vfs_syscalls.c revision 1.226
1 /* $NetBSD: vfs_syscalls.c,v 1.226 2005/07/16 22:47:18 christos 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 1.226 2005/07/16 22:47:18 christos Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_ktrace.h" 45 #include "opt_verified_exec.h" 46 #include "fss.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/namei.h> 51 #include <sys/filedesc.h> 52 #include <sys/kernel.h> 53 #include <sys/file.h> 54 #include <sys/stat.h> 55 #include <sys/vnode.h> 56 #include <sys/mount.h> 57 #include <sys/proc.h> 58 #include <sys/uio.h> 59 #include <sys/malloc.h> 60 #include <sys/dirent.h> 61 #include <sys/sysctl.h> 62 #include <sys/sa.h> 63 #include <sys/syscallargs.h> 64 #ifdef KTRACE 65 #include <sys/ktrace.h> 66 #endif 67 #ifdef VERIFIED_EXEC 68 #include <sys/verified_exec.h> 69 #endif 70 71 #include <miscfs/genfs/genfs.h> 72 #include <miscfs/syncfs/syncfs.h> 73 74 #if NFSS > 0 75 #include <dev/fssvar.h> 76 #endif 77 78 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 79 80 static int change_dir(struct nameidata *, struct proc *); 81 static int change_flags(struct vnode *, u_long, struct proc *); 82 static int change_mode(struct vnode *, int, struct proc *p); 83 static int change_owner(struct vnode *, uid_t, gid_t, struct proc *, int); 84 static int change_utimes(struct vnode *vp, const struct timeval *, 85 struct proc *p); 86 static int rename_files(const char *, const char *, struct proc *, int); 87 88 void checkdirs(struct vnode *); 89 90 int dovfsusermount = 0; 91 92 /* 93 * Virtual File System System Calls 94 */ 95 96 /* 97 * Mount a file system. 98 */ 99 100 #if defined(COMPAT_09) || defined(COMPAT_43) 101 /* 102 * This table is used to maintain compatibility with 4.3BSD 103 * and NetBSD 0.9 mount syscalls. Note, the order is important! 104 * 105 * Do not modify this table. It should only contain filesystems 106 * supported by NetBSD 0.9 and 4.3BSD. 107 */ 108 const char * const mountcompatnames[] = { 109 NULL, /* 0 = MOUNT_NONE */ 110 MOUNT_FFS, /* 1 = MOUNT_UFS */ 111 MOUNT_NFS, /* 2 */ 112 MOUNT_MFS, /* 3 */ 113 MOUNT_MSDOS, /* 4 */ 114 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 115 MOUNT_FDESC, /* 6 */ 116 MOUNT_KERNFS, /* 7 */ 117 NULL, /* 8 = MOUNT_DEVFS */ 118 MOUNT_AFS, /* 9 */ 119 }; 120 const int nmountcompatnames = sizeof(mountcompatnames) / 121 sizeof(mountcompatnames[0]); 122 #endif /* COMPAT_09 || COMPAT_43 */ 123 124 /* ARGSUSED */ 125 int 126 sys_mount(struct lwp *l, void *v, register_t *retval) 127 { 128 struct sys_mount_args /* { 129 syscallarg(const char *) type; 130 syscallarg(const char *) path; 131 syscallarg(int) flags; 132 syscallarg(void *) data; 133 } */ *uap = v; 134 struct proc *p = l->l_proc; 135 struct vnode *vp; 136 struct mount *mp; 137 int error, flag = 0; 138 char fstypename[MFSNAMELEN]; 139 struct vattr va; 140 struct nameidata nd; 141 struct vfsops *vfs; 142 143 /* 144 * if MNT_GETARGS is specified, it should be only flag. 145 */ 146 147 if ((SCARG(uap, flags) & MNT_GETARGS) != 0 && 148 (SCARG(uap, flags) & ~MNT_GETARGS) != 0) { 149 return EINVAL; 150 } 151 152 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 153 (error = suser(p->p_ucred, &p->p_acflag))) 154 return (error); 155 /* 156 * Get vnode to be covered 157 */ 158 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 159 SCARG(uap, path), p); 160 if ((error = namei(&nd)) != 0) 161 return (error); 162 vp = nd.ni_vp; 163 /* 164 * A lookup in VFS_MOUNT might result in an attempt to 165 * lock this vnode again, so make the lock recursive. 166 */ 167 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 168 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 169 if ((vp->v_flag & VROOT) == 0) { 170 vput(vp); 171 return (EINVAL); 172 } 173 mp = vp->v_mount; 174 flag = mp->mnt_flag; 175 vfs = mp->mnt_op; 176 /* 177 * We only allow the filesystem to be reloaded if it 178 * is currently mounted read-only. 179 */ 180 if ((SCARG(uap, flags) & MNT_RELOAD) && 181 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 182 vput(vp); 183 return (EOPNOTSUPP); /* Needs translation */ 184 } 185 /* 186 * In "highly secure" mode, don't let the caller do anything 187 * but downgrade a filesystem from read-write to read-only. 188 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 189 */ 190 if (securelevel >= 2 && 191 SCARG(uap, flags) != MNT_GETARGS && 192 SCARG(uap, flags) != 193 (mp->mnt_flag | MNT_RDONLY | 194 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 195 vput(vp); 196 return (EPERM); 197 } 198 mp->mnt_flag |= SCARG(uap, flags) & 199 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 200 /* 201 * Only root, or the user that did the original mount is 202 * permitted to update it. 203 */ 204 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 205 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 206 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 207 vput(vp); 208 return (error); 209 } 210 /* 211 * Do not allow NFS export by non-root users. For non-root 212 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 213 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 214 */ 215 if (p->p_ucred->cr_uid != 0) { 216 if (SCARG(uap, flags) & MNT_EXPORTED) { 217 vput(vp); 218 return (EPERM); 219 } 220 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 221 if (flag & MNT_NOEXEC) 222 SCARG(uap, flags) |= MNT_NOEXEC; 223 } 224 if (vfs_busy(mp, LK_NOWAIT, 0)) { 225 vput(vp); 226 return (EPERM); 227 } 228 goto update; 229 } else { 230 if (securelevel >= 2) { 231 vput(vp); 232 return (EPERM); 233 } 234 } 235 /* 236 * If the user is not root, ensure that they own the directory 237 * onto which we are attempting to mount. 238 */ 239 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 240 (va.va_uid != p->p_ucred->cr_uid && 241 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 242 vput(vp); 243 return (error); 244 } 245 /* 246 * Do not allow NFS export by non-root users. For non-root users, 247 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 248 * mount point is already MNT_NOEXEC. 249 */ 250 if (p->p_ucred->cr_uid != 0) { 251 if (SCARG(uap, flags) & MNT_EXPORTED) { 252 vput(vp); 253 return (EPERM); 254 } 255 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 256 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 257 SCARG(uap, flags) |= MNT_NOEXEC; 258 } 259 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) { 260 vput(vp); 261 return (error); 262 } 263 if (vp->v_type != VDIR) { 264 vput(vp); 265 return (ENOTDIR); 266 } 267 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 268 if (error) { 269 #if defined(COMPAT_09) || defined(COMPAT_43) 270 /* 271 * Historically filesystem types were identified by number. 272 * If we get an integer for the filesystem type instead of a 273 * string, we check to see if it matches one of the historic 274 * filesystem types. 275 */ 276 u_long fsindex = (u_long)SCARG(uap, type); 277 if (fsindex >= nmountcompatnames || 278 mountcompatnames[fsindex] == NULL) { 279 vput(vp); 280 return (ENODEV); 281 } 282 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 283 #else 284 vput(vp); 285 return (error); 286 #endif 287 } 288 #ifdef COMPAT_10 289 /* Accept `ufs' as an alias for `ffs'. */ 290 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 291 strncpy(fstypename, "ffs", MFSNAMELEN); 292 #endif 293 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 294 vput(vp); 295 return (ENODEV); 296 } 297 if (vp->v_mountedhere != NULL) { 298 vput(vp); 299 return (EBUSY); 300 } 301 302 /* 303 * Allocate and initialize the file system. 304 */ 305 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 306 M_MOUNT, M_WAITOK); 307 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 308 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 309 simple_lock_init(&mp->mnt_slock); 310 (void)vfs_busy(mp, LK_NOWAIT, 0); 311 mp->mnt_op = vfs; 312 vfs->vfs_refcount++; 313 mp->mnt_vnodecovered = vp; 314 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 315 mp->mnt_unmounter = NULL; 316 mp->mnt_leaf = mp; 317 318 /* 319 * The underlying file system may refuse the mount for 320 * various reasons. Allow the user to force it to happen. 321 */ 322 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 323 update: 324 if ((SCARG(uap, flags) & MNT_GETARGS) == 0) { 325 /* 326 * Set the mount level flags. 327 */ 328 if (SCARG(uap, flags) & MNT_RDONLY) 329 mp->mnt_flag |= MNT_RDONLY; 330 else if (mp->mnt_flag & MNT_RDONLY) 331 mp->mnt_iflag |= IMNT_WANTRDWR; 332 mp->mnt_flag &= 333 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 334 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 335 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 336 MNT_MAGICLINKS); 337 mp->mnt_flag |= SCARG(uap, flags) & 338 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 339 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 340 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 341 MNT_IGNORE | MNT_MAGICLINKS); 342 } 343 /* 344 * Mount the filesystem. 345 */ 346 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 347 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 348 if (mp->mnt_iflag & IMNT_WANTRDWR) 349 mp->mnt_flag &= ~MNT_RDONLY; 350 if (error) 351 mp->mnt_flag = flag; 352 mp->mnt_flag &=~ 353 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 354 mp->mnt_iflag &=~ IMNT_WANTRDWR; 355 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 356 if (mp->mnt_syncer == NULL) 357 error = vfs_allocate_syncvnode(mp); 358 } else { 359 if (mp->mnt_syncer != NULL) 360 vfs_deallocate_syncvnode(mp); 361 } 362 vfs_unbusy(mp); 363 VOP_UNLOCK(vp, 0); 364 vrele(vp); 365 return (error); 366 } 367 /* 368 * Put the new filesystem on the mount list after root. 369 */ 370 cache_purge(vp); 371 if (!error) { 372 mp->mnt_flag &=~ 373 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 374 mp->mnt_iflag &=~ IMNT_WANTRDWR; 375 vp->v_mountedhere = mp; 376 simple_lock(&mountlist_slock); 377 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 378 simple_unlock(&mountlist_slock); 379 checkdirs(vp); 380 VOP_UNLOCK(vp, 0); 381 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 382 error = vfs_allocate_syncvnode(mp); 383 vfs_unbusy(mp); 384 (void) VFS_STATVFS(mp, &mp->mnt_stat, p); 385 if ((error = VFS_START(mp, 0, p))) 386 vrele(vp); 387 } else { 388 vp->v_mountedhere = (struct mount *)0; 389 vfs->vfs_refcount--; 390 vfs_unbusy(mp); 391 free(mp, M_MOUNT); 392 vput(vp); 393 } 394 return (error); 395 } 396 397 /* 398 * Scan all active processes to see if any of them have a current 399 * or root directory onto which the new filesystem has just been 400 * mounted. If so, replace them with the new mount point. 401 */ 402 void 403 checkdirs(struct vnode *olddp) 404 { 405 struct cwdinfo *cwdi; 406 struct vnode *newdp; 407 struct proc *p; 408 409 if (olddp->v_usecount == 1) 410 return; 411 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 412 panic("mount: lost mount"); 413 proclist_lock_read(); 414 PROCLIST_FOREACH(p, &allproc) { 415 cwdi = p->p_cwdi; 416 if (!cwdi) 417 continue; 418 if (cwdi->cwdi_cdir == olddp) { 419 vrele(cwdi->cwdi_cdir); 420 VREF(newdp); 421 cwdi->cwdi_cdir = newdp; 422 } 423 if (cwdi->cwdi_rdir == olddp) { 424 vrele(cwdi->cwdi_rdir); 425 VREF(newdp); 426 cwdi->cwdi_rdir = newdp; 427 } 428 } 429 proclist_unlock_read(); 430 if (rootvnode == olddp) { 431 vrele(rootvnode); 432 VREF(newdp); 433 rootvnode = newdp; 434 } 435 vput(newdp); 436 } 437 438 /* 439 * Unmount a file system. 440 * 441 * Note: unmount takes a path to the vnode mounted on as argument, 442 * not special file (as before). 443 */ 444 /* ARGSUSED */ 445 int 446 sys_unmount(struct lwp *l, void *v, register_t *retval) 447 { 448 struct sys_unmount_args /* { 449 syscallarg(const char *) path; 450 syscallarg(int) flags; 451 } */ *uap = v; 452 struct proc *p = l->l_proc; 453 struct vnode *vp; 454 struct mount *mp; 455 int error; 456 struct nameidata nd; 457 458 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 459 SCARG(uap, path), p); 460 if ((error = namei(&nd)) != 0) 461 return (error); 462 vp = nd.ni_vp; 463 mp = vp->v_mount; 464 465 /* 466 * Only root, or the user that did the original mount is 467 * permitted to unmount this filesystem. 468 */ 469 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 470 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 471 vput(vp); 472 return (error); 473 } 474 475 /* 476 * Don't allow unmounting the root file system. 477 */ 478 if (mp->mnt_flag & MNT_ROOTFS) { 479 vput(vp); 480 return (EINVAL); 481 } 482 483 /* 484 * Must be the root of the filesystem 485 */ 486 if ((vp->v_flag & VROOT) == 0) { 487 vput(vp); 488 return (EINVAL); 489 } 490 vput(vp); 491 492 /* 493 * XXX Freeze syncer. Must do this before locking the 494 * mount point. See dounmount() for details. 495 */ 496 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 497 498 if (vfs_busy(mp, 0, 0)) { 499 lockmgr(&syncer_lock, LK_RELEASE, NULL); 500 return (EBUSY); 501 } 502 503 return (dounmount(mp, SCARG(uap, flags), p)); 504 } 505 506 /* 507 * Do the actual file system unmount. File system is assumed to have been 508 * marked busy by the caller. 509 */ 510 int 511 dounmount(struct mount *mp, int flags, struct proc *p) 512 { 513 struct vnode *coveredvp; 514 int error; 515 int async; 516 int used_syncer; 517 518 simple_lock(&mountlist_slock); 519 vfs_unbusy(mp); 520 used_syncer = (mp->mnt_syncer != NULL); 521 522 /* 523 * XXX Syncer must be frozen when we get here. This should really 524 * be done on a per-mountpoint basis, but especially the softdep 525 * code possibly called from the syncer doens't exactly work on a 526 * per-mountpoint basis, so the softdep code would become a maze 527 * of vfs_busy() calls. 528 * 529 * The caller of dounmount() must acquire syncer_lock because 530 * the syncer itself acquires locks in syncer_lock -> vfs_busy 531 * order, and we must preserve that order to avoid deadlock. 532 * 533 * So, if the file system did not use the syncer, now is 534 * the time to release the syncer_lock. 535 */ 536 if (used_syncer == 0) 537 lockmgr(&syncer_lock, LK_RELEASE, NULL); 538 539 mp->mnt_iflag |= IMNT_UNMOUNT; 540 mp->mnt_unmounter = p; 541 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 542 vn_start_write(NULL, &mp, V_WAIT); 543 544 if (mp->mnt_flag & MNT_EXPUBLIC) 545 vfs_setpublicfs(NULL, NULL, NULL); 546 async = mp->mnt_flag & MNT_ASYNC; 547 mp->mnt_flag &= ~MNT_ASYNC; 548 cache_purgevfs(mp); /* remove cache entries for this file sys */ 549 if (mp->mnt_syncer != NULL) 550 vfs_deallocate_syncvnode(mp); 551 error = 0; 552 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 553 #if NFSS > 0 554 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 555 #endif 556 if (error == 0) 557 error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p); 558 } 559 if (error == 0 || (flags & MNT_FORCE)) 560 error = VFS_UNMOUNT(mp, flags, p); 561 vn_finished_write(mp, 0); 562 simple_lock(&mountlist_slock); 563 if (error) { 564 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 565 (void) vfs_allocate_syncvnode(mp); 566 mp->mnt_iflag &= ~IMNT_UNMOUNT; 567 mp->mnt_unmounter = NULL; 568 mp->mnt_flag |= async; 569 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 570 &mountlist_slock); 571 if (used_syncer) 572 lockmgr(&syncer_lock, LK_RELEASE, NULL); 573 simple_lock(&mp->mnt_slock); 574 while (mp->mnt_wcnt > 0) { 575 wakeup(mp); 576 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 577 0, &mp->mnt_slock); 578 } 579 simple_unlock(&mp->mnt_slock); 580 return (error); 581 } 582 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 583 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 584 coveredvp->v_mountedhere = NULL; 585 vrele(coveredvp); 586 } 587 mp->mnt_op->vfs_refcount--; 588 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 589 panic("unmount: dangling vnode"); 590 mp->mnt_iflag |= IMNT_GONE; 591 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 592 if (used_syncer) 593 lockmgr(&syncer_lock, LK_RELEASE, NULL); 594 simple_lock(&mp->mnt_slock); 595 while (mp->mnt_wcnt > 0) { 596 wakeup(mp); 597 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 598 } 599 simple_unlock(&mp->mnt_slock); 600 free(mp, M_MOUNT); 601 return (0); 602 } 603 604 /* 605 * Sync each mounted filesystem. 606 */ 607 #ifdef DEBUG 608 int syncprt = 0; 609 struct ctldebug debug0 = { "syncprt", &syncprt }; 610 #endif 611 612 /* ARGSUSED */ 613 int 614 sys_sync(struct lwp *l, void *v, register_t *retval) 615 { 616 struct mount *mp, *nmp; 617 int asyncflag; 618 struct proc *p = l == NULL ? &proc0 : l->l_proc; 619 620 simple_lock(&mountlist_slock); 621 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 622 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 623 nmp = mp->mnt_list.cqe_prev; 624 continue; 625 } 626 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 627 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 628 asyncflag = mp->mnt_flag & MNT_ASYNC; 629 mp->mnt_flag &= ~MNT_ASYNC; 630 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 631 if (asyncflag) 632 mp->mnt_flag |= MNT_ASYNC; 633 vn_finished_write(mp, 0); 634 } 635 simple_lock(&mountlist_slock); 636 nmp = mp->mnt_list.cqe_prev; 637 vfs_unbusy(mp); 638 639 } 640 simple_unlock(&mountlist_slock); 641 #ifdef DEBUG 642 if (syncprt) 643 vfs_bufstats(); 644 #endif /* DEBUG */ 645 return (0); 646 } 647 648 /* 649 * Change filesystem quotas. 650 */ 651 /* ARGSUSED */ 652 int 653 sys_quotactl(struct lwp *l, void *v, register_t *retval) 654 { 655 struct sys_quotactl_args /* { 656 syscallarg(const char *) path; 657 syscallarg(int) cmd; 658 syscallarg(int) uid; 659 syscallarg(caddr_t) arg; 660 } */ *uap = v; 661 struct proc *p = l->l_proc; 662 struct mount *mp; 663 int error; 664 struct nameidata nd; 665 666 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 667 if ((error = namei(&nd)) != 0) 668 return (error); 669 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 670 vrele(nd.ni_vp); 671 if (error) 672 return (error); 673 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 674 SCARG(uap, arg), p); 675 vn_finished_write(mp, 0); 676 return (error); 677 } 678 679 int 680 dostatvfs(struct mount *mp, struct statvfs *sp, struct proc *p, int flags, 681 int root) 682 { 683 struct cwdinfo *cwdi = p->p_cwdi; 684 int error = 0; 685 686 /* 687 * If MNT_NOWAIT or MNT_LAZY is specified, do not 688 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 689 * overrides MNT_NOWAIT. 690 */ 691 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 692 (flags != MNT_WAIT && flags != 0)) { 693 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 694 goto done; 695 } 696 697 /* Get the filesystem stats now */ 698 memset(sp, 0, sizeof(*sp)); 699 if ((error = VFS_STATVFS(mp, sp, p)) != 0) { 700 return error; 701 } 702 703 if (cwdi->cwdi_rdir == NULL) 704 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 705 done: 706 if (cwdi->cwdi_rdir != NULL) { 707 size_t len; 708 char *bp; 709 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 710 if (!path) 711 return ENOMEM; 712 713 bp = path + MAXPATHLEN; 714 *--bp = '\0'; 715 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 716 MAXPATHLEN / 2, 0, p); 717 if (error) { 718 free(path, M_TEMP); 719 return error; 720 } 721 len = strlen(bp); 722 /* 723 * for mount points that are below our root, we can see 724 * them, so we fix up the pathname and return them. The 725 * rest we cannot see, so we don't allow viewing the 726 * data. 727 */ 728 if (strncmp(bp, sp->f_mntonname, len) == 0) { 729 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 730 sizeof(sp->f_mntonname)); 731 if (sp->f_mntonname[0] == '\0') 732 (void)strlcpy(sp->f_mntonname, "/", 733 sizeof(sp->f_mntonname)); 734 } else { 735 if (root) 736 (void)strlcpy(sp->f_mntonname, "/", 737 sizeof(sp->f_mntonname)); 738 else 739 error = EPERM; 740 } 741 free(path, M_TEMP); 742 } 743 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 744 return error; 745 } 746 747 /* 748 * Get filesystem statistics. 749 */ 750 /* ARGSUSED */ 751 int 752 sys_statvfs1(struct lwp *l, void *v, register_t *retval) 753 { 754 struct sys_statvfs1_args /* { 755 syscallarg(const char *) path; 756 syscallarg(struct statvfs *) buf; 757 syscallarg(int) flags; 758 } */ *uap = v; 759 struct proc *p = l->l_proc; 760 struct mount *mp; 761 struct statvfs sbuf; 762 int error; 763 struct nameidata nd; 764 765 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 766 if ((error = namei(&nd)) != 0) 767 return error; 768 mp = nd.ni_vp->v_mount; 769 vrele(nd.ni_vp); 770 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 771 return error; 772 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 773 } 774 775 /* 776 * Get filesystem statistics. 777 */ 778 /* ARGSUSED */ 779 int 780 sys_fstatvfs1(struct lwp *l, void *v, register_t *retval) 781 { 782 struct sys_fstatvfs1_args /* { 783 syscallarg(int) fd; 784 syscallarg(struct statvfs *) buf; 785 syscallarg(int) flags; 786 } */ *uap = v; 787 struct proc *p = l->l_proc; 788 struct file *fp; 789 struct mount *mp; 790 struct statvfs sbuf; 791 int error; 792 793 /* getvnode() will use the descriptor for us */ 794 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 795 return (error); 796 mp = ((struct vnode *)fp->f_data)->v_mount; 797 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 798 goto out; 799 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 800 out: 801 FILE_UNUSE(fp, p); 802 return error; 803 } 804 805 806 /* 807 * Get statistics on all filesystems. 808 */ 809 int 810 sys_getvfsstat(struct lwp *l, void *v, register_t *retval) 811 { 812 struct sys_getvfsstat_args /* { 813 syscallarg(struct statvfs *) buf; 814 syscallarg(size_t) bufsize; 815 syscallarg(int) flags; 816 } */ *uap = v; 817 int root = 0; 818 struct proc *p = l->l_proc; 819 struct mount *mp, *nmp; 820 struct statvfs sbuf; 821 struct statvfs *sfsp; 822 size_t count, maxcount; 823 int error = 0; 824 825 maxcount = SCARG(uap, bufsize) / sizeof(struct statvfs); 826 sfsp = SCARG(uap, buf); 827 simple_lock(&mountlist_slock); 828 count = 0; 829 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 830 mp = nmp) { 831 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 832 nmp = CIRCLEQ_NEXT(mp, mnt_list); 833 continue; 834 } 835 if (sfsp && count < maxcount) { 836 error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 0); 837 if (error) { 838 simple_lock(&mountlist_slock); 839 nmp = CIRCLEQ_NEXT(mp, mnt_list); 840 vfs_unbusy(mp); 841 continue; 842 } 843 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 844 if (error) { 845 vfs_unbusy(mp); 846 return (error); 847 } 848 sfsp++; 849 root |= strcmp(sbuf.f_mntonname, "/") == 0; 850 } 851 count++; 852 simple_lock(&mountlist_slock); 853 nmp = CIRCLEQ_NEXT(mp, mnt_list); 854 vfs_unbusy(mp); 855 } 856 simple_unlock(&mountlist_slock); 857 if (root == 0 && p->p_cwdi->cwdi_rdir) { 858 /* 859 * fake a root entry 860 */ 861 if ((error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 862 SCARG(uap, flags), 1)) != 0) 863 return error; 864 if (sfsp) 865 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 866 count++; 867 } 868 if (sfsp && count > maxcount) 869 *retval = maxcount; 870 else 871 *retval = count; 872 return error; 873 } 874 875 /* 876 * Change current working directory to a given file descriptor. 877 */ 878 /* ARGSUSED */ 879 int 880 sys_fchdir(struct lwp *l, void *v, register_t *retval) 881 { 882 struct sys_fchdir_args /* { 883 syscallarg(int) fd; 884 } */ *uap = v; 885 struct proc *p = l->l_proc; 886 struct filedesc *fdp = p->p_fd; 887 struct cwdinfo *cwdi = p->p_cwdi; 888 struct vnode *vp, *tdp; 889 struct mount *mp; 890 struct file *fp; 891 int error; 892 893 /* getvnode() will use the descriptor for us */ 894 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 895 return (error); 896 vp = (struct vnode *)fp->f_data; 897 898 VREF(vp); 899 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 900 if (vp->v_type != VDIR) 901 error = ENOTDIR; 902 else 903 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 904 while (!error && (mp = vp->v_mountedhere) != NULL) { 905 if (vfs_busy(mp, 0, 0)) 906 continue; 907 error = VFS_ROOT(mp, &tdp); 908 vfs_unbusy(mp); 909 if (error) 910 break; 911 vput(vp); 912 vp = tdp; 913 } 914 if (error) { 915 vput(vp); 916 goto out; 917 } 918 VOP_UNLOCK(vp, 0); 919 920 /* 921 * Disallow changing to a directory not under the process's 922 * current root directory (if there is one). 923 */ 924 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 925 vrele(vp); 926 error = EPERM; /* operation not permitted */ 927 goto out; 928 } 929 930 vrele(cwdi->cwdi_cdir); 931 cwdi->cwdi_cdir = vp; 932 out: 933 FILE_UNUSE(fp, p); 934 return (error); 935 } 936 937 /* 938 * Change this process's notion of the root directory to a given file 939 * descriptor. 940 */ 941 int 942 sys_fchroot(struct lwp *l, void *v, register_t *retval) 943 { 944 struct sys_fchroot_args *uap = v; 945 struct proc *p = l->l_proc; 946 struct filedesc *fdp = p->p_fd; 947 struct cwdinfo *cwdi = p->p_cwdi; 948 struct vnode *vp; 949 struct file *fp; 950 int error; 951 952 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 953 return error; 954 /* getvnode() will use the descriptor for us */ 955 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 956 return error; 957 vp = (struct vnode *) fp->f_data; 958 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 959 if (vp->v_type != VDIR) 960 error = ENOTDIR; 961 else 962 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 963 VOP_UNLOCK(vp, 0); 964 if (error) 965 goto out; 966 VREF(vp); 967 968 /* 969 * Prevent escaping from chroot by putting the root under 970 * the working directory. Silently chdir to / if we aren't 971 * already there. 972 */ 973 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 974 /* 975 * XXX would be more failsafe to change directory to a 976 * deadfs node here instead 977 */ 978 vrele(cwdi->cwdi_cdir); 979 VREF(vp); 980 cwdi->cwdi_cdir = vp; 981 } 982 983 if (cwdi->cwdi_rdir != NULL) 984 vrele(cwdi->cwdi_rdir); 985 cwdi->cwdi_rdir = vp; 986 out: 987 FILE_UNUSE(fp, p); 988 return (error); 989 } 990 991 /* 992 * Change current working directory (``.''). 993 */ 994 /* ARGSUSED */ 995 int 996 sys_chdir(struct lwp *l, void *v, register_t *retval) 997 { 998 struct sys_chdir_args /* { 999 syscallarg(const char *) path; 1000 } */ *uap = v; 1001 struct proc *p = l->l_proc; 1002 struct cwdinfo *cwdi = p->p_cwdi; 1003 int error; 1004 struct nameidata nd; 1005 1006 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1007 SCARG(uap, path), p); 1008 if ((error = change_dir(&nd, p)) != 0) 1009 return (error); 1010 vrele(cwdi->cwdi_cdir); 1011 cwdi->cwdi_cdir = nd.ni_vp; 1012 return (0); 1013 } 1014 1015 /* 1016 * Change notion of root (``/'') directory. 1017 */ 1018 /* ARGSUSED */ 1019 int 1020 sys_chroot(struct lwp *l, void *v, register_t *retval) 1021 { 1022 struct sys_chroot_args /* { 1023 syscallarg(const char *) path; 1024 } */ *uap = v; 1025 struct proc *p = l->l_proc; 1026 struct cwdinfo *cwdi = p->p_cwdi; 1027 struct vnode *vp; 1028 int error; 1029 struct nameidata nd; 1030 1031 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1032 return (error); 1033 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1034 SCARG(uap, path), p); 1035 if ((error = change_dir(&nd, p)) != 0) 1036 return (error); 1037 if (cwdi->cwdi_rdir != NULL) 1038 vrele(cwdi->cwdi_rdir); 1039 vp = nd.ni_vp; 1040 cwdi->cwdi_rdir = vp; 1041 1042 /* 1043 * Prevent escaping from chroot by putting the root under 1044 * the working directory. Silently chdir to / if we aren't 1045 * already there. 1046 */ 1047 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1048 /* 1049 * XXX would be more failsafe to change directory to a 1050 * deadfs node here instead 1051 */ 1052 vrele(cwdi->cwdi_cdir); 1053 VREF(vp); 1054 cwdi->cwdi_cdir = vp; 1055 } 1056 1057 return (0); 1058 } 1059 1060 /* 1061 * Common routine for chroot and chdir. 1062 */ 1063 static int 1064 change_dir(struct nameidata *ndp, struct proc *p) 1065 { 1066 struct vnode *vp; 1067 int error; 1068 1069 if ((error = namei(ndp)) != 0) 1070 return (error); 1071 vp = ndp->ni_vp; 1072 if (vp->v_type != VDIR) 1073 error = ENOTDIR; 1074 else 1075 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1076 1077 if (error) 1078 vput(vp); 1079 else 1080 VOP_UNLOCK(vp, 0); 1081 return (error); 1082 } 1083 1084 /* 1085 * Check permissions, allocate an open file structure, 1086 * and call the device open routine if any. 1087 */ 1088 int 1089 sys_open(struct lwp *l, void *v, register_t *retval) 1090 { 1091 struct sys_open_args /* { 1092 syscallarg(const char *) path; 1093 syscallarg(int) flags; 1094 syscallarg(int) mode; 1095 } */ *uap = v; 1096 struct proc *p = l->l_proc; 1097 struct cwdinfo *cwdi = p->p_cwdi; 1098 struct filedesc *fdp = p->p_fd; 1099 struct file *fp; 1100 struct vnode *vp; 1101 int flags, cmode; 1102 int type, indx, error; 1103 struct flock lf; 1104 struct nameidata nd; 1105 1106 flags = FFLAGS(SCARG(uap, flags)); 1107 if ((flags & (FREAD | FWRITE)) == 0) 1108 return (EINVAL); 1109 /* falloc() will use the file descriptor for us */ 1110 if ((error = falloc(p, &fp, &indx)) != 0) 1111 return (error); 1112 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1113 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1114 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1115 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1116 FILE_UNUSE(fp, p); 1117 fdp->fd_ofiles[indx] = NULL; 1118 ffree(fp); 1119 if ((error == EDUPFD || error == EMOVEFD) && 1120 l->l_dupfd >= 0 && /* XXX from fdopen */ 1121 (error = 1122 dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) { 1123 *retval = indx; 1124 return (0); 1125 } 1126 if (error == ERESTART) 1127 error = EINTR; 1128 fdremove(fdp, indx); 1129 return (error); 1130 } 1131 l->l_dupfd = 0; 1132 vp = nd.ni_vp; 1133 fp->f_flag = flags & FMASK; 1134 fp->f_type = DTYPE_VNODE; 1135 fp->f_ops = &vnops; 1136 fp->f_data = vp; 1137 if (flags & (O_EXLOCK | O_SHLOCK)) { 1138 lf.l_whence = SEEK_SET; 1139 lf.l_start = 0; 1140 lf.l_len = 0; 1141 if (flags & O_EXLOCK) 1142 lf.l_type = F_WRLCK; 1143 else 1144 lf.l_type = F_RDLCK; 1145 type = F_FLOCK; 1146 if ((flags & FNONBLOCK) == 0) 1147 type |= F_WAIT; 1148 VOP_UNLOCK(vp, 0); 1149 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1150 if (error) { 1151 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1152 FILE_UNUSE(fp, p); 1153 ffree(fp); 1154 fdremove(fdp, indx); 1155 return (error); 1156 } 1157 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1158 fp->f_flag |= FHASLOCK; 1159 } 1160 VOP_UNLOCK(vp, 0); 1161 *retval = indx; 1162 FILE_SET_MATURE(fp); 1163 FILE_UNUSE(fp, p); 1164 return (0); 1165 } 1166 1167 /* 1168 * Get file handle system call 1169 */ 1170 int 1171 sys_getfh(struct lwp *l, void *v, register_t *retval) 1172 { 1173 struct sys_getfh_args /* { 1174 syscallarg(char *) fname; 1175 syscallarg(fhandle_t *) fhp; 1176 } */ *uap = v; 1177 struct proc *p = l->l_proc; 1178 struct vnode *vp; 1179 fhandle_t fh; 1180 int error; 1181 struct nameidata nd; 1182 1183 /* 1184 * Must be super user 1185 */ 1186 error = suser(p->p_ucred, &p->p_acflag); 1187 if (error) 1188 return (error); 1189 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1190 SCARG(uap, fname), p); 1191 error = namei(&nd); 1192 if (error) 1193 return (error); 1194 vp = nd.ni_vp; 1195 memset(&fh, 0, sizeof(fh)); 1196 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsidx; 1197 error = VFS_VPTOFH(vp, &fh.fh_fid); 1198 vput(vp); 1199 if (error) 1200 return (error); 1201 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1202 return (error); 1203 } 1204 1205 /* 1206 * Open a file given a file handle. 1207 * 1208 * Check permissions, allocate an open file structure, 1209 * and call the device open routine if any. 1210 */ 1211 int 1212 sys_fhopen(struct lwp *l, void *v, register_t *retval) 1213 { 1214 struct sys_fhopen_args /* { 1215 syscallarg(const fhandle_t *) fhp; 1216 syscallarg(int) flags; 1217 } */ *uap = v; 1218 struct proc *p = l->l_proc; 1219 struct filedesc *fdp = p->p_fd; 1220 struct file *fp; 1221 struct vnode *vp = NULL; 1222 struct mount *mp; 1223 struct ucred *cred = p->p_ucred; 1224 int flags; 1225 struct file *nfp; 1226 int type, indx, error=0; 1227 struct flock lf; 1228 struct vattr va; 1229 fhandle_t fh; 1230 1231 /* 1232 * Must be super user 1233 */ 1234 if ((error = suser(p->p_ucred, &p->p_acflag))) 1235 return (error); 1236 1237 flags = FFLAGS(SCARG(uap, flags)); 1238 if ((flags & (FREAD | FWRITE)) == 0) 1239 return (EINVAL); 1240 if ((flags & O_CREAT)) 1241 return (EINVAL); 1242 /* falloc() will use the file descriptor for us */ 1243 if ((error = falloc(p, &nfp, &indx)) != 0) 1244 return (error); 1245 fp = nfp; 1246 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1247 goto bad; 1248 1249 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1250 error = ESTALE; 1251 goto bad; 1252 } 1253 1254 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1255 vp = NULL; /* most likely unnecessary sanity for bad: */ 1256 goto bad; 1257 } 1258 1259 /* Now do an effective vn_open */ 1260 1261 if (vp->v_type == VSOCK) { 1262 error = EOPNOTSUPP; 1263 goto bad; 1264 } 1265 if (flags & FREAD) { 1266 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1267 goto bad; 1268 } 1269 if (flags & (FWRITE | O_TRUNC)) { 1270 if (vp->v_type == VDIR) { 1271 error = EISDIR; 1272 goto bad; 1273 } 1274 if ((error = vn_writechk(vp)) != 0 || 1275 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1276 goto bad; 1277 } 1278 if (flags & O_TRUNC) { 1279 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1280 goto bad; 1281 VOP_UNLOCK(vp, 0); /* XXX */ 1282 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1283 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1284 VATTR_NULL(&va); 1285 va.va_size = 0; 1286 error = VOP_SETATTR(vp, &va, cred, p); 1287 vn_finished_write(mp, 0); 1288 if (error) 1289 goto bad; 1290 } 1291 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1292 goto bad; 1293 if (vp->v_type == VREG && 1294 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1295 error = EIO; 1296 goto bad; 1297 } 1298 if (flags & FWRITE) 1299 vp->v_writecount++; 1300 1301 /* done with modified vn_open, now finish what sys_open does. */ 1302 1303 fp->f_flag = flags & FMASK; 1304 fp->f_type = DTYPE_VNODE; 1305 fp->f_ops = &vnops; 1306 fp->f_data = vp; 1307 if (flags & (O_EXLOCK | O_SHLOCK)) { 1308 lf.l_whence = SEEK_SET; 1309 lf.l_start = 0; 1310 lf.l_len = 0; 1311 if (flags & O_EXLOCK) 1312 lf.l_type = F_WRLCK; 1313 else 1314 lf.l_type = F_RDLCK; 1315 type = F_FLOCK; 1316 if ((flags & FNONBLOCK) == 0) 1317 type |= F_WAIT; 1318 VOP_UNLOCK(vp, 0); 1319 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1320 if (error) { 1321 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1322 FILE_UNUSE(fp, p); 1323 ffree(fp); 1324 fdremove(fdp, indx); 1325 return (error); 1326 } 1327 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1328 fp->f_flag |= FHASLOCK; 1329 } 1330 VOP_UNLOCK(vp, 0); 1331 *retval = indx; 1332 FILE_SET_MATURE(fp); 1333 FILE_UNUSE(fp, p); 1334 return (0); 1335 1336 bad: 1337 FILE_UNUSE(fp, p); 1338 ffree(fp); 1339 fdremove(fdp, indx); 1340 if (vp != NULL) 1341 vput(vp); 1342 return (error); 1343 } 1344 1345 /* ARGSUSED */ 1346 int 1347 sys_fhstat(struct lwp *l, void *v, register_t *retval) 1348 { 1349 struct sys_fhstat_args /* { 1350 syscallarg(const fhandle_t *) fhp; 1351 syscallarg(struct stat *) sb; 1352 } */ *uap = v; 1353 struct proc *p = l->l_proc; 1354 struct stat sb; 1355 int error; 1356 fhandle_t fh; 1357 struct mount *mp; 1358 struct vnode *vp; 1359 1360 /* 1361 * Must be super user 1362 */ 1363 if ((error = suser(p->p_ucred, &p->p_acflag))) 1364 return (error); 1365 1366 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1367 return (error); 1368 1369 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1370 return (ESTALE); 1371 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1372 return (error); 1373 error = vn_stat(vp, &sb, p); 1374 vput(vp); 1375 if (error) 1376 return (error); 1377 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1378 return (error); 1379 } 1380 1381 /* ARGSUSED */ 1382 int 1383 sys_fhstatvfs1(struct lwp *l, void *v, register_t *retval) 1384 { 1385 struct sys_fhstatvfs1_args /* { 1386 syscallarg(const fhandle_t *) fhp; 1387 syscallarg(struct statvfs *) buf; 1388 syscallarg(int) flags; 1389 } */ *uap = v; 1390 struct proc *p = l->l_proc; 1391 struct statvfs sbuf; 1392 fhandle_t fh; 1393 struct mount *mp; 1394 struct vnode *vp; 1395 int error; 1396 1397 /* 1398 * Must be super user 1399 */ 1400 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1401 return error; 1402 1403 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1404 return error; 1405 1406 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1407 return ESTALE; 1408 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1409 return error; 1410 1411 mp = vp->v_mount; 1412 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) { 1413 vput(vp); 1414 return error; 1415 } 1416 vput(vp); 1417 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 1418 } 1419 1420 /* 1421 * Create a special file. 1422 */ 1423 /* ARGSUSED */ 1424 int 1425 sys_mknod(struct lwp *l, void *v, register_t *retval) 1426 { 1427 struct sys_mknod_args /* { 1428 syscallarg(const char *) path; 1429 syscallarg(int) mode; 1430 syscallarg(int) dev; 1431 } */ *uap = v; 1432 struct proc *p = l->l_proc; 1433 struct vnode *vp; 1434 struct mount *mp; 1435 struct vattr vattr; 1436 int error; 1437 int whiteout = 0; 1438 struct nameidata nd; 1439 1440 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1441 return (error); 1442 restart: 1443 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1444 if ((error = namei(&nd)) != 0) 1445 return (error); 1446 vp = nd.ni_vp; 1447 if (vp != NULL) 1448 error = EEXIST; 1449 else { 1450 VATTR_NULL(&vattr); 1451 vattr.va_mode = 1452 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1453 vattr.va_rdev = SCARG(uap, dev); 1454 whiteout = 0; 1455 1456 switch (SCARG(uap, mode) & S_IFMT) { 1457 case S_IFMT: /* used by badsect to flag bad sectors */ 1458 vattr.va_type = VBAD; 1459 break; 1460 case S_IFCHR: 1461 vattr.va_type = VCHR; 1462 break; 1463 case S_IFBLK: 1464 vattr.va_type = VBLK; 1465 break; 1466 case S_IFWHT: 1467 whiteout = 1; 1468 break; 1469 default: 1470 error = EINVAL; 1471 break; 1472 } 1473 } 1474 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1475 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1476 if (nd.ni_dvp == vp) 1477 vrele(nd.ni_dvp); 1478 else 1479 vput(nd.ni_dvp); 1480 if (vp) 1481 vrele(vp); 1482 if ((error = vn_start_write(NULL, &mp, 1483 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1484 return (error); 1485 goto restart; 1486 } 1487 if (!error) { 1488 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1489 if (whiteout) { 1490 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1491 if (error) 1492 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1493 vput(nd.ni_dvp); 1494 } else { 1495 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1496 &nd.ni_cnd, &vattr); 1497 if (error == 0) 1498 vput(nd.ni_vp); 1499 } 1500 } else { 1501 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1502 if (nd.ni_dvp == vp) 1503 vrele(nd.ni_dvp); 1504 else 1505 vput(nd.ni_dvp); 1506 if (vp) 1507 vrele(vp); 1508 } 1509 vn_finished_write(mp, 0); 1510 return (error); 1511 } 1512 1513 /* 1514 * Create a named pipe. 1515 */ 1516 /* ARGSUSED */ 1517 int 1518 sys_mkfifo(struct lwp *l, void *v, register_t *retval) 1519 { 1520 struct sys_mkfifo_args /* { 1521 syscallarg(const char *) path; 1522 syscallarg(int) mode; 1523 } */ *uap = v; 1524 struct proc *p = l->l_proc; 1525 struct mount *mp; 1526 struct vattr vattr; 1527 int error; 1528 struct nameidata nd; 1529 1530 restart: 1531 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1532 if ((error = namei(&nd)) != 0) 1533 return (error); 1534 if (nd.ni_vp != NULL) { 1535 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1536 if (nd.ni_dvp == nd.ni_vp) 1537 vrele(nd.ni_dvp); 1538 else 1539 vput(nd.ni_dvp); 1540 vrele(nd.ni_vp); 1541 return (EEXIST); 1542 } 1543 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1544 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1545 if (nd.ni_dvp == nd.ni_vp) 1546 vrele(nd.ni_dvp); 1547 else 1548 vput(nd.ni_dvp); 1549 if (nd.ni_vp) 1550 vrele(nd.ni_vp); 1551 if ((error = vn_start_write(NULL, &mp, 1552 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1553 return (error); 1554 goto restart; 1555 } 1556 VATTR_NULL(&vattr); 1557 vattr.va_type = VFIFO; 1558 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1559 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1560 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1561 if (error == 0) 1562 vput(nd.ni_vp); 1563 vn_finished_write(mp, 0); 1564 return (error); 1565 } 1566 1567 /* 1568 * Make a hard file link. 1569 */ 1570 /* ARGSUSED */ 1571 int 1572 sys_link(struct lwp *l, void *v, register_t *retval) 1573 { 1574 struct sys_link_args /* { 1575 syscallarg(const char *) path; 1576 syscallarg(const char *) link; 1577 } */ *uap = v; 1578 struct proc *p = l->l_proc; 1579 struct vnode *vp; 1580 struct mount *mp; 1581 struct nameidata nd; 1582 int error; 1583 1584 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1585 if ((error = namei(&nd)) != 0) 1586 return (error); 1587 vp = nd.ni_vp; 1588 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1589 vrele(vp); 1590 return (error); 1591 } 1592 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1593 if ((error = namei(&nd)) != 0) 1594 goto out; 1595 if (nd.ni_vp) { 1596 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1597 if (nd.ni_dvp == nd.ni_vp) 1598 vrele(nd.ni_dvp); 1599 else 1600 vput(nd.ni_dvp); 1601 vrele(nd.ni_vp); 1602 error = EEXIST; 1603 goto out; 1604 } 1605 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1606 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1607 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1608 out: 1609 vrele(vp); 1610 vn_finished_write(mp, 0); 1611 return (error); 1612 } 1613 1614 /* 1615 * Make a symbolic link. 1616 */ 1617 /* ARGSUSED */ 1618 int 1619 sys_symlink(struct lwp *l, void *v, register_t *retval) 1620 { 1621 struct sys_symlink_args /* { 1622 syscallarg(const char *) path; 1623 syscallarg(const char *) link; 1624 } */ *uap = v; 1625 struct proc *p = l->l_proc; 1626 struct mount *mp; 1627 struct vattr vattr; 1628 char *path; 1629 int error; 1630 struct nameidata nd; 1631 1632 path = PNBUF_GET(); 1633 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1634 if (error) 1635 goto out; 1636 restart: 1637 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1638 if ((error = namei(&nd)) != 0) 1639 goto out; 1640 if (nd.ni_vp) { 1641 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1642 if (nd.ni_dvp == nd.ni_vp) 1643 vrele(nd.ni_dvp); 1644 else 1645 vput(nd.ni_dvp); 1646 vrele(nd.ni_vp); 1647 error = EEXIST; 1648 goto out; 1649 } 1650 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1651 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1652 if (nd.ni_dvp == nd.ni_vp) 1653 vrele(nd.ni_dvp); 1654 else 1655 vput(nd.ni_dvp); 1656 if ((error = vn_start_write(NULL, &mp, 1657 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1658 return (error); 1659 goto restart; 1660 } 1661 VATTR_NULL(&vattr); 1662 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1663 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1664 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1665 if (error == 0) 1666 vput(nd.ni_vp); 1667 vn_finished_write(mp, 0); 1668 out: 1669 PNBUF_PUT(path); 1670 return (error); 1671 } 1672 1673 /* 1674 * Delete a whiteout from the filesystem. 1675 */ 1676 /* ARGSUSED */ 1677 int 1678 sys_undelete(struct lwp *l, void *v, register_t *retval) 1679 { 1680 struct sys_undelete_args /* { 1681 syscallarg(const char *) path; 1682 } */ *uap = v; 1683 struct proc *p = l->l_proc; 1684 int error; 1685 struct mount *mp; 1686 struct nameidata nd; 1687 1688 restart: 1689 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1690 SCARG(uap, path), p); 1691 error = namei(&nd); 1692 if (error) 1693 return (error); 1694 1695 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1696 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1697 if (nd.ni_dvp == nd.ni_vp) 1698 vrele(nd.ni_dvp); 1699 else 1700 vput(nd.ni_dvp); 1701 if (nd.ni_vp) 1702 vrele(nd.ni_vp); 1703 return (EEXIST); 1704 } 1705 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1706 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1707 if (nd.ni_dvp == nd.ni_vp) 1708 vrele(nd.ni_dvp); 1709 else 1710 vput(nd.ni_dvp); 1711 if ((error = vn_start_write(NULL, &mp, 1712 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1713 return (error); 1714 goto restart; 1715 } 1716 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1717 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1718 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1719 vput(nd.ni_dvp); 1720 vn_finished_write(mp, 0); 1721 return (error); 1722 } 1723 1724 /* 1725 * Delete a name from the filesystem. 1726 */ 1727 /* ARGSUSED */ 1728 int 1729 sys_unlink(struct lwp *l, void *v, register_t *retval) 1730 { 1731 struct sys_unlink_args /* { 1732 syscallarg(const char *) path; 1733 } */ *uap = v; 1734 struct proc *p = l->l_proc; 1735 struct mount *mp; 1736 struct vnode *vp; 1737 int error; 1738 struct nameidata nd; 1739 1740 restart: 1741 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1742 SCARG(uap, path), p); 1743 if ((error = namei(&nd)) != 0) 1744 return (error); 1745 vp = nd.ni_vp; 1746 1747 /* 1748 * The root of a mounted filesystem cannot be deleted. 1749 */ 1750 if (vp->v_flag & VROOT) { 1751 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1752 if (nd.ni_dvp == vp) 1753 vrele(nd.ni_dvp); 1754 else 1755 vput(nd.ni_dvp); 1756 vput(vp); 1757 error = EBUSY; 1758 goto out; 1759 } 1760 1761 #ifdef VERIFIED_EXEC 1762 /* Handle remove requests for veriexec entries. */ 1763 if ((error = veriexec_removechk(p, vp, nd.ni_dirp)) != 0) { 1764 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1765 if (nd.ni_dvp == vp) 1766 vrele(nd.ni_dvp); 1767 else 1768 vput(nd.ni_dvp); 1769 vput(vp); 1770 goto out; 1771 } 1772 #endif 1773 1774 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1775 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1776 if (nd.ni_dvp == vp) 1777 vrele(nd.ni_dvp); 1778 else 1779 vput(nd.ni_dvp); 1780 vput(vp); 1781 if ((error = vn_start_write(NULL, &mp, 1782 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1783 return (error); 1784 goto restart; 1785 } 1786 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1787 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1788 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1789 vn_finished_write(mp, 0); 1790 out: 1791 return (error); 1792 } 1793 1794 /* 1795 * Reposition read/write file offset. 1796 */ 1797 int 1798 sys_lseek(struct lwp *l, void *v, register_t *retval) 1799 { 1800 struct sys_lseek_args /* { 1801 syscallarg(int) fd; 1802 syscallarg(int) pad; 1803 syscallarg(off_t) offset; 1804 syscallarg(int) whence; 1805 } */ *uap = v; 1806 struct proc *p = l->l_proc; 1807 struct ucred *cred = p->p_ucred; 1808 struct filedesc *fdp = p->p_fd; 1809 struct file *fp; 1810 struct vnode *vp; 1811 struct vattr vattr; 1812 off_t newoff; 1813 int error; 1814 1815 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1816 return (EBADF); 1817 1818 FILE_USE(fp); 1819 1820 vp = (struct vnode *)fp->f_data; 1821 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1822 error = ESPIPE; 1823 goto out; 1824 } 1825 1826 switch (SCARG(uap, whence)) { 1827 case SEEK_CUR: 1828 newoff = fp->f_offset + SCARG(uap, offset); 1829 break; 1830 case SEEK_END: 1831 error = VOP_GETATTR(vp, &vattr, cred, p); 1832 if (error) 1833 goto out; 1834 newoff = SCARG(uap, offset) + vattr.va_size; 1835 break; 1836 case SEEK_SET: 1837 newoff = SCARG(uap, offset); 1838 break; 1839 default: 1840 error = EINVAL; 1841 goto out; 1842 } 1843 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1844 goto out; 1845 1846 *(off_t *)retval = fp->f_offset = newoff; 1847 out: 1848 FILE_UNUSE(fp, p); 1849 return (error); 1850 } 1851 1852 /* 1853 * Positional read system call. 1854 */ 1855 int 1856 sys_pread(struct lwp *l, void *v, register_t *retval) 1857 { 1858 struct sys_pread_args /* { 1859 syscallarg(int) fd; 1860 syscallarg(void *) buf; 1861 syscallarg(size_t) nbyte; 1862 syscallarg(off_t) offset; 1863 } */ *uap = v; 1864 struct proc *p = l->l_proc; 1865 struct filedesc *fdp = p->p_fd; 1866 struct file *fp; 1867 struct vnode *vp; 1868 off_t offset; 1869 int error, fd = SCARG(uap, fd); 1870 1871 if ((fp = fd_getfile(fdp, fd)) == NULL) 1872 return (EBADF); 1873 1874 if ((fp->f_flag & FREAD) == 0) { 1875 simple_unlock(&fp->f_slock); 1876 return (EBADF); 1877 } 1878 1879 FILE_USE(fp); 1880 1881 vp = (struct vnode *)fp->f_data; 1882 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1883 error = ESPIPE; 1884 goto out; 1885 } 1886 1887 offset = SCARG(uap, offset); 1888 1889 /* 1890 * XXX This works because no file systems actually 1891 * XXX take any action on the seek operation. 1892 */ 1893 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1894 goto out; 1895 1896 /* dofileread() will unuse the descriptor for us */ 1897 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1898 &offset, 0, retval)); 1899 1900 out: 1901 FILE_UNUSE(fp, p); 1902 return (error); 1903 } 1904 1905 /* 1906 * Positional scatter read system call. 1907 */ 1908 int 1909 sys_preadv(struct lwp *l, void *v, register_t *retval) 1910 { 1911 struct sys_preadv_args /* { 1912 syscallarg(int) fd; 1913 syscallarg(const struct iovec *) iovp; 1914 syscallarg(int) iovcnt; 1915 syscallarg(off_t) offset; 1916 } */ *uap = v; 1917 struct proc *p = l->l_proc; 1918 struct filedesc *fdp = p->p_fd; 1919 struct file *fp; 1920 struct vnode *vp; 1921 off_t offset; 1922 int error, fd = SCARG(uap, fd); 1923 1924 if ((fp = fd_getfile(fdp, fd)) == NULL) 1925 return (EBADF); 1926 1927 if ((fp->f_flag & FREAD) == 0) { 1928 simple_unlock(&fp->f_slock); 1929 return (EBADF); 1930 } 1931 1932 FILE_USE(fp); 1933 1934 vp = (struct vnode *)fp->f_data; 1935 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1936 error = ESPIPE; 1937 goto out; 1938 } 1939 1940 offset = SCARG(uap, offset); 1941 1942 /* 1943 * XXX This works because no file systems actually 1944 * XXX take any action on the seek operation. 1945 */ 1946 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1947 goto out; 1948 1949 /* dofilereadv() will unuse the descriptor for us */ 1950 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1951 &offset, 0, retval)); 1952 1953 out: 1954 FILE_UNUSE(fp, p); 1955 return (error); 1956 } 1957 1958 /* 1959 * Positional write system call. 1960 */ 1961 int 1962 sys_pwrite(struct lwp *l, void *v, register_t *retval) 1963 { 1964 struct sys_pwrite_args /* { 1965 syscallarg(int) fd; 1966 syscallarg(const void *) buf; 1967 syscallarg(size_t) nbyte; 1968 syscallarg(off_t) offset; 1969 } */ *uap = v; 1970 struct proc *p = l->l_proc; 1971 struct filedesc *fdp = p->p_fd; 1972 struct file *fp; 1973 struct vnode *vp; 1974 off_t offset; 1975 int error, fd = SCARG(uap, fd); 1976 1977 if ((fp = fd_getfile(fdp, fd)) == NULL) 1978 return (EBADF); 1979 1980 if ((fp->f_flag & FWRITE) == 0) { 1981 simple_unlock(&fp->f_slock); 1982 return (EBADF); 1983 } 1984 1985 FILE_USE(fp); 1986 1987 vp = (struct vnode *)fp->f_data; 1988 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1989 error = ESPIPE; 1990 goto out; 1991 } 1992 1993 offset = SCARG(uap, offset); 1994 1995 /* 1996 * XXX This works because no file systems actually 1997 * XXX take any action on the seek operation. 1998 */ 1999 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2000 goto out; 2001 2002 /* dofilewrite() will unuse the descriptor for us */ 2003 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2004 &offset, 0, retval)); 2005 2006 out: 2007 FILE_UNUSE(fp, p); 2008 return (error); 2009 } 2010 2011 /* 2012 * Positional gather write system call. 2013 */ 2014 int 2015 sys_pwritev(struct lwp *l, void *v, register_t *retval) 2016 { 2017 struct sys_pwritev_args /* { 2018 syscallarg(int) fd; 2019 syscallarg(const struct iovec *) iovp; 2020 syscallarg(int) iovcnt; 2021 syscallarg(off_t) offset; 2022 } */ *uap = v; 2023 struct proc *p = l->l_proc; 2024 struct filedesc *fdp = p->p_fd; 2025 struct file *fp; 2026 struct vnode *vp; 2027 off_t offset; 2028 int error, fd = SCARG(uap, fd); 2029 2030 if ((fp = fd_getfile(fdp, fd)) == NULL) 2031 return (EBADF); 2032 2033 if ((fp->f_flag & FWRITE) == 0) { 2034 simple_unlock(&fp->f_slock); 2035 return (EBADF); 2036 } 2037 2038 FILE_USE(fp); 2039 2040 vp = (struct vnode *)fp->f_data; 2041 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2042 error = ESPIPE; 2043 goto out; 2044 } 2045 2046 offset = SCARG(uap, offset); 2047 2048 /* 2049 * XXX This works because no file systems actually 2050 * XXX take any action on the seek operation. 2051 */ 2052 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2053 goto out; 2054 2055 /* dofilewritev() will unuse the descriptor for us */ 2056 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2057 &offset, 0, retval)); 2058 2059 out: 2060 FILE_UNUSE(fp, p); 2061 return (error); 2062 } 2063 2064 /* 2065 * Check access permissions. 2066 */ 2067 int 2068 sys_access(struct lwp *l, void *v, register_t *retval) 2069 { 2070 struct sys_access_args /* { 2071 syscallarg(const char *) path; 2072 syscallarg(int) flags; 2073 } */ *uap = v; 2074 struct proc *p = l->l_proc; 2075 struct ucred *cred; 2076 struct vnode *vp; 2077 int error, flags; 2078 struct nameidata nd; 2079 2080 cred = crdup(p->p_ucred); 2081 cred->cr_uid = p->p_cred->p_ruid; 2082 cred->cr_gid = p->p_cred->p_rgid; 2083 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2084 SCARG(uap, path), p); 2085 /* Override default credentials */ 2086 nd.ni_cnd.cn_cred = cred; 2087 if ((error = namei(&nd)) != 0) 2088 goto out; 2089 vp = nd.ni_vp; 2090 2091 /* Flags == 0 means only check for existence. */ 2092 if (SCARG(uap, flags)) { 2093 flags = 0; 2094 if (SCARG(uap, flags) & R_OK) 2095 flags |= VREAD; 2096 if (SCARG(uap, flags) & W_OK) 2097 flags |= VWRITE; 2098 if (SCARG(uap, flags) & X_OK) 2099 flags |= VEXEC; 2100 2101 error = VOP_ACCESS(vp, flags, cred, p); 2102 if (!error && (flags & VWRITE)) 2103 error = vn_writechk(vp); 2104 } 2105 vput(vp); 2106 out: 2107 crfree(cred); 2108 return (error); 2109 } 2110 2111 /* 2112 * Get file status; this version follows links. 2113 */ 2114 /* ARGSUSED */ 2115 int 2116 sys___stat13(struct lwp *l, void *v, register_t *retval) 2117 { 2118 struct sys___stat13_args /* { 2119 syscallarg(const char *) path; 2120 syscallarg(struct stat *) ub; 2121 } */ *uap = v; 2122 struct proc *p = l->l_proc; 2123 struct stat sb; 2124 int error; 2125 struct nameidata nd; 2126 2127 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2128 SCARG(uap, path), p); 2129 if ((error = namei(&nd)) != 0) 2130 return (error); 2131 error = vn_stat(nd.ni_vp, &sb, p); 2132 vput(nd.ni_vp); 2133 if (error) 2134 return (error); 2135 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2136 return (error); 2137 } 2138 2139 /* 2140 * Get file status; this version does not follow links. 2141 */ 2142 /* ARGSUSED */ 2143 int 2144 sys___lstat13(struct lwp *l, void *v, register_t *retval) 2145 { 2146 struct sys___lstat13_args /* { 2147 syscallarg(const char *) path; 2148 syscallarg(struct stat *) ub; 2149 } */ *uap = v; 2150 struct proc *p = l->l_proc; 2151 struct stat sb; 2152 int error; 2153 struct nameidata nd; 2154 2155 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2156 SCARG(uap, path), p); 2157 if ((error = namei(&nd)) != 0) 2158 return (error); 2159 error = vn_stat(nd.ni_vp, &sb, p); 2160 vput(nd.ni_vp); 2161 if (error) 2162 return (error); 2163 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2164 return (error); 2165 } 2166 2167 /* 2168 * Get configurable pathname variables. 2169 */ 2170 /* ARGSUSED */ 2171 int 2172 sys_pathconf(struct lwp *l, void *v, register_t *retval) 2173 { 2174 struct sys_pathconf_args /* { 2175 syscallarg(const char *) path; 2176 syscallarg(int) name; 2177 } */ *uap = v; 2178 struct proc *p = l->l_proc; 2179 int error; 2180 struct nameidata nd; 2181 2182 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2183 SCARG(uap, path), p); 2184 if ((error = namei(&nd)) != 0) 2185 return (error); 2186 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2187 vput(nd.ni_vp); 2188 return (error); 2189 } 2190 2191 /* 2192 * Return target name of a symbolic link. 2193 */ 2194 /* ARGSUSED */ 2195 int 2196 sys_readlink(struct lwp *l, void *v, register_t *retval) 2197 { 2198 struct sys_readlink_args /* { 2199 syscallarg(const char *) path; 2200 syscallarg(char *) buf; 2201 syscallarg(size_t) count; 2202 } */ *uap = v; 2203 struct proc *p = l->l_proc; 2204 struct vnode *vp; 2205 struct iovec aiov; 2206 struct uio auio; 2207 int error; 2208 struct nameidata nd; 2209 2210 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2211 SCARG(uap, path), p); 2212 if ((error = namei(&nd)) != 0) 2213 return (error); 2214 vp = nd.ni_vp; 2215 if (vp->v_type != VLNK) 2216 error = EINVAL; 2217 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2218 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2219 aiov.iov_base = SCARG(uap, buf); 2220 aiov.iov_len = SCARG(uap, count); 2221 auio.uio_iov = &aiov; 2222 auio.uio_iovcnt = 1; 2223 auio.uio_offset = 0; 2224 auio.uio_rw = UIO_READ; 2225 auio.uio_segflg = UIO_USERSPACE; 2226 auio.uio_procp = p; 2227 auio.uio_resid = SCARG(uap, count); 2228 error = VOP_READLINK(vp, &auio, p->p_ucred); 2229 } 2230 vput(vp); 2231 *retval = SCARG(uap, count) - auio.uio_resid; 2232 return (error); 2233 } 2234 2235 /* 2236 * Change flags of a file given a path name. 2237 */ 2238 /* ARGSUSED */ 2239 int 2240 sys_chflags(struct lwp *l, void *v, register_t *retval) 2241 { 2242 struct sys_chflags_args /* { 2243 syscallarg(const char *) path; 2244 syscallarg(u_long) flags; 2245 } */ *uap = v; 2246 struct proc *p = l->l_proc; 2247 struct vnode *vp; 2248 int error; 2249 struct nameidata nd; 2250 2251 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2252 if ((error = namei(&nd)) != 0) 2253 return (error); 2254 vp = nd.ni_vp; 2255 error = change_flags(vp, SCARG(uap, flags), p); 2256 vput(vp); 2257 return (error); 2258 } 2259 2260 /* 2261 * Change flags of a file given a file descriptor. 2262 */ 2263 /* ARGSUSED */ 2264 int 2265 sys_fchflags(struct lwp *l, void *v, register_t *retval) 2266 { 2267 struct sys_fchflags_args /* { 2268 syscallarg(int) fd; 2269 syscallarg(u_long) flags; 2270 } */ *uap = v; 2271 struct proc *p = l->l_proc; 2272 struct vnode *vp; 2273 struct file *fp; 2274 int error; 2275 2276 /* getvnode() will use the descriptor for us */ 2277 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2278 return (error); 2279 vp = (struct vnode *)fp->f_data; 2280 error = change_flags(vp, SCARG(uap, flags), p); 2281 VOP_UNLOCK(vp, 0); 2282 FILE_UNUSE(fp, p); 2283 return (error); 2284 } 2285 2286 /* 2287 * Change flags of a file given a path name; this version does 2288 * not follow links. 2289 */ 2290 int 2291 sys_lchflags(struct lwp *l, void *v, register_t *retval) 2292 { 2293 struct sys_lchflags_args /* { 2294 syscallarg(const char *) path; 2295 syscallarg(u_long) flags; 2296 } */ *uap = v; 2297 struct proc *p = l->l_proc; 2298 struct vnode *vp; 2299 int error; 2300 struct nameidata nd; 2301 2302 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2303 if ((error = namei(&nd)) != 0) 2304 return (error); 2305 vp = nd.ni_vp; 2306 error = change_flags(vp, SCARG(uap, flags), p); 2307 vput(vp); 2308 return (error); 2309 } 2310 2311 /* 2312 * Common routine to change flags of a file. 2313 */ 2314 int 2315 change_flags(struct vnode *vp, u_long flags, struct proc *p) 2316 { 2317 struct mount *mp; 2318 struct vattr vattr; 2319 int error; 2320 2321 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2322 return (error); 2323 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2324 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2325 /* 2326 * Non-superusers cannot change the flags on devices, even if they 2327 * own them. 2328 */ 2329 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2330 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2331 goto out; 2332 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2333 error = EINVAL; 2334 goto out; 2335 } 2336 } 2337 VATTR_NULL(&vattr); 2338 vattr.va_flags = flags; 2339 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2340 out: 2341 vn_finished_write(mp, 0); 2342 return (error); 2343 } 2344 2345 /* 2346 * Change mode of a file given path name; this version follows links. 2347 */ 2348 /* ARGSUSED */ 2349 int 2350 sys_chmod(struct lwp *l, void *v, register_t *retval) 2351 { 2352 struct sys_chmod_args /* { 2353 syscallarg(const char *) path; 2354 syscallarg(int) mode; 2355 } */ *uap = v; 2356 struct proc *p = l->l_proc; 2357 int error; 2358 struct nameidata nd; 2359 2360 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2361 if ((error = namei(&nd)) != 0) 2362 return (error); 2363 2364 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2365 2366 vrele(nd.ni_vp); 2367 return (error); 2368 } 2369 2370 /* 2371 * Change mode of a file given a file descriptor. 2372 */ 2373 /* ARGSUSED */ 2374 int 2375 sys_fchmod(struct lwp *l, void *v, register_t *retval) 2376 { 2377 struct sys_fchmod_args /* { 2378 syscallarg(int) fd; 2379 syscallarg(int) mode; 2380 } */ *uap = v; 2381 struct proc *p = l->l_proc; 2382 struct file *fp; 2383 int error; 2384 2385 /* getvnode() will use the descriptor for us */ 2386 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2387 return (error); 2388 2389 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2390 FILE_UNUSE(fp, p); 2391 return (error); 2392 } 2393 2394 /* 2395 * Change mode of a file given path name; this version does not follow links. 2396 */ 2397 /* ARGSUSED */ 2398 int 2399 sys_lchmod(struct lwp *l, void *v, register_t *retval) 2400 { 2401 struct sys_lchmod_args /* { 2402 syscallarg(const char *) path; 2403 syscallarg(int) mode; 2404 } */ *uap = v; 2405 struct proc *p = l->l_proc; 2406 int error; 2407 struct nameidata nd; 2408 2409 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2410 if ((error = namei(&nd)) != 0) 2411 return (error); 2412 2413 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2414 2415 vrele(nd.ni_vp); 2416 return (error); 2417 } 2418 2419 /* 2420 * Common routine to set mode given a vnode. 2421 */ 2422 static int 2423 change_mode(struct vnode *vp, int mode, struct proc *p) 2424 { 2425 struct mount *mp; 2426 struct vattr vattr; 2427 int error; 2428 2429 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2430 return (error); 2431 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2432 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2433 VATTR_NULL(&vattr); 2434 vattr.va_mode = mode & ALLPERMS; 2435 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2436 VOP_UNLOCK(vp, 0); 2437 vn_finished_write(mp, 0); 2438 return (error); 2439 } 2440 2441 /* 2442 * Set ownership given a path name; this version follows links. 2443 */ 2444 /* ARGSUSED */ 2445 int 2446 sys_chown(struct lwp *l, void *v, register_t *retval) 2447 { 2448 struct sys_chown_args /* { 2449 syscallarg(const char *) path; 2450 syscallarg(uid_t) uid; 2451 syscallarg(gid_t) gid; 2452 } */ *uap = v; 2453 struct proc *p = l->l_proc; 2454 int error; 2455 struct nameidata nd; 2456 2457 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2458 if ((error = namei(&nd)) != 0) 2459 return (error); 2460 2461 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2462 2463 vrele(nd.ni_vp); 2464 return (error); 2465 } 2466 2467 /* 2468 * Set ownership given a path name; this version follows links. 2469 * Provides POSIX semantics. 2470 */ 2471 /* ARGSUSED */ 2472 int 2473 sys___posix_chown(struct lwp *l, void *v, register_t *retval) 2474 { 2475 struct sys_chown_args /* { 2476 syscallarg(const char *) path; 2477 syscallarg(uid_t) uid; 2478 syscallarg(gid_t) gid; 2479 } */ *uap = v; 2480 struct proc *p = l->l_proc; 2481 int error; 2482 struct nameidata nd; 2483 2484 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2485 if ((error = namei(&nd)) != 0) 2486 return (error); 2487 2488 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2489 2490 vrele(nd.ni_vp); 2491 return (error); 2492 } 2493 2494 /* 2495 * Set ownership given a file descriptor. 2496 */ 2497 /* ARGSUSED */ 2498 int 2499 sys_fchown(struct lwp *l, void *v, register_t *retval) 2500 { 2501 struct sys_fchown_args /* { 2502 syscallarg(int) fd; 2503 syscallarg(uid_t) uid; 2504 syscallarg(gid_t) gid; 2505 } */ *uap = v; 2506 struct proc *p = l->l_proc; 2507 int error; 2508 struct file *fp; 2509 2510 /* getvnode() will use the descriptor for us */ 2511 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2512 return (error); 2513 2514 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2515 SCARG(uap, gid), p, 0); 2516 FILE_UNUSE(fp, p); 2517 return (error); 2518 } 2519 2520 /* 2521 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2522 */ 2523 /* ARGSUSED */ 2524 int 2525 sys___posix_fchown(struct lwp *l, void *v, register_t *retval) 2526 { 2527 struct sys_fchown_args /* { 2528 syscallarg(int) fd; 2529 syscallarg(uid_t) uid; 2530 syscallarg(gid_t) gid; 2531 } */ *uap = v; 2532 struct proc *p = l->l_proc; 2533 int error; 2534 struct file *fp; 2535 2536 /* getvnode() will use the descriptor for us */ 2537 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2538 return (error); 2539 2540 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2541 SCARG(uap, gid), p, 1); 2542 FILE_UNUSE(fp, p); 2543 return (error); 2544 } 2545 2546 /* 2547 * Set ownership given a path name; this version does not follow links. 2548 */ 2549 /* ARGSUSED */ 2550 int 2551 sys_lchown(struct lwp *l, void *v, register_t *retval) 2552 { 2553 struct sys_lchown_args /* { 2554 syscallarg(const char *) path; 2555 syscallarg(uid_t) uid; 2556 syscallarg(gid_t) gid; 2557 } */ *uap = v; 2558 struct proc *p = l->l_proc; 2559 int error; 2560 struct nameidata nd; 2561 2562 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2563 if ((error = namei(&nd)) != 0) 2564 return (error); 2565 2566 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2567 2568 vrele(nd.ni_vp); 2569 return (error); 2570 } 2571 2572 /* 2573 * Set ownership given a path name; this version does not follow links. 2574 * Provides POSIX/XPG semantics. 2575 */ 2576 /* ARGSUSED */ 2577 int 2578 sys___posix_lchown(struct lwp *l, void *v, register_t *retval) 2579 { 2580 struct sys_lchown_args /* { 2581 syscallarg(const char *) path; 2582 syscallarg(uid_t) uid; 2583 syscallarg(gid_t) gid; 2584 } */ *uap = v; 2585 struct proc *p = l->l_proc; 2586 int error; 2587 struct nameidata nd; 2588 2589 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2590 if ((error = namei(&nd)) != 0) 2591 return (error); 2592 2593 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2594 2595 vrele(nd.ni_vp); 2596 return (error); 2597 } 2598 2599 /* 2600 * Common routine to set ownership given a vnode. 2601 */ 2602 static int 2603 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct proc *p, 2604 int posix_semantics) 2605 { 2606 struct mount *mp; 2607 struct vattr vattr; 2608 mode_t newmode; 2609 int error; 2610 2611 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2612 return (error); 2613 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2615 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2616 goto out; 2617 2618 #define CHANGED(x) ((int)(x) != -1) 2619 newmode = vattr.va_mode; 2620 if (posix_semantics) { 2621 /* 2622 * POSIX/XPG semantics: if the caller is not the super-user, 2623 * clear set-user-id and set-group-id bits. Both POSIX and 2624 * the XPG consider the behaviour for calls by the super-user 2625 * implementation-defined; we leave the set-user-id and set- 2626 * group-id settings intact in that case. 2627 */ 2628 if (suser(p->p_ucred, NULL) != 0) 2629 newmode &= ~(S_ISUID | S_ISGID); 2630 } else { 2631 /* 2632 * NetBSD semantics: when changing owner and/or group, 2633 * clear the respective bit(s). 2634 */ 2635 if (CHANGED(uid)) 2636 newmode &= ~S_ISUID; 2637 if (CHANGED(gid)) 2638 newmode &= ~S_ISGID; 2639 } 2640 /* Update va_mode iff altered. */ 2641 if (vattr.va_mode == newmode) 2642 newmode = VNOVAL; 2643 2644 VATTR_NULL(&vattr); 2645 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2646 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2647 vattr.va_mode = newmode; 2648 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2649 #undef CHANGED 2650 2651 out: 2652 VOP_UNLOCK(vp, 0); 2653 vn_finished_write(mp, 0); 2654 return (error); 2655 } 2656 2657 /* 2658 * Set the access and modification times given a path name; this 2659 * version follows links. 2660 */ 2661 /* ARGSUSED */ 2662 int 2663 sys_utimes(struct lwp *l, void *v, register_t *retval) 2664 { 2665 struct sys_utimes_args /* { 2666 syscallarg(const char *) path; 2667 syscallarg(const struct timeval *) tptr; 2668 } */ *uap = v; 2669 struct proc *p = l->l_proc; 2670 int error; 2671 struct nameidata nd; 2672 2673 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2674 if ((error = namei(&nd)) != 0) 2675 return (error); 2676 2677 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2678 2679 vrele(nd.ni_vp); 2680 return (error); 2681 } 2682 2683 /* 2684 * Set the access and modification times given a file descriptor. 2685 */ 2686 /* ARGSUSED */ 2687 int 2688 sys_futimes(struct lwp *l, void *v, register_t *retval) 2689 { 2690 struct sys_futimes_args /* { 2691 syscallarg(int) fd; 2692 syscallarg(const struct timeval *) tptr; 2693 } */ *uap = v; 2694 struct proc *p = l->l_proc; 2695 int error; 2696 struct file *fp; 2697 2698 /* getvnode() will use the descriptor for us */ 2699 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2700 return (error); 2701 2702 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2703 FILE_UNUSE(fp, p); 2704 return (error); 2705 } 2706 2707 /* 2708 * Set the access and modification times given a path name; this 2709 * version does not follow links. 2710 */ 2711 /* ARGSUSED */ 2712 int 2713 sys_lutimes(struct lwp *l, void *v, register_t *retval) 2714 { 2715 struct sys_lutimes_args /* { 2716 syscallarg(const char *) path; 2717 syscallarg(const struct timeval *) tptr; 2718 } */ *uap = v; 2719 struct proc *p = l->l_proc; 2720 int error; 2721 struct nameidata nd; 2722 2723 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2724 if ((error = namei(&nd)) != 0) 2725 return (error); 2726 2727 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2728 2729 vrele(nd.ni_vp); 2730 return (error); 2731 } 2732 2733 /* 2734 * Common routine to set access and modification times given a vnode. 2735 */ 2736 static int 2737 change_utimes(struct vnode *vp, const struct timeval *tptr, struct proc *p) 2738 { 2739 struct timeval tv[2]; 2740 struct mount *mp; 2741 struct vattr vattr; 2742 int error; 2743 2744 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2745 return (error); 2746 VATTR_NULL(&vattr); 2747 if (tptr == NULL) { 2748 microtime(&tv[0]); 2749 tv[1] = tv[0]; 2750 vattr.va_vaflags |= VA_UTIMES_NULL; 2751 } else { 2752 error = copyin(tptr, tv, sizeof(tv)); 2753 if (error) 2754 goto out; 2755 } 2756 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2757 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2758 vattr.va_atime.tv_sec = tv[0].tv_sec; 2759 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2760 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2761 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2762 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2763 VOP_UNLOCK(vp, 0); 2764 out: 2765 vn_finished_write(mp, 0); 2766 return (error); 2767 } 2768 2769 /* 2770 * Truncate a file given its path name. 2771 */ 2772 /* ARGSUSED */ 2773 int 2774 sys_truncate(struct lwp *l, void *v, register_t *retval) 2775 { 2776 struct sys_truncate_args /* { 2777 syscallarg(const char *) path; 2778 syscallarg(int) pad; 2779 syscallarg(off_t) length; 2780 } */ *uap = v; 2781 struct proc *p = l->l_proc; 2782 struct vnode *vp; 2783 struct mount *mp; 2784 struct vattr vattr; 2785 int error; 2786 struct nameidata nd; 2787 2788 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2789 if ((error = namei(&nd)) != 0) 2790 return (error); 2791 vp = nd.ni_vp; 2792 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2793 vrele(vp); 2794 return (error); 2795 } 2796 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2797 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2798 if (vp->v_type == VDIR) 2799 error = EISDIR; 2800 else if ((error = vn_writechk(vp)) == 0 && 2801 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2802 VATTR_NULL(&vattr); 2803 vattr.va_size = SCARG(uap, length); 2804 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2805 } 2806 vput(vp); 2807 vn_finished_write(mp, 0); 2808 return (error); 2809 } 2810 2811 /* 2812 * Truncate a file given a file descriptor. 2813 */ 2814 /* ARGSUSED */ 2815 int 2816 sys_ftruncate(struct lwp *l, void *v, register_t *retval) 2817 { 2818 struct sys_ftruncate_args /* { 2819 syscallarg(int) fd; 2820 syscallarg(int) pad; 2821 syscallarg(off_t) length; 2822 } */ *uap = v; 2823 struct proc *p = l->l_proc; 2824 struct mount *mp; 2825 struct vattr vattr; 2826 struct vnode *vp; 2827 struct file *fp; 2828 int error; 2829 2830 /* getvnode() will use the descriptor for us */ 2831 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2832 return (error); 2833 if ((fp->f_flag & FWRITE) == 0) { 2834 error = EINVAL; 2835 goto out; 2836 } 2837 vp = (struct vnode *)fp->f_data; 2838 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2839 FILE_UNUSE(fp, p); 2840 return (error); 2841 } 2842 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2843 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2844 if (vp->v_type == VDIR) 2845 error = EISDIR; 2846 else if ((error = vn_writechk(vp)) == 0) { 2847 VATTR_NULL(&vattr); 2848 vattr.va_size = SCARG(uap, length); 2849 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2850 } 2851 VOP_UNLOCK(vp, 0); 2852 vn_finished_write(mp, 0); 2853 out: 2854 FILE_UNUSE(fp, p); 2855 return (error); 2856 } 2857 2858 /* 2859 * Sync an open file. 2860 */ 2861 /* ARGSUSED */ 2862 int 2863 sys_fsync(struct lwp *l, void *v, register_t *retval) 2864 { 2865 struct sys_fsync_args /* { 2866 syscallarg(int) fd; 2867 } */ *uap = v; 2868 struct proc *p = l->l_proc; 2869 struct vnode *vp; 2870 struct mount *mp; 2871 struct file *fp; 2872 int error; 2873 2874 /* getvnode() will use the descriptor for us */ 2875 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2876 return (error); 2877 vp = (struct vnode *)fp->f_data; 2878 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2879 FILE_UNUSE(fp, p); 2880 return (error); 2881 } 2882 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2883 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2884 if (error == 0 && bioops.io_fsync != NULL && 2885 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2886 (*bioops.io_fsync)(vp, 0); 2887 VOP_UNLOCK(vp, 0); 2888 vn_finished_write(mp, 0); 2889 FILE_UNUSE(fp, p); 2890 return (error); 2891 } 2892 2893 /* 2894 * Sync a range of file data. API modeled after that found in AIX. 2895 * 2896 * FDATASYNC indicates that we need only save enough metadata to be able 2897 * to re-read the written data. Note we duplicate AIX's requirement that 2898 * the file be open for writing. 2899 */ 2900 /* ARGSUSED */ 2901 int 2902 sys_fsync_range(struct lwp *l, void *v, register_t *retval) 2903 { 2904 struct sys_fsync_range_args /* { 2905 syscallarg(int) fd; 2906 syscallarg(int) flags; 2907 syscallarg(off_t) start; 2908 syscallarg(off_t) length; 2909 } */ *uap = v; 2910 struct proc *p = l->l_proc; 2911 struct vnode *vp; 2912 struct file *fp; 2913 int flags, nflags; 2914 off_t s, e, len; 2915 int error; 2916 2917 /* getvnode() will use the descriptor for us */ 2918 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2919 return (error); 2920 2921 if ((fp->f_flag & FWRITE) == 0) { 2922 FILE_UNUSE(fp, p); 2923 return (EBADF); 2924 } 2925 2926 flags = SCARG(uap, flags); 2927 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 2928 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 2929 return (EINVAL); 2930 } 2931 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 2932 if (flags & FDATASYNC) 2933 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 2934 else 2935 nflags = FSYNC_WAIT; 2936 if (flags & FDISKSYNC) 2937 nflags |= FSYNC_CACHE; 2938 2939 len = SCARG(uap, length); 2940 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 2941 if (len) { 2942 s = SCARG(uap, start); 2943 e = s + len; 2944 if (e < s) { 2945 FILE_UNUSE(fp, p); 2946 return (EINVAL); 2947 } 2948 } else { 2949 e = 0; 2950 s = 0; 2951 } 2952 2953 vp = (struct vnode *)fp->f_data; 2954 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2955 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, p); 2956 2957 if (error == 0 && bioops.io_fsync != NULL && 2958 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2959 (*bioops.io_fsync)(vp, nflags); 2960 2961 VOP_UNLOCK(vp, 0); 2962 FILE_UNUSE(fp, p); 2963 return (error); 2964 } 2965 2966 /* 2967 * Sync the data of an open file. 2968 */ 2969 /* ARGSUSED */ 2970 int 2971 sys_fdatasync(struct lwp *l, void *v, register_t *retval) 2972 { 2973 struct sys_fdatasync_args /* { 2974 syscallarg(int) fd; 2975 } */ *uap = v; 2976 struct proc *p = l->l_proc; 2977 struct vnode *vp; 2978 struct file *fp; 2979 int error; 2980 2981 /* getvnode() will use the descriptor for us */ 2982 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2983 return (error); 2984 if ((fp->f_flag & FWRITE) == 0) { 2985 FILE_UNUSE(fp, p); 2986 return (EBADF); 2987 } 2988 vp = (struct vnode *)fp->f_data; 2989 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2990 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2991 VOP_UNLOCK(vp, 0); 2992 FILE_UNUSE(fp, p); 2993 return (error); 2994 } 2995 2996 /* 2997 * Rename files, (standard) BSD semantics frontend. 2998 */ 2999 /* ARGSUSED */ 3000 int 3001 sys_rename(struct lwp *l, void *v, register_t *retval) 3002 { 3003 struct sys_rename_args /* { 3004 syscallarg(const char *) from; 3005 syscallarg(const char *) to; 3006 } */ *uap = v; 3007 struct proc *p = l->l_proc; 3008 3009 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 3010 } 3011 3012 /* 3013 * Rename files, POSIX semantics frontend. 3014 */ 3015 /* ARGSUSED */ 3016 int 3017 sys___posix_rename(struct lwp *l, void *v, register_t *retval) 3018 { 3019 struct sys___posix_rename_args /* { 3020 syscallarg(const char *) from; 3021 syscallarg(const char *) to; 3022 } */ *uap = v; 3023 struct proc *p = l->l_proc; 3024 3025 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 3026 } 3027 3028 /* 3029 * Rename files. Source and destination must either both be directories, 3030 * or both not be directories. If target is a directory, it must be empty. 3031 * If `from' and `to' refer to the same object, the value of the `retain' 3032 * argument is used to determine whether `from' will be 3033 * 3034 * (retain == 0) deleted unless `from' and `to' refer to the same 3035 * object in the file system's name space (BSD). 3036 * (retain == 1) always retained (POSIX). 3037 */ 3038 static int 3039 rename_files(const char *from, const char *to, struct proc *p, int retain) 3040 { 3041 struct mount *mp = NULL; 3042 struct vnode *tvp, *fvp, *tdvp; 3043 struct nameidata fromnd, tond; 3044 int error; 3045 3046 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 3047 from, p); 3048 if ((error = namei(&fromnd)) != 0) 3049 return (error); 3050 fvp = fromnd.ni_vp; 3051 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3052 if (error != 0) { 3053 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3054 vrele(fromnd.ni_dvp); 3055 vrele(fvp); 3056 if (fromnd.ni_startdir) 3057 vrele(fromnd.ni_startdir); 3058 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3059 return (error); 3060 } 3061 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3062 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p); 3063 if ((error = namei(&tond)) != 0) { 3064 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3065 vrele(fromnd.ni_dvp); 3066 vrele(fvp); 3067 goto out1; 3068 } 3069 tdvp = tond.ni_dvp; 3070 tvp = tond.ni_vp; 3071 3072 if (tvp != NULL) { 3073 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3074 error = ENOTDIR; 3075 goto out; 3076 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3077 error = EISDIR; 3078 goto out; 3079 } 3080 } 3081 3082 if (fvp == tdvp) 3083 error = EINVAL; 3084 3085 /* 3086 * Source and destination refer to the same object. 3087 */ 3088 if (fvp == tvp) { 3089 if (retain) 3090 error = -1; 3091 else if (fromnd.ni_dvp == tdvp && 3092 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3093 !memcmp(fromnd.ni_cnd.cn_nameptr, 3094 tond.ni_cnd.cn_nameptr, 3095 fromnd.ni_cnd.cn_namelen)) 3096 error = -1; 3097 } 3098 3099 out: 3100 if (!error) { 3101 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 3102 if (fromnd.ni_dvp != tdvp) 3103 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3104 if (tvp) { 3105 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3106 } 3107 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3108 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3109 } else { 3110 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3111 if (tdvp == tvp) 3112 vrele(tdvp); 3113 else 3114 vput(tdvp); 3115 if (tvp) 3116 vput(tvp); 3117 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3118 vrele(fromnd.ni_dvp); 3119 vrele(fvp); 3120 } 3121 vrele(tond.ni_startdir); 3122 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3123 out1: 3124 vn_finished_write(mp, 0); 3125 if (fromnd.ni_startdir) 3126 vrele(fromnd.ni_startdir); 3127 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3128 return (error == -1 ? 0 : error); 3129 } 3130 3131 /* 3132 * Make a directory file. 3133 */ 3134 /* ARGSUSED */ 3135 int 3136 sys_mkdir(struct lwp *l, void *v, register_t *retval) 3137 { 3138 struct sys_mkdir_args /* { 3139 syscallarg(const char *) path; 3140 syscallarg(int) mode; 3141 } */ *uap = v; 3142 struct proc *p = l->l_proc; 3143 struct mount *mp; 3144 struct vnode *vp; 3145 struct vattr vattr; 3146 int error; 3147 struct nameidata nd; 3148 3149 restart: 3150 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3151 SCARG(uap, path), p); 3152 if ((error = namei(&nd)) != 0) 3153 return (error); 3154 vp = nd.ni_vp; 3155 if (vp != NULL) { 3156 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3157 if (nd.ni_dvp == vp) 3158 vrele(nd.ni_dvp); 3159 else 3160 vput(nd.ni_dvp); 3161 vrele(vp); 3162 return (EEXIST); 3163 } 3164 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3165 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3166 if (nd.ni_dvp == vp) 3167 vrele(nd.ni_dvp); 3168 else 3169 vput(nd.ni_dvp); 3170 if ((error = vn_start_write(NULL, &mp, 3171 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3172 return (error); 3173 goto restart; 3174 } 3175 VATTR_NULL(&vattr); 3176 vattr.va_type = VDIR; 3177 vattr.va_mode = 3178 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3179 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3180 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3181 if (!error) 3182 vput(nd.ni_vp); 3183 vn_finished_write(mp, 0); 3184 return (error); 3185 } 3186 3187 /* 3188 * Remove a directory file. 3189 */ 3190 /* ARGSUSED */ 3191 int 3192 sys_rmdir(struct lwp *l, void *v, register_t *retval) 3193 { 3194 struct sys_rmdir_args /* { 3195 syscallarg(const char *) path; 3196 } */ *uap = v; 3197 struct proc *p = l->l_proc; 3198 struct mount *mp; 3199 struct vnode *vp; 3200 int error; 3201 struct nameidata nd; 3202 3203 restart: 3204 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3205 SCARG(uap, path), p); 3206 if ((error = namei(&nd)) != 0) 3207 return (error); 3208 vp = nd.ni_vp; 3209 if (vp->v_type != VDIR) { 3210 error = ENOTDIR; 3211 goto out; 3212 } 3213 /* 3214 * No rmdir "." please. 3215 */ 3216 if (nd.ni_dvp == vp) { 3217 error = EINVAL; 3218 goto out; 3219 } 3220 /* 3221 * The root of a mounted filesystem cannot be deleted. 3222 */ 3223 if (vp->v_flag & VROOT) { 3224 error = EBUSY; 3225 goto out; 3226 } 3227 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3228 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3229 if (nd.ni_dvp == vp) 3230 vrele(nd.ni_dvp); 3231 else 3232 vput(nd.ni_dvp); 3233 vput(vp); 3234 if ((error = vn_start_write(NULL, &mp, 3235 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3236 return (error); 3237 goto restart; 3238 } 3239 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3240 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3241 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3242 vn_finished_write(mp, 0); 3243 return (error); 3244 3245 out: 3246 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3247 if (nd.ni_dvp == vp) 3248 vrele(nd.ni_dvp); 3249 else 3250 vput(nd.ni_dvp); 3251 vput(vp); 3252 return (error); 3253 } 3254 3255 /* 3256 * Read a block of directory entries in a file system independent format. 3257 */ 3258 int 3259 sys_getdents(struct lwp *l, void *v, register_t *retval) 3260 { 3261 struct sys_getdents_args /* { 3262 syscallarg(int) fd; 3263 syscallarg(char *) buf; 3264 syscallarg(size_t) count; 3265 } */ *uap = v; 3266 struct proc *p = l->l_proc; 3267 struct file *fp; 3268 int error, done; 3269 3270 /* getvnode() will use the descriptor for us */ 3271 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3272 return (error); 3273 if ((fp->f_flag & FREAD) == 0) { 3274 error = EBADF; 3275 goto out; 3276 } 3277 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3278 SCARG(uap, count), &done, p, 0, 0); 3279 #ifdef KTRACE 3280 if (!error && KTRPOINT(p, KTR_GENIO)) { 3281 struct iovec iov; 3282 iov.iov_base = SCARG(uap, buf); 3283 iov.iov_len = done; 3284 ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3285 } 3286 #endif 3287 *retval = done; 3288 out: 3289 FILE_UNUSE(fp, p); 3290 return (error); 3291 } 3292 3293 /* 3294 * Set the mode mask for creation of filesystem nodes. 3295 */ 3296 int 3297 sys_umask(struct lwp *l, void *v, register_t *retval) 3298 { 3299 struct sys_umask_args /* { 3300 syscallarg(mode_t) newmask; 3301 } */ *uap = v; 3302 struct proc *p = l->l_proc; 3303 struct cwdinfo *cwdi; 3304 3305 cwdi = p->p_cwdi; 3306 *retval = cwdi->cwdi_cmask; 3307 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3308 return (0); 3309 } 3310 3311 /* 3312 * Void all references to file by ripping underlying filesystem 3313 * away from vnode. 3314 */ 3315 /* ARGSUSED */ 3316 int 3317 sys_revoke(struct lwp *l, void *v, register_t *retval) 3318 { 3319 struct sys_revoke_args /* { 3320 syscallarg(const char *) path; 3321 } */ *uap = v; 3322 struct proc *p = l->l_proc; 3323 struct mount *mp; 3324 struct vnode *vp; 3325 struct vattr vattr; 3326 int error; 3327 struct nameidata nd; 3328 3329 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3330 if ((error = namei(&nd)) != 0) 3331 return (error); 3332 vp = nd.ni_vp; 3333 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3334 goto out; 3335 if (p->p_ucred->cr_uid != vattr.va_uid && 3336 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3337 goto out; 3338 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3339 goto out; 3340 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3341 VOP_REVOKE(vp, REVOKEALL); 3342 vn_finished_write(mp, 0); 3343 out: 3344 vrele(vp); 3345 return (error); 3346 } 3347 3348 /* 3349 * Convert a user file descriptor to a kernel file entry. 3350 */ 3351 int 3352 getvnode(struct filedesc *fdp, int fd, struct file **fpp) 3353 { 3354 struct vnode *vp; 3355 struct file *fp; 3356 3357 if ((fp = fd_getfile(fdp, fd)) == NULL) 3358 return (EBADF); 3359 3360 FILE_USE(fp); 3361 3362 if (fp->f_type != DTYPE_VNODE) { 3363 FILE_UNUSE(fp, NULL); 3364 return (EINVAL); 3365 } 3366 3367 vp = (struct vnode *)fp->f_data; 3368 if (vp->v_type == VBAD) { 3369 FILE_UNUSE(fp, NULL); 3370 return (EBADF); 3371 } 3372 3373 *fpp = fp; 3374 return (0); 3375 } 3376
Indexes created Tue Sep 23 07:09:52 GMT 2025