvp); 1732 else 1733 vput(nd.ni_dvp); 1734 if (nd.ni_vp) 1735 vrele(nd.ni_vp); 1736 return (EEXIST); 1737 } 1738 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1739 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1740 if (nd.ni_dvp == nd.ni_vp) 1741 vrele(nd.ni_dvp); 1742 else 1743 vput(nd.ni_dvp); 1744 if ((error = vn_start_write(NULL, &mp, 1745 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1746 return (error); 1747 goto restart; 1748 } 1749 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1750 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1751 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1752 vput(nd.ni_dvp); 1753 vn_finished_write(mp, 0); 1754 return (error); 1755 } 1756 1757 /* 1758 * Delete a name from the filesystem. 1759 */ 1760 /* ARGSUSED */ 1761 int 1762 sys_unlink(struct lwp *l, void *v, register_t *retval) 1763 { 1764 struct sys_unlink_args /* { 1765 syscallarg(const char *) path; 1766 } */ *uap = v; 1767 struct proc *p = l->l_proc; 1768 struct mount *mp; 1769 struct vnode *vp; 1770 int error; 1771 struct nameidata nd; 1772 1773 restart: 1774 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1775 SCARG(uap, path), l); 1776 if ((error = namei(&nd)) != 0) 1777 return (error); 1778 vp = nd.ni_vp; 1779 1780 /* 1781 * The root of a mounted filesystem cannot be deleted. 1782 */ 1783 if (vp->v_flag & VROOT) { 1784 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1785 if (nd.ni_dvp == vp) 1786 vrele(nd.ni_dvp); 1787 else 1788 vput(nd.ni_dvp); 1789 vput(vp); 1790 error = EBUSY; 1791 goto out; 1792 } 1793 1794 #ifdef VERIFIED_EXEC 1795 /* Handle remove requests for veriexec entries. */ 1796 if ((error = veriexec_removechk(l, vp, nd.ni_dirp)) != 0) { 1797 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1798 if (nd.ni_dvp == vp) 1799 vrele(nd.ni_dvp); 1800 else 1801 vput(nd.ni_dvp); 1802 vput(vp); 1803 goto out; 1804 } 1805 #endif /* VERIFIED_EXEC */ 1806 1807 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1808 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1809 if (nd.ni_dvp == vp) 1810 vrele(nd.ni_dvp); 1811 else 1812 vput(nd.ni_dvp); 1813 vput(vp); 1814 if ((error = vn_start_write(NULL, &mp, 1815 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1816 return (error); 1817 goto restart; 1818 } 1819 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 1820 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 1821 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1822 vn_finished_write(mp, 0); 1823 out: 1824 return (error); 1825 } 1826 1827 /* 1828 * Reposition read/write file offset. 1829 */ 1830 int 1831 sys_lseek(struct lwp *l, void *v, register_t *retval) 1832 { 1833 struct sys_lseek_args /* { 1834 syscallarg(int) fd; 1835 syscallarg(int) pad; 1836 syscallarg(off_t) offset; 1837 syscallarg(int) whence; 1838 } */ *uap = v; 1839 struct proc *p = l->l_proc; 1840 struct ucred *cred = p->p_ucred; 1841 struct filedesc *fdp = p->p_fd; 1842 struct file *fp; 1843 struct vnode *vp; 1844 struct vattr vattr; 1845 off_t newoff; 1846 int error; 1847 1848 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1849 return (EBADF); 1850 1851 FILE_USE(fp); 1852 1853 vp = (struct vnode *)fp->f_data; 1854 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1855 error = ESPIPE; 1856 goto out; 1857 } 1858 1859 switch (SCARG(uap, whence)) { 1860 case SEEK_CUR: 1861 newoff = fp->f_offset + SCARG(uap, offset); 1862 break; 1863 case SEEK_END: 1864 error = VOP_GETATTR(vp, &vattr, cred, l); 1865 if (error) 1866 goto out; 1867 newoff = SCARG(uap, offset) + vattr.va_size; 1868 break; 1869 case SEEK_SET: 1870 newoff = SCARG(uap, offset); 1871 break; 1872 default: 1873 error = EINVAL; 1874 goto out; 1875 } 1876 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1877 goto out; 1878 1879 *(off_t *)retval = fp->f_offset = newoff; 1880 out: 1881 FILE_UNUSE(fp, l); 1882 return (error); 1883 } 1884 1885 /* 1886 * Positional read system call. 1887 */ 1888 int 1889 sys_pread(struct lwp *l, void *v, register_t *retval) 1890 { 1891 struct sys_pread_args /* { 1892 syscallarg(int) fd; 1893 syscallarg(void *) buf; 1894 syscallarg(size_t) nbyte; 1895 syscallarg(off_t) offset; 1896 } */ *uap = v; 1897 struct proc *p = l->l_proc; 1898 struct filedesc *fdp = p->p_fd; 1899 struct file *fp; 1900 struct vnode *vp; 1901 off_t offset; 1902 int error, fd = SCARG(uap, fd); 1903 1904 if ((fp = fd_getfile(fdp, fd)) == NULL) 1905 return (EBADF); 1906 1907 if ((fp->f_flag & FREAD) == 0) { 1908 simple_unlock(&fp->f_slock); 1909 return (EBADF); 1910 } 1911 1912 FILE_USE(fp); 1913 1914 vp = (struct vnode *)fp->f_data; 1915 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1916 error = ESPIPE; 1917 goto out; 1918 } 1919 1920 offset = SCARG(uap, offset); 1921 1922 /* 1923 * XXX This works because no file systems actually 1924 * XXX take any action on the seek operation. 1925 */ 1926 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1927 goto out; 1928 1929 /* dofileread() will unuse the descriptor for us */ 1930 return (dofileread(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1931 &offset, 0, retval)); 1932 1933 out: 1934 FILE_UNUSE(fp, l); 1935 return (error); 1936 } 1937 1938 /* 1939 * Positional scatter read system call. 1940 */ 1941 int 1942 sys_preadv(struct lwp *l, void *v, register_t *retval) 1943 { 1944 struct sys_preadv_args /* { 1945 syscallarg(int) fd; 1946 syscallarg(const struct iovec *) iovp; 1947 syscallarg(int) iovcnt; 1948 syscallarg(off_t) offset; 1949 } */ *uap = v; 1950 struct proc *p = l->l_proc; 1951 struct filedesc *fdp = p->p_fd; 1952 struct file *fp; 1953 struct vnode *vp; 1954 off_t offset; 1955 int error, fd = SCARG(uap, fd); 1956 1957 if ((fp = fd_getfile(fdp, fd)) == NULL) 1958 return (EBADF); 1959 1960 if ((fp->f_flag & FREAD) == 0) { 1961 simple_unlock(&fp->f_slock); 1962 return (EBADF); 1963 } 1964 1965 FILE_USE(fp); 1966 1967 vp = (struct vnode *)fp->f_data; 1968 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1969 error = ESPIPE; 1970 goto out; 1971 } 1972 1973 offset = SCARG(uap, offset); 1974 1975 /* 1976 * XXX This works because no file systems actually 1977 * XXX take any action on the seek operation. 1978 */ 1979 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1980 goto out; 1981 1982 /* dofilereadv() will unuse the descriptor for us */ 1983 return (dofilereadv(l, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1984 &offset, 0, retval)); 1985 1986 out: 1987 FILE_UNUSE(fp, l); 1988 return (error); 1989 } 1990 1991 /* 1992 * Positional write system call. 1993 */ 1994 int 1995 sys_pwrite(struct lwp *l, void *v, register_t *retval) 1996 { 1997 struct sys_pwrite_args /* { 1998 syscallarg(int) fd; 1999 syscallarg(const void *) buf; 2000 syscallarg(size_t) nbyte; 2001 syscallarg(off_t) offset; 2002 } */ *uap = v; 2003 struct proc *p = l->l_proc; 2004 struct filedesc *fdp = p->p_fd; 2005 struct file *fp; 2006 struct vnode *vp; 2007 off_t offset; 2008 int error, fd = SCARG(uap, fd); 2009 2010 if ((fp = fd_getfile(fdp, fd)) == NULL) 2011 return (EBADF); 2012 2013 if ((fp->f_flag & FWRITE) == 0) { 2014 simple_unlock(&fp->f_slock); 2015 return (EBADF); 2016 } 2017 2018 FILE_USE(fp); 2019 2020 vp = (struct vnode *)fp->f_data; 2021 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2022 error = ESPIPE; 2023 goto out; 2024 } 2025 2026 offset = SCARG(uap, offset); 2027 2028 /* 2029 * XXX This works because no file systems actually 2030 * XXX take any action on the seek operation. 2031 */ 2032 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2033 goto out; 2034 2035 /* dofilewrite() will unuse the descriptor for us */ 2036 return (dofilewrite(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2037 &offset, 0, retval)); 2038 2039 out: 2040 FILE_UNUSE(fp, l); 2041 return (error); 2042 } 2043 2044 /* 2045 * Positional gather write system call. 2046 */ 2047 int 2048 sys_pwritev(struct lwp *l, void *v, register_t *retval) 2049 { 2050 struct sys_pwritev_args /* { 2051 syscallarg(int) fd; 2052 syscallarg(const struct iovec *) iovp; 2053 syscallarg(int) iovcnt; 2054 syscallarg(off_t) offset; 2055 } */ *uap = v; 2056 struct proc *p = l->l_proc; 2057 struct filedesc *fdp = p->p_fd; 2058 struct file *fp; 2059 struct vnode *vp; 2060 off_t offset; 2061 int error, fd = SCARG(uap, fd); 2062 2063 if ((fp = fd_getfile(fdp, fd)) == NULL) 2064 return (EBADF); 2065 2066 if ((fp->f_flag & FWRITE) == 0) { 2067 simple_unlock(&fp->f_slock); 2068 return (EBADF); 2069 } 2070 2071 FILE_USE(fp); 2072 2073 vp = (struct vnode *)fp->f_data; 2074 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2075 error = ESPIPE; 2076 goto out; 2077 } 2078 2079 offset = SCARG(uap, offset); 2080 2081 /* 2082 * XXX This works because no file systems actually 2083 * XXX take any action on the seek operation. 2084 */ 2085 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2086 goto out; 2087 2088 /* dofilewritev() will unuse the descriptor for us */ 2089 return (dofilewritev(l, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2090 &offset, 0, retval)); 2091 2092 out: 2093 FILE_UNUSE(fp, l); 2094 return (error); 2095 } 2096 2097 /* 2098 * Check access permissions. 2099 */ 2100 int 2101 sys_access(struct lwp *l, void *v, register_t *retval) 2102 { 2103 struct sys_access_args /* { 2104 syscallarg(const char *) path; 2105 syscallarg(int) flags; 2106 } */ *uap = v; 2107 struct proc *p = l->l_proc; 2108 struct ucred *cred; 2109 struct vnode *vp; 2110 int error, flags; 2111 struct nameidata nd; 2112 2113 cred = crdup(p->p_ucred); 2114 cred->cr_uid = p->p_cred->p_ruid; 2115 cred->cr_gid = p->p_cred->p_rgid; 2116 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2117 SCARG(uap, path), l); 2118 /* Override default credentials */ 2119 nd.ni_cnd.cn_cred = cred; 2120 if ((error = namei(&nd)) != 0) 2121 goto out; 2122 vp = nd.ni_vp; 2123 2124 /* Flags == 0 means only check for existence. */ 2125 if (SCARG(uap, flags)) { 2126 flags = 0; 2127 if (SCARG(uap, flags) & R_OK) 2128 flags |= VREAD; 2129 if (SCARG(uap, flags) & W_OK) 2130 flags |= VWRITE; 2131 if (SCARG(uap, flags) & X_OK) 2132 flags |= VEXEC; 2133 2134 error = VOP_ACCESS(vp, flags, cred, l); 2135 if (!error && (flags & VWRITE)) 2136 error = vn_writechk(vp); 2137 } 2138 vput(vp); 2139 out: 2140 crfree(cred); 2141 return (error); 2142 } 2143 2144 /* 2145 * Get file status; this version follows links. 2146 */ 2147 /* ARGSUSED */ 2148 int 2149 sys___stat30(struct lwp *l, void *v, register_t *retval) 2150 { 2151 struct sys___stat30_args /* { 2152 syscallarg(const char *) path; 2153 syscallarg(struct stat *) ub; 2154 } */ *uap = v; 2155 struct stat sb; 2156 int error; 2157 struct nameidata nd; 2158 2159 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2160 SCARG(uap, path), l); 2161 if ((error = namei(&nd)) != 0) 2162 return (error); 2163 error = vn_stat(nd.ni_vp, &sb, l); 2164 vput(nd.ni_vp); 2165 if (error) 2166 return (error); 2167 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2168 return (error); 2169 } 2170 2171 /* 2172 * Get file status; this version does not follow links. 2173 */ 2174 /* ARGSUSED */ 2175 int 2176 sys___lstat30(struct lwp *l, void *v, register_t *retval) 2177 { 2178 struct sys___lstat30_args /* { 2179 syscallarg(const char *) path; 2180 syscallarg(struct stat *) ub; 2181 } */ *uap = v; 2182 struct stat sb; 2183 int error; 2184 struct nameidata nd; 2185 2186 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2187 SCARG(uap, path), l); 2188 if ((error = namei(&nd)) != 0) 2189 return (error); 2190 error = vn_stat(nd.ni_vp, &sb, l); 2191 vput(nd.ni_vp); 2192 if (error) 2193 return (error); 2194 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2195 return (error); 2196 } 2197 2198 /* 2199 * Get configurable pathname variables. 2200 */ 2201 /* ARGSUSED */ 2202 int 2203 sys_pathconf(struct lwp *l, void *v, register_t *retval) 2204 { 2205 struct sys_pathconf_args /* { 2206 syscallarg(const char *) path; 2207 syscallarg(int) name; 2208 } */ *uap = v; 2209 int error; 2210 struct nameidata nd; 2211 2212 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2213 SCARG(uap, path), l); 2214 if ((error = namei(&nd)) != 0) 2215 return (error); 2216 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2217 vput(nd.ni_vp); 2218 return (error); 2219 } 2220 2221 /* 2222 * Return target name of a symbolic link. 2223 */ 2224 /* ARGSUSED */ 2225 int 2226 sys_readlink(struct lwp *l, void *v, register_t *retval) 2227 { 2228 struct sys_readlink_args /* { 2229 syscallarg(const char *) path; 2230 syscallarg(char *) buf; 2231 syscallarg(size_t) count; 2232 } */ *uap = v; 2233 struct proc *p = l->l_proc; 2234 struct vnode *vp; 2235 struct iovec aiov; 2236 struct uio auio; 2237 int error; 2238 struct nameidata nd; 2239 2240 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2241 SCARG(uap, path), l); 2242 if ((error = namei(&nd)) != 0) 2243 return (error); 2244 vp = nd.ni_vp; 2245 if (vp->v_type != VLNK) 2246 error = EINVAL; 2247 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2248 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, l)) == 0) { 2249 aiov.iov_base = SCARG(uap, buf); 2250 aiov.iov_len = SCARG(uap, count); 2251 auio.uio_iov = &aiov; 2252 auio.uio_iovcnt = 1; 2253 auio.uio_offset = 0; 2254 auio.uio_rw = UIO_READ; 2255 auio.uio_segflg = UIO_USERSPACE; 2256 auio.uio_lwp = l; 2257 auio.uio_resid = SCARG(uap, count); 2258 error = VOP_READLINK(vp, &auio, p->p_ucred); 2259 } 2260 vput(vp); 2261 *retval = SCARG(uap, count) - auio.uio_resid; 2262 return (error); 2263 } 2264 2265 /* 2266 * Change flags of a file given a path name. 2267 */ 2268 /* ARGSUSED */ 2269 int 2270 sys_chflags(struct lwp *l, void *v, register_t *retval) 2271 { 2272 struct sys_chflags_args /* { 2273 syscallarg(const char *) path; 2274 syscallarg(u_long) flags; 2275 } */ *uap = v; 2276 struct vnode *vp; 2277 int error; 2278 struct nameidata nd; 2279 2280 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2281 if ((error = namei(&nd)) != 0) 2282 return (error); 2283 vp = nd.ni_vp; 2284 error = change_flags(vp, SCARG(uap, flags), l); 2285 vput(vp); 2286 return (error); 2287 } 2288 2289 /* 2290 * Change flags of a file given a file descriptor. 2291 */ 2292 /* ARGSUSED */ 2293 int 2294 sys_fchflags(struct lwp *l, void *v, register_t *retval) 2295 { 2296 struct sys_fchflags_args /* { 2297 syscallarg(int) fd; 2298 syscallarg(u_long) flags; 2299 } */ *uap = v; 2300 struct proc *p = l->l_proc; 2301 struct vnode *vp; 2302 struct file *fp; 2303 int error; 2304 2305 /* getvnode() will use the descriptor for us */ 2306 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2307 return (error); 2308 vp = (struct vnode *)fp->f_data; 2309 error = change_flags(vp, SCARG(uap, flags), l); 2310 VOP_UNLOCK(vp, 0); 2311 FILE_UNUSE(fp, l); 2312 return (error); 2313 } 2314 2315 /* 2316 * Change flags of a file given a path name; this version does 2317 * not follow links. 2318 */ 2319 int 2320 sys_lchflags(struct lwp *l, void *v, register_t *retval) 2321 { 2322 struct sys_lchflags_args /* { 2323 syscallarg(const char *) path; 2324 syscallarg(u_long) flags; 2325 } */ *uap = v; 2326 struct vnode *vp; 2327 int error; 2328 struct nameidata nd; 2329 2330 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2331 if ((error = namei(&nd)) != 0) 2332 return (error); 2333 vp = nd.ni_vp; 2334 error = change_flags(vp, SCARG(uap, flags), l); 2335 vput(vp); 2336 return (error); 2337 } 2338 2339 /* 2340 * Common routine to change flags of a file. 2341 */ 2342 int 2343 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 2344 { 2345 struct proc *p = l->l_proc; 2346 struct mount *mp; 2347 struct vattr vattr; 2348 int error; 2349 2350 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2351 return (error); 2352 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2353 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2354 /* 2355 * Non-superusers cannot change the flags on devices, even if they 2356 * own them. 2357 */ 2358 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2359 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, l)) != 0) 2360 goto out; 2361 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2362 error = EINVAL; 2363 goto out; 2364 } 2365 } 2366 VATTR_NULL(&vattr); 2367 vattr.va_flags = flags; 2368 error = VOP_SETATTR(vp, &vattr, p->p_ucred, l); 2369 out: 2370 vn_finished_write(mp, 0); 2371 return (error); 2372 } 2373 2374 /* 2375 * Change mode of a file given path name; this version follows links. 2376 */ 2377 /* ARGSUSED */ 2378 int 2379 sys_chmod(struct lwp *l, void *v, register_t *retval) 2380 { 2381 struct sys_chmod_args /* { 2382 syscallarg(const char *) path; 2383 syscallarg(int) mode; 2384 } */ *uap = v; 2385 int error; 2386 struct nameidata nd; 2387 2388 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2389 if ((error = namei(&nd)) != 0) 2390 return (error); 2391 2392 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2393 2394 vrele(nd.ni_vp); 2395 return (error); 2396 } 2397 2398 /* 2399 * Change mode of a file given a file descriptor. 2400 */ 2401 /* ARGSUSED */ 2402 int 2403 sys_fchmod(struct lwp *l, void *v, register_t *retval) 2404 { 2405 struct sys_fchmod_args /* { 2406 syscallarg(int) fd; 2407 syscallarg(int) mode; 2408 } */ *uap = v; 2409 struct proc *p = l->l_proc; 2410 struct file *fp; 2411 int error; 2412 2413 /* getvnode() will use the descriptor for us */ 2414 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2415 return (error); 2416 2417 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), l); 2418 FILE_UNUSE(fp, l); 2419 return (error); 2420 } 2421 2422 /* 2423 * Change mode of a file given path name; this version does not follow links. 2424 */ 2425 /* ARGSUSED */ 2426 int 2427 sys_lchmod(struct lwp *l, void *v, register_t *retval) 2428 { 2429 struct sys_lchmod_args /* { 2430 syscallarg(const char *) path; 2431 syscallarg(int) mode; 2432 } */ *uap = v; 2433 int error; 2434 struct nameidata nd; 2435 2436 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2437 if ((error = namei(&nd)) != 0) 2438 return (error); 2439 2440 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2441 2442 vrele(nd.ni_vp); 2443 return (error); 2444 } 2445 2446 /* 2447 * Common routine to set mode given a vnode. 2448 */ 2449 static int 2450 change_mode(struct vnode *vp, int mode, struct lwp *l) 2451 { 2452 struct proc *p = l->l_proc; 2453 struct mount *mp; 2454 struct vattr vattr; 2455 int error; 2456 2457 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2458 return (error); 2459 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2460 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2461 VATTR_NULL(&vattr); 2462 vattr.va_mode = mode & ALLPERMS; 2463 error = VOP_SETATTR(vp, &vattr, p->p_ucred, l); 2464 VOP_UNLOCK(vp, 0); 2465 vn_finished_write(mp, 0); 2466 return (error); 2467 } 2468 2469 /* 2470 * Set ownership given a path name; this version follows links. 2471 */ 2472 /* ARGSUSED */ 2473 int 2474 sys_chown(struct lwp *l, void *v, register_t *retval) 2475 { 2476 struct sys_chown_args /* { 2477 syscallarg(const char *) path; 2478 syscallarg(uid_t) uid; 2479 syscallarg(gid_t) gid; 2480 } */ *uap = v; 2481 int error; 2482 struct nameidata nd; 2483 2484 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2485 if ((error = namei(&nd)) != 0) 2486 return (error); 2487 2488 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2489 2490 vrele(nd.ni_vp); 2491 return (error); 2492 } 2493 2494 /* 2495 * Set ownership given a path name; this version follows links. 2496 * Provides POSIX semantics. 2497 */ 2498 /* ARGSUSED */ 2499 int 2500 sys___posix_chown(struct lwp *l, void *v, register_t *retval) 2501 { 2502 struct sys_chown_args /* { 2503 syscallarg(const char *) path; 2504 syscallarg(uid_t) uid; 2505 syscallarg(gid_t) gid; 2506 } */ *uap = v; 2507 int error; 2508 struct nameidata nd; 2509 2510 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2511 if ((error = namei(&nd)) != 0) 2512 return (error); 2513 2514 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2515 2516 vrele(nd.ni_vp); 2517 return (error); 2518 } 2519 2520 /* 2521 * Set ownership given a file descriptor. 2522 */ 2523 /* ARGSUSED */ 2524 int 2525 sys_fchown(struct lwp *l, void *v, register_t *retval) 2526 { 2527 struct sys_fchown_args /* { 2528 syscallarg(int) fd; 2529 syscallarg(uid_t) uid; 2530 syscallarg(gid_t) gid; 2531 } */ *uap = v; 2532 struct proc *p = l->l_proc; 2533 int error; 2534 struct file *fp; 2535 2536 /* getvnode() will use the descriptor for us */ 2537 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2538 return (error); 2539 2540 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2541 SCARG(uap, gid), l, 0); 2542 FILE_UNUSE(fp, l); 2543 return (error); 2544 } 2545 2546 /* 2547 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2548 */ 2549 /* ARGSUSED */ 2550 int 2551 sys___posix_fchown(struct lwp *l, void *v, register_t *retval) 2552 { 2553 struct sys_fchown_args /* { 2554 syscallarg(int) fd; 2555 syscallarg(uid_t) uid; 2556 syscallarg(gid_t) gid; 2557 } */ *uap = v; 2558 struct proc *p = l->l_proc; 2559 int error; 2560 struct file *fp; 2561 2562 /* getvnode() will use the descriptor for us */ 2563 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2564 return (error); 2565 2566 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2567 SCARG(uap, gid), l, 1); 2568 FILE_UNUSE(fp, l); 2569 return (error); 2570 } 2571 2572 /* 2573 * Set ownership given a path name; this version does not follow links. 2574 */ 2575 /* ARGSUSED */ 2576 int 2577 sys_lchown(struct lwp *l, void *v, register_t *retval) 2578 { 2579 struct sys_lchown_args /* { 2580 syscallarg(const char *) path; 2581 syscallarg(uid_t) uid; 2582 syscallarg(gid_t) gid; 2583 } */ *uap = v; 2584 int error; 2585 struct nameidata nd; 2586 2587 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2588 if ((error = namei(&nd)) != 0) 2589 return (error); 2590 2591 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2592 2593 vrele(nd.ni_vp); 2594 return (error); 2595 } 2596 2597 /* 2598 * Set ownership given a path name; this version does not follow links. 2599 * Provides POSIX/XPG semantics. 2600 */ 2601 /* ARGSUSED */ 2602 int 2603 sys___posix_lchown(struct lwp *l, void *v, register_t *retval) 2604 { 2605 struct sys_lchown_args /* { 2606 syscallarg(const char *) path; 2607 syscallarg(uid_t) uid; 2608 syscallarg(gid_t) gid; 2609 } */ *uap = v; 2610 int error; 2611 struct nameidata nd; 2612 2613 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2614 if ((error = namei(&nd)) != 0) 2615 return (error); 2616 2617 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2618 2619 vrele(nd.ni_vp); 2620 return (error); 2621 } 2622 2623 /* 2624 * Common routine to set ownership given a vnode. 2625 */ 2626 static int 2627 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 2628 int posix_semantics) 2629 { 2630 struct proc *p = l->l_proc; 2631 struct mount *mp; 2632 struct vattr vattr; 2633 mode_t newmode; 2634 int error; 2635 2636 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2637 return (error); 2638 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2639 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2640 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, l)) != 0) 2641 goto out; 2642 2643 #define CHANGED(x) ((int)(x) != -1) 2644 newmode = vattr.va_mode; 2645 if (posix_semantics) { 2646 /* 2647 * POSIX/XPG semantics: if the caller is not the super-user, 2648 * clear set-user-id and set-group-id bits. Both POSIX and 2649 * the XPG consider the behaviour for calls by the super-user 2650 * implementation-defined; we leave the set-user-id and set- 2651 * group-id settings intact in that case. 2652 */ 2653 if (suser(p->p_ucred, NULL) != 0) 2654 newmode &= ~(S_ISUID | S_ISGID); 2655 } else { 2656 /* 2657 * NetBSD semantics: when changing owner and/or group, 2658 * clear the respective bit(s). 2659 */ 2660 if (CHANGED(uid)) 2661 newmode &= ~S_ISUID; 2662 if (CHANGED(gid)) 2663 newmode &= ~S_ISGID; 2664 } 2665 /* Update va_mode iff altered. */ 2666 if (vattr.va_mode == newmode) 2667 newmode = VNOVAL; 2668 2669 VATTR_NULL(&vattr); 2670 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2671 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2672 vattr.va_mode = newmode; 2673 error = VOP_SETATTR(vp, &vattr, p->p_ucred, l); 2674 #undef CHANGED 2675 2676 out: 2677 VOP_UNLOCK(vp, 0); 2678 vn_finished_write(mp, 0); 2679 return (error); 2680 } 2681 2682 /* 2683 * Set the access and modification times given a path name; this 2684 * version follows links. 2685 */ 2686 /* ARGSUSED */ 2687 int 2688 sys_utimes(struct lwp *l, void *v, register_t *retval) 2689 { 2690 struct sys_utimes_args /* { 2691 syscallarg(const char *) path; 2692 syscallarg(const struct timeval *) tptr; 2693 } */ *uap = v; 2694 int error; 2695 struct nameidata nd; 2696 2697 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2698 if ((error = namei(&nd)) != 0) 2699 return (error); 2700 2701 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), l); 2702 2703 vrele(nd.ni_vp); 2704 return (error); 2705 } 2706 2707 /* 2708 * Set the access and modification times given a file descriptor. 2709 */ 2710 /* ARGSUSED */ 2711 int 2712 sys_futimes(struct lwp *l, void *v, register_t *retval) 2713 { 2714 struct sys_futimes_args /* { 2715 syscallarg(int) fd; 2716 syscallarg(const struct timeval *) tptr; 2717 } */ *uap = v; 2718 struct proc *p = l->l_proc; 2719 int error; 2720 struct file *fp; 2721 2722 /* getvnode() will use the descriptor for us */ 2723 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2724 return (error); 2725 2726 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), l); 2727 FILE_UNUSE(fp, l); 2728 return (error); 2729 } 2730 2731 /* 2732 * Set the access and modification times given a path name; this 2733 * version does not follow links. 2734 */ 2735 /* ARGSUSED */ 2736 int 2737 sys_lutimes(struct lwp *l, void *v, register_t *retval) 2738 { 2739 struct sys_lutimes_args /* { 2740 syscallarg(const char *) path; 2741 syscallarg(const struct timeval *) tptr; 2742 } */ *uap = v; 2743 int error; 2744 struct nameidata nd; 2745 2746 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2747 if ((error = namei(&nd)) != 0) 2748 return (error); 2749 2750 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), l); 2751 2752 vrele(nd.ni_vp); 2753 return (error); 2754 } 2755 2756 /* 2757 * Common routine to set access and modification times given a vnode. 2758 */ 2759 static int 2760 change_utimes(struct vnode *vp, const struct timeval *tptr, struct lwp *l) 2761 { 2762 struct proc *p = l->l_proc; 2763 struct mount *mp; 2764 struct vattr vattr; 2765 int error; 2766 2767 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2768 return (error); 2769 VATTR_NULL(&vattr); 2770 if (tptr == NULL) { 2771 nanotime(&vattr.va_atime); 2772 vattr.va_mtime = vattr.va_atime; 2773 vattr.va_vaflags |= VA_UTIMES_NULL; 2774 } else { 2775 struct timeval tv[2]; 2776 2777 error = copyin(tptr, tv, sizeof(tv)); 2778 if (error) 2779 goto out; 2780 TIMEVAL_TO_TIMESPEC(&tv[0], &vattr.va_atime); 2781 TIMEVAL_TO_TIMESPEC(&tv[1], &vattr.va_mtime); 2782 } 2783 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2784 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2785 error = VOP_SETATTR(vp, &vattr, p->p_ucred, l); 2786 VOP_UNLOCK(vp, 0); 2787 out: 2788 vn_finished_write(mp, 0); 2789 return (error); 2790 } 2791 2792 /* 2793 * Truncate a file given its path name. 2794 */ 2795 /* ARGSUSED */ 2796 int 2797 sys_truncate(struct lwp *l, void *v, register_t *retval) 2798 { 2799 struct sys_truncate_args /* { 2800 syscallarg(const char *) path; 2801 syscallarg(int) pad; 2802 syscallarg(off_t) length; 2803 } */ *uap = v; 2804 struct proc *p = l->l_proc; 2805 struct vnode *vp; 2806 struct mount *mp; 2807 struct vattr vattr; 2808 int error; 2809 struct nameidata nd; 2810 2811 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2812 if ((error = namei(&nd)) != 0) 2813 return (error); 2814 vp = nd.ni_vp; 2815 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2816 vrele(vp); 2817 return (error); 2818 } 2819 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2820 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2821 if (vp->v_type == VDIR) 2822 error = EISDIR; 2823 else if ((error = vn_writechk(vp)) == 0 && 2824 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, l)) == 0) { 2825 VATTR_NULL(&vattr); 2826 vattr.va_size = SCARG(uap, length); 2827 error = VOP_SETATTR(vp, &vattr, p->p_ucred, l); 2828 } 2829 vput(vp); 2830 vn_finished_write(mp, 0); 2831 return (error); 2832 } 2833 2834 /* 2835 * Truncate a file given a file descriptor. 2836 */ 2837 /* ARGSUSED */ 2838 int 2839 sys_ftruncate(struct lwp *l, void *v, register_t *retval) 2840 { 2841 struct sys_ftruncate_args /* { 2842 syscallarg(int) fd; 2843 syscallarg(int) pad; 2844 syscallarg(off_t) length; 2845 } */ *uap = v; 2846 struct proc *p = l->l_proc; 2847 struct mount *mp; 2848 struct vattr vattr; 2849 struct vnode *vp; 2850 struct file *fp; 2851 int error; 2852 2853 /* getvnode() will use the descriptor for us */ 2854 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2855 return (error); 2856 if ((fp->f_flag & FWRITE) == 0) { 2857 error = EINVAL; 2858 goto out; 2859 } 2860 vp = (struct vnode *)fp->f_data; 2861 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2862 FILE_UNUSE(fp, l); 2863 return (error); 2864 } 2865 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 2866 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2867 if (vp->v_type == VDIR) 2868 error = EISDIR; 2869 else if ((error = vn_writechk(vp)) == 0) { 2870 VATTR_NULL(&vattr); 2871 vattr.va_size = SCARG(uap, length); 2872 error = VOP_SETATTR(vp, &vattr, fp->f_cred, l); 2873 } 2874 VOP_UNLOCK(vp, 0); 2875 vn_finished_write(mp, 0); 2876 out: 2877 FILE_UNUSE(fp, l); 2878 return (error); 2879 } 2880 2881 /* 2882 * Sync an open file. 2883 */ 2884 /* ARGSUSED */ 2885 int 2886 sys_fsync(struct lwp *l, void *v, register_t *retval) 2887 { 2888 struct sys_fsync_args /* { 2889 syscallarg(int) fd; 2890 } */ *uap = v; 2891 struct proc *p = l->l_proc; 2892 struct vnode *vp; 2893 struct mount *mp; 2894 struct file *fp; 2895 int error; 2896 2897 /* getvnode() will use the descriptor for us */ 2898 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2899 return (error); 2900 vp = (struct vnode *)fp->f_data; 2901 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2902 FILE_UNUSE(fp, l); 2903 return (error); 2904 } 2905 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2906 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, l); 2907 if (error == 0 && bioops.io_fsync != NULL && 2908 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2909 (*bioops.io_fsync)(vp, 0); 2910 VOP_UNLOCK(vp, 0); 2911 vn_finished_write(mp, 0); 2912 FILE_UNUSE(fp, l); 2913 return (error); 2914 } 2915 2916 /* 2917 * Sync a range of file data. API modeled after that found in AIX. 2918 * 2919 * FDATASYNC indicates that we need only save enough metadata to be able 2920 * to re-read the written data. Note we duplicate AIX's requirement that 2921 * the file be open for writing. 2922 */ 2923 /* ARGSUSED */ 2924 int 2925 sys_fsync_range(struct lwp *l, void *v, register_t *retval) 2926 { 2927 struct sys_fsync_range_args /* { 2928 syscallarg(int) fd; 2929 syscallarg(int) flags; 2930 syscallarg(off_t) start; 2931 syscallarg(off_t) length; 2932 } */ *uap = v; 2933 struct proc *p = l->l_proc; 2934 struct vnode *vp; 2935 struct file *fp; 2936 int flags, nflags; 2937 off_t s, e, len; 2938 int error; 2939 2940 /* getvnode() will use the descriptor for us */ 2941 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2942 return (error); 2943 2944 if ((fp->f_flag & FWRITE) == 0) { 2945 FILE_UNUSE(fp, l); 2946 return (EBADF); 2947 } 2948 2949 flags = SCARG(uap, flags); 2950 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 2951 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 2952 return (EINVAL); 2953 } 2954 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 2955 if (flags & FDATASYNC) 2956 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 2957 else 2958 nflags = FSYNC_WAIT; 2959 if (flags & FDISKSYNC) 2960 nflags |= FSYNC_CACHE; 2961 2962 len = SCARG(uap, length); 2963 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 2964 if (len) { 2965 s = SCARG(uap, start); 2966 e = s + len; 2967 if (e < s) { 2968 FILE_UNUSE(fp, l); 2969 return (EINVAL); 2970 } 2971 } else { 2972 e = 0; 2973 s = 0; 2974 } 2975 2976 vp = (struct vnode *)fp->f_data; 2977 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2978 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, l); 2979 2980 if (error == 0 && bioops.io_fsync != NULL && 2981 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2982 (*bioops.io_fsync)(vp, nflags); 2983 2984 VOP_UNLOCK(vp, 0); 2985 FILE_UNUSE(fp, l); 2986 return (error); 2987 } 2988 2989 /* 2990 * Sync the data of an open file. 2991 */ 2992 /* ARGSUSED */ 2993 int 2994 sys_fdatasync(struct lwp *l, void *v, register_t *retval) 2995 { 2996 struct sys_fdatasync_args /* { 2997 syscallarg(int) fd; 2998 } */ *uap = v; 2999 struct proc *p = l->l_proc; 3000 struct vnode *vp; 3001 struct file *fp; 3002 int error; 3003 3004 /* getvnode() will use the descriptor for us */ 3005 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3006 return (error); 3007 if ((fp->f_flag & FWRITE) == 0) { 3008 FILE_UNUSE(fp, l); 3009 return (EBADF); 3010 } 3011 vp = (struct vnode *)fp->f_data; 3012 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3013 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, l); 3014 VOP_UNLOCK(vp, 0); 3015 FILE_UNUSE(fp, l); 3016 return (error); 3017 } 3018 3019 /* 3020 * Rename files, (standard) BSD semantics frontend. 3021 */ 3022 /* ARGSUSED */ 3023 int 3024 sys_rename(struct lwp *l, void *v, register_t *retval) 3025 { 3026 struct sys_rename_args /* { 3027 syscallarg(const char *) from; 3028 syscallarg(const char *) to; 3029 } */ *uap = v; 3030 3031 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 0)); 3032 } 3033 3034 /* 3035 * Rename files, POSIX semantics frontend. 3036 */ 3037 /* ARGSUSED */ 3038 int 3039 sys___posix_rename(struct lwp *l, void *v, register_t *retval) 3040 { 3041 struct sys___posix_rename_args /* { 3042 syscallarg(const char *) from; 3043 syscallarg(const char *) to; 3044 } */ *uap = v; 3045 3046 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 1)); 3047 } 3048 3049 /* 3050 * Rename files. Source and destination must either both be directories, 3051 * or both not be directories. If target is a directory, it must be empty. 3052 * If `from' and `to' refer to the same object, the value of the `retain' 3053 * argument is used to determine whether `from' will be 3054 * 3055 * (retain == 0) deleted unless `from' and `to' refer to the same 3056 * object in the file system's name space (BSD). 3057 * (retain == 1) always retained (POSIX). 3058 */ 3059 static int 3060 rename_files(const char *from, const char *to, struct lwp *l, int retain) 3061 { 3062 struct mount *mp = NULL; 3063 struct vnode *tvp, *fvp, *tdvp; 3064 struct nameidata fromnd, tond; 3065 struct proc *p; 3066 int error; 3067 3068 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 3069 from, l); 3070 if ((error = namei(&fromnd)) != 0) 3071 return (error); 3072 fvp = fromnd.ni_vp; 3073 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3074 if (error != 0) { 3075 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3076 vrele(fromnd.ni_dvp); 3077 vrele(fvp); 3078 if (fromnd.ni_startdir) 3079 vrele(fromnd.ni_startdir); 3080 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3081 return (error); 3082 } 3083 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3084 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, l); 3085 if ((error = namei(&tond)) != 0) { 3086 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3087 vrele(fromnd.ni_dvp); 3088 vrele(fvp); 3089 goto out1; 3090 } 3091 tdvp = tond.ni_dvp; 3092 tvp = tond.ni_vp; 3093 3094 if (tvp != NULL) { 3095 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3096 error = ENOTDIR; 3097 goto out; 3098 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3099 error = EISDIR; 3100 goto out; 3101 } 3102 } 3103 3104 if (fvp == tdvp) 3105 error = EINVAL; 3106 3107 /* 3108 * Source and destination refer to the same object. 3109 */ 3110 if (fvp == tvp) { 3111 if (retain) 3112 error = -1; 3113 else if (fromnd.ni_dvp == tdvp && 3114 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3115 !memcmp(fromnd.ni_cnd.cn_nameptr, 3116 tond.ni_cnd.cn_nameptr, 3117 fromnd.ni_cnd.cn_namelen)) 3118 error = -1; 3119 } 3120 3121 #ifdef VERIFIED_EXEC 3122 if (!error) 3123 error = veriexec_renamechk(fvp, fromnd.ni_dirp, tond.ni_dirp, l); 3124 #endif /* VERIFIED_EXEC */ 3125 3126 out: 3127 p = l->l_proc; 3128 if (!error) { 3129 VOP_LEASE(tdvp, l, p->p_ucred, LEASE_WRITE); 3130 if (fromnd.ni_dvp != tdvp) 3131 VOP_LEASE(fromnd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 3132 if (tvp) { 3133 VOP_LEASE(tvp, l, p->p_ucred, LEASE_WRITE); 3134 } 3135 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3136 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3137 } else { 3138 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3139 if (tdvp == tvp) 3140 vrele(tdvp); 3141 else 3142 vput(tdvp); 3143 if (tvp) 3144 vput(tvp); 3145 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3146 vrele(fromnd.ni_dvp); 3147 vrele(fvp); 3148 } 3149 vrele(tond.ni_startdir); 3150 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3151 out1: 3152 vn_finished_write(mp, 0); 3153 if (fromnd.ni_startdir) 3154 vrele(fromnd.ni_startdir); 3155 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3156 return (error == -1 ? 0 : error); 3157 } 3158 3159 /* 3160 * Make a directory file. 3161 */ 3162 /* ARGSUSED */ 3163 int 3164 sys_mkdir(struct lwp *l, void *v, register_t *retval) 3165 { 3166 struct sys_mkdir_args /* { 3167 syscallarg(const char *) path; 3168 syscallarg(int) mode; 3169 } */ *uap = v; 3170 struct proc *p = l->l_proc; 3171 struct mount *mp; 3172 struct vnode *vp; 3173 struct vattr vattr; 3174 int error; 3175 struct nameidata nd; 3176 3177 restart: 3178 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3179 SCARG(uap, path), l); 3180 if ((error = namei(&nd)) != 0) 3181 return (error); 3182 vp = nd.ni_vp; 3183 if (vp != NULL) { 3184 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3185 if (nd.ni_dvp == vp) 3186 vrele(nd.ni_dvp); 3187 else 3188 vput(nd.ni_dvp); 3189 vrele(vp); 3190 return (EEXIST); 3191 } 3192 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3193 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3194 if (nd.ni_dvp == vp) 3195 vrele(nd.ni_dvp); 3196 else 3197 vput(nd.ni_dvp); 3198 if ((error = vn_start_write(NULL, &mp, 3199 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3200 return (error); 3201 goto restart; 3202 } 3203 VATTR_NULL(&vattr); 3204 vattr.va_type = VDIR; 3205 vattr.va_mode = 3206 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3207 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 3208 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3209 if (!error) 3210 vput(nd.ni_vp); 3211 vn_finished_write(mp, 0); 3212 return (error); 3213 } 3214 3215 /* 3216 * Remove a directory file. 3217 */ 3218 /* ARGSUSED */ 3219 int 3220 sys_rmdir(struct lwp *l, void *v, register_t *retval) 3221 { 3222 struct sys_rmdir_args /* { 3223 syscallarg(const char *) path; 3224 } */ *uap = v; 3225 struct proc *p = l->l_proc; 3226 struct mount *mp; 3227 struct vnode *vp; 3228 int error; 3229 struct nameidata nd; 3230 3231 restart: 3232 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3233 SCARG(uap, path), l); 3234 if ((error = namei(&nd)) != 0) 3235 return (error); 3236 vp = nd.ni_vp; 3237 if (vp->v_type != VDIR) { 3238 error = ENOTDIR; 3239 goto out; 3240 } 3241 /* 3242 * No rmdir "." please. 3243 */ 3244 if (nd.ni_dvp == vp) { 3245 error = EINVAL; 3246 goto out; 3247 } 3248 /* 3249 * The root of a mounted filesystem cannot be deleted. 3250 */ 3251 if (vp->v_flag & VROOT) { 3252 error = EBUSY; 3253 goto out; 3254 } 3255 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3256 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3257 if (nd.ni_dvp == vp) 3258 vrele(nd.ni_dvp); 3259 else 3260 vput(nd.ni_dvp); 3261 vput(vp); 3262 if ((error = vn_start_write(NULL, &mp, 3263 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3264 return (error); 3265 goto restart; 3266 } 3267 VOP_LEASE(nd.ni_dvp, l, p->p_ucred, LEASE_WRITE); 3268 VOP_LEASE(vp, l, p->p_ucred, LEASE_WRITE); 3269 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3270 vn_finished_write(mp, 0); 3271 return (error); 3272 3273 out: 3274 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3275 if (nd.ni_dvp == vp) 3276 vrele(nd.ni_dvp); 3277 else 3278 vput(nd.ni_dvp); 3279 vput(vp); 3280 return (error); 3281 } 3282 3283 /* 3284 * Read a block of directory entries in a file system independent format. 3285 */ 3286 int 3287 sys___getdents30(struct lwp *l, void *v, register_t *retval) 3288 { 3289 struct sys___getdents30_args /* { 3290 syscallarg(int) fd; 3291 syscallarg(char *) buf; 3292 syscallarg(size_t) count; 3293 } */ *uap = v; 3294 struct proc *p = l->l_proc; 3295 struct file *fp; 3296 int error, done; 3297 3298 /* getvnode() will use the descriptor for us */ 3299 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3300 return (error); 3301 if ((fp->f_flag & FREAD) == 0) { 3302 error = EBADF; 3303 goto out; 3304 } 3305 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3306 SCARG(uap, count), &done, l, 0, 0); 3307 #ifdef KTRACE 3308 if (!error && KTRPOINT(p, KTR_GENIO)) { 3309 struct iovec iov; 3310 iov.iov_base = SCARG(uap, buf); 3311 iov.iov_len = done; 3312 ktrgenio(l, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3313 } 3314 #endif 3315 *retval = done; 3316 out: 3317 FILE_UNUSE(fp, l); 3318 return (error); 3319 } 3320 3321 /* 3322 * Set the mode mask for creation of filesystem nodes. 3323 */ 3324 int 3325 sys_umask(struct lwp *l, void *v, register_t *retval) 3326 { 3327 struct sys_umask_args /* { 3328 syscallarg(mode_t) newmask; 3329 } */ *uap = v; 3330 struct proc *p = l->l_proc; 3331 struct cwdinfo *cwdi; 3332 3333 cwdi = p->p_cwdi; 3334 *retval = cwdi->cwdi_cmask; 3335 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3336 return (0); 3337 } 3338 3339 /* 3340 * Void all references to file by ripping underlying filesystem 3341 * away from vnode. 3342 */ 3343 /* ARGSUSED */ 3344 int 3345 sys_revoke(struct lwp *l, void *v, register_t *retval) 3346 { 3347 struct sys_revoke_args /* { 3348 syscallarg(const char *) path; 3349 } */ *uap = v; 3350 struct proc *p = l->l_proc; 3351 struct mount *mp; 3352 struct vnode *vp; 3353 struct vattr vattr; 3354 int error; 3355 struct nameidata nd; 3356 3357 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 3358 if ((error = namei(&nd)) != 0) 3359 return (error); 3360 vp = nd.ni_vp; 3361 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, l)) != 0) 3362 goto out; 3363 if (p->p_ucred->cr_uid != vattr.va_uid && 3364 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3365 goto out; 3366 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3367 goto out; 3368 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3369 VOP_REVOKE(vp, REVOKEALL); 3370 vn_finished_write(mp, 0); 3371 out: 3372 vrele(vp); 3373 return (error); 3374 } 3375 3376 /* 3377 * Convert a user file descriptor to a kernel file entry. 3378 */ 3379 int 3380 getvnode(struct filedesc *fdp, int fd, struct file **fpp) 3381 { 3382 struct vnode *vp; 3383 struct file *fp; 3384 3385 if ((fp = fd_getfile(fdp, fd)) == NULL) 3386 return (EBADF); 3387 3388 FILE_USE(fp); 3389 3390 if (fp->f_type != DTYPE_VNODE) { 3391 FILE_UNUSE(fp, NULL); 3392 return (EINVAL); 3393 } 3394 3395 vp = (struct vnode *)fp->f_data; 3396 if (vp->v_type == VBAD) { 3397 FILE_UNUSE(fp, NULL); 3398 return (EBADF); 3399 } 3400 3401 *fpp = fp; 3402 return (0); 3403 } 3404
Indexes created Tue Sep 23 14:10:03 GMT 2025