vfs_syscalls.c revision 1.217.2.12
1 /* $NetBSD: vfs_syscalls.c,v 1.217.2.12 2007/06/26 16:57:39 ghen 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 1.217.2.12 2007/06/26 16:57:39 ghen 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/extattr.h> 62 #include <sys/sysctl.h> 63 #include <sys/sa.h> 64 #include <sys/syscallargs.h> 65 #ifdef KTRACE 66 #include <sys/ktrace.h> 67 #endif 68 #ifdef VERIFIED_EXEC 69 #include <sys/verified_exec.h> 70 #endif /* VERIFIED_EXEC */ 71 72 #include <miscfs/genfs/genfs.h> 73 #include <miscfs/syncfs/syncfs.h> 74 75 #if NFSS > 0 76 #include <dev/fssvar.h> 77 #endif 78 79 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 80 81 static int change_dir(struct nameidata *, struct proc *); 82 static int change_flags(struct vnode *, u_long, struct proc *); 83 static int change_mode(struct vnode *, int, struct proc *p); 84 static int change_owner(struct vnode *, uid_t, gid_t, struct proc *, int); 85 static int change_utimes(struct vnode *vp, const struct timeval *, 86 struct proc *p); 87 static int rename_files(const char *, const char *, struct proc *, int); 88 89 void checkdirs(struct vnode *); 90 91 int dovfsusermount = 0; 92 93 /* 94 * Virtual File System System Calls 95 */ 96 97 /* 98 * Mount a file system. 99 */ 100 101 #if defined(COMPAT_09) || defined(COMPAT_43) 102 /* 103 * This table is used to maintain compatibility with 4.3BSD 104 * and NetBSD 0.9 mount syscalls. Note, the order is important! 105 * 106 * Do not modify this table. It should only contain filesystems 107 * supported by NetBSD 0.9 and 4.3BSD. 108 */ 109 const char * const mountcompatnames[] = { 110 NULL, /* 0 = MOUNT_NONE */ 111 MOUNT_FFS, /* 1 = MOUNT_UFS */ 112 MOUNT_NFS, /* 2 */ 113 MOUNT_MFS, /* 3 */ 114 MOUNT_MSDOS, /* 4 */ 115 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 116 MOUNT_FDESC, /* 6 */ 117 MOUNT_KERNFS, /* 7 */ 118 NULL, /* 8 = MOUNT_DEVFS */ 119 MOUNT_AFS, /* 9 */ 120 }; 121 const int nmountcompatnames = sizeof(mountcompatnames) / 122 sizeof(mountcompatnames[0]); 123 #endif /* COMPAT_09 || COMPAT_43 */ 124 125 /* ARGSUSED */ 126 int 127 sys_mount(l, v, retval) 128 struct lwp *l; 129 void *v; 130 register_t *retval; 131 { 132 struct sys_mount_args /* { 133 syscallarg(const char *) type; 134 syscallarg(const char *) path; 135 syscallarg(int) flags; 136 syscallarg(void *) data; 137 } */ *uap = v; 138 struct proc *p = l->l_proc; 139 struct vnode *vp; 140 struct mount *mp; 141 int error, flag = 0; 142 char fstypename[MFSNAMELEN]; 143 struct vattr va; 144 struct nameidata nd; 145 struct vfsops *vfs; 146 147 /* 148 * if MNT_GETARGS is specified, it should be only flag. 149 */ 150 151 if ((SCARG(uap, flags) & MNT_GETARGS) != 0 && 152 (SCARG(uap, flags) & ~MNT_GETARGS) != 0) { 153 return EINVAL; 154 } 155 156 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 157 (error = suser(p->p_ucred, &p->p_acflag))) 158 return (error); 159 /* 160 * Get vnode to be covered 161 */ 162 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 163 SCARG(uap, path), p); 164 if ((error = namei(&nd)) != 0) 165 return (error); 166 vp = nd.ni_vp; 167 /* 168 * A lookup in VFS_MOUNT might result in an attempt to 169 * lock this vnode again, so make the lock recursive. 170 */ 171 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 172 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 173 if ((vp->v_flag & VROOT) == 0) { 174 vput(vp); 175 return (EINVAL); 176 } 177 mp = vp->v_mount; 178 flag = mp->mnt_flag; 179 vfs = mp->mnt_op; 180 /* 181 * We only allow the filesystem to be reloaded if it 182 * is currently mounted read-only. 183 */ 184 if ((SCARG(uap, flags) & MNT_RELOAD) && 185 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 186 vput(vp); 187 return (EOPNOTSUPP); /* Needs translation */ 188 } 189 /* 190 * In "highly secure" mode, don't let the caller do anything 191 * but downgrade a filesystem from read-write to read-only. 192 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 193 */ 194 if (securelevel >= 2 && 195 SCARG(uap, flags) != MNT_GETARGS && 196 SCARG(uap, flags) != 197 (mp->mnt_flag | MNT_RDONLY | 198 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 199 vput(vp); 200 return (EPERM); 201 } 202 mp->mnt_flag |= SCARG(uap, flags) & 203 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 204 /* 205 * Only root, or the user that did the original mount is 206 * permitted to update it. 207 */ 208 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 209 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 210 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 211 vput(vp); 212 return (error); 213 } 214 /* 215 * Do not allow NFS export by non-root users. For non-root 216 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 217 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 218 */ 219 if (p->p_ucred->cr_uid != 0) { 220 if (SCARG(uap, flags) & MNT_EXPORTED) { 221 vput(vp); 222 return (EPERM); 223 } 224 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 225 if (flag & MNT_NOEXEC) 226 SCARG(uap, flags) |= MNT_NOEXEC; 227 } 228 if (vfs_busy(mp, LK_NOWAIT, 0)) { 229 vput(vp); 230 return (EPERM); 231 } 232 goto update; 233 } else { 234 if (securelevel >= 2) { 235 vput(vp); 236 return (EPERM); 237 } 238 } 239 /* 240 * If the user is not root, ensure that they own the directory 241 * onto which we are attempting to mount. 242 */ 243 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 244 (va.va_uid != p->p_ucred->cr_uid && 245 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 246 vput(vp); 247 return (error); 248 } 249 /* 250 * Do not allow NFS export by non-root users. For non-root users, 251 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 252 * mount point is already MNT_NOEXEC. 253 */ 254 if (p->p_ucred->cr_uid != 0) { 255 if (SCARG(uap, flags) & MNT_EXPORTED) { 256 vput(vp); 257 return (EPERM); 258 } 259 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 260 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 261 SCARG(uap, flags) |= MNT_NOEXEC; 262 } 263 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) { 264 vput(vp); 265 return (error); 266 } 267 if (vp->v_type != VDIR) { 268 vput(vp); 269 return (ENOTDIR); 270 } 271 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 272 if (error) { 273 #if defined(COMPAT_09) || defined(COMPAT_43) 274 /* 275 * Historically filesystem types were identified by number. 276 * If we get an integer for the filesystem type instead of a 277 * string, we check to see if it matches one of the historic 278 * filesystem types. 279 */ 280 u_long fsindex = (u_long)SCARG(uap, type); 281 if (fsindex >= nmountcompatnames || 282 mountcompatnames[fsindex] == NULL) { 283 vput(vp); 284 return (ENODEV); 285 } 286 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 287 #else 288 vput(vp); 289 return (error); 290 #endif 291 } 292 #ifdef COMPAT_10 293 /* Accept `ufs' as an alias for `ffs'. */ 294 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 295 strncpy(fstypename, "ffs", MFSNAMELEN); 296 #endif 297 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 298 vput(vp); 299 return (ENODEV); 300 } 301 if (vp->v_mountedhere != NULL) { 302 vput(vp); 303 return (EBUSY); 304 } 305 306 /* 307 * Allocate and initialize the file system. 308 */ 309 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 310 M_MOUNT, M_WAITOK); 311 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 312 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 313 simple_lock_init(&mp->mnt_slock); 314 (void)vfs_busy(mp, LK_NOWAIT, 0); 315 mp->mnt_op = vfs; 316 vfs->vfs_refcount++; 317 mp->mnt_vnodecovered = vp; 318 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 319 mp->mnt_unmounter = NULL; 320 mp->mnt_leaf = mp; 321 322 /* 323 * The underlying file system may refuse the mount for 324 * various reasons. Allow the user to force it to happen. 325 */ 326 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 327 update: 328 if ((SCARG(uap, flags) & MNT_GETARGS) == 0) { 329 /* 330 * Set the mount level flags. 331 */ 332 if (SCARG(uap, flags) & MNT_RDONLY) 333 mp->mnt_flag |= MNT_RDONLY; 334 else if (mp->mnt_flag & MNT_RDONLY) 335 mp->mnt_iflag |= IMNT_WANTRDWR; 336 mp->mnt_flag &= 337 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 338 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 339 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 340 mp->mnt_flag |= SCARG(uap, flags) & 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_IGNORE); 345 } 346 /* 347 * Mount the filesystem. 348 */ 349 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 350 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 351 if (mp->mnt_iflag & IMNT_WANTRDWR) 352 mp->mnt_flag &= ~MNT_RDONLY; 353 if (error) 354 mp->mnt_flag = flag; 355 mp->mnt_flag &=~ 356 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 357 mp->mnt_iflag &=~ IMNT_WANTRDWR; 358 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 359 if (mp->mnt_syncer == NULL) 360 error = vfs_allocate_syncvnode(mp); 361 } else { 362 if (mp->mnt_syncer != NULL) 363 vfs_deallocate_syncvnode(mp); 364 } 365 vfs_unbusy(mp); 366 VOP_UNLOCK(vp, 0); 367 vrele(vp); 368 return (error); 369 } 370 /* 371 * Put the new filesystem on the mount list after root. 372 */ 373 cache_purge(vp); 374 if (!error) { 375 mp->mnt_flag &=~ 376 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 377 mp->mnt_iflag &=~ IMNT_WANTRDWR; 378 vp->v_mountedhere = mp; 379 simple_lock(&mountlist_slock); 380 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 381 simple_unlock(&mountlist_slock); 382 checkdirs(vp); 383 VOP_UNLOCK(vp, 0); 384 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 385 error = vfs_allocate_syncvnode(mp); 386 vfs_unbusy(mp); 387 (void) VFS_STATVFS(mp, &mp->mnt_stat, p); 388 if ((error = VFS_START(mp, 0, p))) 389 vrele(vp); 390 } else { 391 vp->v_mountedhere = (struct mount *)0; 392 vfs->vfs_refcount--; 393 vfs_unbusy(mp); 394 free(mp, M_MOUNT); 395 vput(vp); 396 } 397 return (error); 398 } 399 400 /* 401 * Scan all active processes to see if any of them have a current 402 * or root directory onto which the new filesystem has just been 403 * mounted. If so, replace them with the new mount point. 404 */ 405 void 406 checkdirs(olddp) 407 struct vnode *olddp; 408 { 409 struct cwdinfo *cwdi; 410 struct vnode *newdp; 411 struct proc *p; 412 413 if (olddp->v_usecount == 1) 414 return; 415 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 416 panic("mount: lost mount"); 417 proclist_lock_read(); 418 PROCLIST_FOREACH(p, &allproc) { 419 cwdi = p->p_cwdi; 420 if (!cwdi) 421 continue; 422 if (cwdi->cwdi_cdir == olddp) { 423 vrele(cwdi->cwdi_cdir); 424 VREF(newdp); 425 cwdi->cwdi_cdir = newdp; 426 } 427 if (cwdi->cwdi_rdir == olddp) { 428 vrele(cwdi->cwdi_rdir); 429 VREF(newdp); 430 cwdi->cwdi_rdir = newdp; 431 } 432 } 433 proclist_unlock_read(); 434 if (rootvnode == olddp) { 435 vrele(rootvnode); 436 VREF(newdp); 437 rootvnode = newdp; 438 } 439 vput(newdp); 440 } 441 442 /* 443 * Unmount a file system. 444 * 445 * Note: unmount takes a path to the vnode mounted on as argument, 446 * not special file (as before). 447 */ 448 /* ARGSUSED */ 449 int 450 sys_unmount(l, v, retval) 451 struct lwp *l; 452 void *v; 453 register_t *retval; 454 { 455 struct sys_unmount_args /* { 456 syscallarg(const char *) path; 457 syscallarg(int) flags; 458 } */ *uap = v; 459 struct proc *p = l->l_proc; 460 struct vnode *vp; 461 struct mount *mp; 462 int error; 463 struct nameidata nd; 464 465 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 466 SCARG(uap, path), p); 467 if ((error = namei(&nd)) != 0) 468 return (error); 469 vp = nd.ni_vp; 470 mp = vp->v_mount; 471 472 /* 473 * Only root, or the user that did the original mount is 474 * permitted to unmount this filesystem. 475 */ 476 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 477 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 478 vput(vp); 479 return (error); 480 } 481 482 /* 483 * Don't allow unmounting the root file system. 484 */ 485 if (mp->mnt_flag & MNT_ROOTFS) { 486 vput(vp); 487 return (EINVAL); 488 } 489 490 /* 491 * Must be the root of the filesystem 492 */ 493 if ((vp->v_flag & VROOT) == 0) { 494 vput(vp); 495 return (EINVAL); 496 } 497 vput(vp); 498 499 /* 500 * XXX Freeze syncer. Must do this before locking the 501 * mount point. See dounmount() for details. 502 */ 503 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 504 505 if (vfs_busy(mp, 0, 0)) { 506 lockmgr(&syncer_lock, LK_RELEASE, NULL); 507 return (EBUSY); 508 } 509 510 return (dounmount(mp, SCARG(uap, flags), p)); 511 } 512 513 /* 514 * Do the actual file system unmount. File system is assumed to have been 515 * marked busy by the caller. 516 */ 517 int 518 dounmount(mp, flags, p) 519 struct mount *mp; 520 int flags; 521 struct proc *p; 522 { 523 struct vnode *coveredvp; 524 int error; 525 int async; 526 int used_syncer; 527 528 simple_lock(&mountlist_slock); 529 vfs_unbusy(mp); 530 used_syncer = (mp->mnt_syncer != NULL); 531 532 /* 533 * XXX Syncer must be frozen when we get here. This should really 534 * be done on a per-mountpoint basis, but especially the softdep 535 * code possibly called from the syncer doens't exactly work on a 536 * per-mountpoint basis, so the softdep code would become a maze 537 * of vfs_busy() calls. 538 * 539 * The caller of dounmount() must acquire syncer_lock because 540 * the syncer itself acquires locks in syncer_lock -> vfs_busy 541 * order, and we must preserve that order to avoid deadlock. 542 * 543 * So, if the file system did not use the syncer, now is 544 * the time to release the syncer_lock. 545 */ 546 if (used_syncer == 0) 547 lockmgr(&syncer_lock, LK_RELEASE, NULL); 548 549 mp->mnt_iflag |= IMNT_UNMOUNT; 550 mp->mnt_unmounter = p; 551 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 552 vn_start_write(NULL, &mp, V_WAIT); 553 554 if (mp->mnt_flag & MNT_EXPUBLIC) 555 vfs_setpublicfs(NULL, NULL, NULL); 556 async = mp->mnt_flag & MNT_ASYNC; 557 mp->mnt_flag &= ~MNT_ASYNC; 558 cache_purgevfs(mp); /* remove cache entries for this file sys */ 559 if (mp->mnt_syncer != NULL) 560 vfs_deallocate_syncvnode(mp); 561 error = 0; 562 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 563 #if NFSS > 0 564 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 565 #endif 566 if (error == 0) 567 error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p); 568 } 569 if (error == 0 || (flags & MNT_FORCE)) 570 error = VFS_UNMOUNT(mp, flags, p); 571 vn_finished_write(mp, 0); 572 simple_lock(&mountlist_slock); 573 if (error) { 574 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 575 (void) vfs_allocate_syncvnode(mp); 576 mp->mnt_iflag &= ~IMNT_UNMOUNT; 577 mp->mnt_unmounter = NULL; 578 mp->mnt_flag |= async; 579 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 580 &mountlist_slock); 581 if (used_syncer) 582 lockmgr(&syncer_lock, LK_RELEASE, NULL); 583 simple_lock(&mp->mnt_slock); 584 while (mp->mnt_wcnt > 0) { 585 wakeup(mp); 586 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 587 0, &mp->mnt_slock); 588 } 589 simple_unlock(&mp->mnt_slock); 590 return (error); 591 } 592 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 593 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 594 coveredvp->v_mountedhere = NULL; 595 vrele(coveredvp); 596 } 597 mp->mnt_op->vfs_refcount--; 598 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 599 panic("unmount: dangling vnode"); 600 mp->mnt_iflag |= IMNT_GONE; 601 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 602 if (used_syncer) 603 lockmgr(&syncer_lock, LK_RELEASE, NULL); 604 simple_lock(&mp->mnt_slock); 605 while (mp->mnt_wcnt > 0) { 606 wakeup(mp); 607 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 608 } 609 simple_unlock(&mp->mnt_slock); 610 free(mp, M_MOUNT); 611 return (0); 612 } 613 614 /* 615 * Sync each mounted filesystem. 616 */ 617 #ifdef DEBUG 618 int syncprt = 0; 619 struct ctldebug debug0 = { "syncprt", &syncprt }; 620 #endif 621 622 /* ARGSUSED */ 623 int 624 sys_sync(l, v, retval) 625 struct lwp *l; 626 void *v; 627 register_t *retval; 628 { 629 struct mount *mp, *nmp; 630 int asyncflag; 631 struct proc *p = l == NULL ? &proc0 : l->l_proc; 632 633 simple_lock(&mountlist_slock); 634 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 635 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 636 nmp = mp->mnt_list.cqe_prev; 637 continue; 638 } 639 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 640 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 641 asyncflag = mp->mnt_flag & MNT_ASYNC; 642 mp->mnt_flag &= ~MNT_ASYNC; 643 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 644 if (asyncflag) 645 mp->mnt_flag |= MNT_ASYNC; 646 vn_finished_write(mp, 0); 647 } 648 simple_lock(&mountlist_slock); 649 nmp = mp->mnt_list.cqe_prev; 650 vfs_unbusy(mp); 651 652 } 653 simple_unlock(&mountlist_slock); 654 #ifdef DEBUG 655 if (syncprt) 656 vfs_bufstats(); 657 #endif /* DEBUG */ 658 return (0); 659 } 660 661 /* 662 * Change filesystem quotas. 663 */ 664 /* ARGSUSED */ 665 int 666 sys_quotactl(l, v, retval) 667 struct lwp *l; 668 void *v; 669 register_t *retval; 670 { 671 struct sys_quotactl_args /* { 672 syscallarg(const char *) path; 673 syscallarg(int) cmd; 674 syscallarg(int) uid; 675 syscallarg(caddr_t) arg; 676 } */ *uap = v; 677 struct proc *p = l->l_proc; 678 struct mount *mp; 679 int error; 680 struct nameidata nd; 681 682 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 683 if ((error = namei(&nd)) != 0) 684 return (error); 685 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 686 vrele(nd.ni_vp); 687 if (error) 688 return (error); 689 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 690 SCARG(uap, arg), p); 691 vn_finished_write(mp, 0); 692 return (error); 693 } 694 695 int 696 dostatvfs(struct mount *mp, struct statvfs *sp, struct proc *p, int flags, 697 int root) 698 { 699 struct cwdinfo *cwdi = p->p_cwdi; 700 int error = 0; 701 702 /* 703 * If MNT_NOWAIT or MNT_LAZY is specified, do not 704 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 705 * overrides MNT_NOWAIT. 706 */ 707 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 708 (flags != MNT_WAIT && flags != 0)) { 709 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 710 goto done; 711 } 712 713 /* Get the filesystem stats now */ 714 memset(sp, 0, sizeof(*sp)); 715 if ((error = VFS_STATVFS(mp, sp, p)) != 0) { 716 return error; 717 } 718 719 if (cwdi->cwdi_rdir == NULL) 720 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 721 done: 722 if (cwdi->cwdi_rdir != NULL) { 723 size_t len; 724 char *bp; 725 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 726 if (!path) 727 return ENOMEM; 728 729 bp = path + MAXPATHLEN; 730 *--bp = '\0'; 731 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 732 MAXPATHLEN / 2, 0, p); 733 if (error) { 734 free(path, M_TEMP); 735 return error; 736 } 737 len = strlen(bp); 738 /* 739 * for mount points that are below our root, we can see 740 * them, so we fix up the pathname and return them. The 741 * rest we cannot see, so we don't allow viewing the 742 * data. 743 */ 744 if (strncmp(bp, sp->f_mntonname, len) == 0) { 745 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 746 sizeof(sp->f_mntonname)); 747 if (sp->f_mntonname[0] == '\0') 748 (void)strlcpy(sp->f_mntonname, "/", 749 sizeof(sp->f_mntonname)); 750 } else { 751 if (root) 752 (void)strlcpy(sp->f_mntonname, "/", 753 sizeof(sp->f_mntonname)); 754 else 755 error = EPERM; 756 } 757 free(path, M_TEMP); 758 } 759 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 760 return error; 761 } 762 763 /* 764 * Get filesystem statistics. 765 */ 766 /* ARGSUSED */ 767 int 768 sys_statvfs1(l, v, retval) 769 struct lwp *l; 770 void *v; 771 register_t *retval; 772 { 773 struct sys_statvfs1_args /* { 774 syscallarg(const char *) path; 775 syscallarg(struct statvfs *) buf; 776 syscallarg(int) flags; 777 } */ *uap = v; 778 struct proc *p = l->l_proc; 779 struct mount *mp; 780 struct statvfs sbuf; 781 int error; 782 struct nameidata nd; 783 784 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 785 if ((error = namei(&nd)) != 0) 786 return error; 787 mp = nd.ni_vp->v_mount; 788 vrele(nd.ni_vp); 789 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 790 return error; 791 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 792 } 793 794 /* 795 * Get filesystem statistics. 796 */ 797 /* ARGSUSED */ 798 int 799 sys_fstatvfs1(l, v, retval) 800 struct lwp *l; 801 void *v; 802 register_t *retval; 803 { 804 struct sys_fstatvfs1_args /* { 805 syscallarg(int) fd; 806 syscallarg(struct statvfs *) buf; 807 syscallarg(int) flags; 808 } */ *uap = v; 809 struct proc *p = l->l_proc; 810 struct file *fp; 811 struct mount *mp; 812 struct statvfs sbuf; 813 int error; 814 815 /* getvnode() will use the descriptor for us */ 816 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 817 return (error); 818 mp = ((struct vnode *)fp->f_data)->v_mount; 819 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 820 goto out; 821 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 822 out: 823 FILE_UNUSE(fp, p); 824 return error; 825 } 826 827 828 /* 829 * Get statistics on all filesystems. 830 */ 831 int 832 sys_getvfsstat(l, v, retval) 833 struct lwp *l; 834 void *v; 835 register_t *retval; 836 { 837 struct sys_getvfsstat_args /* { 838 syscallarg(struct statvfs *) buf; 839 syscallarg(size_t) bufsize; 840 syscallarg(int) flags; 841 } */ *uap = v; 842 int root = 0; 843 struct proc *p = l->l_proc; 844 struct mount *mp, *nmp; 845 struct statvfs sbuf; 846 struct statvfs *sfsp; 847 size_t count, maxcount; 848 int error = 0; 849 850 maxcount = SCARG(uap, bufsize) / sizeof(struct statvfs); 851 sfsp = SCARG(uap, buf); 852 simple_lock(&mountlist_slock); 853 count = 0; 854 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 855 mp = nmp) { 856 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 857 nmp = CIRCLEQ_NEXT(mp, mnt_list); 858 continue; 859 } 860 if (sfsp && count < maxcount) { 861 error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 0); 862 if (error) { 863 simple_lock(&mountlist_slock); 864 nmp = CIRCLEQ_NEXT(mp, mnt_list); 865 vfs_unbusy(mp); 866 continue; 867 } 868 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 869 if (error) { 870 vfs_unbusy(mp); 871 return (error); 872 } 873 sfsp++; 874 root |= strcmp(sbuf.f_mntonname, "/") == 0; 875 } 876 count++; 877 simple_lock(&mountlist_slock); 878 nmp = CIRCLEQ_NEXT(mp, mnt_list); 879 vfs_unbusy(mp); 880 } 881 simple_unlock(&mountlist_slock); 882 if (root == 0 && p->p_cwdi->cwdi_rdir) { 883 /* 884 * fake a root entry 885 */ 886 if ((error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 887 SCARG(uap, flags), 1)) != 0) 888 return error; 889 if (sfsp) 890 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 891 count++; 892 } 893 if (sfsp && count > maxcount) 894 *retval = maxcount; 895 else 896 *retval = count; 897 return error; 898 } 899 900 /* 901 * Change current working directory to a given file descriptor. 902 */ 903 /* ARGSUSED */ 904 int 905 sys_fchdir(l, v, retval) 906 struct lwp *l; 907 void *v; 908 register_t *retval; 909 { 910 struct sys_fchdir_args /* { 911 syscallarg(int) fd; 912 } */ *uap = v; 913 struct proc *p = l->l_proc; 914 struct filedesc *fdp = p->p_fd; 915 struct cwdinfo *cwdi = p->p_cwdi; 916 struct vnode *vp, *tdp; 917 struct mount *mp; 918 struct file *fp; 919 int error; 920 921 /* getvnode() will use the descriptor for us */ 922 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 923 return (error); 924 vp = (struct vnode *)fp->f_data; 925 926 VREF(vp); 927 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 928 if (vp->v_type != VDIR) 929 error = ENOTDIR; 930 else 931 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 932 while (!error && (mp = vp->v_mountedhere) != NULL) { 933 if (vfs_busy(mp, 0, 0)) 934 continue; 935 error = VFS_ROOT(mp, &tdp); 936 vfs_unbusy(mp); 937 if (error) 938 break; 939 vput(vp); 940 vp = tdp; 941 } 942 if (error) { 943 vput(vp); 944 goto out; 945 } 946 VOP_UNLOCK(vp, 0); 947 948 /* 949 * Disallow changing to a directory not under the process's 950 * current root directory (if there is one). 951 */ 952 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 953 vrele(vp); 954 error = EPERM; /* operation not permitted */ 955 goto out; 956 } 957 958 vrele(cwdi->cwdi_cdir); 959 cwdi->cwdi_cdir = vp; 960 out: 961 FILE_UNUSE(fp, p); 962 return (error); 963 } 964 965 /* 966 * Change this process's notion of the root directory to a given file descriptor. 967 */ 968 969 int 970 sys_fchroot(l, v, retval) 971 struct lwp *l; 972 void *v; 973 register_t *retval; 974 { 975 struct sys_fchroot_args *uap = v; 976 struct proc *p = l->l_proc; 977 struct filedesc *fdp = p->p_fd; 978 struct cwdinfo *cwdi = p->p_cwdi; 979 struct vnode *vp; 980 struct file *fp; 981 int error; 982 983 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 984 return error; 985 /* getvnode() will use the descriptor for us */ 986 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 987 return error; 988 vp = (struct vnode *) fp->f_data; 989 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 990 if (vp->v_type != VDIR) 991 error = ENOTDIR; 992 else 993 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 994 VOP_UNLOCK(vp, 0); 995 if (error) 996 goto out; 997 VREF(vp); 998 999 /* 1000 * Prevent escaping from chroot by putting the root under 1001 * the working directory. Silently chdir to / if we aren't 1002 * already there. 1003 */ 1004 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1005 /* 1006 * XXX would be more failsafe to change directory to a 1007 * deadfs node here instead 1008 */ 1009 vrele(cwdi->cwdi_cdir); 1010 VREF(vp); 1011 cwdi->cwdi_cdir = vp; 1012 } 1013 1014 if (cwdi->cwdi_rdir != NULL) 1015 vrele(cwdi->cwdi_rdir); 1016 cwdi->cwdi_rdir = vp; 1017 out: 1018 FILE_UNUSE(fp, p); 1019 return (error); 1020 } 1021 1022 1023 1024 /* 1025 * Change current working directory (``.''). 1026 */ 1027 /* ARGSUSED */ 1028 int 1029 sys_chdir(l, v, retval) 1030 struct lwp *l; 1031 void *v; 1032 register_t *retval; 1033 { 1034 struct sys_chdir_args /* { 1035 syscallarg(const char *) path; 1036 } */ *uap = v; 1037 struct proc *p = l->l_proc; 1038 struct cwdinfo *cwdi = p->p_cwdi; 1039 int error; 1040 struct nameidata nd; 1041 1042 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1043 SCARG(uap, path), p); 1044 if ((error = change_dir(&nd, p)) != 0) 1045 return (error); 1046 vrele(cwdi->cwdi_cdir); 1047 cwdi->cwdi_cdir = nd.ni_vp; 1048 return (0); 1049 } 1050 1051 /* 1052 * Change notion of root (``/'') directory. 1053 */ 1054 /* ARGSUSED */ 1055 int 1056 sys_chroot(l, v, retval) 1057 struct lwp *l; 1058 void *v; 1059 register_t *retval; 1060 { 1061 struct sys_chroot_args /* { 1062 syscallarg(const char *) path; 1063 } */ *uap = v; 1064 struct proc *p = l->l_proc; 1065 struct cwdinfo *cwdi = p->p_cwdi; 1066 struct vnode *vp; 1067 int error; 1068 struct nameidata nd; 1069 1070 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1071 return (error); 1072 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1073 SCARG(uap, path), p); 1074 if ((error = change_dir(&nd, p)) != 0) 1075 return (error); 1076 if (cwdi->cwdi_rdir != NULL) 1077 vrele(cwdi->cwdi_rdir); 1078 vp = nd.ni_vp; 1079 cwdi->cwdi_rdir = vp; 1080 1081 /* 1082 * Prevent escaping from chroot by putting the root under 1083 * the working directory. Silently chdir to / if we aren't 1084 * already there. 1085 */ 1086 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1087 /* 1088 * XXX would be more failsafe to change directory to a 1089 * deadfs node here instead 1090 */ 1091 vrele(cwdi->cwdi_cdir); 1092 VREF(vp); 1093 cwdi->cwdi_cdir = vp; 1094 } 1095 1096 return (0); 1097 } 1098 1099 /* 1100 * Common routine for chroot and chdir. 1101 */ 1102 static int 1103 change_dir(ndp, p) 1104 struct nameidata *ndp; 1105 struct proc *p; 1106 { 1107 struct vnode *vp; 1108 int error; 1109 1110 if ((error = namei(ndp)) != 0) 1111 return (error); 1112 vp = ndp->ni_vp; 1113 if (vp->v_type != VDIR) 1114 error = ENOTDIR; 1115 else 1116 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1117 1118 if (error) 1119 vput(vp); 1120 else 1121 VOP_UNLOCK(vp, 0); 1122 return (error); 1123 } 1124 1125 /* 1126 * Check permissions, allocate an open file structure, 1127 * and call the device open routine if any. 1128 */ 1129 int 1130 sys_open(l, v, retval) 1131 struct lwp *l; 1132 void *v; 1133 register_t *retval; 1134 { 1135 struct sys_open_args /* { 1136 syscallarg(const char *) path; 1137 syscallarg(int) flags; 1138 syscallarg(int) mode; 1139 } */ *uap = v; 1140 struct proc *p = l->l_proc; 1141 struct cwdinfo *cwdi = p->p_cwdi; 1142 struct filedesc *fdp = p->p_fd; 1143 struct file *fp; 1144 struct vnode *vp; 1145 int flags, cmode; 1146 int type, indx, error; 1147 struct flock lf; 1148 struct nameidata nd; 1149 1150 flags = FFLAGS(SCARG(uap, flags)); 1151 if ((flags & (FREAD | FWRITE)) == 0) 1152 return (EINVAL); 1153 /* falloc() will use the file descriptor for us */ 1154 if ((error = falloc(p, &fp, &indx)) != 0) 1155 return (error); 1156 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1157 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1158 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1159 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1160 FILE_UNUSE(fp, p); 1161 fdp->fd_ofiles[indx] = NULL; 1162 ffree(fp); 1163 if ((error == EDUPFD || error == EMOVEFD) && 1164 l->l_dupfd >= 0 && /* XXX from fdopen */ 1165 (error = 1166 dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) { 1167 *retval = indx; 1168 return (0); 1169 } 1170 if (error == ERESTART) 1171 error = EINTR; 1172 fdremove(fdp, indx); 1173 return (error); 1174 } 1175 l->l_dupfd = 0; 1176 vp = nd.ni_vp; 1177 fp->f_flag = flags & FMASK; 1178 fp->f_type = DTYPE_VNODE; 1179 fp->f_ops = &vnops; 1180 fp->f_data = vp; 1181 if (flags & (O_EXLOCK | O_SHLOCK)) { 1182 lf.l_whence = SEEK_SET; 1183 lf.l_start = 0; 1184 lf.l_len = 0; 1185 if (flags & O_EXLOCK) 1186 lf.l_type = F_WRLCK; 1187 else 1188 lf.l_type = F_RDLCK; 1189 type = F_FLOCK; 1190 if ((flags & FNONBLOCK) == 0) 1191 type |= F_WAIT; 1192 VOP_UNLOCK(vp, 0); 1193 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1194 if (error) { 1195 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1196 FILE_UNUSE(fp, p); 1197 ffree(fp); 1198 fdremove(fdp, indx); 1199 return (error); 1200 } 1201 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1202 fp->f_flag |= FHASLOCK; 1203 } 1204 VOP_UNLOCK(vp, 0); 1205 *retval = indx; 1206 FILE_SET_MATURE(fp); 1207 FILE_UNUSE(fp, p); 1208 return (0); 1209 } 1210 1211 /* 1212 * Get file handle system call 1213 */ 1214 int 1215 sys_getfh(l, v, retval) 1216 struct lwp *l; 1217 void *v; 1218 register_t *retval; 1219 { 1220 struct sys_getfh_args /* { 1221 syscallarg(char *) fname; 1222 syscallarg(fhandle_t *) fhp; 1223 } */ *uap = v; 1224 struct proc *p = l->l_proc; 1225 struct vnode *vp; 1226 fhandle_t fh; 1227 int error; 1228 struct nameidata nd; 1229 1230 /* 1231 * Must be super user 1232 */ 1233 error = suser(p->p_ucred, &p->p_acflag); 1234 if (error) 1235 return (error); 1236 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1237 SCARG(uap, fname), p); 1238 error = namei(&nd); 1239 if (error) 1240 return (error); 1241 vp = nd.ni_vp; 1242 memset(&fh, 0, sizeof(fh)); 1243 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsidx; 1244 error = VFS_VPTOFH(vp, &fh.fh_fid); 1245 vput(vp); 1246 if (error) 1247 return (error); 1248 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1249 return (error); 1250 } 1251 1252 /* 1253 * Open a file given a file handle. 1254 * 1255 * Check permissions, allocate an open file structure, 1256 * and call the device open routine if any. 1257 */ 1258 int 1259 sys_fhopen(l, v, retval) 1260 struct lwp *l; 1261 void *v; 1262 register_t *retval; 1263 { 1264 struct sys_fhopen_args /* { 1265 syscallarg(const fhandle_t *) fhp; 1266 syscallarg(int) flags; 1267 } */ *uap = v; 1268 struct proc *p = l->l_proc; 1269 struct filedesc *fdp = p->p_fd; 1270 struct file *fp; 1271 struct vnode *vp = NULL; 1272 struct mount *mp; 1273 struct ucred *cred = p->p_ucred; 1274 int flags; 1275 struct file *nfp; 1276 int type, indx, error=0; 1277 struct flock lf; 1278 struct vattr va; 1279 fhandle_t fh; 1280 1281 /* 1282 * Must be super user 1283 */ 1284 if ((error = suser(p->p_ucred, &p->p_acflag))) 1285 return (error); 1286 1287 flags = FFLAGS(SCARG(uap, flags)); 1288 if ((flags & (FREAD | FWRITE)) == 0) 1289 return (EINVAL); 1290 if ((flags & O_CREAT)) 1291 return (EINVAL); 1292 /* falloc() will use the file descriptor for us */ 1293 if ((error = falloc(p, &nfp, &indx)) != 0) 1294 return (error); 1295 fp = nfp; 1296 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1297 goto bad; 1298 1299 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1300 error = ESTALE; 1301 goto bad; 1302 } 1303 1304 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1305 vp = NULL; /* most likely unnecessary sanity for bad: */ 1306 goto bad; 1307 } 1308 1309 /* Now do an effective vn_open */ 1310 1311 if (vp->v_type == VSOCK) { 1312 error = EOPNOTSUPP; 1313 goto bad; 1314 } 1315 if (flags & FREAD) { 1316 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1317 goto bad; 1318 } 1319 if (flags & (FWRITE | O_TRUNC)) { 1320 if (vp->v_type == VDIR) { 1321 error = EISDIR; 1322 goto bad; 1323 } 1324 if ((error = vn_writechk(vp)) != 0 || 1325 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1326 goto bad; 1327 } 1328 if (flags & O_TRUNC) { 1329 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1330 goto bad; 1331 VOP_UNLOCK(vp, 0); /* XXX */ 1332 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1333 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1334 VATTR_NULL(&va); 1335 va.va_size = 0; 1336 error = VOP_SETATTR(vp, &va, cred, p); 1337 vn_finished_write(mp, 0); 1338 if (error) 1339 goto bad; 1340 } 1341 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1342 goto bad; 1343 if (vp->v_type == VREG && 1344 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1345 error = EIO; 1346 goto bad; 1347 } 1348 if (flags & FWRITE) 1349 vp->v_writecount++; 1350 1351 /* done with modified vn_open, now finish what sys_open does. */ 1352 1353 fp->f_flag = flags & FMASK; 1354 fp->f_type = DTYPE_VNODE; 1355 fp->f_ops = &vnops; 1356 fp->f_data = vp; 1357 if (flags & (O_EXLOCK | O_SHLOCK)) { 1358 lf.l_whence = SEEK_SET; 1359 lf.l_start = 0; 1360 lf.l_len = 0; 1361 if (flags & O_EXLOCK) 1362 lf.l_type = F_WRLCK; 1363 else 1364 lf.l_type = F_RDLCK; 1365 type = F_FLOCK; 1366 if ((flags & FNONBLOCK) == 0) 1367 type |= F_WAIT; 1368 VOP_UNLOCK(vp, 0); 1369 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1370 if (error) { 1371 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1372 FILE_UNUSE(fp, p); 1373 ffree(fp); 1374 fdremove(fdp, indx); 1375 return (error); 1376 } 1377 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1378 fp->f_flag |= FHASLOCK; 1379 } 1380 VOP_UNLOCK(vp, 0); 1381 *retval = indx; 1382 FILE_SET_MATURE(fp); 1383 FILE_UNUSE(fp, p); 1384 return (0); 1385 1386 bad: 1387 FILE_UNUSE(fp, p); 1388 ffree(fp); 1389 fdremove(fdp, indx); 1390 if (vp != NULL) 1391 vput(vp); 1392 return (error); 1393 } 1394 1395 /* ARGSUSED */ 1396 int 1397 sys_fhstat(l, v, retval) 1398 struct lwp *l; 1399 void *v; 1400 register_t *retval; 1401 { 1402 struct sys_fhstat_args /* { 1403 syscallarg(const fhandle_t *) fhp; 1404 syscallarg(struct stat *) sb; 1405 } */ *uap = v; 1406 struct proc *p = l->l_proc; 1407 struct stat sb; 1408 int error; 1409 fhandle_t fh; 1410 struct mount *mp; 1411 struct vnode *vp; 1412 1413 /* 1414 * Must be super user 1415 */ 1416 if ((error = suser(p->p_ucred, &p->p_acflag))) 1417 return (error); 1418 1419 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1420 return (error); 1421 1422 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1423 return (ESTALE); 1424 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1425 return (error); 1426 error = vn_stat(vp, &sb, p); 1427 vput(vp); 1428 if (error) 1429 return (error); 1430 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1431 return (error); 1432 } 1433 1434 /* ARGSUSED */ 1435 int 1436 sys_fhstatvfs1(l, v, retval) 1437 struct lwp *l; 1438 void *v; 1439 register_t *retval; 1440 { 1441 struct sys_fhstatvfs1_args /* 1442 syscallarg(const fhandle_t *) fhp; 1443 syscallarg(struct statvfs *) buf; 1444 syscallarg(int) flags; 1445 } */ *uap = v; 1446 struct proc *p = l->l_proc; 1447 struct statvfs sbuf; 1448 fhandle_t fh; 1449 struct mount *mp; 1450 struct vnode *vp; 1451 int error; 1452 1453 /* 1454 * Must be super user 1455 */ 1456 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1457 return error; 1458 1459 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1460 return error; 1461 1462 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1463 return ESTALE; 1464 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1465 return error; 1466 1467 mp = vp->v_mount; 1468 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) { 1469 vput(vp); 1470 return error; 1471 } 1472 vput(vp); 1473 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 1474 } 1475 1476 /* 1477 * Create a special file. 1478 */ 1479 /* ARGSUSED */ 1480 int 1481 sys_mknod(l, v, retval) 1482 struct lwp *l; 1483 void *v; 1484 register_t *retval; 1485 { 1486 struct sys_mknod_args /* { 1487 syscallarg(const char *) path; 1488 syscallarg(int) mode; 1489 syscallarg(int) dev; 1490 } */ *uap = v; 1491 struct proc *p = l->l_proc; 1492 struct vnode *vp; 1493 struct mount *mp; 1494 struct vattr vattr; 1495 int error; 1496 int whiteout = 0; 1497 struct nameidata nd; 1498 1499 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1500 return (error); 1501 restart: 1502 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1503 if ((error = namei(&nd)) != 0) 1504 return (error); 1505 vp = nd.ni_vp; 1506 if (vp != NULL) 1507 error = EEXIST; 1508 else { 1509 VATTR_NULL(&vattr); 1510 vattr.va_mode = 1511 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1512 vattr.va_rdev = SCARG(uap, dev); 1513 whiteout = 0; 1514 1515 switch (SCARG(uap, mode) & S_IFMT) { 1516 case S_IFMT: /* used by badsect to flag bad sectors */ 1517 vattr.va_type = VBAD; 1518 break; 1519 case S_IFCHR: 1520 vattr.va_type = VCHR; 1521 break; 1522 case S_IFBLK: 1523 vattr.va_type = VBLK; 1524 break; 1525 case S_IFWHT: 1526 whiteout = 1; 1527 break; 1528 default: 1529 error = EINVAL; 1530 break; 1531 } 1532 } 1533 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1534 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1535 if (nd.ni_dvp == vp) 1536 vrele(nd.ni_dvp); 1537 else 1538 vput(nd.ni_dvp); 1539 if (vp) 1540 vrele(vp); 1541 if ((error = vn_start_write(NULL, &mp, 1542 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1543 return (error); 1544 goto restart; 1545 } 1546 if (!error) { 1547 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1548 if (whiteout) { 1549 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1550 if (error) 1551 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1552 vput(nd.ni_dvp); 1553 } else { 1554 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1555 &nd.ni_cnd, &vattr); 1556 if (error == 0) 1557 vput(nd.ni_vp); 1558 } 1559 } else { 1560 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1561 if (nd.ni_dvp == vp) 1562 vrele(nd.ni_dvp); 1563 else 1564 vput(nd.ni_dvp); 1565 if (vp) 1566 vrele(vp); 1567 } 1568 vn_finished_write(mp, 0); 1569 return (error); 1570 } 1571 1572 /* 1573 * Create a named pipe. 1574 */ 1575 /* ARGSUSED */ 1576 int 1577 sys_mkfifo(l, v, retval) 1578 struct lwp *l; 1579 void *v; 1580 register_t *retval; 1581 { 1582 struct sys_mkfifo_args /* { 1583 syscallarg(const char *) path; 1584 syscallarg(int) mode; 1585 } */ *uap = v; 1586 struct proc *p = l->l_proc; 1587 struct mount *mp; 1588 struct vattr vattr; 1589 int error; 1590 struct nameidata nd; 1591 1592 restart: 1593 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1594 if ((error = namei(&nd)) != 0) 1595 return (error); 1596 if (nd.ni_vp != NULL) { 1597 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1598 if (nd.ni_dvp == nd.ni_vp) 1599 vrele(nd.ni_dvp); 1600 else 1601 vput(nd.ni_dvp); 1602 vrele(nd.ni_vp); 1603 return (EEXIST); 1604 } 1605 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1606 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1607 if (nd.ni_dvp == nd.ni_vp) 1608 vrele(nd.ni_dvp); 1609 else 1610 vput(nd.ni_dvp); 1611 if (nd.ni_vp) 1612 vrele(nd.ni_vp); 1613 if ((error = vn_start_write(NULL, &mp, 1614 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1615 return (error); 1616 goto restart; 1617 } 1618 VATTR_NULL(&vattr); 1619 vattr.va_type = VFIFO; 1620 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1621 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1622 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1623 if (error == 0) 1624 vput(nd.ni_vp); 1625 vn_finished_write(mp, 0); 1626 return (error); 1627 } 1628 1629 /* 1630 * Make a hard file link. 1631 */ 1632 /* ARGSUSED */ 1633 int 1634 sys_link(l, v, retval) 1635 struct lwp *l; 1636 void *v; 1637 register_t *retval; 1638 { 1639 struct sys_link_args /* { 1640 syscallarg(const char *) path; 1641 syscallarg(const char *) link; 1642 } */ *uap = v; 1643 struct proc *p = l->l_proc; 1644 struct vnode *vp; 1645 struct mount *mp; 1646 struct nameidata nd; 1647 int error; 1648 1649 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1650 if ((error = namei(&nd)) != 0) 1651 return (error); 1652 vp = nd.ni_vp; 1653 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1654 vrele(vp); 1655 return (error); 1656 } 1657 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1658 if ((error = namei(&nd)) != 0) 1659 goto out; 1660 if (nd.ni_vp) { 1661 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1662 if (nd.ni_dvp == nd.ni_vp) 1663 vrele(nd.ni_dvp); 1664 else 1665 vput(nd.ni_dvp); 1666 vrele(nd.ni_vp); 1667 error = EEXIST; 1668 goto out; 1669 } 1670 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1671 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1672 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1673 out: 1674 vrele(vp); 1675 vn_finished_write(mp, 0); 1676 return (error); 1677 } 1678 1679 /* 1680 * Make a symbolic link. 1681 */ 1682 /* ARGSUSED */ 1683 int 1684 sys_symlink(l, v, retval) 1685 struct lwp *l; 1686 void *v; 1687 register_t *retval; 1688 { 1689 struct sys_symlink_args /* { 1690 syscallarg(const char *) path; 1691 syscallarg(const char *) link; 1692 } */ *uap = v; 1693 struct proc *p = l->l_proc; 1694 struct mount *mp; 1695 struct vattr vattr; 1696 char *path; 1697 int error; 1698 struct nameidata nd; 1699 1700 path = PNBUF_GET(); 1701 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1702 if (error) 1703 goto out; 1704 restart: 1705 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1706 if ((error = namei(&nd)) != 0) 1707 goto out; 1708 if (nd.ni_vp) { 1709 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1710 if (nd.ni_dvp == nd.ni_vp) 1711 vrele(nd.ni_dvp); 1712 else 1713 vput(nd.ni_dvp); 1714 vrele(nd.ni_vp); 1715 error = EEXIST; 1716 goto out; 1717 } 1718 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1719 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1720 if (nd.ni_dvp == nd.ni_vp) 1721 vrele(nd.ni_dvp); 1722 else 1723 vput(nd.ni_dvp); 1724 if ((error = vn_start_write(NULL, &mp, 1725 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1726 return (error); 1727 goto restart; 1728 } 1729 VATTR_NULL(&vattr); 1730 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1731 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1732 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1733 if (error == 0) 1734 vput(nd.ni_vp); 1735 vn_finished_write(mp, 0); 1736 out: 1737 PNBUF_PUT(path); 1738 return (error); 1739 } 1740 1741 /* 1742 * Delete a whiteout from the filesystem. 1743 */ 1744 /* ARGSUSED */ 1745 int 1746 sys_undelete(l, v, retval) 1747 struct lwp *l; 1748 void *v; 1749 register_t *retval; 1750 { 1751 struct sys_undelete_args /* { 1752 syscallarg(const char *) path; 1753 } */ *uap = v; 1754 struct proc *p = l->l_proc; 1755 int error; 1756 struct mount *mp; 1757 struct nameidata nd; 1758 1759 restart: 1760 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1761 SCARG(uap, path), p); 1762 error = namei(&nd); 1763 if (error) 1764 return (error); 1765 1766 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1767 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1768 if (nd.ni_dvp == nd.ni_vp) 1769 vrele(nd.ni_dvp); 1770 else 1771 vput(nd.ni_dvp); 1772 if (nd.ni_vp) 1773 vrele(nd.ni_vp); 1774 return (EEXIST); 1775 } 1776 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1777 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1778 if (nd.ni_dvp == nd.ni_vp) 1779 vrele(nd.ni_dvp); 1780 else 1781 vput(nd.ni_dvp); 1782 if ((error = vn_start_write(NULL, &mp, 1783 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1784 return (error); 1785 goto restart; 1786 } 1787 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1788 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1789 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1790 vput(nd.ni_dvp); 1791 vn_finished_write(mp, 0); 1792 return (error); 1793 } 1794 1795 /* 1796 * Delete a name from the filesystem. 1797 */ 1798 /* ARGSUSED */ 1799 int 1800 sys_unlink(l, v, retval) 1801 struct lwp *l; 1802 void *v; 1803 register_t *retval; 1804 { 1805 struct sys_unlink_args /* { 1806 syscallarg(const char *) path; 1807 } */ *uap = v; 1808 struct proc *p = l->l_proc; 1809 struct mount *mp; 1810 struct vnode *vp; 1811 int error; 1812 struct nameidata nd; 1813 1814 restart: 1815 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1816 SCARG(uap, path), p); 1817 if ((error = namei(&nd)) != 0) 1818 return (error); 1819 vp = nd.ni_vp; 1820 1821 /* 1822 * The root of a mounted filesystem cannot be deleted. 1823 */ 1824 if (vp->v_flag & VROOT) { 1825 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1826 if (nd.ni_dvp == vp) 1827 vrele(nd.ni_dvp); 1828 else 1829 vput(nd.ni_dvp); 1830 vput(vp); 1831 error = EBUSY; 1832 goto out; 1833 } 1834 1835 #ifdef VERIFIED_EXEC 1836 /* Handle remove requests for veriexec entries. */ 1837 if ((error = veriexec_removechk(p, vp, nd.ni_dirp)) != 0) { 1838 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1839 if (nd.ni_dvp == vp) 1840 vrele(nd.ni_dvp); 1841 else 1842 vput(nd.ni_dvp); 1843 vput(vp); 1844 goto out; 1845 } 1846 #endif /* VERIFIED_EXEC */ 1847 1848 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1849 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1850 if (nd.ni_dvp == vp) 1851 vrele(nd.ni_dvp); 1852 else 1853 vput(nd.ni_dvp); 1854 vput(vp); 1855 if ((error = vn_start_write(NULL, &mp, 1856 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1857 return (error); 1858 goto restart; 1859 } 1860 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1861 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1862 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1863 vn_finished_write(mp, 0); 1864 out: 1865 return (error); 1866 } 1867 1868 /* 1869 * Reposition read/write file offset. 1870 */ 1871 int 1872 sys_lseek(l, v, retval) 1873 struct lwp *l; 1874 void *v; 1875 register_t *retval; 1876 { 1877 struct sys_lseek_args /* { 1878 syscallarg(int) fd; 1879 syscallarg(int) pad; 1880 syscallarg(off_t) offset; 1881 syscallarg(int) whence; 1882 } */ *uap = v; 1883 struct proc *p = l->l_proc; 1884 struct ucred *cred = p->p_ucred; 1885 struct filedesc *fdp = p->p_fd; 1886 struct file *fp; 1887 struct vnode *vp; 1888 struct vattr vattr; 1889 off_t newoff; 1890 int error; 1891 1892 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1893 return (EBADF); 1894 1895 FILE_USE(fp); 1896 1897 vp = (struct vnode *)fp->f_data; 1898 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1899 error = ESPIPE; 1900 goto out; 1901 } 1902 1903 switch (SCARG(uap, whence)) { 1904 case SEEK_CUR: 1905 newoff = fp->f_offset + SCARG(uap, offset); 1906 break; 1907 case SEEK_END: 1908 error = VOP_GETATTR(vp, &vattr, cred, p); 1909 if (error) 1910 goto out; 1911 newoff = SCARG(uap, offset) + vattr.va_size; 1912 break; 1913 case SEEK_SET: 1914 newoff = SCARG(uap, offset); 1915 break; 1916 default: 1917 error = EINVAL; 1918 goto out; 1919 } 1920 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1921 goto out; 1922 1923 *(off_t *)retval = fp->f_offset = newoff; 1924 out: 1925 FILE_UNUSE(fp, p); 1926 return (error); 1927 } 1928 1929 /* 1930 * Positional read system call. 1931 */ 1932 int 1933 sys_pread(l, v, retval) 1934 struct lwp *l; 1935 void *v; 1936 register_t *retval; 1937 { 1938 struct sys_pread_args /* { 1939 syscallarg(int) fd; 1940 syscallarg(void *) buf; 1941 syscallarg(size_t) nbyte; 1942 syscallarg(off_t) offset; 1943 } */ *uap = v; 1944 struct proc *p = l->l_proc; 1945 struct filedesc *fdp = p->p_fd; 1946 struct file *fp; 1947 struct vnode *vp; 1948 off_t offset; 1949 int error, fd = SCARG(uap, fd); 1950 1951 if ((fp = fd_getfile(fdp, fd)) == NULL) 1952 return (EBADF); 1953 1954 if ((fp->f_flag & FREAD) == 0) { 1955 simple_unlock(&fp->f_slock); 1956 return (EBADF); 1957 } 1958 1959 FILE_USE(fp); 1960 1961 vp = (struct vnode *)fp->f_data; 1962 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1963 error = ESPIPE; 1964 goto out; 1965 } 1966 1967 offset = SCARG(uap, offset); 1968 1969 /* 1970 * XXX This works because no file systems actually 1971 * XXX take any action on the seek operation. 1972 */ 1973 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1974 goto out; 1975 1976 /* dofileread() will unuse the descriptor for us */ 1977 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1978 &offset, 0, retval)); 1979 1980 out: 1981 FILE_UNUSE(fp, p); 1982 return (error); 1983 } 1984 1985 /* 1986 * Positional scatter read system call. 1987 */ 1988 int 1989 sys_preadv(l, v, retval) 1990 struct lwp *l; 1991 void *v; 1992 register_t *retval; 1993 { 1994 struct sys_preadv_args /* { 1995 syscallarg(int) fd; 1996 syscallarg(const struct iovec *) iovp; 1997 syscallarg(int) iovcnt; 1998 syscallarg(off_t) offset; 1999 } */ *uap = v; 2000 struct proc *p = l->l_proc; 2001 struct filedesc *fdp = p->p_fd; 2002 struct file *fp; 2003 struct vnode *vp; 2004 off_t offset; 2005 int error, fd = SCARG(uap, fd); 2006 2007 if ((fp = fd_getfile(fdp, fd)) == NULL) 2008 return (EBADF); 2009 2010 if ((fp->f_flag & FREAD) == 0) { 2011 simple_unlock(&fp->f_slock); 2012 return (EBADF); 2013 } 2014 2015 FILE_USE(fp); 2016 2017 vp = (struct vnode *)fp->f_data; 2018 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2019 error = ESPIPE; 2020 goto out; 2021 } 2022 2023 offset = SCARG(uap, offset); 2024 2025 /* 2026 * XXX This works because no file systems actually 2027 * XXX take any action on the seek operation. 2028 */ 2029 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2030 goto out; 2031 2032 /* dofilereadv() will unuse the descriptor for us */ 2033 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2034 &offset, 0, retval)); 2035 2036 out: 2037 FILE_UNUSE(fp, p); 2038 return (error); 2039 } 2040 2041 /* 2042 * Positional write system call. 2043 */ 2044 int 2045 sys_pwrite(l, v, retval) 2046 struct lwp *l; 2047 void *v; 2048 register_t *retval; 2049 { 2050 struct sys_pwrite_args /* { 2051 syscallarg(int) fd; 2052 syscallarg(const void *) buf; 2053 syscallarg(size_t) nbyte; 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 /* dofilewrite() will unuse the descriptor for us */ 2089 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2090 &offset, 0, retval)); 2091 2092 out: 2093 FILE_UNUSE(fp, p); 2094 return (error); 2095 } 2096 2097 /* 2098 * Positional gather write system call. 2099 */ 2100 int 2101 sys_pwritev(l, v, retval) 2102 struct lwp *l; 2103 void *v; 2104 register_t *retval; 2105 { 2106 struct sys_pwritev_args /* { 2107 syscallarg(int) fd; 2108 syscallarg(const struct iovec *) iovp; 2109 syscallarg(int) iovcnt; 2110 syscallarg(off_t) offset; 2111 } */ *uap = v; 2112 struct proc *p = l->l_proc; 2113 struct filedesc *fdp = p->p_fd; 2114 struct file *fp; 2115 struct vnode *vp; 2116 off_t offset; 2117 int error, fd = SCARG(uap, fd); 2118 2119 if ((fp = fd_getfile(fdp, fd)) == NULL) 2120 return (EBADF); 2121 2122 if ((fp->f_flag & FWRITE) == 0) { 2123 simple_unlock(&fp->f_slock); 2124 return (EBADF); 2125 } 2126 2127 FILE_USE(fp); 2128 2129 vp = (struct vnode *)fp->f_data; 2130 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2131 error = ESPIPE; 2132 goto out; 2133 } 2134 2135 offset = SCARG(uap, offset); 2136 2137 /* 2138 * XXX This works because no file systems actually 2139 * XXX take any action on the seek operation. 2140 */ 2141 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2142 goto out; 2143 2144 /* dofilewritev() will unuse the descriptor for us */ 2145 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2146 &offset, 0, retval)); 2147 2148 out: 2149 FILE_UNUSE(fp, p); 2150 return (error); 2151 } 2152 2153 /* 2154 * Check access permissions. 2155 */ 2156 int 2157 sys_access(l, v, retval) 2158 struct lwp *l; 2159 void *v; 2160 register_t *retval; 2161 { 2162 struct sys_access_args /* { 2163 syscallarg(const char *) path; 2164 syscallarg(int) flags; 2165 } */ *uap = v; 2166 struct proc *p = l->l_proc; 2167 struct ucred *cred; 2168 struct vnode *vp; 2169 int error, flags; 2170 struct nameidata nd; 2171 2172 cred = crdup(p->p_ucred); 2173 cred->cr_uid = p->p_cred->p_ruid; 2174 cred->cr_gid = p->p_cred->p_rgid; 2175 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2176 SCARG(uap, path), p); 2177 /* Override default credentials */ 2178 nd.ni_cnd.cn_cred = cred; 2179 if ((error = namei(&nd)) != 0) 2180 goto out; 2181 vp = nd.ni_vp; 2182 2183 /* Flags == 0 means only check for existence. */ 2184 if (SCARG(uap, flags)) { 2185 flags = 0; 2186 if (SCARG(uap, flags) & R_OK) 2187 flags |= VREAD; 2188 if (SCARG(uap, flags) & W_OK) 2189 flags |= VWRITE; 2190 if (SCARG(uap, flags) & X_OK) 2191 flags |= VEXEC; 2192 2193 error = VOP_ACCESS(vp, flags, cred, p); 2194 if (!error && (flags & VWRITE)) 2195 error = vn_writechk(vp); 2196 } 2197 vput(vp); 2198 out: 2199 crfree(cred); 2200 return (error); 2201 } 2202 2203 /* 2204 * Get file status; this version follows links. 2205 */ 2206 /* ARGSUSED */ 2207 int 2208 sys___stat13(l, v, retval) 2209 struct lwp *l; 2210 void *v; 2211 register_t *retval; 2212 { 2213 struct sys___stat13_args /* { 2214 syscallarg(const char *) path; 2215 syscallarg(struct stat *) ub; 2216 } */ *uap = v; 2217 struct proc *p = l->l_proc; 2218 struct stat sb; 2219 int error; 2220 struct nameidata nd; 2221 2222 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2223 SCARG(uap, path), p); 2224 if ((error = namei(&nd)) != 0) 2225 return (error); 2226 error = vn_stat(nd.ni_vp, &sb, p); 2227 vput(nd.ni_vp); 2228 if (error) 2229 return (error); 2230 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2231 return (error); 2232 } 2233 2234 /* 2235 * Get file status; this version does not follow links. 2236 */ 2237 /* ARGSUSED */ 2238 int 2239 sys___lstat13(l, v, retval) 2240 struct lwp *l; 2241 void *v; 2242 register_t *retval; 2243 { 2244 struct sys___lstat13_args /* { 2245 syscallarg(const char *) path; 2246 syscallarg(struct stat *) ub; 2247 } */ *uap = v; 2248 struct proc *p = l->l_proc; 2249 struct stat sb; 2250 int error; 2251 struct nameidata nd; 2252 2253 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2254 SCARG(uap, path), p); 2255 if ((error = namei(&nd)) != 0) 2256 return (error); 2257 error = vn_stat(nd.ni_vp, &sb, p); 2258 vput(nd.ni_vp); 2259 if (error) 2260 return (error); 2261 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2262 return (error); 2263 } 2264 2265 /* 2266 * Get configurable pathname variables. 2267 */ 2268 /* ARGSUSED */ 2269 int 2270 sys_pathconf(l, v, retval) 2271 struct lwp *l; 2272 void *v; 2273 register_t *retval; 2274 { 2275 struct sys_pathconf_args /* { 2276 syscallarg(const char *) path; 2277 syscallarg(int) name; 2278 } */ *uap = v; 2279 struct proc *p = l->l_proc; 2280 int error; 2281 struct nameidata nd; 2282 2283 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2284 SCARG(uap, path), p); 2285 if ((error = namei(&nd)) != 0) 2286 return (error); 2287 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2288 vput(nd.ni_vp); 2289 return (error); 2290 } 2291 2292 /* 2293 * Return target name of a symbolic link. 2294 */ 2295 /* ARGSUSED */ 2296 int 2297 sys_readlink(l, v, retval) 2298 struct lwp *l; 2299 void *v; 2300 register_t *retval; 2301 { 2302 struct sys_readlink_args /* { 2303 syscallarg(const char *) path; 2304 syscallarg(char *) buf; 2305 syscallarg(size_t) count; 2306 } */ *uap = v; 2307 struct proc *p = l->l_proc; 2308 struct vnode *vp; 2309 struct iovec aiov; 2310 struct uio auio; 2311 int error; 2312 struct nameidata nd; 2313 2314 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2315 SCARG(uap, path), p); 2316 if ((error = namei(&nd)) != 0) 2317 return (error); 2318 vp = nd.ni_vp; 2319 if (vp->v_type != VLNK) 2320 error = EINVAL; 2321 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2322 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2323 aiov.iov_base = SCARG(uap, buf); 2324 aiov.iov_len = SCARG(uap, count); 2325 auio.uio_iov = &aiov; 2326 auio.uio_iovcnt = 1; 2327 auio.uio_offset = 0; 2328 auio.uio_rw = UIO_READ; 2329 auio.uio_segflg = UIO_USERSPACE; 2330 auio.uio_procp = p; 2331 auio.uio_resid = SCARG(uap, count); 2332 error = VOP_READLINK(vp, &auio, p->p_ucred); 2333 } 2334 vput(vp); 2335 *retval = SCARG(uap, count) - auio.uio_resid; 2336 return (error); 2337 } 2338 2339 /* 2340 * Change flags of a file given a path name. 2341 */ 2342 /* ARGSUSED */ 2343 int 2344 sys_chflags(l, v, retval) 2345 struct lwp *l; 2346 void *v; 2347 register_t *retval; 2348 { 2349 struct sys_chflags_args /* { 2350 syscallarg(const char *) path; 2351 syscallarg(u_long) flags; 2352 } */ *uap = v; 2353 struct proc *p = l->l_proc; 2354 struct vnode *vp; 2355 int error; 2356 struct nameidata nd; 2357 2358 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2359 if ((error = namei(&nd)) != 0) 2360 return (error); 2361 vp = nd.ni_vp; 2362 error = change_flags(vp, SCARG(uap, flags), p); 2363 vput(vp); 2364 return (error); 2365 } 2366 2367 /* 2368 * Change flags of a file given a file descriptor. 2369 */ 2370 /* ARGSUSED */ 2371 int 2372 sys_fchflags(l, v, retval) 2373 struct lwp *l; 2374 void *v; 2375 register_t *retval; 2376 { 2377 struct sys_fchflags_args /* { 2378 syscallarg(int) fd; 2379 syscallarg(u_long) flags; 2380 } */ *uap = v; 2381 struct proc *p = l->l_proc; 2382 struct vnode *vp; 2383 struct file *fp; 2384 int error; 2385 2386 /* getvnode() will use the descriptor for us */ 2387 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2388 return (error); 2389 vp = (struct vnode *)fp->f_data; 2390 error = change_flags(vp, SCARG(uap, flags), p); 2391 VOP_UNLOCK(vp, 0); 2392 FILE_UNUSE(fp, p); 2393 return (error); 2394 } 2395 2396 /* 2397 * Change flags of a file given a path name; this version does 2398 * not follow links. 2399 */ 2400 int 2401 sys_lchflags(l, v, retval) 2402 struct lwp *l; 2403 void *v; 2404 register_t *retval; 2405 { 2406 struct sys_lchflags_args /* { 2407 syscallarg(const char *) path; 2408 syscallarg(u_long) flags; 2409 } */ *uap = v; 2410 struct proc *p = l->l_proc; 2411 struct vnode *vp; 2412 int error; 2413 struct nameidata nd; 2414 2415 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2416 if ((error = namei(&nd)) != 0) 2417 return (error); 2418 vp = nd.ni_vp; 2419 error = change_flags(vp, SCARG(uap, flags), p); 2420 vput(vp); 2421 return (error); 2422 } 2423 2424 /* 2425 * Common routine to change flags of a file. 2426 */ 2427 int 2428 change_flags(vp, flags, p) 2429 struct vnode *vp; 2430 u_long flags; 2431 struct proc *p; 2432 { 2433 struct mount *mp; 2434 struct vattr vattr; 2435 int error; 2436 2437 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2438 return (error); 2439 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2440 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2441 /* 2442 * Non-superusers cannot change the flags on devices, even if they 2443 * own them. 2444 */ 2445 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2446 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2447 goto out; 2448 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2449 error = EINVAL; 2450 goto out; 2451 } 2452 } 2453 VATTR_NULL(&vattr); 2454 vattr.va_flags = flags; 2455 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2456 out: 2457 vn_finished_write(mp, 0); 2458 return (error); 2459 } 2460 2461 /* 2462 * Change mode of a file given path name; this version follows links. 2463 */ 2464 /* ARGSUSED */ 2465 int 2466 sys_chmod(l, v, retval) 2467 struct lwp *l; 2468 void *v; 2469 register_t *retval; 2470 { 2471 struct sys_chmod_args /* { 2472 syscallarg(const char *) path; 2473 syscallarg(int) mode; 2474 } */ *uap = v; 2475 struct proc *p = l->l_proc; 2476 int error; 2477 struct nameidata nd; 2478 2479 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2480 if ((error = namei(&nd)) != 0) 2481 return (error); 2482 2483 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2484 2485 vrele(nd.ni_vp); 2486 return (error); 2487 } 2488 2489 /* 2490 * Change mode of a file given a file descriptor. 2491 */ 2492 /* ARGSUSED */ 2493 int 2494 sys_fchmod(l, v, retval) 2495 struct lwp *l; 2496 void *v; 2497 register_t *retval; 2498 { 2499 struct sys_fchmod_args /* { 2500 syscallarg(int) fd; 2501 syscallarg(int) mode; 2502 } */ *uap = v; 2503 struct proc *p = l->l_proc; 2504 struct file *fp; 2505 int error; 2506 2507 /* getvnode() will use the descriptor for us */ 2508 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2509 return (error); 2510 2511 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2512 FILE_UNUSE(fp, p); 2513 return (error); 2514 } 2515 2516 /* 2517 * Change mode of a file given path name; this version does not follow links. 2518 */ 2519 /* ARGSUSED */ 2520 int 2521 sys_lchmod(l, v, retval) 2522 struct lwp *l; 2523 void *v; 2524 register_t *retval; 2525 { 2526 struct sys_lchmod_args /* { 2527 syscallarg(const char *) path; 2528 syscallarg(int) mode; 2529 } */ *uap = v; 2530 struct proc *p = l->l_proc; 2531 int error; 2532 struct nameidata nd; 2533 2534 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2535 if ((error = namei(&nd)) != 0) 2536 return (error); 2537 2538 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2539 2540 vrele(nd.ni_vp); 2541 return (error); 2542 } 2543 2544 /* 2545 * Common routine to set mode given a vnode. 2546 */ 2547 static int 2548 change_mode(vp, mode, p) 2549 struct vnode *vp; 2550 int mode; 2551 struct proc *p; 2552 { 2553 struct mount *mp; 2554 struct vattr vattr; 2555 int error; 2556 2557 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2558 return (error); 2559 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2560 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2561 VATTR_NULL(&vattr); 2562 vattr.va_mode = mode & ALLPERMS; 2563 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2564 VOP_UNLOCK(vp, 0); 2565 vn_finished_write(mp, 0); 2566 return (error); 2567 } 2568 2569 /* 2570 * Set ownership given a path name; this version follows links. 2571 */ 2572 /* ARGSUSED */ 2573 int 2574 sys_chown(l, v, retval) 2575 struct lwp *l; 2576 void *v; 2577 register_t *retval; 2578 { 2579 struct sys_chown_args /* { 2580 syscallarg(const char *) path; 2581 syscallarg(uid_t) uid; 2582 syscallarg(gid_t) gid; 2583 } */ *uap = v; 2584 struct proc *p = l->l_proc; 2585 int error; 2586 struct nameidata nd; 2587 2588 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2589 if ((error = namei(&nd)) != 0) 2590 return (error); 2591 2592 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2593 2594 vrele(nd.ni_vp); 2595 return (error); 2596 } 2597 2598 /* 2599 * Set ownership given a path name; this version follows links. 2600 * Provides POSIX semantics. 2601 */ 2602 /* ARGSUSED */ 2603 int 2604 sys___posix_chown(l, v, retval) 2605 struct lwp *l; 2606 void *v; 2607 register_t *retval; 2608 { 2609 struct sys_chown_args /* { 2610 syscallarg(const char *) path; 2611 syscallarg(uid_t) uid; 2612 syscallarg(gid_t) gid; 2613 } */ *uap = v; 2614 struct proc *p = l->l_proc; 2615 int error; 2616 struct nameidata nd; 2617 2618 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2619 if ((error = namei(&nd)) != 0) 2620 return (error); 2621 2622 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2623 2624 vrele(nd.ni_vp); 2625 return (error); 2626 } 2627 2628 /* 2629 * Set ownership given a file descriptor. 2630 */ 2631 /* ARGSUSED */ 2632 int 2633 sys_fchown(l, v, retval) 2634 struct lwp *l; 2635 void *v; 2636 register_t *retval; 2637 { 2638 struct sys_fchown_args /* { 2639 syscallarg(int) fd; 2640 syscallarg(uid_t) uid; 2641 syscallarg(gid_t) gid; 2642 } */ *uap = v; 2643 struct proc *p = l->l_proc; 2644 int error; 2645 struct file *fp; 2646 2647 /* getvnode() will use the descriptor for us */ 2648 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2649 return (error); 2650 2651 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2652 SCARG(uap, gid), p, 0); 2653 FILE_UNUSE(fp, p); 2654 return (error); 2655 } 2656 2657 /* 2658 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2659 */ 2660 /* ARGSUSED */ 2661 int 2662 sys___posix_fchown(l, v, retval) 2663 struct lwp *l; 2664 void *v; 2665 register_t *retval; 2666 { 2667 struct sys_fchown_args /* { 2668 syscallarg(int) fd; 2669 syscallarg(uid_t) uid; 2670 syscallarg(gid_t) gid; 2671 } */ *uap = v; 2672 struct proc *p = l->l_proc; 2673 int error; 2674 struct file *fp; 2675 2676 /* getvnode() will use the descriptor for us */ 2677 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2678 return (error); 2679 2680 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2681 SCARG(uap, gid), p, 1); 2682 FILE_UNUSE(fp, p); 2683 return (error); 2684 } 2685 2686 /* 2687 * Set ownership given a path name; this version does not follow links. 2688 */ 2689 /* ARGSUSED */ 2690 int 2691 sys_lchown(l, v, retval) 2692 struct lwp *l; 2693 void *v; 2694 register_t *retval; 2695 { 2696 struct sys_lchown_args /* { 2697 syscallarg(const char *) path; 2698 syscallarg(uid_t) uid; 2699 syscallarg(gid_t) gid; 2700 } */ *uap = v; 2701 struct proc *p = l->l_proc; 2702 int error; 2703 struct nameidata nd; 2704 2705 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2706 if ((error = namei(&nd)) != 0) 2707 return (error); 2708 2709 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2710 2711 vrele(nd.ni_vp); 2712 return (error); 2713 } 2714 2715 /* 2716 * Set ownership given a path name; this version does not follow links. 2717 * Provides POSIX/XPG semantics. 2718 */ 2719 /* ARGSUSED */ 2720 int 2721 sys___posix_lchown(l, v, retval) 2722 struct lwp *l; 2723 void *v; 2724 register_t *retval; 2725 { 2726 struct sys_lchown_args /* { 2727 syscallarg(const char *) path; 2728 syscallarg(uid_t) uid; 2729 syscallarg(gid_t) gid; 2730 } */ *uap = v; 2731 struct proc *p = l->l_proc; 2732 int error; 2733 struct nameidata nd; 2734 2735 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2736 if ((error = namei(&nd)) != 0) 2737 return (error); 2738 2739 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2740 2741 vrele(nd.ni_vp); 2742 return (error); 2743 } 2744 2745 /* 2746 * Common routine to set ownership given a vnode. 2747 */ 2748 static int 2749 change_owner(vp, uid, gid, p, posix_semantics) 2750 struct vnode *vp; 2751 uid_t uid; 2752 gid_t gid; 2753 struct proc *p; 2754 int posix_semantics; 2755 { 2756 struct mount *mp; 2757 struct vattr vattr; 2758 mode_t newmode; 2759 int error; 2760 2761 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2762 return (error); 2763 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2764 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2765 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2766 goto out; 2767 2768 #define CHANGED(x) ((int)(x) != -1) 2769 newmode = vattr.va_mode; 2770 if (posix_semantics) { 2771 /* 2772 * POSIX/XPG semantics: if the caller is not the super-user, 2773 * clear set-user-id and set-group-id bits. Both POSIX and 2774 * the XPG consider the behaviour for calls by the super-user 2775 * implementation-defined; we leave the set-user-id and set- 2776 * group-id settings intact in that case. 2777 */ 2778 if (suser(p->p_ucred, NULL) != 0) 2779 newmode &= ~(S_ISUID | S_ISGID); 2780 } else { 2781 /* 2782 * NetBSD semantics: when changing owner and/or group, 2783 * clear the respective bit(s). 2784 */ 2785 if (CHANGED(uid)) 2786 newmode &= ~S_ISUID; 2787 if (CHANGED(gid)) 2788 newmode &= ~S_ISGID; 2789 } 2790 /* Update va_mode iff altered. */ 2791 if (vattr.va_mode == newmode) 2792 newmode = VNOVAL; 2793 2794 VATTR_NULL(&vattr); 2795 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2796 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2797 vattr.va_mode = newmode; 2798 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2799 #undef CHANGED 2800 2801 out: 2802 VOP_UNLOCK(vp, 0); 2803 vn_finished_write(mp, 0); 2804 return (error); 2805 } 2806 2807 /* 2808 * Set the access and modification times given a path name; this 2809 * version follows links. 2810 */ 2811 /* ARGSUSED */ 2812 int 2813 sys_utimes(l, v, retval) 2814 struct lwp *l; 2815 void *v; 2816 register_t *retval; 2817 { 2818 struct sys_utimes_args /* { 2819 syscallarg(const char *) path; 2820 syscallarg(const struct timeval *) tptr; 2821 } */ *uap = v; 2822 struct proc *p = l->l_proc; 2823 int error; 2824 struct nameidata nd; 2825 2826 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2827 if ((error = namei(&nd)) != 0) 2828 return (error); 2829 2830 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2831 2832 vrele(nd.ni_vp); 2833 return (error); 2834 } 2835 2836 /* 2837 * Set the access and modification times given a file descriptor. 2838 */ 2839 /* ARGSUSED */ 2840 int 2841 sys_futimes(l, v, retval) 2842 struct lwp *l; 2843 void *v; 2844 register_t *retval; 2845 { 2846 struct sys_futimes_args /* { 2847 syscallarg(int) fd; 2848 syscallarg(const struct timeval *) tptr; 2849 } */ *uap = v; 2850 struct proc *p = l->l_proc; 2851 int error; 2852 struct file *fp; 2853 2854 /* getvnode() will use the descriptor for us */ 2855 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2856 return (error); 2857 2858 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2859 FILE_UNUSE(fp, p); 2860 return (error); 2861 } 2862 2863 /* 2864 * Set the access and modification times given a path name; this 2865 * version does not follow links. 2866 */ 2867 /* ARGSUSED */ 2868 int 2869 sys_lutimes(l, v, retval) 2870 struct lwp *l; 2871 void *v; 2872 register_t *retval; 2873 { 2874 struct sys_lutimes_args /* { 2875 syscallarg(const char *) path; 2876 syscallarg(const struct timeval *) tptr; 2877 } */ *uap = v; 2878 struct proc *p = l->l_proc; 2879 int error; 2880 struct nameidata nd; 2881 2882 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2883 if ((error = namei(&nd)) != 0) 2884 return (error); 2885 2886 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2887 2888 vrele(nd.ni_vp); 2889 return (error); 2890 } 2891 2892 /* 2893 * Common routine to set access and modification times given a vnode. 2894 */ 2895 static int 2896 change_utimes(vp, tptr, p) 2897 struct vnode *vp; 2898 const struct timeval *tptr; 2899 struct proc *p; 2900 { 2901 struct timeval tv[2]; 2902 struct mount *mp; 2903 struct vattr vattr; 2904 int error; 2905 2906 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2907 return (error); 2908 VATTR_NULL(&vattr); 2909 if (tptr == NULL) { 2910 microtime(&tv[0]); 2911 tv[1] = tv[0]; 2912 vattr.va_vaflags |= VA_UTIMES_NULL; 2913 } else { 2914 error = copyin(tptr, tv, sizeof(tv)); 2915 if (error) 2916 goto out; 2917 } 2918 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2919 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2920 vattr.va_atime.tv_sec = tv[0].tv_sec; 2921 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2922 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2923 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2924 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2925 VOP_UNLOCK(vp, 0); 2926 out: 2927 vn_finished_write(mp, 0); 2928 return (error); 2929 } 2930 2931 /* 2932 * Truncate a file given its path name. 2933 */ 2934 /* ARGSUSED */ 2935 int 2936 sys_truncate(l, v, retval) 2937 struct lwp *l; 2938 void *v; 2939 register_t *retval; 2940 { 2941 struct sys_truncate_args /* { 2942 syscallarg(const char *) path; 2943 syscallarg(int) pad; 2944 syscallarg(off_t) length; 2945 } */ *uap = v; 2946 struct proc *p = l->l_proc; 2947 struct vnode *vp; 2948 struct mount *mp; 2949 struct vattr vattr; 2950 int error; 2951 struct nameidata nd; 2952 2953 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2954 if ((error = namei(&nd)) != 0) 2955 return (error); 2956 vp = nd.ni_vp; 2957 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2958 vrele(vp); 2959 return (error); 2960 } 2961 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2962 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2963 if (vp->v_type == VDIR) 2964 error = EISDIR; 2965 else if ((error = vn_writechk(vp)) == 0 && 2966 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2967 VATTR_NULL(&vattr); 2968 vattr.va_size = SCARG(uap, length); 2969 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2970 } 2971 vput(vp); 2972 vn_finished_write(mp, 0); 2973 return (error); 2974 } 2975 2976 /* 2977 * Truncate a file given a file descriptor. 2978 */ 2979 /* ARGSUSED */ 2980 int 2981 sys_ftruncate(l, v, retval) 2982 struct lwp *l; 2983 void *v; 2984 register_t *retval; 2985 { 2986 struct sys_ftruncate_args /* { 2987 syscallarg(int) fd; 2988 syscallarg(int) pad; 2989 syscallarg(off_t) length; 2990 } */ *uap = v; 2991 struct proc *p = l->l_proc; 2992 struct mount *mp; 2993 struct vattr vattr; 2994 struct vnode *vp; 2995 struct file *fp; 2996 int error; 2997 2998 /* getvnode() will use the descriptor for us */ 2999 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3000 return (error); 3001 if ((fp->f_flag & FWRITE) == 0) { 3002 error = EINVAL; 3003 goto out; 3004 } 3005 vp = (struct vnode *)fp->f_data; 3006 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3007 FILE_UNUSE(fp, p); 3008 return (error); 3009 } 3010 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3011 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3012 if (vp->v_type == VDIR) 3013 error = EISDIR; 3014 else if ((error = vn_writechk(vp)) == 0) { 3015 VATTR_NULL(&vattr); 3016 vattr.va_size = SCARG(uap, length); 3017 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 3018 } 3019 VOP_UNLOCK(vp, 0); 3020 vn_finished_write(mp, 0); 3021 out: 3022 FILE_UNUSE(fp, p); 3023 return (error); 3024 } 3025 3026 /* 3027 * Sync an open file. 3028 */ 3029 /* ARGSUSED */ 3030 int 3031 sys_fsync(l, v, retval) 3032 struct lwp *l; 3033 void *v; 3034 register_t *retval; 3035 { 3036 struct sys_fsync_args /* { 3037 syscallarg(int) fd; 3038 } */ *uap = v; 3039 struct proc *p = l->l_proc; 3040 struct vnode *vp; 3041 struct mount *mp; 3042 struct file *fp; 3043 int error; 3044 3045 /* getvnode() will use the descriptor for us */ 3046 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3047 return (error); 3048 vp = (struct vnode *)fp->f_data; 3049 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3050 FILE_UNUSE(fp, p); 3051 return (error); 3052 } 3053 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3054 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 3055 if (error == 0 && bioops.io_fsync != NULL && 3056 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3057 (*bioops.io_fsync)(vp, 0); 3058 VOP_UNLOCK(vp, 0); 3059 vn_finished_write(mp, 0); 3060 FILE_UNUSE(fp, p); 3061 return (error); 3062 } 3063 3064 /* 3065 * Sync a range of file data. API modeled after that found in AIX. 3066 * 3067 * FDATASYNC indicates that we need only save enough metadata to be able 3068 * to re-read the written data. Note we duplicate AIX's requirement that 3069 * the file be open for writing. 3070 */ 3071 /* ARGSUSED */ 3072 int 3073 sys_fsync_range(l, v, retval) 3074 struct lwp *l; 3075 void *v; 3076 register_t *retval; 3077 { 3078 struct sys_fsync_range_args /* { 3079 syscallarg(int) fd; 3080 syscallarg(int) flags; 3081 syscallarg(off_t) start; 3082 syscallarg(int) length; 3083 } */ *uap = v; 3084 struct proc *p = l->l_proc; 3085 struct vnode *vp; 3086 struct file *fp; 3087 int flags, nflags; 3088 off_t s, e, len; 3089 int error; 3090 3091 /* getvnode() will use the descriptor for us */ 3092 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3093 return (error); 3094 3095 if ((fp->f_flag & FWRITE) == 0) { 3096 error = EBADF; 3097 goto out; 3098 } 3099 3100 flags = SCARG(uap, flags); 3101 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3102 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3103 error = EINVAL; 3104 goto out; 3105 } 3106 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3107 if (flags & FDATASYNC) 3108 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3109 else 3110 nflags = FSYNC_WAIT; 3111 if (flags & FDISKSYNC) 3112 nflags |= FSYNC_CACHE; 3113 3114 len = SCARG(uap, length); 3115 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3116 if (len) { 3117 s = SCARG(uap, start); 3118 e = s + len; 3119 if (e < s) { 3120 FILE_UNUSE(fp, p); 3121 error = EINVAL; 3122 goto out; 3123 } 3124 } else { 3125 e = 0; 3126 s = 0; 3127 } 3128 3129 vp = (struct vnode *)fp->f_data; 3130 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3131 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, p); 3132 3133 if (error == 0 && bioops.io_fsync != NULL && 3134 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3135 (*bioops.io_fsync)(vp, nflags); 3136 3137 VOP_UNLOCK(vp, 0); 3138 out: 3139 FILE_UNUSE(fp, p); 3140 return (error); 3141 } 3142 3143 /* 3144 * Sync the data of an open file. 3145 */ 3146 /* ARGSUSED */ 3147 int 3148 sys_fdatasync(l, v, retval) 3149 struct lwp *l; 3150 void *v; 3151 register_t *retval; 3152 { 3153 struct sys_fdatasync_args /* { 3154 syscallarg(int) fd; 3155 } */ *uap = v; 3156 struct proc *p = l->l_proc; 3157 struct vnode *vp; 3158 struct file *fp; 3159 int error; 3160 3161 /* getvnode() will use the descriptor for us */ 3162 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3163 return (error); 3164 if ((fp->f_flag & FWRITE) == 0) { 3165 FILE_UNUSE(fp, p); 3166 return (EBADF); 3167 } 3168 vp = (struct vnode *)fp->f_data; 3169 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3170 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 3171 VOP_UNLOCK(vp, 0); 3172 FILE_UNUSE(fp, p); 3173 return (error); 3174 } 3175 3176 /* 3177 * Rename files, (standard) BSD semantics frontend. 3178 */ 3179 /* ARGSUSED */ 3180 int 3181 sys_rename(l, v, retval) 3182 struct lwp *l; 3183 void *v; 3184 register_t *retval; 3185 { 3186 struct sys_rename_args /* { 3187 syscallarg(const char *) from; 3188 syscallarg(const char *) to; 3189 } */ *uap = v; 3190 struct proc *p = l->l_proc; 3191 3192 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 3193 } 3194 3195 /* 3196 * Rename files, POSIX semantics frontend. 3197 */ 3198 /* ARGSUSED */ 3199 int 3200 sys___posix_rename(l, v, retval) 3201 struct lwp *l; 3202 void *v; 3203 register_t *retval; 3204 { 3205 struct sys___posix_rename_args /* { 3206 syscallarg(const char *) from; 3207 syscallarg(const char *) to; 3208 } */ *uap = v; 3209 struct proc *p = l->l_proc; 3210 3211 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 3212 } 3213 3214 /* 3215 * Rename files. Source and destination must either both be directories, 3216 * or both not be directories. If target is a directory, it must be empty. 3217 * If `from' and `to' refer to the same object, the value of the `retain' 3218 * argument is used to determine whether `from' will be 3219 * 3220 * (retain == 0) deleted unless `from' and `to' refer to the same 3221 * object in the file system's name space (BSD). 3222 * (retain == 1) always retained (POSIX). 3223 */ 3224 static int 3225 rename_files(from, to, p, retain) 3226 const char *from, *to; 3227 struct proc *p; 3228 int retain; 3229 { 3230 struct mount *mp = NULL; 3231 struct vnode *tvp, *fvp, *tdvp; 3232 struct nameidata fromnd, tond; 3233 int error; 3234 3235 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 3236 from, p); 3237 if ((error = namei(&fromnd)) != 0) 3238 return (error); 3239 fvp = fromnd.ni_vp; 3240 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3241 if (error != 0) { 3242 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3243 vrele(fromnd.ni_dvp); 3244 vrele(fvp); 3245 if (fromnd.ni_startdir) 3246 vrele(fromnd.ni_startdir); 3247 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3248 return (error); 3249 } 3250 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3251 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p); 3252 if ((error = namei(&tond)) != 0) { 3253 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3254 vrele(fromnd.ni_dvp); 3255 vrele(fvp); 3256 goto out1; 3257 } 3258 tdvp = tond.ni_dvp; 3259 tvp = tond.ni_vp; 3260 3261 if (tvp != NULL) { 3262 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3263 error = ENOTDIR; 3264 goto out; 3265 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3266 error = EISDIR; 3267 goto out; 3268 } 3269 } 3270 3271 if (fvp == tdvp) 3272 error = EINVAL; 3273 3274 /* 3275 * Source and destination refer to the same object. 3276 */ 3277 if (fvp == tvp) { 3278 if (retain) 3279 error = -1; 3280 else if (fromnd.ni_dvp == tdvp && 3281 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3282 !memcmp(fromnd.ni_cnd.cn_nameptr, 3283 tond.ni_cnd.cn_nameptr, 3284 fromnd.ni_cnd.cn_namelen)) 3285 error = -1; 3286 } 3287 3288 #ifdef VERIFIED_EXEC 3289 if (!error) 3290 error = veriexec_renamechk(fvp, fromnd.ni_dirp, tond.ni_dirp); 3291 #endif /* VERIFIED_EXEC */ 3292 3293 out: 3294 if (!error) { 3295 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 3296 if (fromnd.ni_dvp != tdvp) 3297 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3298 if (tvp) { 3299 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3300 } 3301 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3302 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3303 } else { 3304 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3305 if (tdvp == tvp) 3306 vrele(tdvp); 3307 else 3308 vput(tdvp); 3309 if (tvp) 3310 vput(tvp); 3311 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3312 vrele(fromnd.ni_dvp); 3313 vrele(fvp); 3314 } 3315 vrele(tond.ni_startdir); 3316 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3317 out1: 3318 vn_finished_write(mp, 0); 3319 if (fromnd.ni_startdir) 3320 vrele(fromnd.ni_startdir); 3321 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3322 return (error == -1 ? 0 : error); 3323 } 3324 3325 /* 3326 * Make a directory file. 3327 */ 3328 /* ARGSUSED */ 3329 int 3330 sys_mkdir(l, v, retval) 3331 struct lwp *l; 3332 void *v; 3333 register_t *retval; 3334 { 3335 struct sys_mkdir_args /* { 3336 syscallarg(const char *) path; 3337 syscallarg(int) mode; 3338 } */ *uap = v; 3339 struct proc *p = l->l_proc; 3340 struct mount *mp; 3341 struct vnode *vp; 3342 struct vattr vattr; 3343 int error; 3344 struct nameidata nd; 3345 3346 restart: 3347 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3348 SCARG(uap, path), p); 3349 if ((error = namei(&nd)) != 0) 3350 return (error); 3351 vp = nd.ni_vp; 3352 if (vp != NULL) { 3353 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3354 if (nd.ni_dvp == vp) 3355 vrele(nd.ni_dvp); 3356 else 3357 vput(nd.ni_dvp); 3358 vrele(vp); 3359 return (EEXIST); 3360 } 3361 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3362 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3363 if (nd.ni_dvp == vp) 3364 vrele(nd.ni_dvp); 3365 else 3366 vput(nd.ni_dvp); 3367 if ((error = vn_start_write(NULL, &mp, 3368 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3369 return (error); 3370 goto restart; 3371 } 3372 VATTR_NULL(&vattr); 3373 vattr.va_type = VDIR; 3374 vattr.va_mode = 3375 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3376 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3377 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3378 if (!error) 3379 vput(nd.ni_vp); 3380 vn_finished_write(mp, 0); 3381 return (error); 3382 } 3383 3384 /* 3385 * Remove a directory file. 3386 */ 3387 /* ARGSUSED */ 3388 int 3389 sys_rmdir(l, v, retval) 3390 struct lwp *l; 3391 void *v; 3392 register_t *retval; 3393 { 3394 struct sys_rmdir_args /* { 3395 syscallarg(const char *) path; 3396 } */ *uap = v; 3397 struct proc *p = l->l_proc; 3398 struct mount *mp; 3399 struct vnode *vp; 3400 int error; 3401 struct nameidata nd; 3402 3403 restart: 3404 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3405 SCARG(uap, path), p); 3406 if ((error = namei(&nd)) != 0) 3407 return (error); 3408 vp = nd.ni_vp; 3409 if (vp->v_type != VDIR) { 3410 error = ENOTDIR; 3411 goto out; 3412 } 3413 /* 3414 * No rmdir "." please. 3415 */ 3416 if (nd.ni_dvp == vp) { 3417 error = EINVAL; 3418 goto out; 3419 } 3420 /* 3421 * The root of a mounted filesystem cannot be deleted. 3422 */ 3423 if (vp->v_flag & VROOT) { 3424 error = EBUSY; 3425 goto out; 3426 } 3427 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3428 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3429 if (nd.ni_dvp == vp) 3430 vrele(nd.ni_dvp); 3431 else 3432 vput(nd.ni_dvp); 3433 vput(vp); 3434 if ((error = vn_start_write(NULL, &mp, 3435 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3436 return (error); 3437 goto restart; 3438 } 3439 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3440 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3441 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3442 vn_finished_write(mp, 0); 3443 return (error); 3444 3445 out: 3446 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3447 if (nd.ni_dvp == vp) 3448 vrele(nd.ni_dvp); 3449 else 3450 vput(nd.ni_dvp); 3451 vput(vp); 3452 return (error); 3453 } 3454 3455 /* 3456 * Read a block of directory entries in a file system independent format. 3457 */ 3458 int 3459 sys_getdents(l, v, retval) 3460 struct lwp *l; 3461 void *v; 3462 register_t *retval; 3463 { 3464 struct sys_getdents_args /* { 3465 syscallarg(int) fd; 3466 syscallarg(char *) buf; 3467 syscallarg(size_t) count; 3468 } */ *uap = v; 3469 struct proc *p = l->l_proc; 3470 struct file *fp; 3471 int error, done; 3472 3473 /* getvnode() will use the descriptor for us */ 3474 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3475 return (error); 3476 if ((fp->f_flag & FREAD) == 0) { 3477 error = EBADF; 3478 goto out; 3479 } 3480 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3481 SCARG(uap, count), &done, p, 0, 0); 3482 #ifdef KTRACE 3483 if (!error && KTRPOINT(p, KTR_GENIO)) { 3484 struct iovec iov; 3485 iov.iov_base = SCARG(uap, buf); 3486 iov.iov_len = done; 3487 ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3488 } 3489 #endif 3490 *retval = done; 3491 out: 3492 FILE_UNUSE(fp, p); 3493 return (error); 3494 } 3495 3496 /* 3497 * Set the mode mask for creation of filesystem nodes. 3498 */ 3499 int 3500 sys_umask(l, v, retval) 3501 struct lwp *l; 3502 void *v; 3503 register_t *retval; 3504 { 3505 struct sys_umask_args /* { 3506 syscallarg(mode_t) newmask; 3507 } */ *uap = v; 3508 struct proc *p = l->l_proc; 3509 struct cwdinfo *cwdi; 3510 3511 cwdi = p->p_cwdi; 3512 *retval = cwdi->cwdi_cmask; 3513 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3514 return (0); 3515 } 3516 3517 /* 3518 * Void all references to file by ripping underlying filesystem 3519 * away from vnode. 3520 */ 3521 /* ARGSUSED */ 3522 int 3523 sys_revoke(l, v, retval) 3524 struct lwp *l; 3525 void *v; 3526 register_t *retval; 3527 { 3528 struct sys_revoke_args /* { 3529 syscallarg(const char *) path; 3530 } */ *uap = v; 3531 struct proc *p = l->l_proc; 3532 struct mount *mp; 3533 struct vnode *vp; 3534 struct vattr vattr; 3535 int error; 3536 struct nameidata nd; 3537 3538 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3539 if ((error = namei(&nd)) != 0) 3540 return (error); 3541 vp = nd.ni_vp; 3542 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3543 goto out; 3544 if (p->p_ucred->cr_uid != vattr.va_uid && 3545 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3546 goto out; 3547 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3548 goto out; 3549 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3550 VOP_REVOKE(vp, REVOKEALL); 3551 vn_finished_write(mp, 0); 3552 out: 3553 vrele(vp); 3554 return (error); 3555 } 3556 3557 /* 3558 * Convert a user file descriptor to a kernel file entry. 3559 */ 3560 int 3561 getvnode(fdp, fd, fpp) 3562 struct filedesc *fdp; 3563 int fd; 3564 struct file **fpp; 3565 { 3566 struct vnode *vp; 3567 struct file *fp; 3568 3569 if ((fp = fd_getfile(fdp, fd)) == NULL) 3570 return (EBADF); 3571 3572 FILE_USE(fp); 3573 3574 if (fp->f_type != DTYPE_VNODE) { 3575 FILE_UNUSE(fp, NULL); 3576 return (EINVAL); 3577 } 3578 3579 vp = (struct vnode *)fp->f_data; 3580 if (vp->v_type == VBAD) { 3581 FILE_UNUSE(fp, NULL); 3582 return (EBADF); 3583 } 3584 3585 *fpp = fp; 3586 return (0); 3587 } 3588 3589 /* 3590 * Push extended attribute configuration information into the VFS. 3591 * 3592 * NOTE: Not all file systems that support extended attributes will 3593 * require the use of this system call. 3594 */ 3595 int 3596 sys_extattrctl(struct lwp *l, void *v, register_t *retval) 3597 { 3598 struct sys_extattrctl_args /* { 3599 syscallarg(const char *) path; 3600 syscallarg(int) cmd; 3601 syscallarg(const char *) filename; 3602 syscallarg(int) attrnamespace; 3603 syscallarg(const char *) attrname; 3604 } */ *uap = v; 3605 struct proc *p = l->l_proc; 3606 struct vnode *vp; 3607 struct nameidata nd; 3608 struct mount *mp; 3609 char attrname[EXTATTR_MAXNAMELEN]; 3610 int error; 3611 3612 if (SCARG(uap, attrname) != NULL) { 3613 error = copyinstr(SCARG(uap, attrname), attrname, 3614 sizeof(attrname), NULL); 3615 if (error) 3616 return (error); 3617 } 3618 3619 vp = NULL; 3620 if (SCARG(uap, filename) != NULL) { 3621 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 3622 SCARG(uap, filename), p); 3623 error = namei(&nd); 3624 if (error) 3625 return (error); 3626 vp = nd.ni_vp; 3627 } 3628 3629 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3630 error = namei(&nd); 3631 if (error) { 3632 if (vp != NULL) 3633 vput(vp); 3634 return (error); 3635 } 3636 3637 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 3638 if (error) { 3639 if (vp != NULL) 3640 vput(vp); 3641 return (error); 3642 } 3643 3644 error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), vp, 3645 SCARG(uap, attrnamespace), 3646 SCARG(uap, attrname) != NULL ? attrname : NULL, p); 3647 3648 vn_finished_write(mp, 0); 3649 3650 if (vp != NULL) 3651 vrele(vp); 3652 3653 return (error); 3654 } 3655 3656 /* 3657 * Set a named extended attribute on a file or directory. 3658 */ 3659 static int 3660 extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3661 const void *data, size_t nbytes, struct proc *p, register_t *retval) 3662 { 3663 struct mount *mp; 3664 struct uio auio; 3665 struct iovec aiov; 3666 ssize_t cnt; 3667 int error; 3668 3669 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH); 3670 if (error) 3671 return (error); 3672 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3673 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3674 3675 aiov.iov_base = (caddr_t) data; /* XXX kills const */ 3676 aiov.iov_len = nbytes; 3677 auio.uio_iov = &aiov; 3678 auio.uio_iovcnt = 1; 3679 auio.uio_offset = 0; 3680 if (nbytes > INT_MAX) { 3681 error = EINVAL; 3682 goto done; 3683 } 3684 auio.uio_resid = nbytes; 3685 auio.uio_rw = UIO_WRITE; 3686 auio.uio_segflg = UIO_USERSPACE; 3687 auio.uio_procp = p; 3688 cnt = nbytes; 3689 3690 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, 3691 p->p_ucred, p); 3692 cnt -= auio.uio_resid; 3693 retval[0] = cnt; 3694 3695 done: 3696 VOP_UNLOCK(vp, 0); 3697 vn_finished_write(mp, 0); 3698 return (error); 3699 } 3700 3701 int 3702 sys_extattr_set_fd(struct lwp *l, void *v, register_t *retval) 3703 { 3704 struct sys_extattr_set_fd_args /* { 3705 syscallarg(int) fd; 3706 syscallarg(int) attrnamespace; 3707 syscallarg(const char *) attrname; 3708 syscallarg(const void *) data; 3709 syscallarg(size_t) nbytes; 3710 } */ *uap = v; 3711 struct proc *p = l->l_proc; 3712 struct file *fp; 3713 struct vnode *vp; 3714 char attrname[EXTATTR_MAXNAMELEN]; 3715 int error; 3716 3717 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3718 NULL); 3719 if (error) 3720 return (error); 3721 3722 error = getvnode(p->p_fd, SCARG(uap, fd), &fp); 3723 if (error) 3724 return (error); 3725 vp = (struct vnode *) fp->f_data; 3726 3727 error = extattr_set_vp(vp, SCARG(uap, attrnamespace), attrname, 3728 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3729 3730 FILE_UNUSE(fp, p); 3731 return (error); 3732 } 3733 3734 int 3735 sys_extattr_set_file(struct lwp *l, void *v, register_t *retval) 3736 { 3737 struct sys_extattr_set_file_args /* { 3738 syscallarg(const char *) path; 3739 syscallarg(int) attrnamespace; 3740 syscallarg(const char *) attrname; 3741 syscallarg(const void *) data; 3742 syscallarg(size_t) nbytes; 3743 } */ *uap = v; 3744 struct proc *p = l->l_proc; 3745 struct nameidata nd; 3746 char attrname[EXTATTR_MAXNAMELEN]; 3747 int error; 3748 3749 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3750 NULL); 3751 if (error) 3752 return (error); 3753 3754 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3755 error = namei(&nd); 3756 if (error) 3757 return (error); 3758 3759 error = extattr_set_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 3760 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3761 3762 vrele(nd.ni_vp); 3763 return (error); 3764 } 3765 3766 int 3767 sys_extattr_set_link(struct lwp *l, void *v, register_t *retval) 3768 { 3769 struct sys_extattr_set_link_args /* { 3770 syscallarg(const char *) path; 3771 syscallarg(int) attrnamespace; 3772 syscallarg(const char *) attrname; 3773 syscallarg(const void *) data; 3774 syscallarg(size_t) nbytes; 3775 } */ *uap = v; 3776 struct proc *p = l->l_proc; 3777 struct nameidata nd; 3778 char attrname[EXTATTR_MAXNAMELEN]; 3779 int error; 3780 3781 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3782 NULL); 3783 if (error) 3784 return (error); 3785 3786 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3787 error = namei(&nd); 3788 if (error) 3789 return (error); 3790 3791 error = extattr_set_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 3792 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3793 3794 vrele(nd.ni_vp); 3795 return (error); 3796 } 3797 3798 /* 3799 * Get a named extended attribute on a file or directory. 3800 */ 3801 static int 3802 extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3803 void *data, size_t nbytes, struct proc *p, register_t *retval) 3804 { 3805 struct uio auio, *auiop; 3806 struct iovec aiov; 3807 ssize_t cnt; 3808 size_t size, *sizep; 3809 int error; 3810 3811 VOP_LEASE(vp, p, p->p_ucred, LEASE_READ); 3812 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3813 3814 /* 3815 * Slightly unusual semantics: if the user provides a NULL data 3816 * pointer, they don't want to receive the data, just the maximum 3817 * read length. 3818 */ 3819 auiop = NULL; 3820 sizep = NULL; 3821 cnt = 0; 3822 if (data != NULL) { 3823 aiov.iov_base = data; 3824 aiov.iov_len = nbytes; 3825 auio.uio_iov = &aiov; 3826 auio.uio_offset = 0; 3827 if (nbytes > INT_MAX) { 3828 error = EINVAL; 3829 goto done; 3830 } 3831 auio.uio_resid = nbytes; 3832 auio.uio_rw = UIO_READ; 3833 auio.uio_segflg = UIO_USERSPACE; 3834 auio.uio_procp = p; 3835 auiop = &auio; 3836 cnt = nbytes; 3837 } else 3838 sizep = &size; 3839 3840 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep, 3841 p->p_ucred, p); 3842 3843 if (auiop != NULL) { 3844 cnt -= auio.uio_resid; 3845 retval[0] = cnt; 3846 } else 3847 retval[0] = size; 3848 3849 done: 3850 VOP_UNLOCK(vp, 0); 3851 return (error); 3852 } 3853 3854 int 3855 sys_extattr_get_fd(struct lwp *l, void *v, register_t *retval) 3856 { 3857 struct sys_extattr_get_fd_args /* { 3858 syscallarg(int) fd; 3859 syscallarg(int) attrnamespace; 3860 syscallarg(const char *) attrname; 3861 syscallarg(void *) data; 3862 syscallarg(size_t) nbytes; 3863 } */ *uap = v; 3864 struct proc *p = l->l_proc; 3865 struct file *fp; 3866 struct vnode *vp; 3867 char attrname[EXTATTR_MAXNAMELEN]; 3868 int error; 3869 3870 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3871 NULL); 3872 if (error) 3873 return (error); 3874 3875 error = getvnode(p->p_fd, SCARG(uap, fd), &fp); 3876 if (error) 3877 return (error); 3878 vp = (struct vnode *) fp->f_data; 3879 3880 error = extattr_get_vp(vp, SCARG(uap, attrnamespace), attrname, 3881 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3882 3883 FILE_UNUSE(fp, p); 3884 return (error); 3885 } 3886 3887 int 3888 sys_extattr_get_file(struct lwp *l, void *v, register_t *retval) 3889 { 3890 struct sys_extattr_get_file_args /* { 3891 syscallarg(const char *) path; 3892 syscallarg(int) attrnamespace; 3893 syscallarg(const char *) attrname; 3894 syscallarg(void *) data; 3895 syscallarg(size_t) nbytes; 3896 } */ *uap = v; 3897 struct proc *p = l->l_proc; 3898 struct nameidata nd; 3899 char attrname[EXTATTR_MAXNAMELEN]; 3900 int error; 3901 3902 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3903 NULL); 3904 if (error) 3905 return (error); 3906 3907 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3908 error = namei(&nd); 3909 if (error) 3910 return (error); 3911 3912 error = extattr_get_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 3913 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3914 3915 vrele(nd.ni_vp); 3916 return (error); 3917 } 3918 3919 int 3920 sys_extattr_get_link(struct lwp *l, void *v, register_t *retval) 3921 { 3922 struct sys_extattr_get_link_args /* { 3923 syscallarg(const char *) path; 3924 syscallarg(int) attrnamespace; 3925 syscallarg(const char *) attrname; 3926 syscallarg(void *) data; 3927 syscallarg(size_t) nbytes; 3928 } */ *uap = v; 3929 struct proc *p = l->l_proc; 3930 struct nameidata nd; 3931 char attrname[EXTATTR_MAXNAMELEN]; 3932 int error; 3933 3934 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3935 NULL); 3936 if (error) 3937 return (error); 3938 3939 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3940 error = namei(&nd); 3941 if (error) 3942 return (error); 3943 3944 error = extattr_get_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 3945 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 3946 3947 vrele(nd.ni_vp); 3948 return (error); 3949 } 3950 3951 /* 3952 * Delete a named extended attribute on a file or directory. 3953 */ 3954 static int 3955 extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3956 struct proc *p) 3957 { 3958 struct mount *mp; 3959 int error; 3960 3961 error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH); 3962 if (error) 3963 return (error); 3964 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3965 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3966 3967 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, p->p_ucred, p); 3968 if (error == EOPNOTSUPP) 3969 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, 3970 p->p_ucred, p); 3971 3972 VOP_UNLOCK(vp, 0); 3973 vn_finished_write(mp, 0); 3974 return (error); 3975 } 3976 3977 int 3978 sys_extattr_delete_fd(struct lwp *l, void *v, register_t *retval) 3979 { 3980 struct sys_extattr_delete_fd_args /* { 3981 syscallarg(int) fd; 3982 syscallarg(int) attrnamespace; 3983 syscallarg(const char *) attrname; 3984 } */ *uap = v; 3985 struct proc *p = l->l_proc; 3986 struct file *fp; 3987 struct vnode *vp; 3988 char attrname[EXTATTR_MAXNAMELEN]; 3989 int error; 3990 3991 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 3992 NULL); 3993 if (error) 3994 return (error); 3995 3996 error = getvnode(p->p_fd, SCARG(uap, fd), &fp); 3997 if (error) 3998 return (error); 3999 vp = (struct vnode *) fp->f_data; 4000 4001 error = extattr_delete_vp(vp, SCARG(uap, attrnamespace), attrname, p); 4002 4003 FILE_UNUSE(fp, p); 4004 return (error); 4005 } 4006 4007 int 4008 sys_extattr_delete_file(struct lwp *l, void *v, register_t *retval) 4009 { 4010 struct sys_extattr_delete_file_args /* { 4011 syscallarg(const char *) path; 4012 syscallarg(int) attrnamespace; 4013 syscallarg(const char *) attrname; 4014 } */ *uap = v; 4015 struct proc *p = l->l_proc; 4016 struct nameidata nd; 4017 char attrname[EXTATTR_MAXNAMELEN]; 4018 int error; 4019 4020 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 4021 NULL); 4022 if (error) 4023 return (error); 4024 4025 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 4026 error = namei(&nd); 4027 if (error) 4028 return (error); 4029 4030 error = extattr_delete_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 4031 p); 4032 4033 vrele(nd.ni_vp); 4034 return (error); 4035 } 4036 4037 int 4038 sys_extattr_delete_link(struct lwp *l, void *v, register_t *retval) 4039 { 4040 struct sys_extattr_delete_link_args /* { 4041 syscallarg(const char *) path; 4042 syscallarg(int) attrnamespace; 4043 syscallarg(const char *) attrname; 4044 } */ *uap = v; 4045 struct proc *p = l->l_proc; 4046 struct nameidata nd; 4047 char attrname[EXTATTR_MAXNAMELEN]; 4048 int error; 4049 4050 error = copyinstr(SCARG(uap, attrname), attrname, sizeof(attrname), 4051 NULL); 4052 if (error) 4053 return (error); 4054 4055 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 4056 error = namei(&nd); 4057 if (error) 4058 return (error); 4059 4060 error = extattr_delete_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname, 4061 p); 4062 4063 vrele(nd.ni_vp); 4064 return (error); 4065 } 4066 4067 /* 4068 * Retrieve a list of extended attributes on a file or directory. 4069 */ 4070 static int 4071 extattr_list_vp(struct vnode *vp, int attrnamespace, void *data, size_t nbytes, 4072 struct proc *p, register_t *retval) 4073 { 4074 struct uio auio, *auiop; 4075 size_t size, *sizep; 4076 struct iovec aiov; 4077 ssize_t cnt; 4078 int error; 4079 4080 VOP_LEASE(vp, p, p->p_ucred, LEASE_READ); 4081 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4082 4083 auiop = NULL; 4084 sizep = NULL; 4085 cnt = 0; 4086 if (data != NULL) { 4087 aiov.iov_base = data; 4088 aiov.iov_len = nbytes; 4089 auio.uio_iov = &aiov; 4090 auio.uio_offset = 0; 4091 if (nbytes > INT_MAX) { 4092 error = EINVAL; 4093 goto done; 4094 } 4095 auio.uio_resid = nbytes; 4096 auio.uio_rw = UIO_READ; 4097 auio.uio_segflg = UIO_USERSPACE; 4098 auio.uio_procp = p; 4099 auiop = &auio; 4100 cnt = nbytes; 4101 } else 4102 sizep = &size; 4103 4104 error = VOP_LISTEXTATTR(vp, attrnamespace, auiop, sizep, 4105 p->p_ucred, p); 4106 4107 if (auiop != NULL) { 4108 cnt -= auio.uio_resid; 4109 retval[0] = cnt; 4110 } else 4111 retval[0] = size; 4112 4113 done: 4114 VOP_UNLOCK(vp, 0); 4115 return (error); 4116 } 4117 4118 int 4119 sys_extattr_list_fd(struct lwp *l, void *v, register_t *retval) 4120 { 4121 struct sys_extattr_list_fd_args /* { 4122 syscallarg(int) fd; 4123 syscallarg(int) attrnamespace; 4124 syscallarg(void *) data; 4125 syscallarg(size_t) nbytes; 4126 } */ *uap = v; 4127 struct proc *p = l->l_proc; 4128 struct file *fp; 4129 struct vnode *vp; 4130 int error; 4131 4132 error = getvnode(p->p_fd, SCARG(uap, fd), &fp); 4133 if (error) 4134 return (error); 4135 vp = (struct vnode *) fp->f_data; 4136 4137 error = extattr_list_vp(vp, SCARG(uap, attrnamespace), 4138 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 4139 4140 FILE_UNUSE(fp, p); 4141 return (error); 4142 } 4143 4144 int 4145 sys_extattr_list_file(struct lwp *l, void *v, register_t *retval) 4146 { 4147 struct sys_extattr_list_file_args /* { 4148 syscallarg(const char *) path; 4149 syscallarg(int) attrnamespace; 4150 syscallarg(void *) data; 4151 syscallarg(size_t) nbytes; 4152 } */ *uap = v; 4153 struct proc *p = l->l_proc; 4154 struct nameidata nd; 4155 int error; 4156 4157 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 4158 error = namei(&nd); 4159 if (error) 4160 return (error); 4161 4162 error = extattr_list_vp(nd.ni_vp, SCARG(uap, attrnamespace), 4163 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 4164 4165 vrele(nd.ni_vp); 4166 return (error); 4167 } 4168 4169 int 4170 sys_extattr_list_link(struct lwp *l, void *v, register_t *retval) 4171 { 4172 struct sys_extattr_list_link_args /* { 4173 syscallarg(const char *) path; 4174 syscallarg(int) attrnamespace; 4175 syscallarg(void *) data; 4176 syscallarg(size_t) nbytes; 4177 } */ *uap = v; 4178 struct proc *p = l->l_proc; 4179 struct nameidata nd; 4180 int error; 4181 4182 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 4183 error = namei(&nd); 4184 if (error) 4185 return (error); 4186 4187 error = extattr_list_vp(nd.ni_vp, SCARG(uap, attrnamespace), 4188 SCARG(uap, data), SCARG(uap, nbytes), p, retval); 4189 4190 vrele(nd.ni_vp); 4191 return (error); 4192 } 4193
Indexes created Fri Oct 03 02:09:57 GMT 2025