vfs_syscalls.c revision 1.205
1 /* $NetBSD: vfs_syscalls.c,v 1.205 2004/03/23 13:22:33 junyoung 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 1.205 2004/03/23 13:22:33 junyoung Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_ktrace.h" 45 #include "fss.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/filedesc.h> 51 #include <sys/kernel.h> 52 #include <sys/file.h> 53 #include <sys/stat.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/proc.h> 57 #include <sys/uio.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 #include <sys/sysctl.h> 61 #include <sys/sa.h> 62 #include <sys/syscallargs.h> 63 #ifdef KTRACE 64 #include <sys/ktrace.h> 65 #endif 66 67 #include <miscfs/genfs/genfs.h> 68 #include <miscfs/syncfs/syncfs.h> 69 70 #if NFSS > 0 71 #include <dev/fssvar.h> 72 #endif 73 74 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 75 76 static int change_dir(struct nameidata *, struct proc *); 77 static int change_flags(struct vnode *, u_long, struct proc *); 78 static int change_mode(struct vnode *, int, struct proc *p); 79 static int change_owner(struct vnode *, uid_t, gid_t, struct proc *, int); 80 static int change_utimes(struct vnode *vp, const struct timeval *, 81 struct proc *p); 82 static int rename_files(const char *, const char *, struct proc *, int); 83 static int dostatfs(struct mount *, struct statfs *, struct proc *, int, int); 84 85 void checkdirs(struct vnode *); 86 87 int dovfsusermount = 0; 88 89 /* 90 * Virtual File System System Calls 91 */ 92 93 /* 94 * Mount a file system. 95 */ 96 97 #if defined(COMPAT_09) || defined(COMPAT_43) 98 /* 99 * This table is used to maintain compatibility with 4.3BSD 100 * and NetBSD 0.9 mount syscalls. Note, the order is important! 101 * 102 * Do not modify this table. It should only contain filesystems 103 * supported by NetBSD 0.9 and 4.3BSD. 104 */ 105 const char * const mountcompatnames[] = { 106 NULL, /* 0 = MOUNT_NONE */ 107 MOUNT_FFS, /* 1 = MOUNT_UFS */ 108 MOUNT_NFS, /* 2 */ 109 MOUNT_MFS, /* 3 */ 110 MOUNT_MSDOS, /* 4 */ 111 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 112 MOUNT_FDESC, /* 6 */ 113 MOUNT_KERNFS, /* 7 */ 114 NULL, /* 8 = MOUNT_DEVFS */ 115 MOUNT_AFS, /* 9 */ 116 }; 117 const int nmountcompatnames = sizeof(mountcompatnames) / 118 sizeof(mountcompatnames[0]); 119 #endif /* COMPAT_09 || COMPAT_43 */ 120 121 /* ARGSUSED */ 122 int 123 sys_mount(l, v, retval) 124 struct lwp *l; 125 void *v; 126 register_t *retval; 127 { 128 struct sys_mount_args /* { 129 syscallarg(const char *) type; 130 syscallarg(const char *) path; 131 syscallarg(int) flags; 132 syscallarg(void *) data; 133 } */ *uap = v; 134 struct proc *p = l->l_proc; 135 struct vnode *vp; 136 struct mount *mp; 137 int error, flag = 0; 138 char fstypename[MFSNAMELEN]; 139 struct vattr va; 140 struct nameidata nd; 141 struct vfsops *vfs; 142 143 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 144 (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 recursive. 157 */ 158 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 159 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 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 or MNT_GETARGS is required.) 180 */ 181 if (securelevel >= 2 && 182 SCARG(uap, flags) != MNT_GETARGS && 183 SCARG(uap, flags) != 184 (mp->mnt_flag | MNT_RDONLY | 185 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 186 vput(vp); 187 return (EPERM); 188 } 189 mp->mnt_flag |= SCARG(uap, flags) & 190 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 191 /* 192 * Only root, or the user that did the original mount is 193 * permitted to update it. 194 */ 195 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 196 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 197 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 198 vput(vp); 199 return (error); 200 } 201 /* 202 * Do not allow NFS export by non-root users. For non-root 203 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 204 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 205 */ 206 if (p->p_ucred->cr_uid != 0) { 207 if (SCARG(uap, flags) & MNT_EXPORTED) { 208 vput(vp); 209 return (EPERM); 210 } 211 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 212 if (flag & MNT_NOEXEC) 213 SCARG(uap, flags) |= MNT_NOEXEC; 214 } 215 if (vfs_busy(mp, LK_NOWAIT, 0)) { 216 vput(vp); 217 return (EPERM); 218 } 219 goto update; 220 } else { 221 if (securelevel >= 2) { 222 vput(vp); 223 return (EPERM); 224 } 225 } 226 /* 227 * If the user is not root, ensure that they own the directory 228 * onto which we are attempting to mount. 229 */ 230 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 231 (va.va_uid != p->p_ucred->cr_uid && 232 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 233 vput(vp); 234 return (error); 235 } 236 /* 237 * Do not allow NFS export by non-root users. For non-root users, 238 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 239 * mount point is already MNT_NOEXEC. 240 */ 241 if (p->p_ucred->cr_uid != 0) { 242 if (SCARG(uap, flags) & MNT_EXPORTED) { 243 vput(vp); 244 return (EPERM); 245 } 246 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 247 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 248 SCARG(uap, flags) |= MNT_NOEXEC; 249 } 250 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) { 251 vput(vp); 252 return (error); 253 } 254 if (vp->v_type != VDIR) { 255 vput(vp); 256 return (ENOTDIR); 257 } 258 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 259 if (error) { 260 #if defined(COMPAT_09) || defined(COMPAT_43) 261 /* 262 * Historically filesystem types were identified by number. 263 * If we get an integer for the filesystem type instead of a 264 * string, we check to see if it matches one of the historic 265 * filesystem types. 266 */ 267 u_long fsindex = (u_long)SCARG(uap, type); 268 if (fsindex >= nmountcompatnames || 269 mountcompatnames[fsindex] == NULL) { 270 vput(vp); 271 return (ENODEV); 272 } 273 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 274 #else 275 vput(vp); 276 return (error); 277 #endif 278 } 279 #ifdef COMPAT_10 280 /* Accept `ufs' as an alias for `ffs'. */ 281 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 282 strncpy(fstypename, "ffs", MFSNAMELEN); 283 #endif 284 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 285 vput(vp); 286 return (ENODEV); 287 } 288 if (vp->v_mountedhere != NULL) { 289 vput(vp); 290 return (EBUSY); 291 } 292 293 /* 294 * Allocate and initialize the file system. 295 */ 296 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 297 M_MOUNT, M_WAITOK); 298 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 299 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 300 (void)vfs_busy(mp, LK_NOWAIT, 0); 301 mp->mnt_op = vfs; 302 vfs->vfs_refcount++; 303 mp->mnt_vnodecovered = vp; 304 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 305 mp->mnt_unmounter = NULL; 306 307 /* 308 * The underlying file system may refuse the mount for 309 * various reasons. Allow the user to force it to happen. 310 */ 311 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 312 update: 313 /* 314 * Set the mount level flags. 315 */ 316 if (SCARG(uap, flags) & MNT_RDONLY) 317 mp->mnt_flag |= MNT_RDONLY; 318 else if (mp->mnt_flag & MNT_RDONLY) 319 mp->mnt_iflag |= IMNT_WANTRDWR; 320 mp->mnt_flag &= 321 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 322 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 323 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 324 mp->mnt_flag |= SCARG(uap, flags) & 325 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 326 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 327 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 328 MNT_IGNORE); 329 /* 330 * Mount the filesystem. 331 */ 332 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 333 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 334 if (mp->mnt_iflag & IMNT_WANTRDWR) 335 mp->mnt_flag &= ~MNT_RDONLY; 336 if (error || (mp->mnt_flag & MNT_GETARGS)) 337 mp->mnt_flag = flag; 338 mp->mnt_flag &=~ 339 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 340 mp->mnt_iflag &=~ IMNT_WANTRDWR; 341 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 342 if (mp->mnt_syncer == NULL) 343 error = vfs_allocate_syncvnode(mp); 344 } else { 345 if (mp->mnt_syncer != NULL) 346 vfs_deallocate_syncvnode(mp); 347 } 348 vfs_unbusy(mp); 349 VOP_UNLOCK(vp, 0); 350 vrele(vp); 351 return (error); 352 } 353 /* 354 * Put the new filesystem on the mount list after root. 355 */ 356 cache_purge(vp); 357 if (!error) { 358 mp->mnt_flag &=~ 359 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 360 mp->mnt_iflag &=~ IMNT_WANTRDWR; 361 vp->v_mountedhere = mp; 362 simple_lock(&mountlist_slock); 363 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 364 simple_unlock(&mountlist_slock); 365 checkdirs(vp); 366 VOP_UNLOCK(vp, 0); 367 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 368 error = vfs_allocate_syncvnode(mp); 369 vfs_unbusy(mp); 370 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 371 if ((error = VFS_START(mp, 0, p))) 372 vrele(vp); 373 } else { 374 vp->v_mountedhere = (struct mount *)0; 375 vfs->vfs_refcount--; 376 vfs_unbusy(mp); 377 free(mp, M_MOUNT); 378 vput(vp); 379 } 380 return (error); 381 } 382 383 /* 384 * Scan all active processes to see if any of them have a current 385 * or root directory onto which the new filesystem has just been 386 * mounted. If so, replace them with the new mount point. 387 */ 388 void 389 checkdirs(olddp) 390 struct vnode *olddp; 391 { 392 struct cwdinfo *cwdi; 393 struct vnode *newdp; 394 struct proc *p; 395 396 if (olddp->v_usecount == 1) 397 return; 398 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 399 panic("mount: lost mount"); 400 proclist_lock_read(); 401 LIST_FOREACH(p, &allproc, p_list) { 402 cwdi = p->p_cwdi; 403 if (cwdi->cwdi_cdir == olddp) { 404 vrele(cwdi->cwdi_cdir); 405 VREF(newdp); 406 cwdi->cwdi_cdir = newdp; 407 } 408 if (cwdi->cwdi_rdir == olddp) { 409 vrele(cwdi->cwdi_rdir); 410 VREF(newdp); 411 cwdi->cwdi_rdir = newdp; 412 } 413 } 414 proclist_unlock_read(); 415 if (rootvnode == olddp) { 416 vrele(rootvnode); 417 VREF(newdp); 418 rootvnode = newdp; 419 } 420 vput(newdp); 421 } 422 423 /* 424 * Unmount a file system. 425 * 426 * Note: unmount takes a path to the vnode mounted on as argument, 427 * not special file (as before). 428 */ 429 /* ARGSUSED */ 430 int 431 sys_unmount(l, v, retval) 432 struct lwp *l; 433 void *v; 434 register_t *retval; 435 { 436 struct sys_unmount_args /* { 437 syscallarg(const char *) path; 438 syscallarg(int) flags; 439 } */ *uap = v; 440 struct proc *p = l->l_proc; 441 struct vnode *vp; 442 struct mount *mp; 443 int error; 444 struct nameidata nd; 445 446 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 447 SCARG(uap, path), p); 448 if ((error = namei(&nd)) != 0) 449 return (error); 450 vp = nd.ni_vp; 451 mp = vp->v_mount; 452 453 /* 454 * Only root, or the user that did the original mount is 455 * permitted to unmount this filesystem. 456 */ 457 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 458 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 459 vput(vp); 460 return (error); 461 } 462 463 /* 464 * Don't allow unmounting the root file system. 465 */ 466 if (mp->mnt_flag & MNT_ROOTFS) { 467 vput(vp); 468 return (EINVAL); 469 } 470 471 /* 472 * Must be the root of the filesystem 473 */ 474 if ((vp->v_flag & VROOT) == 0) { 475 vput(vp); 476 return (EINVAL); 477 } 478 vput(vp); 479 480 /* 481 * XXX Freeze syncer. Must do this before locking the 482 * mount point. See dounmount() for details. 483 */ 484 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 485 486 if (vfs_busy(mp, 0, 0)) { 487 lockmgr(&syncer_lock, LK_RELEASE, NULL); 488 return (EBUSY); 489 } 490 491 return (dounmount(mp, SCARG(uap, flags), p)); 492 } 493 494 /* 495 * Do the actual file system unmount. File system is assumed to have been 496 * marked busy by the caller. 497 */ 498 int 499 dounmount(mp, flags, p) 500 struct mount *mp; 501 int flags; 502 struct proc *p; 503 { 504 struct vnode *coveredvp; 505 int error; 506 int async; 507 int used_syncer; 508 509 simple_lock(&mountlist_slock); 510 vfs_unbusy(mp); 511 used_syncer = (mp->mnt_syncer != NULL); 512 513 /* 514 * XXX Syncer must be frozen when we get here. This should really 515 * be done on a per-mountpoint basis, but especially the softdep 516 * code possibly called from the syncer doens't exactly work on a 517 * per-mountpoint basis, so the softdep code would become a maze 518 * of vfs_busy() calls. 519 * 520 * The caller of dounmount() must acquire syncer_lock because 521 * the syncer itself acquires locks in syncer_lock -> vfs_busy 522 * order, and we must preserve that order to avoid deadlock. 523 * 524 * So, if the file system did not use the syncer, now is 525 * the time to release the syncer_lock. 526 */ 527 if (used_syncer == 0) 528 lockmgr(&syncer_lock, LK_RELEASE, NULL); 529 530 mp->mnt_iflag |= IMNT_UNMOUNT; 531 mp->mnt_unmounter = p; 532 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 533 vn_start_write(NULL, &mp, V_WAIT); 534 535 if (mp->mnt_flag & MNT_EXPUBLIC) 536 vfs_setpublicfs(NULL, NULL, NULL); 537 async = mp->mnt_flag & MNT_ASYNC; 538 mp->mnt_flag &= ~MNT_ASYNC; 539 cache_purgevfs(mp); /* remove cache entries for this file sys */ 540 if (mp->mnt_syncer != NULL) 541 vfs_deallocate_syncvnode(mp); 542 if (((mp->mnt_flag & MNT_RDONLY) || 543 #if NFSS > 0 544 (error = fss_umount_hook(mp, (flags & MNT_FORCE))) == 0 || 545 #endif 546 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 547 (flags & MNT_FORCE)) 548 error = VFS_UNMOUNT(mp, flags, p); 549 vn_finished_write(mp, 0); 550 simple_lock(&mountlist_slock); 551 if (error) { 552 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 553 (void) vfs_allocate_syncvnode(mp); 554 mp->mnt_iflag &= ~IMNT_UNMOUNT; 555 mp->mnt_unmounter = NULL; 556 mp->mnt_flag |= async; 557 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 558 &mountlist_slock); 559 if (used_syncer) 560 lockmgr(&syncer_lock, LK_RELEASE, NULL); 561 while (mp->mnt_wcnt > 0) { 562 wakeup(mp); 563 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 564 } 565 return (error); 566 } 567 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 568 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 569 coveredvp->v_mountedhere = NULL; 570 vrele(coveredvp); 571 } 572 mp->mnt_op->vfs_refcount--; 573 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 574 panic("unmount: dangling vnode"); 575 mp->mnt_iflag |= IMNT_GONE; 576 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 577 if (used_syncer) 578 lockmgr(&syncer_lock, LK_RELEASE, NULL); 579 while(mp->mnt_wcnt > 0) { 580 wakeup(mp); 581 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 582 } 583 free(mp, M_MOUNT); 584 return (0); 585 } 586 587 /* 588 * Sync each mounted filesystem. 589 */ 590 #ifdef DEBUG 591 int syncprt = 0; 592 struct ctldebug debug0 = { "syncprt", &syncprt }; 593 #endif 594 595 /* ARGSUSED */ 596 int 597 sys_sync(l, v, retval) 598 struct lwp *l; 599 void *v; 600 register_t *retval; 601 { 602 struct mount *mp, *nmp; 603 int asyncflag; 604 struct proc *p = l == NULL ? &proc0 : l->l_proc; 605 606 simple_lock(&mountlist_slock); 607 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 608 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 609 nmp = mp->mnt_list.cqe_prev; 610 continue; 611 } 612 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 613 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 614 asyncflag = mp->mnt_flag & MNT_ASYNC; 615 mp->mnt_flag &= ~MNT_ASYNC; 616 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 617 if (asyncflag) 618 mp->mnt_flag |= MNT_ASYNC; 619 vn_finished_write(mp, 0); 620 } 621 simple_lock(&mountlist_slock); 622 nmp = mp->mnt_list.cqe_prev; 623 vfs_unbusy(mp); 624 625 } 626 simple_unlock(&mountlist_slock); 627 #ifdef DEBUG 628 if (syncprt) 629 vfs_bufstats(); 630 #endif /* DEBUG */ 631 return (0); 632 } 633 634 /* 635 * Change filesystem quotas. 636 */ 637 /* ARGSUSED */ 638 int 639 sys_quotactl(l, v, retval) 640 struct lwp *l; 641 void *v; 642 register_t *retval; 643 { 644 struct sys_quotactl_args /* { 645 syscallarg(const char *) path; 646 syscallarg(int) cmd; 647 syscallarg(int) uid; 648 syscallarg(caddr_t) arg; 649 } */ *uap = v; 650 struct proc *p = l->l_proc; 651 struct mount *mp; 652 int error; 653 struct nameidata nd; 654 655 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 656 if ((error = namei(&nd)) != 0) 657 return (error); 658 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 659 vrele(nd.ni_vp); 660 if (error) 661 return (error); 662 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 663 SCARG(uap, arg), p); 664 vn_finished_write(mp, 0); 665 return (error); 666 } 667 668 static int 669 dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags, 670 int root) 671 { 672 struct cwdinfo *cwdi = p->p_cwdi; 673 int error = 0; 674 675 /* 676 * If MNT_NOWAIT or MNT_LAZY is specified, do not 677 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 678 * overrides MNT_NOWAIT. 679 */ 680 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 681 (flags != MNT_WAIT && flags != 0)) { 682 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 683 goto done; 684 } 685 686 if ((error = VFS_STATFS(mp, sp, p)) != 0) { 687 return error; 688 } 689 690 if (cwdi->cwdi_rdir == NULL) 691 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 692 done: 693 if (cwdi->cwdi_rdir != NULL) { 694 size_t len; 695 char *bp; 696 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 697 if (!path) 698 return ENOMEM; 699 700 bp = path + MAXPATHLEN; 701 *--bp = '\0'; 702 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 703 MAXPATHLEN / 2, 0, p); 704 if (error) { 705 free(path, M_TEMP); 706 return error; 707 } 708 len = strlen(bp); 709 /* 710 * for mount points that are below our root, we can see 711 * them, so we fix up the pathname and return them. The 712 * rest we cannot see, so we don't allow viewing the 713 * data. 714 */ 715 if (strncmp(bp, sp->f_mntonname, len) == 0) { 716 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 717 sizeof(sp->f_mntonname)); 718 if (sp->f_mntonname[0] == '\0') 719 (void)strlcpy(sp->f_mntonname, "/", 720 sizeof(sp->f_mntonname)); 721 } else { 722 if (root) 723 (void)strlcpy(sp->f_mntonname, "/", 724 sizeof(sp->f_mntonname)); 725 else 726 error = EPERM; 727 } 728 free(path, M_TEMP); 729 } 730 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 731 sp->f_oflags = sp->f_flags & 0xffff; 732 return error; 733 } 734 735 /* 736 * Get filesystem statistics. 737 */ 738 /* ARGSUSED */ 739 int 740 sys_statfs(l, v, retval) 741 struct lwp *l; 742 void *v; 743 register_t *retval; 744 { 745 struct sys_statfs_args /* { 746 syscallarg(const char *) path; 747 syscallarg(struct statfs *) buf; 748 } */ *uap = v; 749 struct proc *p = l->l_proc; 750 struct mount *mp; 751 struct statfs sbuf; 752 int error; 753 struct nameidata nd; 754 755 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 756 if ((error = namei(&nd)) != 0) 757 return error; 758 mp = nd.ni_vp->v_mount; 759 vrele(nd.ni_vp); 760 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 761 return error; 762 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 763 } 764 765 /* 766 * Get filesystem statistics. 767 */ 768 /* ARGSUSED */ 769 int 770 sys_fstatfs(l, v, retval) 771 struct lwp *l; 772 void *v; 773 register_t *retval; 774 { 775 struct sys_fstatfs_args /* { 776 syscallarg(int) fd; 777 syscallarg(struct statfs *) buf; 778 } */ *uap = v; 779 struct proc *p = l->l_proc; 780 struct file *fp; 781 struct mount *mp; 782 struct statfs sbuf; 783 int error; 784 785 /* getvnode() will use the descriptor for us */ 786 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 787 return (error); 788 mp = ((struct vnode *)fp->f_data)->v_mount; 789 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 790 goto out; 791 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 792 out: 793 FILE_UNUSE(fp, p); 794 return error; 795 } 796 797 798 /* 799 * Get statistics on all filesystems. 800 */ 801 int 802 sys_getfsstat(l, v, retval) 803 struct lwp *l; 804 void *v; 805 register_t *retval; 806 { 807 struct sys_getfsstat_args /* { 808 syscallarg(struct statfs *) buf; 809 syscallarg(long) bufsize; 810 syscallarg(int) flags; 811 } */ *uap = v; 812 int root = 0; 813 struct proc *p = l->l_proc; 814 struct mount *mp, *nmp; 815 struct statfs sbuf; 816 caddr_t sfsp; 817 long count, maxcount, error = 0; 818 819 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 820 sfsp = (caddr_t)SCARG(uap, buf); 821 simple_lock(&mountlist_slock); 822 count = 0; 823 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 824 mp = nmp) { 825 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 826 nmp = CIRCLEQ_NEXT(mp, mnt_list); 827 continue; 828 } 829 if (sfsp && count < maxcount) { 830 error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0); 831 if (error) { 832 simple_lock(&mountlist_slock); 833 nmp = CIRCLEQ_NEXT(mp, mnt_list); 834 vfs_unbusy(mp); 835 continue; 836 } 837 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 838 if (error) { 839 vfs_unbusy(mp); 840 return (error); 841 } 842 sfsp += sizeof(sbuf); 843 root |= strcmp(sbuf.f_mntonname, "/") == 0; 844 } 845 count++; 846 simple_lock(&mountlist_slock); 847 nmp = CIRCLEQ_NEXT(mp, mnt_list); 848 vfs_unbusy(mp); 849 } 850 simple_unlock(&mountlist_slock); 851 if (root == 0 && p->p_cwdi->cwdi_rdir) { 852 /* 853 * fake a root entry 854 */ 855 if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 856 SCARG(uap, flags), 1)) != 0) 857 return error; 858 if (sfsp) 859 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 860 count++; 861 } 862 if (sfsp && count > maxcount) 863 *retval = maxcount; 864 else 865 *retval = count; 866 return error; 867 } 868 869 /* 870 * Change current working directory to a given file descriptor. 871 */ 872 /* ARGSUSED */ 873 int 874 sys_fchdir(l, v, retval) 875 struct lwp *l; 876 void *v; 877 register_t *retval; 878 { 879 struct sys_fchdir_args /* { 880 syscallarg(int) fd; 881 } */ *uap = v; 882 struct proc *p = l->l_proc; 883 struct filedesc *fdp = p->p_fd; 884 struct cwdinfo *cwdi = p->p_cwdi; 885 struct vnode *vp, *tdp; 886 struct mount *mp; 887 struct file *fp; 888 int error; 889 890 /* getvnode() will use the descriptor for us */ 891 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 892 return (error); 893 vp = (struct vnode *)fp->f_data; 894 895 VREF(vp); 896 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 897 if (vp->v_type != VDIR) 898 error = ENOTDIR; 899 else 900 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 901 while (!error && (mp = vp->v_mountedhere) != NULL) { 902 if (vfs_busy(mp, 0, 0)) 903 continue; 904 error = VFS_ROOT(mp, &tdp); 905 vfs_unbusy(mp); 906 if (error) 907 break; 908 vput(vp); 909 vp = tdp; 910 } 911 if (error) { 912 vput(vp); 913 goto out; 914 } 915 VOP_UNLOCK(vp, 0); 916 917 /* 918 * Disallow changing to a directory not under the process's 919 * current root directory (if there is one). 920 */ 921 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 922 vrele(vp); 923 error = EPERM; /* operation not permitted */ 924 goto out; 925 } 926 927 vrele(cwdi->cwdi_cdir); 928 cwdi->cwdi_cdir = vp; 929 out: 930 FILE_UNUSE(fp, p); 931 return (error); 932 } 933 934 /* 935 * Change this process's notion of the root directory to a given file descriptor. 936 */ 937 938 int 939 sys_fchroot(l, v, retval) 940 struct lwp *l; 941 void *v; 942 register_t *retval; 943 { 944 struct sys_fchroot_args *uap = v; 945 struct proc *p = l->l_proc; 946 struct filedesc *fdp = p->p_fd; 947 struct cwdinfo *cwdi = p->p_cwdi; 948 struct vnode *vp; 949 struct file *fp; 950 int error; 951 952 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 953 return error; 954 /* getvnode() will use the descriptor for us */ 955 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 956 return error; 957 vp = (struct vnode *) fp->f_data; 958 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 959 if (vp->v_type != VDIR) 960 error = ENOTDIR; 961 else 962 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 963 VOP_UNLOCK(vp, 0); 964 if (error) 965 goto out; 966 VREF(vp); 967 968 /* 969 * Prevent escaping from chroot by putting the root under 970 * the working directory. Silently chdir to / if we aren't 971 * already there. 972 */ 973 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 974 /* 975 * XXX would be more failsafe to change directory to a 976 * deadfs node here instead 977 */ 978 vrele(cwdi->cwdi_cdir); 979 VREF(vp); 980 cwdi->cwdi_cdir = vp; 981 } 982 983 if (cwdi->cwdi_rdir != NULL) 984 vrele(cwdi->cwdi_rdir); 985 cwdi->cwdi_rdir = vp; 986 out: 987 FILE_UNUSE(fp, p); 988 return (error); 989 } 990 991 992 993 /* 994 * Change current working directory (``.''). 995 */ 996 /* ARGSUSED */ 997 int 998 sys_chdir(l, v, retval) 999 struct lwp *l; 1000 void *v; 1001 register_t *retval; 1002 { 1003 struct sys_chdir_args /* { 1004 syscallarg(const char *) path; 1005 } */ *uap = v; 1006 struct proc *p = l->l_proc; 1007 struct cwdinfo *cwdi = p->p_cwdi; 1008 int error; 1009 struct nameidata nd; 1010 1011 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1012 SCARG(uap, path), p); 1013 if ((error = change_dir(&nd, p)) != 0) 1014 return (error); 1015 vrele(cwdi->cwdi_cdir); 1016 cwdi->cwdi_cdir = nd.ni_vp; 1017 return (0); 1018 } 1019 1020 /* 1021 * Change notion of root (``/'') directory. 1022 */ 1023 /* ARGSUSED */ 1024 int 1025 sys_chroot(l, v, retval) 1026 struct lwp *l; 1027 void *v; 1028 register_t *retval; 1029 { 1030 struct sys_chroot_args /* { 1031 syscallarg(const char *) path; 1032 } */ *uap = v; 1033 struct proc *p = l->l_proc; 1034 struct cwdinfo *cwdi = p->p_cwdi; 1035 struct vnode *vp; 1036 int error; 1037 struct nameidata nd; 1038 1039 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1040 return (error); 1041 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1042 SCARG(uap, path), p); 1043 if ((error = change_dir(&nd, p)) != 0) 1044 return (error); 1045 if (cwdi->cwdi_rdir != NULL) 1046 vrele(cwdi->cwdi_rdir); 1047 vp = nd.ni_vp; 1048 cwdi->cwdi_rdir = vp; 1049 1050 /* 1051 * Prevent escaping from chroot by putting the root under 1052 * the working directory. Silently chdir to / if we aren't 1053 * already there. 1054 */ 1055 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1056 /* 1057 * XXX would be more failsafe to change directory to a 1058 * deadfs node here instead 1059 */ 1060 vrele(cwdi->cwdi_cdir); 1061 VREF(vp); 1062 cwdi->cwdi_cdir = vp; 1063 } 1064 1065 return (0); 1066 } 1067 1068 /* 1069 * Common routine for chroot and chdir. 1070 */ 1071 static int 1072 change_dir(ndp, p) 1073 struct nameidata *ndp; 1074 struct proc *p; 1075 { 1076 struct vnode *vp; 1077 int error; 1078 1079 if ((error = namei(ndp)) != 0) 1080 return (error); 1081 vp = ndp->ni_vp; 1082 if (vp->v_type != VDIR) 1083 error = ENOTDIR; 1084 else 1085 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1086 1087 if (error) 1088 vput(vp); 1089 else 1090 VOP_UNLOCK(vp, 0); 1091 return (error); 1092 } 1093 1094 /* 1095 * Check permissions, allocate an open file structure, 1096 * and call the device open routine if any. 1097 */ 1098 int 1099 sys_open(l, v, retval) 1100 struct lwp *l; 1101 void *v; 1102 register_t *retval; 1103 { 1104 struct sys_open_args /* { 1105 syscallarg(const char *) path; 1106 syscallarg(int) flags; 1107 syscallarg(int) mode; 1108 } */ *uap = v; 1109 struct proc *p = l->l_proc; 1110 struct cwdinfo *cwdi = p->p_cwdi; 1111 struct filedesc *fdp = p->p_fd; 1112 struct file *fp; 1113 struct vnode *vp; 1114 int flags, cmode; 1115 int type, indx, error; 1116 struct flock lf; 1117 struct nameidata nd; 1118 1119 flags = FFLAGS(SCARG(uap, flags)); 1120 if ((flags & (FREAD | FWRITE)) == 0) 1121 return (EINVAL); 1122 /* falloc() will use the file descriptor for us */ 1123 if ((error = falloc(p, &fp, &indx)) != 0) 1124 return (error); 1125 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1126 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1127 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1128 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1129 FILE_UNUSE(fp, p); 1130 fdp->fd_ofiles[indx] = NULL; 1131 ffree(fp); 1132 if ((error == ENODEV || error == ENXIO) && 1133 l->l_dupfd >= 0 && /* XXX from fdopen */ 1134 (error = 1135 dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) { 1136 *retval = indx; 1137 return (0); 1138 } 1139 if (error == ERESTART) 1140 error = EINTR; 1141 fdremove(fdp, indx); 1142 return (error); 1143 } 1144 l->l_dupfd = 0; 1145 vp = nd.ni_vp; 1146 fp->f_flag = flags & FMASK; 1147 fp->f_type = DTYPE_VNODE; 1148 fp->f_ops = &vnops; 1149 fp->f_data = vp; 1150 if (flags & (O_EXLOCK | O_SHLOCK)) { 1151 lf.l_whence = SEEK_SET; 1152 lf.l_start = 0; 1153 lf.l_len = 0; 1154 if (flags & O_EXLOCK) 1155 lf.l_type = F_WRLCK; 1156 else 1157 lf.l_type = F_RDLCK; 1158 type = F_FLOCK; 1159 if ((flags & FNONBLOCK) == 0) 1160 type |= F_WAIT; 1161 VOP_UNLOCK(vp, 0); 1162 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1163 if (error) { 1164 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1165 FILE_UNUSE(fp, p); 1166 ffree(fp); 1167 fdremove(fdp, indx); 1168 return (error); 1169 } 1170 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1171 fp->f_flag |= FHASLOCK; 1172 } 1173 VOP_UNLOCK(vp, 0); 1174 *retval = indx; 1175 FILE_SET_MATURE(fp); 1176 FILE_UNUSE(fp, p); 1177 return (0); 1178 } 1179 1180 /* 1181 * Get file handle system call 1182 */ 1183 int 1184 sys_getfh(l, v, retval) 1185 struct lwp *l; 1186 void *v; 1187 register_t *retval; 1188 { 1189 struct sys_getfh_args /* { 1190 syscallarg(char *) fname; 1191 syscallarg(fhandle_t *) fhp; 1192 } */ *uap = v; 1193 struct proc *p = l->l_proc; 1194 struct vnode *vp; 1195 fhandle_t fh; 1196 int error; 1197 struct nameidata nd; 1198 1199 /* 1200 * Must be super user 1201 */ 1202 error = suser(p->p_ucred, &p->p_acflag); 1203 if (error) 1204 return (error); 1205 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1206 SCARG(uap, fname), p); 1207 error = namei(&nd); 1208 if (error) 1209 return (error); 1210 vp = nd.ni_vp; 1211 memset(&fh, 0, sizeof(fh)); 1212 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1213 error = VFS_VPTOFH(vp, &fh.fh_fid); 1214 vput(vp); 1215 if (error) 1216 return (error); 1217 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1218 return (error); 1219 } 1220 1221 /* 1222 * Open a file given a file handle. 1223 * 1224 * Check permissions, allocate an open file structure, 1225 * and call the device open routine if any. 1226 */ 1227 int 1228 sys_fhopen(l, v, retval) 1229 struct lwp *l; 1230 void *v; 1231 register_t *retval; 1232 { 1233 struct sys_fhopen_args /* { 1234 syscallarg(const fhandle_t *) fhp; 1235 syscallarg(int) flags; 1236 } */ *uap = v; 1237 struct proc *p = l->l_proc; 1238 struct filedesc *fdp = p->p_fd; 1239 struct file *fp; 1240 struct vnode *vp = NULL; 1241 struct mount *mp; 1242 struct ucred *cred = p->p_ucred; 1243 int flags; 1244 struct file *nfp; 1245 int type, indx, error=0; 1246 struct flock lf; 1247 struct vattr va; 1248 fhandle_t fh; 1249 1250 /* 1251 * Must be super user 1252 */ 1253 if ((error = suser(p->p_ucred, &p->p_acflag))) 1254 return (error); 1255 1256 flags = FFLAGS(SCARG(uap, flags)); 1257 if ((flags & (FREAD | FWRITE)) == 0) 1258 return (EINVAL); 1259 if ((flags & O_CREAT)) 1260 return (EINVAL); 1261 /* falloc() will use the file descriptor for us */ 1262 if ((error = falloc(p, &nfp, &indx)) != 0) 1263 return (error); 1264 fp = nfp; 1265 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1266 goto bad; 1267 1268 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1269 error = ESTALE; 1270 goto bad; 1271 } 1272 1273 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1274 vp = NULL; /* most likely unnecessary sanity for bad: */ 1275 goto bad; 1276 } 1277 1278 /* Now do an effective vn_open */ 1279 1280 if (vp->v_type == VSOCK) { 1281 error = EOPNOTSUPP; 1282 goto bad; 1283 } 1284 if (flags & FREAD) { 1285 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1286 goto bad; 1287 } 1288 if (flags & (FWRITE | O_TRUNC)) { 1289 if (vp->v_type == VDIR) { 1290 error = EISDIR; 1291 goto bad; 1292 } 1293 if ((error = vn_writechk(vp)) != 0 || 1294 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1295 goto bad; 1296 } 1297 if (flags & O_TRUNC) { 1298 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1299 goto bad; 1300 VOP_UNLOCK(vp, 0); /* XXX */ 1301 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1302 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1303 VATTR_NULL(&va); 1304 va.va_size = 0; 1305 error = VOP_SETATTR(vp, &va, cred, p); 1306 vn_finished_write(mp, 0); 1307 if (error) 1308 goto bad; 1309 } 1310 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1311 goto bad; 1312 if (vp->v_type == VREG && 1313 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1314 error = EIO; 1315 goto bad; 1316 } 1317 if (flags & FWRITE) 1318 vp->v_writecount++; 1319 1320 /* done with modified vn_open, now finish what sys_open does. */ 1321 1322 fp->f_flag = flags & FMASK; 1323 fp->f_type = DTYPE_VNODE; 1324 fp->f_ops = &vnops; 1325 fp->f_data = vp; 1326 if (flags & (O_EXLOCK | O_SHLOCK)) { 1327 lf.l_whence = SEEK_SET; 1328 lf.l_start = 0; 1329 lf.l_len = 0; 1330 if (flags & O_EXLOCK) 1331 lf.l_type = F_WRLCK; 1332 else 1333 lf.l_type = F_RDLCK; 1334 type = F_FLOCK; 1335 if ((flags & FNONBLOCK) == 0) 1336 type |= F_WAIT; 1337 VOP_UNLOCK(vp, 0); 1338 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1339 if (error) { 1340 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1341 FILE_UNUSE(fp, p); 1342 ffree(fp); 1343 fdremove(fdp, indx); 1344 return (error); 1345 } 1346 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1347 fp->f_flag |= FHASLOCK; 1348 } 1349 VOP_UNLOCK(vp, 0); 1350 *retval = indx; 1351 FILE_SET_MATURE(fp); 1352 FILE_UNUSE(fp, p); 1353 return (0); 1354 1355 bad: 1356 FILE_UNUSE(fp, p); 1357 ffree(fp); 1358 fdremove(fdp, indx); 1359 if (vp != NULL) 1360 vput(vp); 1361 return (error); 1362 } 1363 1364 /* ARGSUSED */ 1365 int 1366 sys_fhstat(l, v, retval) 1367 struct lwp *l; 1368 void *v; 1369 register_t *retval; 1370 { 1371 struct sys_fhstat_args /* { 1372 syscallarg(const fhandle_t *) fhp; 1373 syscallarg(struct stat *) sb; 1374 } */ *uap = v; 1375 struct proc *p = l->l_proc; 1376 struct stat sb; 1377 int error; 1378 fhandle_t fh; 1379 struct mount *mp; 1380 struct vnode *vp; 1381 1382 /* 1383 * Must be super user 1384 */ 1385 if ((error = suser(p->p_ucred, &p->p_acflag))) 1386 return (error); 1387 1388 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1389 return (error); 1390 1391 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1392 return (ESTALE); 1393 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1394 return (error); 1395 error = vn_stat(vp, &sb, p); 1396 vput(vp); 1397 if (error) 1398 return (error); 1399 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1400 return (error); 1401 } 1402 1403 /* ARGSUSED */ 1404 int 1405 sys_fhstatfs(l, v, retval) 1406 struct lwp *l; 1407 void *v; 1408 register_t *retval; 1409 { 1410 struct sys_fhstatfs_args /* 1411 syscallarg(const fhandle_t *) fhp; 1412 syscallarg(struct statfs *) buf; 1413 } */ *uap = v; 1414 struct proc *p = l->l_proc; 1415 struct statfs sbuf; 1416 fhandle_t fh; 1417 struct mount *mp; 1418 struct vnode *vp; 1419 int error; 1420 1421 /* 1422 * Must be super user 1423 */ 1424 if ((error = suser(p->p_ucred, &p->p_acflag))) 1425 return (error); 1426 1427 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1428 return (error); 1429 1430 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1431 return (ESTALE); 1432 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1433 return (error); 1434 mp = vp->v_mount; 1435 vput(vp); 1436 if ((error = VFS_STATFS(mp, &sbuf, p)) != 0) 1437 return (error); 1438 return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf))); 1439 } 1440 1441 /* 1442 * Create a special file. 1443 */ 1444 /* ARGSUSED */ 1445 int 1446 sys_mknod(l, v, retval) 1447 struct lwp *l; 1448 void *v; 1449 register_t *retval; 1450 { 1451 struct sys_mknod_args /* { 1452 syscallarg(const char *) path; 1453 syscallarg(int) mode; 1454 syscallarg(int) dev; 1455 } */ *uap = v; 1456 struct proc *p = l->l_proc; 1457 struct vnode *vp; 1458 struct mount *mp; 1459 struct vattr vattr; 1460 int error; 1461 int whiteout = 0; 1462 struct nameidata nd; 1463 1464 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1465 return (error); 1466 restart: 1467 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1468 if ((error = namei(&nd)) != 0) 1469 return (error); 1470 vp = nd.ni_vp; 1471 if (vp != NULL) 1472 error = EEXIST; 1473 else { 1474 VATTR_NULL(&vattr); 1475 vattr.va_mode = 1476 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1477 vattr.va_rdev = SCARG(uap, dev); 1478 whiteout = 0; 1479 1480 switch (SCARG(uap, mode) & S_IFMT) { 1481 case S_IFMT: /* used by badsect to flag bad sectors */ 1482 vattr.va_type = VBAD; 1483 break; 1484 case S_IFCHR: 1485 vattr.va_type = VCHR; 1486 break; 1487 case S_IFBLK: 1488 vattr.va_type = VBLK; 1489 break; 1490 case S_IFWHT: 1491 whiteout = 1; 1492 break; 1493 default: 1494 error = EINVAL; 1495 break; 1496 } 1497 } 1498 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1499 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1500 if (nd.ni_dvp == vp) 1501 vrele(nd.ni_dvp); 1502 else 1503 vput(nd.ni_dvp); 1504 if (vp) 1505 vrele(vp); 1506 if ((error = vn_start_write(NULL, &mp, 1507 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1508 return (error); 1509 goto restart; 1510 } 1511 if (!error) { 1512 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1513 if (whiteout) { 1514 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1515 if (error) 1516 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1517 vput(nd.ni_dvp); 1518 } else { 1519 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1520 &nd.ni_cnd, &vattr); 1521 if (error == 0) 1522 vput(nd.ni_vp); 1523 } 1524 } else { 1525 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1526 if (nd.ni_dvp == vp) 1527 vrele(nd.ni_dvp); 1528 else 1529 vput(nd.ni_dvp); 1530 if (vp) 1531 vrele(vp); 1532 } 1533 vn_finished_write(mp, 0); 1534 return (error); 1535 } 1536 1537 /* 1538 * Create a named pipe. 1539 */ 1540 /* ARGSUSED */ 1541 int 1542 sys_mkfifo(l, v, retval) 1543 struct lwp *l; 1544 void *v; 1545 register_t *retval; 1546 { 1547 struct sys_mkfifo_args /* { 1548 syscallarg(const char *) path; 1549 syscallarg(int) mode; 1550 } */ *uap = v; 1551 struct proc *p = l->l_proc; 1552 struct mount *mp; 1553 struct vattr vattr; 1554 int error; 1555 struct nameidata nd; 1556 1557 restart: 1558 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1559 if ((error = namei(&nd)) != 0) 1560 return (error); 1561 if (nd.ni_vp != NULL) { 1562 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1563 if (nd.ni_dvp == nd.ni_vp) 1564 vrele(nd.ni_dvp); 1565 else 1566 vput(nd.ni_dvp); 1567 vrele(nd.ni_vp); 1568 return (EEXIST); 1569 } 1570 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1571 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1572 if (nd.ni_dvp == nd.ni_vp) 1573 vrele(nd.ni_dvp); 1574 else 1575 vput(nd.ni_dvp); 1576 if (nd.ni_vp) 1577 vrele(nd.ni_vp); 1578 if ((error = vn_start_write(NULL, &mp, 1579 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1580 return (error); 1581 goto restart; 1582 } 1583 VATTR_NULL(&vattr); 1584 vattr.va_type = VFIFO; 1585 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1586 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1587 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1588 if (error == 0) 1589 vput(nd.ni_vp); 1590 vn_finished_write(mp, 0); 1591 return (error); 1592 } 1593 1594 /* 1595 * Make a hard file link. 1596 */ 1597 /* ARGSUSED */ 1598 int 1599 sys_link(l, v, retval) 1600 struct lwp *l; 1601 void *v; 1602 register_t *retval; 1603 { 1604 struct sys_link_args /* { 1605 syscallarg(const char *) path; 1606 syscallarg(const char *) link; 1607 } */ *uap = v; 1608 struct proc *p = l->l_proc; 1609 struct vnode *vp; 1610 struct mount *mp; 1611 struct nameidata nd; 1612 int error; 1613 1614 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1615 if ((error = namei(&nd)) != 0) 1616 return (error); 1617 vp = nd.ni_vp; 1618 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1619 vrele(vp); 1620 return (error); 1621 } 1622 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1623 if ((error = namei(&nd)) != 0) 1624 goto out; 1625 if (nd.ni_vp) { 1626 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1627 if (nd.ni_dvp == nd.ni_vp) 1628 vrele(nd.ni_dvp); 1629 else 1630 vput(nd.ni_dvp); 1631 vrele(nd.ni_vp); 1632 error = EEXIST; 1633 goto out; 1634 } 1635 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1636 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1637 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1638 out: 1639 vrele(vp); 1640 vn_finished_write(mp, 0); 1641 return (error); 1642 } 1643 1644 /* 1645 * Make a symbolic link. 1646 */ 1647 /* ARGSUSED */ 1648 int 1649 sys_symlink(l, v, retval) 1650 struct lwp *l; 1651 void *v; 1652 register_t *retval; 1653 { 1654 struct sys_symlink_args /* { 1655 syscallarg(const char *) path; 1656 syscallarg(const char *) link; 1657 } */ *uap = v; 1658 struct proc *p = l->l_proc; 1659 struct mount *mp; 1660 struct vattr vattr; 1661 char *path; 1662 int error; 1663 struct nameidata nd; 1664 1665 path = PNBUF_GET(); 1666 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1667 if (error) 1668 goto out; 1669 restart: 1670 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1671 if ((error = namei(&nd)) != 0) 1672 goto out; 1673 if (nd.ni_vp) { 1674 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1675 if (nd.ni_dvp == nd.ni_vp) 1676 vrele(nd.ni_dvp); 1677 else 1678 vput(nd.ni_dvp); 1679 vrele(nd.ni_vp); 1680 error = EEXIST; 1681 goto out; 1682 } 1683 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1684 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1685 if (nd.ni_dvp == nd.ni_vp) 1686 vrele(nd.ni_dvp); 1687 else 1688 vput(nd.ni_dvp); 1689 if ((error = vn_start_write(NULL, &mp, 1690 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1691 return (error); 1692 goto restart; 1693 } 1694 VATTR_NULL(&vattr); 1695 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1696 VOP_LEASE(nd.ni_dvp, p, 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(l, v, retval) 1712 struct lwp *l; 1713 void *v; 1714 register_t *retval; 1715 { 1716 struct sys_undelete_args /* { 1717 syscallarg(const char *) path; 1718 } */ *uap = v; 1719 struct proc *p = l->l_proc; 1720 int error; 1721 struct mount *mp; 1722 struct nameidata nd; 1723 1724 restart: 1725 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1726 SCARG(uap, path), p); 1727 error = namei(&nd); 1728 if (error) 1729 return (error); 1730 1731 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1732 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1733 if (nd.ni_dvp == nd.ni_vp) 1734 vrele(nd.ni_dvp); 1735 else 1736 vput(nd.ni_dvp); 1737 if (nd.ni_vp) 1738 vrele(nd.ni_vp); 1739 return (EEXIST); 1740 } 1741 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1742 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1743 if (nd.ni_dvp == nd.ni_vp) 1744 vrele(nd.ni_dvp); 1745 else 1746 vput(nd.ni_dvp); 1747 if ((error = vn_start_write(NULL, &mp, 1748 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1749 return (error); 1750 goto restart; 1751 } 1752 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1753 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1754 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1755 vput(nd.ni_dvp); 1756 vn_finished_write(mp, 0); 1757 return (error); 1758 } 1759 1760 /* 1761 * Delete a name from the filesystem. 1762 */ 1763 /* ARGSUSED */ 1764 int 1765 sys_unlink(l, v, retval) 1766 struct lwp *l; 1767 void *v; 1768 register_t *retval; 1769 { 1770 struct sys_unlink_args /* { 1771 syscallarg(const char *) path; 1772 } */ *uap = v; 1773 struct proc *p = l->l_proc; 1774 struct mount *mp; 1775 struct vnode *vp; 1776 int error; 1777 struct nameidata nd; 1778 1779 restart: 1780 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1781 SCARG(uap, path), p); 1782 if ((error = namei(&nd)) != 0) 1783 return (error); 1784 vp = nd.ni_vp; 1785 1786 /* 1787 * The root of a mounted filesystem cannot be deleted. 1788 */ 1789 if (vp->v_flag & VROOT) { 1790 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1791 if (nd.ni_dvp == vp) 1792 vrele(nd.ni_dvp); 1793 else 1794 vput(nd.ni_dvp); 1795 vput(vp); 1796 error = EBUSY; 1797 goto out; 1798 } 1799 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1800 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1801 if (nd.ni_dvp == vp) 1802 vrele(nd.ni_dvp); 1803 else 1804 vput(nd.ni_dvp); 1805 vput(vp); 1806 if ((error = vn_start_write(NULL, &mp, 1807 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1808 return (error); 1809 goto restart; 1810 } 1811 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1812 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1813 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1814 vn_finished_write(mp, 0); 1815 out: 1816 return (error); 1817 } 1818 1819 /* 1820 * Reposition read/write file offset. 1821 */ 1822 int 1823 sys_lseek(l, v, retval) 1824 struct lwp *l; 1825 void *v; 1826 register_t *retval; 1827 { 1828 struct sys_lseek_args /* { 1829 syscallarg(int) fd; 1830 syscallarg(int) pad; 1831 syscallarg(off_t) offset; 1832 syscallarg(int) whence; 1833 } */ *uap = v; 1834 struct proc *p = l->l_proc; 1835 struct ucred *cred = p->p_ucred; 1836 struct filedesc *fdp = p->p_fd; 1837 struct file *fp; 1838 struct vnode *vp; 1839 struct vattr vattr; 1840 off_t newoff; 1841 int error; 1842 1843 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1844 return (EBADF); 1845 1846 FILE_USE(fp); 1847 1848 vp = (struct vnode *)fp->f_data; 1849 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1850 error = ESPIPE; 1851 goto out; 1852 } 1853 1854 switch (SCARG(uap, whence)) { 1855 case SEEK_CUR: 1856 newoff = fp->f_offset + SCARG(uap, offset); 1857 break; 1858 case SEEK_END: 1859 error = VOP_GETATTR(vp, &vattr, cred, p); 1860 if (error) 1861 goto out; 1862 newoff = SCARG(uap, offset) + vattr.va_size; 1863 break; 1864 case SEEK_SET: 1865 newoff = SCARG(uap, offset); 1866 break; 1867 default: 1868 error = EINVAL; 1869 goto out; 1870 } 1871 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1872 goto out; 1873 1874 *(off_t *)retval = fp->f_offset = newoff; 1875 out: 1876 FILE_UNUSE(fp, p); 1877 return (error); 1878 } 1879 1880 /* 1881 * Positional read system call. 1882 */ 1883 int 1884 sys_pread(l, v, retval) 1885 struct lwp *l; 1886 void *v; 1887 register_t *retval; 1888 { 1889 struct sys_pread_args /* { 1890 syscallarg(int) fd; 1891 syscallarg(void *) buf; 1892 syscallarg(size_t) nbyte; 1893 syscallarg(off_t) offset; 1894 } */ *uap = v; 1895 struct proc *p = l->l_proc; 1896 struct filedesc *fdp = p->p_fd; 1897 struct file *fp; 1898 struct vnode *vp; 1899 off_t offset; 1900 int error, fd = SCARG(uap, fd); 1901 1902 if ((fp = fd_getfile(fdp, fd)) == NULL) 1903 return (EBADF); 1904 1905 if ((fp->f_flag & FREAD) == 0) { 1906 simple_unlock(&fp->f_slock); 1907 return (EBADF); 1908 } 1909 1910 FILE_USE(fp); 1911 1912 vp = (struct vnode *)fp->f_data; 1913 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1914 error = ESPIPE; 1915 goto out; 1916 } 1917 1918 offset = SCARG(uap, offset); 1919 1920 /* 1921 * XXX This works because no file systems actually 1922 * XXX take any action on the seek operation. 1923 */ 1924 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1925 goto out; 1926 1927 /* dofileread() will unuse the descriptor for us */ 1928 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1929 &offset, 0, retval)); 1930 1931 out: 1932 FILE_UNUSE(fp, p); 1933 return (error); 1934 } 1935 1936 /* 1937 * Positional scatter read system call. 1938 */ 1939 int 1940 sys_preadv(l, v, retval) 1941 struct lwp *l; 1942 void *v; 1943 register_t *retval; 1944 { 1945 struct sys_preadv_args /* { 1946 syscallarg(int) fd; 1947 syscallarg(const struct iovec *) iovp; 1948 syscallarg(int) iovcnt; 1949 syscallarg(off_t) offset; 1950 } */ *uap = v; 1951 struct proc *p = l->l_proc; 1952 struct filedesc *fdp = p->p_fd; 1953 struct file *fp; 1954 struct vnode *vp; 1955 off_t offset; 1956 int error, fd = SCARG(uap, fd); 1957 1958 if ((fp = fd_getfile(fdp, fd)) == NULL) 1959 return (EBADF); 1960 1961 if ((fp->f_flag & FREAD) == 0) { 1962 simple_unlock(&fp->f_slock); 1963 return (EBADF); 1964 } 1965 1966 FILE_USE(fp); 1967 1968 vp = (struct vnode *)fp->f_data; 1969 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1970 error = ESPIPE; 1971 goto out; 1972 } 1973 1974 offset = SCARG(uap, offset); 1975 1976 /* 1977 * XXX This works because no file systems actually 1978 * XXX take any action on the seek operation. 1979 */ 1980 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1981 goto out; 1982 1983 /* dofilereadv() will unuse the descriptor for us */ 1984 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1985 &offset, 0, retval)); 1986 1987 out: 1988 FILE_UNUSE(fp, p); 1989 return (error); 1990 } 1991 1992 /* 1993 * Positional write system call. 1994 */ 1995 int 1996 sys_pwrite(l, v, retval) 1997 struct lwp *l; 1998 void *v; 1999 register_t *retval; 2000 { 2001 struct sys_pwrite_args /* { 2002 syscallarg(int) fd; 2003 syscallarg(const void *) buf; 2004 syscallarg(size_t) nbyte; 2005 syscallarg(off_t) offset; 2006 } */ *uap = v; 2007 struct proc *p = l->l_proc; 2008 struct filedesc *fdp = p->p_fd; 2009 struct file *fp; 2010 struct vnode *vp; 2011 off_t offset; 2012 int error, fd = SCARG(uap, fd); 2013 2014 if ((fp = fd_getfile(fdp, fd)) == NULL) 2015 return (EBADF); 2016 2017 if ((fp->f_flag & FWRITE) == 0) { 2018 simple_unlock(&fp->f_slock); 2019 return (EBADF); 2020 } 2021 2022 FILE_USE(fp); 2023 2024 vp = (struct vnode *)fp->f_data; 2025 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2026 error = ESPIPE; 2027 goto out; 2028 } 2029 2030 offset = SCARG(uap, offset); 2031 2032 /* 2033 * XXX This works because no file systems actually 2034 * XXX take any action on the seek operation. 2035 */ 2036 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2037 goto out; 2038 2039 /* dofilewrite() will unuse the descriptor for us */ 2040 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2041 &offset, 0, retval)); 2042 2043 out: 2044 FILE_UNUSE(fp, p); 2045 return (error); 2046 } 2047 2048 /* 2049 * Positional gather write system call. 2050 */ 2051 int 2052 sys_pwritev(l, v, retval) 2053 struct lwp *l; 2054 void *v; 2055 register_t *retval; 2056 { 2057 struct sys_pwritev_args /* { 2058 syscallarg(int) fd; 2059 syscallarg(const struct iovec *) iovp; 2060 syscallarg(int) iovcnt; 2061 syscallarg(off_t) offset; 2062 } */ *uap = v; 2063 struct proc *p = l->l_proc; 2064 struct filedesc *fdp = p->p_fd; 2065 struct file *fp; 2066 struct vnode *vp; 2067 off_t offset; 2068 int error, fd = SCARG(uap, fd); 2069 2070 if ((fp = fd_getfile(fdp, fd)) == NULL) 2071 return (EBADF); 2072 2073 if ((fp->f_flag & FWRITE) == 0) { 2074 simple_unlock(&fp->f_slock); 2075 return (EBADF); 2076 } 2077 2078 FILE_USE(fp); 2079 2080 vp = (struct vnode *)fp->f_data; 2081 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2082 error = ESPIPE; 2083 goto out; 2084 } 2085 2086 offset = SCARG(uap, offset); 2087 2088 /* 2089 * XXX This works because no file systems actually 2090 * XXX take any action on the seek operation. 2091 */ 2092 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2093 goto out; 2094 2095 /* dofilewritev() will unuse the descriptor for us */ 2096 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2097 &offset, 0, retval)); 2098 2099 out: 2100 FILE_UNUSE(fp, p); 2101 return (error); 2102 } 2103 2104 /* 2105 * Check access permissions. 2106 */ 2107 int 2108 sys_access(l, v, retval) 2109 struct lwp *l; 2110 void *v; 2111 register_t *retval; 2112 { 2113 struct sys_access_args /* { 2114 syscallarg(const char *) path; 2115 syscallarg(int) flags; 2116 } */ *uap = v; 2117 struct proc *p = l->l_proc; 2118 struct ucred *cred = crget(); 2119 struct vnode *vp; 2120 int error, flags; 2121 struct nameidata nd; 2122 2123 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 2124 cred->cr_ref = 1; 2125 cred->cr_uid = p->p_cred->p_ruid; 2126 cred->cr_gid = p->p_cred->p_rgid; 2127 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2128 SCARG(uap, path), p); 2129 /* Override default credentials */ 2130 nd.ni_cnd.cn_cred = cred; 2131 if ((error = namei(&nd)) != 0) 2132 goto out; 2133 vp = nd.ni_vp; 2134 2135 /* Flags == 0 means only check for existence. */ 2136 if (SCARG(uap, flags)) { 2137 flags = 0; 2138 if (SCARG(uap, flags) & R_OK) 2139 flags |= VREAD; 2140 if (SCARG(uap, flags) & W_OK) 2141 flags |= VWRITE; 2142 if (SCARG(uap, flags) & X_OK) 2143 flags |= VEXEC; 2144 2145 error = VOP_ACCESS(vp, flags, cred, p); 2146 if (!error && (flags & VWRITE)) 2147 error = vn_writechk(vp); 2148 } 2149 vput(vp); 2150 out: 2151 crfree(cred); 2152 return (error); 2153 } 2154 2155 /* 2156 * Get file status; this version follows links. 2157 */ 2158 /* ARGSUSED */ 2159 int 2160 sys___stat13(l, v, retval) 2161 struct lwp *l; 2162 void *v; 2163 register_t *retval; 2164 { 2165 struct sys___stat13_args /* { 2166 syscallarg(const char *) path; 2167 syscallarg(struct stat *) ub; 2168 } */ *uap = v; 2169 struct proc *p = l->l_proc; 2170 struct stat sb; 2171 int error; 2172 struct nameidata nd; 2173 2174 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2175 SCARG(uap, path), p); 2176 if ((error = namei(&nd)) != 0) 2177 return (error); 2178 error = vn_stat(nd.ni_vp, &sb, p); 2179 vput(nd.ni_vp); 2180 if (error) 2181 return (error); 2182 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2183 return (error); 2184 } 2185 2186 /* 2187 * Get file status; this version does not follow links. 2188 */ 2189 /* ARGSUSED */ 2190 int 2191 sys___lstat13(l, v, retval) 2192 struct lwp *l; 2193 void *v; 2194 register_t *retval; 2195 { 2196 struct sys___lstat13_args /* { 2197 syscallarg(const char *) path; 2198 syscallarg(struct stat *) ub; 2199 } */ *uap = v; 2200 struct proc *p = l->l_proc; 2201 struct stat sb; 2202 int error; 2203 struct nameidata nd; 2204 2205 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2206 SCARG(uap, path), p); 2207 if ((error = namei(&nd)) != 0) 2208 return (error); 2209 error = vn_stat(nd.ni_vp, &sb, p); 2210 vput(nd.ni_vp); 2211 if (error) 2212 return (error); 2213 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2214 return (error); 2215 } 2216 2217 /* 2218 * Get configurable pathname variables. 2219 */ 2220 /* ARGSUSED */ 2221 int 2222 sys_pathconf(l, v, retval) 2223 struct lwp *l; 2224 void *v; 2225 register_t *retval; 2226 { 2227 struct sys_pathconf_args /* { 2228 syscallarg(const char *) path; 2229 syscallarg(int) name; 2230 } */ *uap = v; 2231 struct proc *p = l->l_proc; 2232 int error; 2233 struct nameidata nd; 2234 2235 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2236 SCARG(uap, path), p); 2237 if ((error = namei(&nd)) != 0) 2238 return (error); 2239 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2240 vput(nd.ni_vp); 2241 return (error); 2242 } 2243 2244 /* 2245 * Return target name of a symbolic link. 2246 */ 2247 /* ARGSUSED */ 2248 int 2249 sys_readlink(l, v, retval) 2250 struct lwp *l; 2251 void *v; 2252 register_t *retval; 2253 { 2254 struct sys_readlink_args /* { 2255 syscallarg(const char *) path; 2256 syscallarg(char *) buf; 2257 syscallarg(size_t) count; 2258 } */ *uap = v; 2259 struct proc *p = l->l_proc; 2260 struct vnode *vp; 2261 struct iovec aiov; 2262 struct uio auio; 2263 int error; 2264 struct nameidata nd; 2265 2266 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2267 SCARG(uap, path), p); 2268 if ((error = namei(&nd)) != 0) 2269 return (error); 2270 vp = nd.ni_vp; 2271 if (vp->v_type != VLNK) 2272 error = EINVAL; 2273 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2274 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2275 aiov.iov_base = SCARG(uap, buf); 2276 aiov.iov_len = SCARG(uap, count); 2277 auio.uio_iov = &aiov; 2278 auio.uio_iovcnt = 1; 2279 auio.uio_offset = 0; 2280 auio.uio_rw = UIO_READ; 2281 auio.uio_segflg = UIO_USERSPACE; 2282 auio.uio_procp = p; 2283 auio.uio_resid = SCARG(uap, count); 2284 error = VOP_READLINK(vp, &auio, p->p_ucred); 2285 } 2286 vput(vp); 2287 *retval = SCARG(uap, count) - auio.uio_resid; 2288 return (error); 2289 } 2290 2291 /* 2292 * Change flags of a file given a path name. 2293 */ 2294 /* ARGSUSED */ 2295 int 2296 sys_chflags(l, v, retval) 2297 struct lwp *l; 2298 void *v; 2299 register_t *retval; 2300 { 2301 struct sys_chflags_args /* { 2302 syscallarg(const char *) path; 2303 syscallarg(u_long) flags; 2304 } */ *uap = v; 2305 struct proc *p = l->l_proc; 2306 struct vnode *vp; 2307 int error; 2308 struct nameidata nd; 2309 2310 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2311 if ((error = namei(&nd)) != 0) 2312 return (error); 2313 vp = nd.ni_vp; 2314 error = change_flags(vp, SCARG(uap, flags), p); 2315 vput(vp); 2316 return (error); 2317 } 2318 2319 /* 2320 * Change flags of a file given a file descriptor. 2321 */ 2322 /* ARGSUSED */ 2323 int 2324 sys_fchflags(l, v, retval) 2325 struct lwp *l; 2326 void *v; 2327 register_t *retval; 2328 { 2329 struct sys_fchflags_args /* { 2330 syscallarg(int) fd; 2331 syscallarg(u_long) flags; 2332 } */ *uap = v; 2333 struct proc *p = l->l_proc; 2334 struct vnode *vp; 2335 struct file *fp; 2336 int error; 2337 2338 /* getvnode() will use the descriptor for us */ 2339 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2340 return (error); 2341 vp = (struct vnode *)fp->f_data; 2342 error = change_flags(vp, SCARG(uap, flags), p); 2343 VOP_UNLOCK(vp, 0); 2344 FILE_UNUSE(fp, p); 2345 return (error); 2346 } 2347 2348 /* 2349 * Change flags of a file given a path name; this version does 2350 * not follow links. 2351 */ 2352 int 2353 sys_lchflags(l, v, retval) 2354 struct lwp *l; 2355 void *v; 2356 register_t *retval; 2357 { 2358 struct sys_lchflags_args /* { 2359 syscallarg(const char *) path; 2360 syscallarg(u_long) flags; 2361 } */ *uap = v; 2362 struct proc *p = l->l_proc; 2363 struct vnode *vp; 2364 int error; 2365 struct nameidata nd; 2366 2367 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2368 if ((error = namei(&nd)) != 0) 2369 return (error); 2370 vp = nd.ni_vp; 2371 error = change_flags(vp, SCARG(uap, flags), p); 2372 vput(vp); 2373 return (error); 2374 } 2375 2376 /* 2377 * Common routine to change flags of a file. 2378 */ 2379 int 2380 change_flags(vp, flags, p) 2381 struct vnode *vp; 2382 u_long flags; 2383 struct proc *p; 2384 { 2385 struct mount *mp; 2386 struct vattr vattr; 2387 int error; 2388 2389 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2390 return (error); 2391 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2392 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2393 /* 2394 * Non-superusers cannot change the flags on devices, even if they 2395 * own them. 2396 */ 2397 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2398 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2399 goto out; 2400 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2401 error = EINVAL; 2402 goto out; 2403 } 2404 } 2405 VATTR_NULL(&vattr); 2406 vattr.va_flags = flags; 2407 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2408 out: 2409 vn_finished_write(mp, 0); 2410 return (error); 2411 } 2412 2413 /* 2414 * Change mode of a file given path name; this version follows links. 2415 */ 2416 /* ARGSUSED */ 2417 int 2418 sys_chmod(l, v, retval) 2419 struct lwp *l; 2420 void *v; 2421 register_t *retval; 2422 { 2423 struct sys_chmod_args /* { 2424 syscallarg(const char *) path; 2425 syscallarg(int) mode; 2426 } */ *uap = v; 2427 struct proc *p = l->l_proc; 2428 int error; 2429 struct nameidata nd; 2430 2431 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2432 if ((error = namei(&nd)) != 0) 2433 return (error); 2434 2435 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2436 2437 vrele(nd.ni_vp); 2438 return (error); 2439 } 2440 2441 /* 2442 * Change mode of a file given a file descriptor. 2443 */ 2444 /* ARGSUSED */ 2445 int 2446 sys_fchmod(l, v, retval) 2447 struct lwp *l; 2448 void *v; 2449 register_t *retval; 2450 { 2451 struct sys_fchmod_args /* { 2452 syscallarg(int) fd; 2453 syscallarg(int) mode; 2454 } */ *uap = v; 2455 struct proc *p = l->l_proc; 2456 struct file *fp; 2457 int error; 2458 2459 /* getvnode() will use the descriptor for us */ 2460 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2461 return (error); 2462 2463 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2464 FILE_UNUSE(fp, p); 2465 return (error); 2466 } 2467 2468 /* 2469 * Change mode of a file given path name; this version does not follow links. 2470 */ 2471 /* ARGSUSED */ 2472 int 2473 sys_lchmod(l, v, retval) 2474 struct lwp *l; 2475 void *v; 2476 register_t *retval; 2477 { 2478 struct sys_lchmod_args /* { 2479 syscallarg(const char *) path; 2480 syscallarg(int) mode; 2481 } */ *uap = v; 2482 struct proc *p = l->l_proc; 2483 int error; 2484 struct nameidata nd; 2485 2486 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2487 if ((error = namei(&nd)) != 0) 2488 return (error); 2489 2490 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2491 2492 vrele(nd.ni_vp); 2493 return (error); 2494 } 2495 2496 /* 2497 * Common routine to set mode given a vnode. 2498 */ 2499 static int 2500 change_mode(vp, mode, p) 2501 struct vnode *vp; 2502 int mode; 2503 struct proc *p; 2504 { 2505 struct mount *mp; 2506 struct vattr vattr; 2507 int error; 2508 2509 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2510 return (error); 2511 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2512 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2513 VATTR_NULL(&vattr); 2514 vattr.va_mode = mode & ALLPERMS; 2515 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2516 VOP_UNLOCK(vp, 0); 2517 vn_finished_write(mp, 0); 2518 return (error); 2519 } 2520 2521 /* 2522 * Set ownership given a path name; this version follows links. 2523 */ 2524 /* ARGSUSED */ 2525 int 2526 sys_chown(l, v, retval) 2527 struct lwp *l; 2528 void *v; 2529 register_t *retval; 2530 { 2531 struct sys_chown_args /* { 2532 syscallarg(const char *) path; 2533 syscallarg(uid_t) uid; 2534 syscallarg(gid_t) gid; 2535 } */ *uap = v; 2536 struct proc *p = l->l_proc; 2537 int error; 2538 struct nameidata nd; 2539 2540 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2541 if ((error = namei(&nd)) != 0) 2542 return (error); 2543 2544 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2545 2546 vrele(nd.ni_vp); 2547 return (error); 2548 } 2549 2550 /* 2551 * Set ownership given a path name; this version follows links. 2552 * Provides POSIX semantics. 2553 */ 2554 /* ARGSUSED */ 2555 int 2556 sys___posix_chown(l, v, retval) 2557 struct lwp *l; 2558 void *v; 2559 register_t *retval; 2560 { 2561 struct sys_chown_args /* { 2562 syscallarg(const char *) path; 2563 syscallarg(uid_t) uid; 2564 syscallarg(gid_t) gid; 2565 } */ *uap = v; 2566 struct proc *p = l->l_proc; 2567 int error; 2568 struct nameidata nd; 2569 2570 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2571 if ((error = namei(&nd)) != 0) 2572 return (error); 2573 2574 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2575 2576 vrele(nd.ni_vp); 2577 return (error); 2578 } 2579 2580 /* 2581 * Set ownership given a file descriptor. 2582 */ 2583 /* ARGSUSED */ 2584 int 2585 sys_fchown(l, v, retval) 2586 struct lwp *l; 2587 void *v; 2588 register_t *retval; 2589 { 2590 struct sys_fchown_args /* { 2591 syscallarg(int) fd; 2592 syscallarg(uid_t) uid; 2593 syscallarg(gid_t) gid; 2594 } */ *uap = v; 2595 struct proc *p = l->l_proc; 2596 int error; 2597 struct file *fp; 2598 2599 /* getvnode() will use the descriptor for us */ 2600 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2601 return (error); 2602 2603 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2604 SCARG(uap, gid), p, 0); 2605 FILE_UNUSE(fp, p); 2606 return (error); 2607 } 2608 2609 /* 2610 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2611 */ 2612 /* ARGSUSED */ 2613 int 2614 sys___posix_fchown(l, v, retval) 2615 struct lwp *l; 2616 void *v; 2617 register_t *retval; 2618 { 2619 struct sys_fchown_args /* { 2620 syscallarg(int) fd; 2621 syscallarg(uid_t) uid; 2622 syscallarg(gid_t) gid; 2623 } */ *uap = v; 2624 struct proc *p = l->l_proc; 2625 int error; 2626 struct file *fp; 2627 2628 /* getvnode() will use the descriptor for us */ 2629 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2630 return (error); 2631 2632 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2633 SCARG(uap, gid), p, 1); 2634 FILE_UNUSE(fp, p); 2635 return (error); 2636 } 2637 2638 /* 2639 * Set ownership given a path name; this version does not follow links. 2640 */ 2641 /* ARGSUSED */ 2642 int 2643 sys_lchown(l, v, retval) 2644 struct lwp *l; 2645 void *v; 2646 register_t *retval; 2647 { 2648 struct sys_lchown_args /* { 2649 syscallarg(const char *) path; 2650 syscallarg(uid_t) uid; 2651 syscallarg(gid_t) gid; 2652 } */ *uap = v; 2653 struct proc *p = l->l_proc; 2654 int error; 2655 struct nameidata nd; 2656 2657 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2658 if ((error = namei(&nd)) != 0) 2659 return (error); 2660 2661 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2662 2663 vrele(nd.ni_vp); 2664 return (error); 2665 } 2666 2667 /* 2668 * Set ownership given a path name; this version does not follow links. 2669 * Provides POSIX/XPG semantics. 2670 */ 2671 /* ARGSUSED */ 2672 int 2673 sys___posix_lchown(l, v, retval) 2674 struct lwp *l; 2675 void *v; 2676 register_t *retval; 2677 { 2678 struct sys_lchown_args /* { 2679 syscallarg(const char *) path; 2680 syscallarg(uid_t) uid; 2681 syscallarg(gid_t) gid; 2682 } */ *uap = v; 2683 struct proc *p = l->l_proc; 2684 int error; 2685 struct nameidata nd; 2686 2687 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2688 if ((error = namei(&nd)) != 0) 2689 return (error); 2690 2691 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2692 2693 vrele(nd.ni_vp); 2694 return (error); 2695 } 2696 2697 /* 2698 * Common routine to set ownership given a vnode. 2699 */ 2700 static int 2701 change_owner(vp, uid, gid, p, posix_semantics) 2702 struct vnode *vp; 2703 uid_t uid; 2704 gid_t gid; 2705 struct proc *p; 2706 int posix_semantics; 2707 { 2708 struct mount *mp; 2709 struct vattr vattr; 2710 mode_t newmode; 2711 int error; 2712 2713 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2714 return (error); 2715 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2716 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2717 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2718 goto out; 2719 2720 #define CHANGED(x) ((int)(x) != -1) 2721 newmode = vattr.va_mode; 2722 if (posix_semantics) { 2723 /* 2724 * POSIX/XPG semantics: if the caller is not the super-user, 2725 * clear set-user-id and set-group-id bits. Both POSIX and 2726 * the XPG consider the behaviour for calls by the super-user 2727 * implementation-defined; we leave the set-user-id and set- 2728 * group-id settings intact in that case. 2729 */ 2730 if (suser(p->p_ucred, NULL) != 0) 2731 newmode &= ~(S_ISUID | S_ISGID); 2732 } else { 2733 /* 2734 * NetBSD semantics: when changing owner and/or group, 2735 * clear the respective bit(s). 2736 */ 2737 if (CHANGED(uid)) 2738 newmode &= ~S_ISUID; 2739 if (CHANGED(gid)) 2740 newmode &= ~S_ISGID; 2741 } 2742 /* Update va_mode iff altered. */ 2743 if (vattr.va_mode == newmode) 2744 newmode = VNOVAL; 2745 2746 VATTR_NULL(&vattr); 2747 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2748 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2749 vattr.va_mode = newmode; 2750 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2751 #undef CHANGED 2752 2753 out: 2754 VOP_UNLOCK(vp, 0); 2755 vn_finished_write(mp, 0); 2756 return (error); 2757 } 2758 2759 /* 2760 * Set the access and modification times given a path name; this 2761 * version follows links. 2762 */ 2763 /* ARGSUSED */ 2764 int 2765 sys_utimes(l, v, retval) 2766 struct lwp *l; 2767 void *v; 2768 register_t *retval; 2769 { 2770 struct sys_utimes_args /* { 2771 syscallarg(const char *) path; 2772 syscallarg(const struct timeval *) tptr; 2773 } */ *uap = v; 2774 struct proc *p = l->l_proc; 2775 int error; 2776 struct nameidata nd; 2777 2778 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2779 if ((error = namei(&nd)) != 0) 2780 return (error); 2781 2782 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2783 2784 vrele(nd.ni_vp); 2785 return (error); 2786 } 2787 2788 /* 2789 * Set the access and modification times given a file descriptor. 2790 */ 2791 /* ARGSUSED */ 2792 int 2793 sys_futimes(l, v, retval) 2794 struct lwp *l; 2795 void *v; 2796 register_t *retval; 2797 { 2798 struct sys_futimes_args /* { 2799 syscallarg(int) fd; 2800 syscallarg(const struct timeval *) tptr; 2801 } */ *uap = v; 2802 struct proc *p = l->l_proc; 2803 int error; 2804 struct file *fp; 2805 2806 /* getvnode() will use the descriptor for us */ 2807 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2808 return (error); 2809 2810 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2811 FILE_UNUSE(fp, p); 2812 return (error); 2813 } 2814 2815 /* 2816 * Set the access and modification times given a path name; this 2817 * version does not follow links. 2818 */ 2819 /* ARGSUSED */ 2820 int 2821 sys_lutimes(l, v, retval) 2822 struct lwp *l; 2823 void *v; 2824 register_t *retval; 2825 { 2826 struct sys_lutimes_args /* { 2827 syscallarg(const char *) path; 2828 syscallarg(const struct timeval *) tptr; 2829 } */ *uap = v; 2830 struct proc *p = l->l_proc; 2831 int error; 2832 struct nameidata nd; 2833 2834 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2835 if ((error = namei(&nd)) != 0) 2836 return (error); 2837 2838 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2839 2840 vrele(nd.ni_vp); 2841 return (error); 2842 } 2843 2844 /* 2845 * Common routine to set access and modification times given a vnode. 2846 */ 2847 static int 2848 change_utimes(vp, tptr, p) 2849 struct vnode *vp; 2850 const struct timeval *tptr; 2851 struct proc *p; 2852 { 2853 struct timeval tv[2]; 2854 struct mount *mp; 2855 struct vattr vattr; 2856 int error; 2857 2858 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2859 return (error); 2860 VATTR_NULL(&vattr); 2861 if (tptr == NULL) { 2862 microtime(&tv[0]); 2863 tv[1] = tv[0]; 2864 vattr.va_vaflags |= VA_UTIMES_NULL; 2865 } else { 2866 error = copyin(tptr, tv, sizeof(tv)); 2867 if (error) 2868 goto out; 2869 } 2870 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2871 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2872 vattr.va_atime.tv_sec = tv[0].tv_sec; 2873 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2874 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2875 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2876 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2877 VOP_UNLOCK(vp, 0); 2878 out: 2879 vn_finished_write(mp, 0); 2880 return (error); 2881 } 2882 2883 /* 2884 * Truncate a file given its path name. 2885 */ 2886 /* ARGSUSED */ 2887 int 2888 sys_truncate(l, v, retval) 2889 struct lwp *l; 2890 void *v; 2891 register_t *retval; 2892 { 2893 struct sys_truncate_args /* { 2894 syscallarg(const char *) path; 2895 syscallarg(int) pad; 2896 syscallarg(off_t) length; 2897 } */ *uap = v; 2898 struct proc *p = l->l_proc; 2899 struct vnode *vp; 2900 struct mount *mp; 2901 struct vattr vattr; 2902 int error; 2903 struct nameidata nd; 2904 2905 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2906 if ((error = namei(&nd)) != 0) 2907 return (error); 2908 vp = nd.ni_vp; 2909 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2910 vrele(vp); 2911 return (error); 2912 } 2913 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2914 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2915 if (vp->v_type == VDIR) 2916 error = EISDIR; 2917 else if ((error = vn_writechk(vp)) == 0 && 2918 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2919 VATTR_NULL(&vattr); 2920 vattr.va_size = SCARG(uap, length); 2921 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2922 } 2923 vput(vp); 2924 vn_finished_write(mp, 0); 2925 return (error); 2926 } 2927 2928 /* 2929 * Truncate a file given a file descriptor. 2930 */ 2931 /* ARGSUSED */ 2932 int 2933 sys_ftruncate(l, v, retval) 2934 struct lwp *l; 2935 void *v; 2936 register_t *retval; 2937 { 2938 struct sys_ftruncate_args /* { 2939 syscallarg(int) fd; 2940 syscallarg(int) pad; 2941 syscallarg(off_t) length; 2942 } */ *uap = v; 2943 struct proc *p = l->l_proc; 2944 struct mount *mp; 2945 struct vattr vattr; 2946 struct vnode *vp; 2947 struct file *fp; 2948 int error; 2949 2950 /* getvnode() will use the descriptor for us */ 2951 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2952 return (error); 2953 if ((fp->f_flag & FWRITE) == 0) { 2954 error = EINVAL; 2955 goto out; 2956 } 2957 vp = (struct vnode *)fp->f_data; 2958 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2959 FILE_UNUSE(fp, p); 2960 return (error); 2961 } 2962 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2963 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2964 if (vp->v_type == VDIR) 2965 error = EISDIR; 2966 else if ((error = vn_writechk(vp)) == 0) { 2967 VATTR_NULL(&vattr); 2968 vattr.va_size = SCARG(uap, length); 2969 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2970 } 2971 VOP_UNLOCK(vp, 0); 2972 vn_finished_write(mp, 0); 2973 out: 2974 FILE_UNUSE(fp, p); 2975 return (error); 2976 } 2977 2978 /* 2979 * Sync an open file. 2980 */ 2981 /* ARGSUSED */ 2982 int 2983 sys_fsync(l, v, retval) 2984 struct lwp *l; 2985 void *v; 2986 register_t *retval; 2987 { 2988 struct sys_fsync_args /* { 2989 syscallarg(int) fd; 2990 } */ *uap = v; 2991 struct proc *p = l->l_proc; 2992 struct vnode *vp; 2993 struct mount *mp; 2994 struct file *fp; 2995 int error; 2996 2997 /* getvnode() will use the descriptor for us */ 2998 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2999 return (error); 3000 vp = (struct vnode *)fp->f_data; 3001 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3002 FILE_UNUSE(fp, p); 3003 return (error); 3004 } 3005 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3006 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 3007 if (error == 0 && bioops.io_fsync != NULL && 3008 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3009 (*bioops.io_fsync)(vp); 3010 VOP_UNLOCK(vp, 0); 3011 vn_finished_write(mp, 0); 3012 FILE_UNUSE(fp, p); 3013 return (error); 3014 } 3015 3016 /* 3017 * Sync a range of file data. API modeled after that found in AIX. 3018 * 3019 * FDATASYNC indicates that we need only save enough metadata to be able 3020 * to re-read the written data. Note we duplicate AIX's requirement that 3021 * the file be open for writing. 3022 */ 3023 /* ARGSUSED */ 3024 int 3025 sys_fsync_range(l, v, retval) 3026 struct lwp *l; 3027 void *v; 3028 register_t *retval; 3029 { 3030 struct sys_fsync_range_args /* { 3031 syscallarg(int) fd; 3032 syscallarg(int) flags; 3033 syscallarg(off_t) start; 3034 syscallarg(int) length; 3035 } */ *uap = v; 3036 struct proc *p = l->l_proc; 3037 struct vnode *vp; 3038 struct file *fp; 3039 int flags, nflags; 3040 off_t s, e, len; 3041 int error; 3042 3043 /* getvnode() will use the descriptor for us */ 3044 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3045 return (error); 3046 3047 if ((fp->f_flag & FWRITE) == 0) { 3048 FILE_UNUSE(fp, p); 3049 return (EBADF); 3050 } 3051 3052 flags = SCARG(uap, flags); 3053 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3054 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3055 return (EINVAL); 3056 } 3057 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3058 if (flags & FDATASYNC) 3059 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3060 else 3061 nflags = FSYNC_WAIT; 3062 3063 len = SCARG(uap, length); 3064 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3065 if (len) { 3066 s = SCARG(uap, start); 3067 e = s + len; 3068 if (e < s) { 3069 FILE_UNUSE(fp, p); 3070 return (EINVAL); 3071 } 3072 } else { 3073 e = 0; 3074 s = 0; 3075 } 3076 3077 vp = (struct vnode *)fp->f_data; 3078 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3079 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, p); 3080 3081 if (error == 0 && bioops.io_fsync != NULL && 3082 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3083 (*bioops.io_fsync)(vp); 3084 3085 VOP_UNLOCK(vp, 0); 3086 FILE_UNUSE(fp, p); 3087 return (error); 3088 } 3089 3090 /* 3091 * Sync the data of an open file. 3092 */ 3093 /* ARGSUSED */ 3094 int 3095 sys_fdatasync(l, v, retval) 3096 struct lwp *l; 3097 void *v; 3098 register_t *retval; 3099 { 3100 struct sys_fdatasync_args /* { 3101 syscallarg(int) fd; 3102 } */ *uap = v; 3103 struct proc *p = l->l_proc; 3104 struct vnode *vp; 3105 struct file *fp; 3106 int error; 3107 3108 /* getvnode() will use the descriptor for us */ 3109 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3110 return (error); 3111 if ((fp->f_flag & FWRITE) == 0) { 3112 FILE_UNUSE(fp, p); 3113 return (EBADF); 3114 } 3115 vp = (struct vnode *)fp->f_data; 3116 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3117 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 3118 VOP_UNLOCK(vp, 0); 3119 FILE_UNUSE(fp, p); 3120 return (error); 3121 } 3122 3123 /* 3124 * Rename files, (standard) BSD semantics frontend. 3125 */ 3126 /* ARGSUSED */ 3127 int 3128 sys_rename(l, v, retval) 3129 struct lwp *l; 3130 void *v; 3131 register_t *retval; 3132 { 3133 struct sys_rename_args /* { 3134 syscallarg(const char *) from; 3135 syscallarg(const char *) to; 3136 } */ *uap = v; 3137 struct proc *p = l->l_proc; 3138 3139 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 3140 } 3141 3142 /* 3143 * Rename files, POSIX semantics frontend. 3144 */ 3145 /* ARGSUSED */ 3146 int 3147 sys___posix_rename(l, v, retval) 3148 struct lwp *l; 3149 void *v; 3150 register_t *retval; 3151 { 3152 struct sys___posix_rename_args /* { 3153 syscallarg(const char *) from; 3154 syscallarg(const char *) to; 3155 } */ *uap = v; 3156 struct proc *p = l->l_proc; 3157 3158 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 3159 } 3160 3161 /* 3162 * Rename files. Source and destination must either both be directories, 3163 * or both not be directories. If target is a directory, it must be empty. 3164 * If `from' and `to' refer to the same object, the value of the `retain' 3165 * argument is used to determine whether `from' will be 3166 * 3167 * (retain == 0) deleted unless `from' and `to' refer to the same 3168 * object in the file system's name space (BSD). 3169 * (retain == 1) always retained (POSIX). 3170 */ 3171 static int 3172 rename_files(from, to, p, retain) 3173 const char *from, *to; 3174 struct proc *p; 3175 int retain; 3176 { 3177 struct mount *mp = NULL; 3178 struct vnode *tvp, *fvp, *tdvp; 3179 struct nameidata fromnd, tond; 3180 int error; 3181 3182 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 3183 from, p); 3184 if ((error = namei(&fromnd)) != 0) 3185 return (error); 3186 fvp = fromnd.ni_vp; 3187 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3188 if (error != 0) { 3189 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3190 vrele(fromnd.ni_dvp); 3191 vrele(fvp); 3192 if (fromnd.ni_startdir) 3193 vrele(fromnd.ni_startdir); 3194 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3195 return (error); 3196 } 3197 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3198 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p); 3199 if ((error = namei(&tond)) != 0) { 3200 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3201 vrele(fromnd.ni_dvp); 3202 vrele(fvp); 3203 goto out1; 3204 } 3205 tdvp = tond.ni_dvp; 3206 tvp = tond.ni_vp; 3207 3208 if (tvp != NULL) { 3209 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3210 error = ENOTDIR; 3211 goto out; 3212 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3213 error = EISDIR; 3214 goto out; 3215 } 3216 } 3217 3218 if (fvp == tdvp) 3219 error = EINVAL; 3220 3221 /* 3222 * Source and destination refer to the same object. 3223 */ 3224 if (fvp == tvp) { 3225 if (retain) 3226 error = -1; 3227 else if (fromnd.ni_dvp == tdvp && 3228 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3229 !memcmp(fromnd.ni_cnd.cn_nameptr, 3230 tond.ni_cnd.cn_nameptr, 3231 fromnd.ni_cnd.cn_namelen)) 3232 error = -1; 3233 } 3234 3235 out: 3236 if (!error) { 3237 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 3238 if (fromnd.ni_dvp != tdvp) 3239 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3240 if (tvp) { 3241 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3242 } 3243 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3244 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3245 } else { 3246 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3247 if (tdvp == tvp) 3248 vrele(tdvp); 3249 else 3250 vput(tdvp); 3251 if (tvp) 3252 vput(tvp); 3253 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3254 vrele(fromnd.ni_dvp); 3255 vrele(fvp); 3256 } 3257 vrele(tond.ni_startdir); 3258 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3259 out1: 3260 vn_finished_write(mp, 0); 3261 if (fromnd.ni_startdir) 3262 vrele(fromnd.ni_startdir); 3263 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3264 return (error == -1 ? 0 : error); 3265 } 3266 3267 /* 3268 * Make a directory file. 3269 */ 3270 /* ARGSUSED */ 3271 int 3272 sys_mkdir(l, v, retval) 3273 struct lwp *l; 3274 void *v; 3275 register_t *retval; 3276 { 3277 struct sys_mkdir_args /* { 3278 syscallarg(const char *) path; 3279 syscallarg(int) mode; 3280 } */ *uap = v; 3281 struct proc *p = l->l_proc; 3282 struct mount *mp; 3283 struct vnode *vp; 3284 struct vattr vattr; 3285 int error; 3286 struct nameidata nd; 3287 3288 restart: 3289 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3290 SCARG(uap, path), p); 3291 if ((error = namei(&nd)) != 0) 3292 return (error); 3293 vp = nd.ni_vp; 3294 if (vp != NULL) { 3295 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3296 if (nd.ni_dvp == vp) 3297 vrele(nd.ni_dvp); 3298 else 3299 vput(nd.ni_dvp); 3300 vrele(vp); 3301 return (EEXIST); 3302 } 3303 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3304 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3305 if (nd.ni_dvp == vp) 3306 vrele(nd.ni_dvp); 3307 else 3308 vput(nd.ni_dvp); 3309 if ((error = vn_start_write(NULL, &mp, 3310 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3311 return (error); 3312 goto restart; 3313 } 3314 VATTR_NULL(&vattr); 3315 vattr.va_type = VDIR; 3316 vattr.va_mode = 3317 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3318 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3319 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3320 if (!error) 3321 vput(nd.ni_vp); 3322 vn_finished_write(mp, 0); 3323 return (error); 3324 } 3325 3326 /* 3327 * Remove a directory file. 3328 */ 3329 /* ARGSUSED */ 3330 int 3331 sys_rmdir(l, v, retval) 3332 struct lwp *l; 3333 void *v; 3334 register_t *retval; 3335 { 3336 struct sys_rmdir_args /* { 3337 syscallarg(const char *) path; 3338 } */ *uap = v; 3339 struct proc *p = l->l_proc; 3340 struct mount *mp; 3341 struct vnode *vp; 3342 int error; 3343 struct nameidata nd; 3344 3345 restart: 3346 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3347 SCARG(uap, path), p); 3348 if ((error = namei(&nd)) != 0) 3349 return (error); 3350 vp = nd.ni_vp; 3351 if (vp->v_type != VDIR) { 3352 error = ENOTDIR; 3353 goto out; 3354 } 3355 /* 3356 * No rmdir "." please. 3357 */ 3358 if (nd.ni_dvp == vp) { 3359 error = EINVAL; 3360 goto out; 3361 } 3362 /* 3363 * The root of a mounted filesystem cannot be deleted. 3364 */ 3365 if (vp->v_flag & VROOT) { 3366 error = EBUSY; 3367 goto out; 3368 } 3369 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3370 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3371 if (nd.ni_dvp == vp) 3372 vrele(nd.ni_dvp); 3373 else 3374 vput(nd.ni_dvp); 3375 vput(vp); 3376 if ((error = vn_start_write(NULL, &mp, 3377 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3378 return (error); 3379 goto restart; 3380 } 3381 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3382 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3383 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3384 vn_finished_write(mp, 0); 3385 return (error); 3386 3387 out: 3388 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3389 if (nd.ni_dvp == vp) 3390 vrele(nd.ni_dvp); 3391 else 3392 vput(nd.ni_dvp); 3393 vput(vp); 3394 return (error); 3395 } 3396 3397 /* 3398 * Read a block of directory entries in a file system independent format. 3399 */ 3400 int 3401 sys_getdents(l, v, retval) 3402 struct lwp *l; 3403 void *v; 3404 register_t *retval; 3405 { 3406 struct sys_getdents_args /* { 3407 syscallarg(int) fd; 3408 syscallarg(char *) buf; 3409 syscallarg(size_t) count; 3410 } */ *uap = v; 3411 struct proc *p = l->l_proc; 3412 struct file *fp; 3413 int error, done; 3414 3415 /* getvnode() will use the descriptor for us */ 3416 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3417 return (error); 3418 if ((fp->f_flag & FREAD) == 0) { 3419 error = EBADF; 3420 goto out; 3421 } 3422 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3423 SCARG(uap, count), &done, p, 0, 0); 3424 #ifdef KTRACE 3425 if (!error && KTRPOINT(p, KTR_GENIO)) { 3426 struct iovec iov; 3427 iov.iov_base = SCARG(uap, buf); 3428 iov.iov_len = done; 3429 ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3430 } 3431 #endif 3432 *retval = done; 3433 out: 3434 FILE_UNUSE(fp, p); 3435 return (error); 3436 } 3437 3438 /* 3439 * Set the mode mask for creation of filesystem nodes. 3440 */ 3441 int 3442 sys_umask(l, v, retval) 3443 struct lwp *l; 3444 void *v; 3445 register_t *retval; 3446 { 3447 struct sys_umask_args /* { 3448 syscallarg(mode_t) newmask; 3449 } */ *uap = v; 3450 struct proc *p = l->l_proc; 3451 struct cwdinfo *cwdi; 3452 3453 cwdi = p->p_cwdi; 3454 *retval = cwdi->cwdi_cmask; 3455 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3456 return (0); 3457 } 3458 3459 /* 3460 * Void all references to file by ripping underlying filesystem 3461 * away from vnode. 3462 */ 3463 /* ARGSUSED */ 3464 int 3465 sys_revoke(l, v, retval) 3466 struct lwp *l; 3467 void *v; 3468 register_t *retval; 3469 { 3470 struct sys_revoke_args /* { 3471 syscallarg(const char *) path; 3472 } */ *uap = v; 3473 struct proc *p = l->l_proc; 3474 struct mount *mp; 3475 struct vnode *vp; 3476 struct vattr vattr; 3477 int error; 3478 struct nameidata nd; 3479 3480 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3481 if ((error = namei(&nd)) != 0) 3482 return (error); 3483 vp = nd.ni_vp; 3484 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3485 goto out; 3486 if (p->p_ucred->cr_uid != vattr.va_uid && 3487 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3488 goto out; 3489 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3490 goto out; 3491 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3492 VOP_REVOKE(vp, REVOKEALL); 3493 vn_finished_write(mp, 0); 3494 out: 3495 vrele(vp); 3496 return (error); 3497 } 3498 3499 /* 3500 * Convert a user file descriptor to a kernel file entry. 3501 */ 3502 int 3503 getvnode(fdp, fd, fpp) 3504 struct filedesc *fdp; 3505 int fd; 3506 struct file **fpp; 3507 { 3508 struct vnode *vp; 3509 struct file *fp; 3510 3511 if ((fp = fd_getfile(fdp, fd)) == NULL) 3512 return (EBADF); 3513 3514 FILE_USE(fp); 3515 3516 if (fp->f_type != DTYPE_VNODE) { 3517 FILE_UNUSE(fp, NULL); 3518 return (EINVAL); 3519 } 3520 3521 vp = (struct vnode *)fp->f_data; 3522 if (vp->v_type == VBAD) { 3523 FILE_UNUSE(fp, NULL); 3524 return (EBADF); 3525 } 3526 3527 *fpp = fp; 3528 return (0); 3529 } 3530
Indexes created Wed Sep 24 05:09:52 GMT 2025