vfs_syscalls.c revision 1.210
1 /* $NetBSD: vfs_syscalls.c,v 1.210 2004/07/01 10:03:30 hannken 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 1.210 2004/07/01 10:03:30 hannken Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_ktrace.h" 45 #include "fss.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/filedesc.h> 51 #include <sys/kernel.h> 52 #include <sys/file.h> 53 #include <sys/stat.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/proc.h> 57 #include <sys/uio.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 #include <sys/sysctl.h> 61 #include <sys/sa.h> 62 #include <sys/syscallargs.h> 63 #ifdef KTRACE 64 #include <sys/ktrace.h> 65 #endif 66 67 #include <miscfs/genfs/genfs.h> 68 #include <miscfs/syncfs/syncfs.h> 69 70 #if NFSS > 0 71 #include <dev/fssvar.h> 72 #endif 73 74 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 75 76 static int change_dir(struct nameidata *, struct proc *); 77 static int change_flags(struct vnode *, u_long, struct proc *); 78 static int change_mode(struct vnode *, int, struct proc *p); 79 static int change_owner(struct vnode *, uid_t, gid_t, struct proc *, int); 80 static int change_utimes(struct vnode *vp, const struct timeval *, 81 struct proc *p); 82 static int rename_files(const char *, const char *, struct proc *, int); 83 84 void checkdirs(struct vnode *); 85 86 int dovfsusermount = 0; 87 88 /* 89 * Virtual File System System Calls 90 */ 91 92 /* 93 * Mount a file system. 94 */ 95 96 #if defined(COMPAT_09) || defined(COMPAT_43) 97 /* 98 * This table is used to maintain compatibility with 4.3BSD 99 * and NetBSD 0.9 mount syscalls. Note, the order is important! 100 * 101 * Do not modify this table. It should only contain filesystems 102 * supported by NetBSD 0.9 and 4.3BSD. 103 */ 104 const char * const mountcompatnames[] = { 105 NULL, /* 0 = MOUNT_NONE */ 106 MOUNT_FFS, /* 1 = MOUNT_UFS */ 107 MOUNT_NFS, /* 2 */ 108 MOUNT_MFS, /* 3 */ 109 MOUNT_MSDOS, /* 4 */ 110 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 111 MOUNT_FDESC, /* 6 */ 112 MOUNT_KERNFS, /* 7 */ 113 NULL, /* 8 = MOUNT_DEVFS */ 114 MOUNT_AFS, /* 9 */ 115 }; 116 const int nmountcompatnames = sizeof(mountcompatnames) / 117 sizeof(mountcompatnames[0]); 118 #endif /* COMPAT_09 || COMPAT_43 */ 119 120 /* ARGSUSED */ 121 int 122 sys_mount(l, v, retval) 123 struct lwp *l; 124 void *v; 125 register_t *retval; 126 { 127 struct sys_mount_args /* { 128 syscallarg(const char *) type; 129 syscallarg(const char *) path; 130 syscallarg(int) flags; 131 syscallarg(void *) data; 132 } */ *uap = v; 133 struct proc *p = l->l_proc; 134 struct vnode *vp; 135 struct mount *mp; 136 int error, flag = 0; 137 char fstypename[MFSNAMELEN]; 138 struct vattr va; 139 struct nameidata nd; 140 struct vfsops *vfs; 141 142 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 143 (error = suser(p->p_ucred, &p->p_acflag))) 144 return (error); 145 /* 146 * Get vnode to be covered 147 */ 148 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 149 SCARG(uap, path), p); 150 if ((error = namei(&nd)) != 0) 151 return (error); 152 vp = nd.ni_vp; 153 /* 154 * A lookup in VFS_MOUNT might result in an attempt to 155 * lock this vnode again, so make the lock recursive. 156 */ 157 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 158 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 159 if ((vp->v_flag & VROOT) == 0) { 160 vput(vp); 161 return (EINVAL); 162 } 163 mp = vp->v_mount; 164 flag = mp->mnt_flag; 165 vfs = mp->mnt_op; 166 /* 167 * We only allow the filesystem to be reloaded if it 168 * is currently mounted read-only. 169 */ 170 if ((SCARG(uap, flags) & MNT_RELOAD) && 171 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 172 vput(vp); 173 return (EOPNOTSUPP); /* Needs translation */ 174 } 175 /* 176 * In "highly secure" mode, don't let the caller do anything 177 * but downgrade a filesystem from read-write to read-only. 178 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 179 */ 180 if (securelevel >= 2 && 181 SCARG(uap, flags) != MNT_GETARGS && 182 SCARG(uap, flags) != 183 (mp->mnt_flag | MNT_RDONLY | 184 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 185 vput(vp); 186 return (EPERM); 187 } 188 mp->mnt_flag |= SCARG(uap, flags) & 189 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 190 /* 191 * Only root, or the user that did the original mount is 192 * permitted to update it. 193 */ 194 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 195 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 196 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 197 vput(vp); 198 return (error); 199 } 200 /* 201 * Do not allow NFS export by non-root users. For non-root 202 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 203 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 204 */ 205 if (p->p_ucred->cr_uid != 0) { 206 if (SCARG(uap, flags) & MNT_EXPORTED) { 207 vput(vp); 208 return (EPERM); 209 } 210 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 211 if (flag & MNT_NOEXEC) 212 SCARG(uap, flags) |= MNT_NOEXEC; 213 } 214 if (vfs_busy(mp, LK_NOWAIT, 0)) { 215 vput(vp); 216 return (EPERM); 217 } 218 goto update; 219 } else { 220 if (securelevel >= 2) { 221 vput(vp); 222 return (EPERM); 223 } 224 } 225 /* 226 * If the user is not root, ensure that they own the directory 227 * onto which we are attempting to mount. 228 */ 229 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 230 (va.va_uid != p->p_ucred->cr_uid && 231 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 232 vput(vp); 233 return (error); 234 } 235 /* 236 * Do not allow NFS export by non-root users. For non-root users, 237 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 238 * mount point is already MNT_NOEXEC. 239 */ 240 if (p->p_ucred->cr_uid != 0) { 241 if (SCARG(uap, flags) & MNT_EXPORTED) { 242 vput(vp); 243 return (EPERM); 244 } 245 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 246 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 247 SCARG(uap, flags) |= MNT_NOEXEC; 248 } 249 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) { 250 vput(vp); 251 return (error); 252 } 253 if (vp->v_type != VDIR) { 254 vput(vp); 255 return (ENOTDIR); 256 } 257 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 258 if (error) { 259 #if defined(COMPAT_09) || defined(COMPAT_43) 260 /* 261 * Historically filesystem types were identified by number. 262 * If we get an integer for the filesystem type instead of a 263 * string, we check to see if it matches one of the historic 264 * filesystem types. 265 */ 266 u_long fsindex = (u_long)SCARG(uap, type); 267 if (fsindex >= nmountcompatnames || 268 mountcompatnames[fsindex] == NULL) { 269 vput(vp); 270 return (ENODEV); 271 } 272 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 273 #else 274 vput(vp); 275 return (error); 276 #endif 277 } 278 #ifdef COMPAT_10 279 /* Accept `ufs' as an alias for `ffs'. */ 280 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 281 strncpy(fstypename, "ffs", MFSNAMELEN); 282 #endif 283 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 284 vput(vp); 285 return (ENODEV); 286 } 287 if (vp->v_mountedhere != NULL) { 288 vput(vp); 289 return (EBUSY); 290 } 291 292 /* 293 * Allocate and initialize the file system. 294 */ 295 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 296 M_MOUNT, M_WAITOK); 297 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 298 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 299 simple_lock_init(&mp->mnt_slock); 300 (void)vfs_busy(mp, LK_NOWAIT, 0); 301 mp->mnt_op = vfs; 302 vfs->vfs_refcount++; 303 mp->mnt_vnodecovered = vp; 304 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 305 mp->mnt_unmounter = NULL; 306 mp->mnt_leaf = mp; 307 308 /* 309 * The underlying file system may refuse the mount for 310 * various reasons. Allow the user to force it to happen. 311 */ 312 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 313 update: 314 /* 315 * Set the mount level flags. 316 */ 317 if (SCARG(uap, flags) & MNT_RDONLY) 318 mp->mnt_flag |= MNT_RDONLY; 319 else if (mp->mnt_flag & MNT_RDONLY) 320 mp->mnt_iflag |= IMNT_WANTRDWR; 321 mp->mnt_flag &= 322 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 323 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 324 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 325 mp->mnt_flag |= SCARG(uap, flags) & 326 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 327 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 328 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 329 MNT_IGNORE); 330 /* 331 * Mount the filesystem. 332 */ 333 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 334 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 335 if (mp->mnt_iflag & IMNT_WANTRDWR) 336 mp->mnt_flag &= ~MNT_RDONLY; 337 if (error || (mp->mnt_flag & MNT_GETARGS)) 338 mp->mnt_flag = flag; 339 mp->mnt_flag &=~ 340 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 341 mp->mnt_iflag &=~ IMNT_WANTRDWR; 342 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 343 if (mp->mnt_syncer == NULL) 344 error = vfs_allocate_syncvnode(mp); 345 } else { 346 if (mp->mnt_syncer != NULL) 347 vfs_deallocate_syncvnode(mp); 348 } 349 vfs_unbusy(mp); 350 VOP_UNLOCK(vp, 0); 351 vrele(vp); 352 return (error); 353 } 354 /* 355 * Put the new filesystem on the mount list after root. 356 */ 357 cache_purge(vp); 358 if (!error) { 359 mp->mnt_flag &=~ 360 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 361 mp->mnt_iflag &=~ IMNT_WANTRDWR; 362 vp->v_mountedhere = mp; 363 simple_lock(&mountlist_slock); 364 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 365 simple_unlock(&mountlist_slock); 366 checkdirs(vp); 367 VOP_UNLOCK(vp, 0); 368 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 369 error = vfs_allocate_syncvnode(mp); 370 vfs_unbusy(mp); 371 (void) VFS_STATVFS(mp, &mp->mnt_stat, p); 372 if ((error = VFS_START(mp, 0, p))) 373 vrele(vp); 374 } else { 375 vp->v_mountedhere = (struct mount *)0; 376 vfs->vfs_refcount--; 377 vfs_unbusy(mp); 378 free(mp, M_MOUNT); 379 vput(vp); 380 } 381 return (error); 382 } 383 384 /* 385 * Scan all active processes to see if any of them have a current 386 * or root directory onto which the new filesystem has just been 387 * mounted. If so, replace them with the new mount point. 388 */ 389 void 390 checkdirs(olddp) 391 struct vnode *olddp; 392 { 393 struct cwdinfo *cwdi; 394 struct vnode *newdp; 395 struct proc *p; 396 397 if (olddp->v_usecount == 1) 398 return; 399 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 400 panic("mount: lost mount"); 401 proclist_lock_read(); 402 LIST_FOREACH(p, &allproc, p_list) { 403 cwdi = p->p_cwdi; 404 if (cwdi->cwdi_cdir == olddp) { 405 vrele(cwdi->cwdi_cdir); 406 VREF(newdp); 407 cwdi->cwdi_cdir = newdp; 408 } 409 if (cwdi->cwdi_rdir == olddp) { 410 vrele(cwdi->cwdi_rdir); 411 VREF(newdp); 412 cwdi->cwdi_rdir = newdp; 413 } 414 } 415 proclist_unlock_read(); 416 if (rootvnode == olddp) { 417 vrele(rootvnode); 418 VREF(newdp); 419 rootvnode = newdp; 420 } 421 vput(newdp); 422 } 423 424 /* 425 * Unmount a file system. 426 * 427 * Note: unmount takes a path to the vnode mounted on as argument, 428 * not special file (as before). 429 */ 430 /* ARGSUSED */ 431 int 432 sys_unmount(l, v, retval) 433 struct lwp *l; 434 void *v; 435 register_t *retval; 436 { 437 struct sys_unmount_args /* { 438 syscallarg(const char *) path; 439 syscallarg(int) flags; 440 } */ *uap = v; 441 struct proc *p = l->l_proc; 442 struct vnode *vp; 443 struct mount *mp; 444 int error; 445 struct nameidata nd; 446 447 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 448 SCARG(uap, path), p); 449 if ((error = namei(&nd)) != 0) 450 return (error); 451 vp = nd.ni_vp; 452 mp = vp->v_mount; 453 454 /* 455 * Only root, or the user that did the original mount is 456 * permitted to unmount this filesystem. 457 */ 458 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 459 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 460 vput(vp); 461 return (error); 462 } 463 464 /* 465 * Don't allow unmounting the root file system. 466 */ 467 if (mp->mnt_flag & MNT_ROOTFS) { 468 vput(vp); 469 return (EINVAL); 470 } 471 472 /* 473 * Must be the root of the filesystem 474 */ 475 if ((vp->v_flag & VROOT) == 0) { 476 vput(vp); 477 return (EINVAL); 478 } 479 vput(vp); 480 481 /* 482 * XXX Freeze syncer. Must do this before locking the 483 * mount point. See dounmount() for details. 484 */ 485 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 486 487 if (vfs_busy(mp, 0, 0)) { 488 lockmgr(&syncer_lock, LK_RELEASE, NULL); 489 return (EBUSY); 490 } 491 492 return (dounmount(mp, SCARG(uap, flags), p)); 493 } 494 495 /* 496 * Do the actual file system unmount. File system is assumed to have been 497 * marked busy by the caller. 498 */ 499 int 500 dounmount(mp, flags, p) 501 struct mount *mp; 502 int flags; 503 struct proc *p; 504 { 505 struct vnode *coveredvp; 506 int error; 507 int async; 508 int used_syncer; 509 510 simple_lock(&mountlist_slock); 511 vfs_unbusy(mp); 512 used_syncer = (mp->mnt_syncer != NULL); 513 514 /* 515 * XXX Syncer must be frozen when we get here. This should really 516 * be done on a per-mountpoint basis, but especially the softdep 517 * code possibly called from the syncer doens't exactly work on a 518 * per-mountpoint basis, so the softdep code would become a maze 519 * of vfs_busy() calls. 520 * 521 * The caller of dounmount() must acquire syncer_lock because 522 * the syncer itself acquires locks in syncer_lock -> vfs_busy 523 * order, and we must preserve that order to avoid deadlock. 524 * 525 * So, if the file system did not use the syncer, now is 526 * the time to release the syncer_lock. 527 */ 528 if (used_syncer == 0) 529 lockmgr(&syncer_lock, LK_RELEASE, NULL); 530 531 mp->mnt_iflag |= IMNT_UNMOUNT; 532 mp->mnt_unmounter = p; 533 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 534 vn_start_write(NULL, &mp, V_WAIT); 535 536 if (mp->mnt_flag & MNT_EXPUBLIC) 537 vfs_setpublicfs(NULL, NULL, NULL); 538 async = mp->mnt_flag & MNT_ASYNC; 539 mp->mnt_flag &= ~MNT_ASYNC; 540 cache_purgevfs(mp); /* remove cache entries for this file sys */ 541 if (mp->mnt_syncer != NULL) 542 vfs_deallocate_syncvnode(mp); 543 error = 0; 544 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 545 #if NFSS > 0 546 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 547 #endif 548 if (error == 0) 549 error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p); 550 } 551 if (error == 0 || (flags & MNT_FORCE)) 552 error = VFS_UNMOUNT(mp, flags, p); 553 vn_finished_write(mp, 0); 554 simple_lock(&mountlist_slock); 555 if (error) { 556 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 557 (void) vfs_allocate_syncvnode(mp); 558 mp->mnt_iflag &= ~IMNT_UNMOUNT; 559 mp->mnt_unmounter = NULL; 560 mp->mnt_flag |= async; 561 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 562 &mountlist_slock); 563 if (used_syncer) 564 lockmgr(&syncer_lock, LK_RELEASE, NULL); 565 simple_lock(&mp->mnt_slock); 566 while (mp->mnt_wcnt > 0) { 567 wakeup(mp); 568 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 569 0, &mp->mnt_slock); 570 } 571 simple_unlock(&mp->mnt_slock); 572 return (error); 573 } 574 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 575 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 576 coveredvp->v_mountedhere = NULL; 577 vrele(coveredvp); 578 } 579 mp->mnt_op->vfs_refcount--; 580 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 581 panic("unmount: dangling vnode"); 582 mp->mnt_iflag |= IMNT_GONE; 583 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 584 if (used_syncer) 585 lockmgr(&syncer_lock, LK_RELEASE, NULL); 586 simple_lock(&mp->mnt_slock); 587 while (mp->mnt_wcnt > 0) { 588 wakeup(mp); 589 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 590 } 591 simple_unlock(&mp->mnt_slock); 592 free(mp, M_MOUNT); 593 return (0); 594 } 595 596 /* 597 * Sync each mounted filesystem. 598 */ 599 #ifdef DEBUG 600 int syncprt = 0; 601 struct ctldebug debug0 = { "syncprt", &syncprt }; 602 #endif 603 604 /* ARGSUSED */ 605 int 606 sys_sync(l, v, retval) 607 struct lwp *l; 608 void *v; 609 register_t *retval; 610 { 611 struct mount *mp, *nmp; 612 int asyncflag; 613 struct proc *p = l == NULL ? &proc0 : l->l_proc; 614 615 simple_lock(&mountlist_slock); 616 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 617 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 618 nmp = mp->mnt_list.cqe_prev; 619 continue; 620 } 621 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 622 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 623 asyncflag = mp->mnt_flag & MNT_ASYNC; 624 mp->mnt_flag &= ~MNT_ASYNC; 625 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 626 if (asyncflag) 627 mp->mnt_flag |= MNT_ASYNC; 628 vn_finished_write(mp, 0); 629 } 630 simple_lock(&mountlist_slock); 631 nmp = mp->mnt_list.cqe_prev; 632 vfs_unbusy(mp); 633 634 } 635 simple_unlock(&mountlist_slock); 636 #ifdef DEBUG 637 if (syncprt) 638 vfs_bufstats(); 639 #endif /* DEBUG */ 640 return (0); 641 } 642 643 /* 644 * Change filesystem quotas. 645 */ 646 /* ARGSUSED */ 647 int 648 sys_quotactl(l, v, retval) 649 struct lwp *l; 650 void *v; 651 register_t *retval; 652 { 653 struct sys_quotactl_args /* { 654 syscallarg(const char *) path; 655 syscallarg(int) cmd; 656 syscallarg(int) uid; 657 syscallarg(caddr_t) arg; 658 } */ *uap = v; 659 struct proc *p = l->l_proc; 660 struct mount *mp; 661 int error; 662 struct nameidata nd; 663 664 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 665 if ((error = namei(&nd)) != 0) 666 return (error); 667 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 668 vrele(nd.ni_vp); 669 if (error) 670 return (error); 671 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 672 SCARG(uap, arg), p); 673 vn_finished_write(mp, 0); 674 return (error); 675 } 676 677 int 678 dostatvfs(struct mount *mp, struct statvfs *sp, struct proc *p, int flags, 679 int root) 680 { 681 struct cwdinfo *cwdi = p->p_cwdi; 682 int error = 0; 683 684 /* 685 * If MNT_NOWAIT or MNT_LAZY is specified, do not 686 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 687 * overrides MNT_NOWAIT. 688 */ 689 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 690 (flags != MNT_WAIT && flags != 0)) { 691 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 692 goto done; 693 } 694 695 if ((error = VFS_STATVFS(mp, sp, p)) != 0) { 696 return error; 697 } 698 699 if (cwdi->cwdi_rdir == NULL) 700 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 701 done: 702 if (cwdi->cwdi_rdir != NULL) { 703 size_t len; 704 char *bp; 705 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 706 if (!path) 707 return ENOMEM; 708 709 bp = path + MAXPATHLEN; 710 *--bp = '\0'; 711 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 712 MAXPATHLEN / 2, 0, p); 713 if (error) { 714 free(path, M_TEMP); 715 return error; 716 } 717 len = strlen(bp); 718 /* 719 * for mount points that are below our root, we can see 720 * them, so we fix up the pathname and return them. The 721 * rest we cannot see, so we don't allow viewing the 722 * data. 723 */ 724 if (strncmp(bp, sp->f_mntonname, len) == 0) { 725 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 726 sizeof(sp->f_mntonname)); 727 if (sp->f_mntonname[0] == '\0') 728 (void)strlcpy(sp->f_mntonname, "/", 729 sizeof(sp->f_mntonname)); 730 } else { 731 if (root) 732 (void)strlcpy(sp->f_mntonname, "/", 733 sizeof(sp->f_mntonname)); 734 else 735 error = EPERM; 736 } 737 free(path, M_TEMP); 738 } 739 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 740 return error; 741 } 742 743 /* 744 * Get filesystem statistics. 745 */ 746 /* ARGSUSED */ 747 int 748 sys_statvfs1(l, v, retval) 749 struct lwp *l; 750 void *v; 751 register_t *retval; 752 { 753 struct sys_statvfs1_args /* { 754 syscallarg(const char *) path; 755 syscallarg(struct statvfs *) buf; 756 syscallarg(int) flags; 757 } */ *uap = v; 758 struct proc *p = l->l_proc; 759 struct mount *mp; 760 struct statvfs sbuf; 761 int error; 762 struct nameidata nd; 763 764 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 765 if ((error = namei(&nd)) != 0) 766 return error; 767 mp = nd.ni_vp->v_mount; 768 vrele(nd.ni_vp); 769 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 770 return error; 771 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 772 } 773 774 /* 775 * Get filesystem statistics. 776 */ 777 /* ARGSUSED */ 778 int 779 sys_fstatvfs1(l, v, retval) 780 struct lwp *l; 781 void *v; 782 register_t *retval; 783 { 784 struct sys_fstatvfs1_args /* { 785 syscallarg(int) fd; 786 syscallarg(struct statvfs *) buf; 787 syscallarg(int) flags; 788 } */ *uap = v; 789 struct proc *p = l->l_proc; 790 struct file *fp; 791 struct mount *mp; 792 struct statvfs sbuf; 793 int error; 794 795 /* getvnode() will use the descriptor for us */ 796 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 797 return (error); 798 mp = ((struct vnode *)fp->f_data)->v_mount; 799 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) 800 goto out; 801 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 802 out: 803 FILE_UNUSE(fp, p); 804 return error; 805 } 806 807 808 /* 809 * Get statistics on all filesystems. 810 */ 811 int 812 sys_getvfsstat(l, v, retval) 813 struct lwp *l; 814 void *v; 815 register_t *retval; 816 { 817 struct sys_getvfsstat_args /* { 818 syscallarg(struct statvfs *) buf; 819 syscallarg(size_t) bufsize; 820 syscallarg(int) flags; 821 } */ *uap = v; 822 int root = 0; 823 struct proc *p = l->l_proc; 824 struct mount *mp, *nmp; 825 struct statvfs sbuf; 826 struct statvfs *sfsp; 827 size_t count, maxcount; 828 int error = 0; 829 830 maxcount = SCARG(uap, bufsize) / sizeof(struct statvfs); 831 sfsp = SCARG(uap, buf); 832 simple_lock(&mountlist_slock); 833 count = 0; 834 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 835 mp = nmp) { 836 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 837 nmp = CIRCLEQ_NEXT(mp, mnt_list); 838 continue; 839 } 840 if (sfsp && count < maxcount) { 841 error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 0); 842 if (error) { 843 simple_lock(&mountlist_slock); 844 nmp = CIRCLEQ_NEXT(mp, mnt_list); 845 vfs_unbusy(mp); 846 continue; 847 } 848 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 849 if (error) { 850 vfs_unbusy(mp); 851 return (error); 852 } 853 sfsp++; 854 root |= strcmp(sbuf.f_mntonname, "/") == 0; 855 } 856 count++; 857 simple_lock(&mountlist_slock); 858 nmp = CIRCLEQ_NEXT(mp, mnt_list); 859 vfs_unbusy(mp); 860 } 861 simple_unlock(&mountlist_slock); 862 if (root == 0 && p->p_cwdi->cwdi_rdir) { 863 /* 864 * fake a root entry 865 */ 866 if ((error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 867 SCARG(uap, flags), 1)) != 0) 868 return error; 869 if (sfsp) 870 error = copyout(&sbuf, sfsp, sizeof(*sfsp)); 871 count++; 872 } 873 if (sfsp && count > maxcount) 874 *retval = maxcount; 875 else 876 *retval = count; 877 return error; 878 } 879 880 /* 881 * Change current working directory to a given file descriptor. 882 */ 883 /* ARGSUSED */ 884 int 885 sys_fchdir(l, v, retval) 886 struct lwp *l; 887 void *v; 888 register_t *retval; 889 { 890 struct sys_fchdir_args /* { 891 syscallarg(int) fd; 892 } */ *uap = v; 893 struct proc *p = l->l_proc; 894 struct filedesc *fdp = p->p_fd; 895 struct cwdinfo *cwdi = p->p_cwdi; 896 struct vnode *vp, *tdp; 897 struct mount *mp; 898 struct file *fp; 899 int error; 900 901 /* getvnode() will use the descriptor for us */ 902 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 903 return (error); 904 vp = (struct vnode *)fp->f_data; 905 906 VREF(vp); 907 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 908 if (vp->v_type != VDIR) 909 error = ENOTDIR; 910 else 911 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 912 while (!error && (mp = vp->v_mountedhere) != NULL) { 913 if (vfs_busy(mp, 0, 0)) 914 continue; 915 error = VFS_ROOT(mp, &tdp); 916 vfs_unbusy(mp); 917 if (error) 918 break; 919 vput(vp); 920 vp = tdp; 921 } 922 if (error) { 923 vput(vp); 924 goto out; 925 } 926 VOP_UNLOCK(vp, 0); 927 928 /* 929 * Disallow changing to a directory not under the process's 930 * current root directory (if there is one). 931 */ 932 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 933 vrele(vp); 934 error = EPERM; /* operation not permitted */ 935 goto out; 936 } 937 938 vrele(cwdi->cwdi_cdir); 939 cwdi->cwdi_cdir = vp; 940 out: 941 FILE_UNUSE(fp, p); 942 return (error); 943 } 944 945 /* 946 * Change this process's notion of the root directory to a given file descriptor. 947 */ 948 949 int 950 sys_fchroot(l, v, retval) 951 struct lwp *l; 952 void *v; 953 register_t *retval; 954 { 955 struct sys_fchroot_args *uap = v; 956 struct proc *p = l->l_proc; 957 struct filedesc *fdp = p->p_fd; 958 struct cwdinfo *cwdi = p->p_cwdi; 959 struct vnode *vp; 960 struct file *fp; 961 int error; 962 963 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 964 return error; 965 /* getvnode() will use the descriptor for us */ 966 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 967 return error; 968 vp = (struct vnode *) fp->f_data; 969 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 970 if (vp->v_type != VDIR) 971 error = ENOTDIR; 972 else 973 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 974 VOP_UNLOCK(vp, 0); 975 if (error) 976 goto out; 977 VREF(vp); 978 979 /* 980 * Prevent escaping from chroot by putting the root under 981 * the working directory. Silently chdir to / if we aren't 982 * already there. 983 */ 984 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 985 /* 986 * XXX would be more failsafe to change directory to a 987 * deadfs node here instead 988 */ 989 vrele(cwdi->cwdi_cdir); 990 VREF(vp); 991 cwdi->cwdi_cdir = vp; 992 } 993 994 if (cwdi->cwdi_rdir != NULL) 995 vrele(cwdi->cwdi_rdir); 996 cwdi->cwdi_rdir = vp; 997 out: 998 FILE_UNUSE(fp, p); 999 return (error); 1000 } 1001 1002 1003 1004 /* 1005 * Change current working directory (``.''). 1006 */ 1007 /* ARGSUSED */ 1008 int 1009 sys_chdir(l, v, retval) 1010 struct lwp *l; 1011 void *v; 1012 register_t *retval; 1013 { 1014 struct sys_chdir_args /* { 1015 syscallarg(const char *) path; 1016 } */ *uap = v; 1017 struct proc *p = l->l_proc; 1018 struct cwdinfo *cwdi = p->p_cwdi; 1019 int error; 1020 struct nameidata nd; 1021 1022 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1023 SCARG(uap, path), p); 1024 if ((error = change_dir(&nd, p)) != 0) 1025 return (error); 1026 vrele(cwdi->cwdi_cdir); 1027 cwdi->cwdi_cdir = nd.ni_vp; 1028 return (0); 1029 } 1030 1031 /* 1032 * Change notion of root (``/'') directory. 1033 */ 1034 /* ARGSUSED */ 1035 int 1036 sys_chroot(l, v, retval) 1037 struct lwp *l; 1038 void *v; 1039 register_t *retval; 1040 { 1041 struct sys_chroot_args /* { 1042 syscallarg(const char *) path; 1043 } */ *uap = v; 1044 struct proc *p = l->l_proc; 1045 struct cwdinfo *cwdi = p->p_cwdi; 1046 struct vnode *vp; 1047 int error; 1048 struct nameidata nd; 1049 1050 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1051 return (error); 1052 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1053 SCARG(uap, path), p); 1054 if ((error = change_dir(&nd, p)) != 0) 1055 return (error); 1056 if (cwdi->cwdi_rdir != NULL) 1057 vrele(cwdi->cwdi_rdir); 1058 vp = nd.ni_vp; 1059 cwdi->cwdi_rdir = vp; 1060 1061 /* 1062 * Prevent escaping from chroot by putting the root under 1063 * the working directory. Silently chdir to / if we aren't 1064 * already there. 1065 */ 1066 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1067 /* 1068 * XXX would be more failsafe to change directory to a 1069 * deadfs node here instead 1070 */ 1071 vrele(cwdi->cwdi_cdir); 1072 VREF(vp); 1073 cwdi->cwdi_cdir = vp; 1074 } 1075 1076 return (0); 1077 } 1078 1079 /* 1080 * Common routine for chroot and chdir. 1081 */ 1082 static int 1083 change_dir(ndp, p) 1084 struct nameidata *ndp; 1085 struct proc *p; 1086 { 1087 struct vnode *vp; 1088 int error; 1089 1090 if ((error = namei(ndp)) != 0) 1091 return (error); 1092 vp = ndp->ni_vp; 1093 if (vp->v_type != VDIR) 1094 error = ENOTDIR; 1095 else 1096 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1097 1098 if (error) 1099 vput(vp); 1100 else 1101 VOP_UNLOCK(vp, 0); 1102 return (error); 1103 } 1104 1105 /* 1106 * Check permissions, allocate an open file structure, 1107 * and call the device open routine if any. 1108 */ 1109 int 1110 sys_open(l, v, retval) 1111 struct lwp *l; 1112 void *v; 1113 register_t *retval; 1114 { 1115 struct sys_open_args /* { 1116 syscallarg(const char *) path; 1117 syscallarg(int) flags; 1118 syscallarg(int) mode; 1119 } */ *uap = v; 1120 struct proc *p = l->l_proc; 1121 struct cwdinfo *cwdi = p->p_cwdi; 1122 struct filedesc *fdp = p->p_fd; 1123 struct file *fp; 1124 struct vnode *vp; 1125 int flags, cmode; 1126 int type, indx, error; 1127 struct flock lf; 1128 struct nameidata nd; 1129 1130 flags = FFLAGS(SCARG(uap, flags)); 1131 if ((flags & (FREAD | FWRITE)) == 0) 1132 return (EINVAL); 1133 /* falloc() will use the file descriptor for us */ 1134 if ((error = falloc(p, &fp, &indx)) != 0) 1135 return (error); 1136 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1137 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1138 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1139 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1140 FILE_UNUSE(fp, p); 1141 fdp->fd_ofiles[indx] = NULL; 1142 ffree(fp); 1143 if ((error == ENODEV || error == ENXIO) && 1144 l->l_dupfd >= 0 && /* XXX from fdopen */ 1145 (error = 1146 dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) { 1147 *retval = indx; 1148 return (0); 1149 } 1150 if (error == ERESTART) 1151 error = EINTR; 1152 fdremove(fdp, indx); 1153 return (error); 1154 } 1155 l->l_dupfd = 0; 1156 vp = nd.ni_vp; 1157 fp->f_flag = flags & FMASK; 1158 fp->f_type = DTYPE_VNODE; 1159 fp->f_ops = &vnops; 1160 fp->f_data = vp; 1161 if (flags & (O_EXLOCK | O_SHLOCK)) { 1162 lf.l_whence = SEEK_SET; 1163 lf.l_start = 0; 1164 lf.l_len = 0; 1165 if (flags & O_EXLOCK) 1166 lf.l_type = F_WRLCK; 1167 else 1168 lf.l_type = F_RDLCK; 1169 type = F_FLOCK; 1170 if ((flags & FNONBLOCK) == 0) 1171 type |= F_WAIT; 1172 VOP_UNLOCK(vp, 0); 1173 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1174 if (error) { 1175 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1176 FILE_UNUSE(fp, p); 1177 ffree(fp); 1178 fdremove(fdp, indx); 1179 return (error); 1180 } 1181 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1182 fp->f_flag |= FHASLOCK; 1183 } 1184 VOP_UNLOCK(vp, 0); 1185 *retval = indx; 1186 FILE_SET_MATURE(fp); 1187 FILE_UNUSE(fp, p); 1188 return (0); 1189 } 1190 1191 /* 1192 * Get file handle system call 1193 */ 1194 int 1195 sys_getfh(l, v, retval) 1196 struct lwp *l; 1197 void *v; 1198 register_t *retval; 1199 { 1200 struct sys_getfh_args /* { 1201 syscallarg(char *) fname; 1202 syscallarg(fhandle_t *) fhp; 1203 } */ *uap = v; 1204 struct proc *p = l->l_proc; 1205 struct vnode *vp; 1206 fhandle_t fh; 1207 int error; 1208 struct nameidata nd; 1209 1210 /* 1211 * Must be super user 1212 */ 1213 error = suser(p->p_ucred, &p->p_acflag); 1214 if (error) 1215 return (error); 1216 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1217 SCARG(uap, fname), p); 1218 error = namei(&nd); 1219 if (error) 1220 return (error); 1221 vp = nd.ni_vp; 1222 memset(&fh, 0, sizeof(fh)); 1223 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsidx; 1224 error = VFS_VPTOFH(vp, &fh.fh_fid); 1225 vput(vp); 1226 if (error) 1227 return (error); 1228 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1229 return (error); 1230 } 1231 1232 /* 1233 * Open a file given a file handle. 1234 * 1235 * Check permissions, allocate an open file structure, 1236 * and call the device open routine if any. 1237 */ 1238 int 1239 sys_fhopen(l, v, retval) 1240 struct lwp *l; 1241 void *v; 1242 register_t *retval; 1243 { 1244 struct sys_fhopen_args /* { 1245 syscallarg(const fhandle_t *) fhp; 1246 syscallarg(int) flags; 1247 } */ *uap = v; 1248 struct proc *p = l->l_proc; 1249 struct filedesc *fdp = p->p_fd; 1250 struct file *fp; 1251 struct vnode *vp = NULL; 1252 struct mount *mp; 1253 struct ucred *cred = p->p_ucred; 1254 int flags; 1255 struct file *nfp; 1256 int type, indx, error=0; 1257 struct flock lf; 1258 struct vattr va; 1259 fhandle_t fh; 1260 1261 /* 1262 * Must be super user 1263 */ 1264 if ((error = suser(p->p_ucred, &p->p_acflag))) 1265 return (error); 1266 1267 flags = FFLAGS(SCARG(uap, flags)); 1268 if ((flags & (FREAD | FWRITE)) == 0) 1269 return (EINVAL); 1270 if ((flags & O_CREAT)) 1271 return (EINVAL); 1272 /* falloc() will use the file descriptor for us */ 1273 if ((error = falloc(p, &nfp, &indx)) != 0) 1274 return (error); 1275 fp = nfp; 1276 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1277 goto bad; 1278 1279 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1280 error = ESTALE; 1281 goto bad; 1282 } 1283 1284 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1285 vp = NULL; /* most likely unnecessary sanity for bad: */ 1286 goto bad; 1287 } 1288 1289 /* Now do an effective vn_open */ 1290 1291 if (vp->v_type == VSOCK) { 1292 error = EOPNOTSUPP; 1293 goto bad; 1294 } 1295 if (flags & FREAD) { 1296 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1297 goto bad; 1298 } 1299 if (flags & (FWRITE | O_TRUNC)) { 1300 if (vp->v_type == VDIR) { 1301 error = EISDIR; 1302 goto bad; 1303 } 1304 if ((error = vn_writechk(vp)) != 0 || 1305 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1306 goto bad; 1307 } 1308 if (flags & O_TRUNC) { 1309 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1310 goto bad; 1311 VOP_UNLOCK(vp, 0); /* XXX */ 1312 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1313 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1314 VATTR_NULL(&va); 1315 va.va_size = 0; 1316 error = VOP_SETATTR(vp, &va, cred, p); 1317 vn_finished_write(mp, 0); 1318 if (error) 1319 goto bad; 1320 } 1321 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1322 goto bad; 1323 if (vp->v_type == VREG && 1324 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1325 error = EIO; 1326 goto bad; 1327 } 1328 if (flags & FWRITE) 1329 vp->v_writecount++; 1330 1331 /* done with modified vn_open, now finish what sys_open does. */ 1332 1333 fp->f_flag = flags & FMASK; 1334 fp->f_type = DTYPE_VNODE; 1335 fp->f_ops = &vnops; 1336 fp->f_data = vp; 1337 if (flags & (O_EXLOCK | O_SHLOCK)) { 1338 lf.l_whence = SEEK_SET; 1339 lf.l_start = 0; 1340 lf.l_len = 0; 1341 if (flags & O_EXLOCK) 1342 lf.l_type = F_WRLCK; 1343 else 1344 lf.l_type = F_RDLCK; 1345 type = F_FLOCK; 1346 if ((flags & FNONBLOCK) == 0) 1347 type |= F_WAIT; 1348 VOP_UNLOCK(vp, 0); 1349 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1350 if (error) { 1351 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1352 FILE_UNUSE(fp, p); 1353 ffree(fp); 1354 fdremove(fdp, indx); 1355 return (error); 1356 } 1357 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1358 fp->f_flag |= FHASLOCK; 1359 } 1360 VOP_UNLOCK(vp, 0); 1361 *retval = indx; 1362 FILE_SET_MATURE(fp); 1363 FILE_UNUSE(fp, p); 1364 return (0); 1365 1366 bad: 1367 FILE_UNUSE(fp, p); 1368 ffree(fp); 1369 fdremove(fdp, indx); 1370 if (vp != NULL) 1371 vput(vp); 1372 return (error); 1373 } 1374 1375 /* ARGSUSED */ 1376 int 1377 sys_fhstat(l, v, retval) 1378 struct lwp *l; 1379 void *v; 1380 register_t *retval; 1381 { 1382 struct sys_fhstat_args /* { 1383 syscallarg(const fhandle_t *) fhp; 1384 syscallarg(struct stat *) sb; 1385 } */ *uap = v; 1386 struct proc *p = l->l_proc; 1387 struct stat sb; 1388 int error; 1389 fhandle_t fh; 1390 struct mount *mp; 1391 struct vnode *vp; 1392 1393 /* 1394 * Must be super user 1395 */ 1396 if ((error = suser(p->p_ucred, &p->p_acflag))) 1397 return (error); 1398 1399 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1400 return (error); 1401 1402 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1403 return (ESTALE); 1404 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1405 return (error); 1406 error = vn_stat(vp, &sb, p); 1407 vput(vp); 1408 if (error) 1409 return (error); 1410 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1411 return (error); 1412 } 1413 1414 /* ARGSUSED */ 1415 int 1416 sys_fhstatvfs1(l, v, retval) 1417 struct lwp *l; 1418 void *v; 1419 register_t *retval; 1420 { 1421 struct sys_fhstatvfs1_args /* 1422 syscallarg(const fhandle_t *) fhp; 1423 syscallarg(struct statvfs *) buf; 1424 syscallarg(int) flags; 1425 } */ *uap = v; 1426 struct proc *p = l->l_proc; 1427 struct statvfs sbuf; 1428 fhandle_t fh; 1429 struct mount *mp; 1430 struct vnode *vp; 1431 int error; 1432 1433 /* 1434 * Must be super user 1435 */ 1436 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1437 return error; 1438 1439 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1440 return error; 1441 1442 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1443 return ESTALE; 1444 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1445 return error; 1446 1447 mp = vp->v_mount; 1448 if ((error = dostatvfs(mp, &sbuf, p, SCARG(uap, flags), 1)) != 0) { 1449 vput(vp); 1450 return error; 1451 } 1452 vput(vp); 1453 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 1454 } 1455 1456 /* 1457 * Create a special file. 1458 */ 1459 /* ARGSUSED */ 1460 int 1461 sys_mknod(l, v, retval) 1462 struct lwp *l; 1463 void *v; 1464 register_t *retval; 1465 { 1466 struct sys_mknod_args /* { 1467 syscallarg(const char *) path; 1468 syscallarg(int) mode; 1469 syscallarg(int) dev; 1470 } */ *uap = v; 1471 struct proc *p = l->l_proc; 1472 struct vnode *vp; 1473 struct mount *mp; 1474 struct vattr vattr; 1475 int error; 1476 int whiteout = 0; 1477 struct nameidata nd; 1478 1479 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1480 return (error); 1481 restart: 1482 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1483 if ((error = namei(&nd)) != 0) 1484 return (error); 1485 vp = nd.ni_vp; 1486 if (vp != NULL) 1487 error = EEXIST; 1488 else { 1489 VATTR_NULL(&vattr); 1490 vattr.va_mode = 1491 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1492 vattr.va_rdev = SCARG(uap, dev); 1493 whiteout = 0; 1494 1495 switch (SCARG(uap, mode) & S_IFMT) { 1496 case S_IFMT: /* used by badsect to flag bad sectors */ 1497 vattr.va_type = VBAD; 1498 break; 1499 case S_IFCHR: 1500 vattr.va_type = VCHR; 1501 break; 1502 case S_IFBLK: 1503 vattr.va_type = VBLK; 1504 break; 1505 case S_IFWHT: 1506 whiteout = 1; 1507 break; 1508 default: 1509 error = EINVAL; 1510 break; 1511 } 1512 } 1513 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1514 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1515 if (nd.ni_dvp == vp) 1516 vrele(nd.ni_dvp); 1517 else 1518 vput(nd.ni_dvp); 1519 if (vp) 1520 vrele(vp); 1521 if ((error = vn_start_write(NULL, &mp, 1522 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1523 return (error); 1524 goto restart; 1525 } 1526 if (!error) { 1527 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1528 if (whiteout) { 1529 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1530 if (error) 1531 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1532 vput(nd.ni_dvp); 1533 } else { 1534 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1535 &nd.ni_cnd, &vattr); 1536 if (error == 0) 1537 vput(nd.ni_vp); 1538 } 1539 } else { 1540 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1541 if (nd.ni_dvp == vp) 1542 vrele(nd.ni_dvp); 1543 else 1544 vput(nd.ni_dvp); 1545 if (vp) 1546 vrele(vp); 1547 } 1548 vn_finished_write(mp, 0); 1549 return (error); 1550 } 1551 1552 /* 1553 * Create a named pipe. 1554 */ 1555 /* ARGSUSED */ 1556 int 1557 sys_mkfifo(l, v, retval) 1558 struct lwp *l; 1559 void *v; 1560 register_t *retval; 1561 { 1562 struct sys_mkfifo_args /* { 1563 syscallarg(const char *) path; 1564 syscallarg(int) mode; 1565 } */ *uap = v; 1566 struct proc *p = l->l_proc; 1567 struct mount *mp; 1568 struct vattr vattr; 1569 int error; 1570 struct nameidata nd; 1571 1572 restart: 1573 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1574 if ((error = namei(&nd)) != 0) 1575 return (error); 1576 if (nd.ni_vp != NULL) { 1577 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1578 if (nd.ni_dvp == nd.ni_vp) 1579 vrele(nd.ni_dvp); 1580 else 1581 vput(nd.ni_dvp); 1582 vrele(nd.ni_vp); 1583 return (EEXIST); 1584 } 1585 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1586 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1587 if (nd.ni_dvp == nd.ni_vp) 1588 vrele(nd.ni_dvp); 1589 else 1590 vput(nd.ni_dvp); 1591 if (nd.ni_vp) 1592 vrele(nd.ni_vp); 1593 if ((error = vn_start_write(NULL, &mp, 1594 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1595 return (error); 1596 goto restart; 1597 } 1598 VATTR_NULL(&vattr); 1599 vattr.va_type = VFIFO; 1600 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1601 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1602 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1603 if (error == 0) 1604 vput(nd.ni_vp); 1605 vn_finished_write(mp, 0); 1606 return (error); 1607 } 1608 1609 /* 1610 * Make a hard file link. 1611 */ 1612 /* ARGSUSED */ 1613 int 1614 sys_link(l, v, retval) 1615 struct lwp *l; 1616 void *v; 1617 register_t *retval; 1618 { 1619 struct sys_link_args /* { 1620 syscallarg(const char *) path; 1621 syscallarg(const char *) link; 1622 } */ *uap = v; 1623 struct proc *p = l->l_proc; 1624 struct vnode *vp; 1625 struct mount *mp; 1626 struct nameidata nd; 1627 int error; 1628 1629 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1630 if ((error = namei(&nd)) != 0) 1631 return (error); 1632 vp = nd.ni_vp; 1633 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1634 vrele(vp); 1635 return (error); 1636 } 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 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1651 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1652 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1653 out: 1654 vrele(vp); 1655 vn_finished_write(mp, 0); 1656 return (error); 1657 } 1658 1659 /* 1660 * Make a symbolic link. 1661 */ 1662 /* ARGSUSED */ 1663 int 1664 sys_symlink(l, v, retval) 1665 struct lwp *l; 1666 void *v; 1667 register_t *retval; 1668 { 1669 struct sys_symlink_args /* { 1670 syscallarg(const char *) path; 1671 syscallarg(const char *) link; 1672 } */ *uap = v; 1673 struct proc *p = l->l_proc; 1674 struct mount *mp; 1675 struct vattr vattr; 1676 char *path; 1677 int error; 1678 struct nameidata nd; 1679 1680 path = PNBUF_GET(); 1681 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1682 if (error) 1683 goto out; 1684 restart: 1685 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1686 if ((error = namei(&nd)) != 0) 1687 goto out; 1688 if (nd.ni_vp) { 1689 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1690 if (nd.ni_dvp == nd.ni_vp) 1691 vrele(nd.ni_dvp); 1692 else 1693 vput(nd.ni_dvp); 1694 vrele(nd.ni_vp); 1695 error = EEXIST; 1696 goto out; 1697 } 1698 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1699 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1700 if (nd.ni_dvp == nd.ni_vp) 1701 vrele(nd.ni_dvp); 1702 else 1703 vput(nd.ni_dvp); 1704 if ((error = vn_start_write(NULL, &mp, 1705 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1706 return (error); 1707 goto restart; 1708 } 1709 VATTR_NULL(&vattr); 1710 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1711 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1712 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1713 if (error == 0) 1714 vput(nd.ni_vp); 1715 vn_finished_write(mp, 0); 1716 out: 1717 PNBUF_PUT(path); 1718 return (error); 1719 } 1720 1721 /* 1722 * Delete a whiteout from the filesystem. 1723 */ 1724 /* ARGSUSED */ 1725 int 1726 sys_undelete(l, v, retval) 1727 struct lwp *l; 1728 void *v; 1729 register_t *retval; 1730 { 1731 struct sys_undelete_args /* { 1732 syscallarg(const char *) path; 1733 } */ *uap = v; 1734 struct proc *p = l->l_proc; 1735 int error; 1736 struct mount *mp; 1737 struct nameidata nd; 1738 1739 restart: 1740 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1741 SCARG(uap, path), p); 1742 error = namei(&nd); 1743 if (error) 1744 return (error); 1745 1746 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1747 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1748 if (nd.ni_dvp == nd.ni_vp) 1749 vrele(nd.ni_dvp); 1750 else 1751 vput(nd.ni_dvp); 1752 if (nd.ni_vp) 1753 vrele(nd.ni_vp); 1754 return (EEXIST); 1755 } 1756 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1757 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1758 if (nd.ni_dvp == nd.ni_vp) 1759 vrele(nd.ni_dvp); 1760 else 1761 vput(nd.ni_dvp); 1762 if ((error = vn_start_write(NULL, &mp, 1763 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1764 return (error); 1765 goto restart; 1766 } 1767 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1768 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1769 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1770 vput(nd.ni_dvp); 1771 vn_finished_write(mp, 0); 1772 return (error); 1773 } 1774 1775 /* 1776 * Delete a name from the filesystem. 1777 */ 1778 /* ARGSUSED */ 1779 int 1780 sys_unlink(l, v, retval) 1781 struct lwp *l; 1782 void *v; 1783 register_t *retval; 1784 { 1785 struct sys_unlink_args /* { 1786 syscallarg(const char *) path; 1787 } */ *uap = v; 1788 struct proc *p = l->l_proc; 1789 struct mount *mp; 1790 struct vnode *vp; 1791 int error; 1792 struct nameidata nd; 1793 1794 restart: 1795 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1796 SCARG(uap, path), p); 1797 if ((error = namei(&nd)) != 0) 1798 return (error); 1799 vp = nd.ni_vp; 1800 1801 /* 1802 * The root of a mounted filesystem cannot be deleted. 1803 */ 1804 if (vp->v_flag & VROOT) { 1805 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1806 if (nd.ni_dvp == vp) 1807 vrele(nd.ni_dvp); 1808 else 1809 vput(nd.ni_dvp); 1810 vput(vp); 1811 error = EBUSY; 1812 goto out; 1813 } 1814 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1815 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1816 if (nd.ni_dvp == vp) 1817 vrele(nd.ni_dvp); 1818 else 1819 vput(nd.ni_dvp); 1820 vput(vp); 1821 if ((error = vn_start_write(NULL, &mp, 1822 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1823 return (error); 1824 goto restart; 1825 } 1826 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1827 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1828 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1829 vn_finished_write(mp, 0); 1830 out: 1831 return (error); 1832 } 1833 1834 /* 1835 * Reposition read/write file offset. 1836 */ 1837 int 1838 sys_lseek(l, v, retval) 1839 struct lwp *l; 1840 void *v; 1841 register_t *retval; 1842 { 1843 struct sys_lseek_args /* { 1844 syscallarg(int) fd; 1845 syscallarg(int) pad; 1846 syscallarg(off_t) offset; 1847 syscallarg(int) whence; 1848 } */ *uap = v; 1849 struct proc *p = l->l_proc; 1850 struct ucred *cred = p->p_ucred; 1851 struct filedesc *fdp = p->p_fd; 1852 struct file *fp; 1853 struct vnode *vp; 1854 struct vattr vattr; 1855 off_t newoff; 1856 int error; 1857 1858 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1859 return (EBADF); 1860 1861 FILE_USE(fp); 1862 1863 vp = (struct vnode *)fp->f_data; 1864 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1865 error = ESPIPE; 1866 goto out; 1867 } 1868 1869 switch (SCARG(uap, whence)) { 1870 case SEEK_CUR: 1871 newoff = fp->f_offset + SCARG(uap, offset); 1872 break; 1873 case SEEK_END: 1874 error = VOP_GETATTR(vp, &vattr, cred, p); 1875 if (error) 1876 goto out; 1877 newoff = SCARG(uap, offset) + vattr.va_size; 1878 break; 1879 case SEEK_SET: 1880 newoff = SCARG(uap, offset); 1881 break; 1882 default: 1883 error = EINVAL; 1884 goto out; 1885 } 1886 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1887 goto out; 1888 1889 *(off_t *)retval = fp->f_offset = newoff; 1890 out: 1891 FILE_UNUSE(fp, p); 1892 return (error); 1893 } 1894 1895 /* 1896 * Positional read system call. 1897 */ 1898 int 1899 sys_pread(l, v, retval) 1900 struct lwp *l; 1901 void *v; 1902 register_t *retval; 1903 { 1904 struct sys_pread_args /* { 1905 syscallarg(int) fd; 1906 syscallarg(void *) buf; 1907 syscallarg(size_t) nbyte; 1908 syscallarg(off_t) offset; 1909 } */ *uap = v; 1910 struct proc *p = l->l_proc; 1911 struct filedesc *fdp = p->p_fd; 1912 struct file *fp; 1913 struct vnode *vp; 1914 off_t offset; 1915 int error, fd = SCARG(uap, fd); 1916 1917 if ((fp = fd_getfile(fdp, fd)) == NULL) 1918 return (EBADF); 1919 1920 if ((fp->f_flag & FREAD) == 0) { 1921 simple_unlock(&fp->f_slock); 1922 return (EBADF); 1923 } 1924 1925 FILE_USE(fp); 1926 1927 vp = (struct vnode *)fp->f_data; 1928 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1929 error = ESPIPE; 1930 goto out; 1931 } 1932 1933 offset = SCARG(uap, offset); 1934 1935 /* 1936 * XXX This works because no file systems actually 1937 * XXX take any action on the seek operation. 1938 */ 1939 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1940 goto out; 1941 1942 /* dofileread() will unuse the descriptor for us */ 1943 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1944 &offset, 0, retval)); 1945 1946 out: 1947 FILE_UNUSE(fp, p); 1948 return (error); 1949 } 1950 1951 /* 1952 * Positional scatter read system call. 1953 */ 1954 int 1955 sys_preadv(l, v, retval) 1956 struct lwp *l; 1957 void *v; 1958 register_t *retval; 1959 { 1960 struct sys_preadv_args /* { 1961 syscallarg(int) fd; 1962 syscallarg(const struct iovec *) iovp; 1963 syscallarg(int) iovcnt; 1964 syscallarg(off_t) offset; 1965 } */ *uap = v; 1966 struct proc *p = l->l_proc; 1967 struct filedesc *fdp = p->p_fd; 1968 struct file *fp; 1969 struct vnode *vp; 1970 off_t offset; 1971 int error, fd = SCARG(uap, fd); 1972 1973 if ((fp = fd_getfile(fdp, fd)) == NULL) 1974 return (EBADF); 1975 1976 if ((fp->f_flag & FREAD) == 0) { 1977 simple_unlock(&fp->f_slock); 1978 return (EBADF); 1979 } 1980 1981 FILE_USE(fp); 1982 1983 vp = (struct vnode *)fp->f_data; 1984 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1985 error = ESPIPE; 1986 goto out; 1987 } 1988 1989 offset = SCARG(uap, offset); 1990 1991 /* 1992 * XXX This works because no file systems actually 1993 * XXX take any action on the seek operation. 1994 */ 1995 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1996 goto out; 1997 1998 /* dofilereadv() will unuse the descriptor for us */ 1999 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2000 &offset, 0, retval)); 2001 2002 out: 2003 FILE_UNUSE(fp, p); 2004 return (error); 2005 } 2006 2007 /* 2008 * Positional write system call. 2009 */ 2010 int 2011 sys_pwrite(l, v, retval) 2012 struct lwp *l; 2013 void *v; 2014 register_t *retval; 2015 { 2016 struct sys_pwrite_args /* { 2017 syscallarg(int) fd; 2018 syscallarg(const void *) buf; 2019 syscallarg(size_t) nbyte; 2020 syscallarg(off_t) offset; 2021 } */ *uap = v; 2022 struct proc *p = l->l_proc; 2023 struct filedesc *fdp = p->p_fd; 2024 struct file *fp; 2025 struct vnode *vp; 2026 off_t offset; 2027 int error, fd = SCARG(uap, fd); 2028 2029 if ((fp = fd_getfile(fdp, fd)) == NULL) 2030 return (EBADF); 2031 2032 if ((fp->f_flag & FWRITE) == 0) { 2033 simple_unlock(&fp->f_slock); 2034 return (EBADF); 2035 } 2036 2037 FILE_USE(fp); 2038 2039 vp = (struct vnode *)fp->f_data; 2040 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2041 error = ESPIPE; 2042 goto out; 2043 } 2044 2045 offset = SCARG(uap, offset); 2046 2047 /* 2048 * XXX This works because no file systems actually 2049 * XXX take any action on the seek operation. 2050 */ 2051 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2052 goto out; 2053 2054 /* dofilewrite() will unuse the descriptor for us */ 2055 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2056 &offset, 0, retval)); 2057 2058 out: 2059 FILE_UNUSE(fp, p); 2060 return (error); 2061 } 2062 2063 /* 2064 * Positional gather write system call. 2065 */ 2066 int 2067 sys_pwritev(l, v, retval) 2068 struct lwp *l; 2069 void *v; 2070 register_t *retval; 2071 { 2072 struct sys_pwritev_args /* { 2073 syscallarg(int) fd; 2074 syscallarg(const struct iovec *) iovp; 2075 syscallarg(int) iovcnt; 2076 syscallarg(off_t) offset; 2077 } */ *uap = v; 2078 struct proc *p = l->l_proc; 2079 struct filedesc *fdp = p->p_fd; 2080 struct file *fp; 2081 struct vnode *vp; 2082 off_t offset; 2083 int error, fd = SCARG(uap, fd); 2084 2085 if ((fp = fd_getfile(fdp, fd)) == NULL) 2086 return (EBADF); 2087 2088 if ((fp->f_flag & FWRITE) == 0) { 2089 simple_unlock(&fp->f_slock); 2090 return (EBADF); 2091 } 2092 2093 FILE_USE(fp); 2094 2095 vp = (struct vnode *)fp->f_data; 2096 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2097 error = ESPIPE; 2098 goto out; 2099 } 2100 2101 offset = SCARG(uap, offset); 2102 2103 /* 2104 * XXX This works because no file systems actually 2105 * XXX take any action on the seek operation. 2106 */ 2107 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2108 goto out; 2109 2110 /* dofilewritev() will unuse the descriptor for us */ 2111 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2112 &offset, 0, retval)); 2113 2114 out: 2115 FILE_UNUSE(fp, p); 2116 return (error); 2117 } 2118 2119 /* 2120 * Check access permissions. 2121 */ 2122 int 2123 sys_access(l, v, retval) 2124 struct lwp *l; 2125 void *v; 2126 register_t *retval; 2127 { 2128 struct sys_access_args /* { 2129 syscallarg(const char *) path; 2130 syscallarg(int) flags; 2131 } */ *uap = v; 2132 struct proc *p = l->l_proc; 2133 struct ucred *cred; 2134 struct vnode *vp; 2135 int error, flags; 2136 struct nameidata nd; 2137 2138 cred = crdup(p->p_ucred); 2139 cred->cr_uid = p->p_cred->p_ruid; 2140 cred->cr_gid = p->p_cred->p_rgid; 2141 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2142 SCARG(uap, path), p); 2143 /* Override default credentials */ 2144 nd.ni_cnd.cn_cred = cred; 2145 if ((error = namei(&nd)) != 0) 2146 goto out; 2147 vp = nd.ni_vp; 2148 2149 /* Flags == 0 means only check for existence. */ 2150 if (SCARG(uap, flags)) { 2151 flags = 0; 2152 if (SCARG(uap, flags) & R_OK) 2153 flags |= VREAD; 2154 if (SCARG(uap, flags) & W_OK) 2155 flags |= VWRITE; 2156 if (SCARG(uap, flags) & X_OK) 2157 flags |= VEXEC; 2158 2159 error = VOP_ACCESS(vp, flags, cred, p); 2160 if (!error && (flags & VWRITE)) 2161 error = vn_writechk(vp); 2162 } 2163 vput(vp); 2164 out: 2165 crfree(cred); 2166 return (error); 2167 } 2168 2169 /* 2170 * Get file status; this version follows links. 2171 */ 2172 /* ARGSUSED */ 2173 int 2174 sys___stat13(l, v, retval) 2175 struct lwp *l; 2176 void *v; 2177 register_t *retval; 2178 { 2179 struct sys___stat13_args /* { 2180 syscallarg(const char *) path; 2181 syscallarg(struct stat *) ub; 2182 } */ *uap = v; 2183 struct proc *p = l->l_proc; 2184 struct stat sb; 2185 int error; 2186 struct nameidata nd; 2187 2188 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2189 SCARG(uap, path), p); 2190 if ((error = namei(&nd)) != 0) 2191 return (error); 2192 error = vn_stat(nd.ni_vp, &sb, p); 2193 vput(nd.ni_vp); 2194 if (error) 2195 return (error); 2196 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2197 return (error); 2198 } 2199 2200 /* 2201 * Get file status; this version does not follow links. 2202 */ 2203 /* ARGSUSED */ 2204 int 2205 sys___lstat13(l, v, retval) 2206 struct lwp *l; 2207 void *v; 2208 register_t *retval; 2209 { 2210 struct sys___lstat13_args /* { 2211 syscallarg(const char *) path; 2212 syscallarg(struct stat *) ub; 2213 } */ *uap = v; 2214 struct proc *p = l->l_proc; 2215 struct stat sb; 2216 int error; 2217 struct nameidata nd; 2218 2219 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2220 SCARG(uap, path), p); 2221 if ((error = namei(&nd)) != 0) 2222 return (error); 2223 error = vn_stat(nd.ni_vp, &sb, p); 2224 vput(nd.ni_vp); 2225 if (error) 2226 return (error); 2227 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2228 return (error); 2229 } 2230 2231 /* 2232 * Get configurable pathname variables. 2233 */ 2234 /* ARGSUSED */ 2235 int 2236 sys_pathconf(l, v, retval) 2237 struct lwp *l; 2238 void *v; 2239 register_t *retval; 2240 { 2241 struct sys_pathconf_args /* { 2242 syscallarg(const char *) path; 2243 syscallarg(int) name; 2244 } */ *uap = v; 2245 struct proc *p = l->l_proc; 2246 int error; 2247 struct nameidata nd; 2248 2249 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2250 SCARG(uap, path), p); 2251 if ((error = namei(&nd)) != 0) 2252 return (error); 2253 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2254 vput(nd.ni_vp); 2255 return (error); 2256 } 2257 2258 /* 2259 * Return target name of a symbolic link. 2260 */ 2261 /* ARGSUSED */ 2262 int 2263 sys_readlink(l, v, retval) 2264 struct lwp *l; 2265 void *v; 2266 register_t *retval; 2267 { 2268 struct sys_readlink_args /* { 2269 syscallarg(const char *) path; 2270 syscallarg(char *) buf; 2271 syscallarg(size_t) count; 2272 } */ *uap = v; 2273 struct proc *p = l->l_proc; 2274 struct vnode *vp; 2275 struct iovec aiov; 2276 struct uio auio; 2277 int error; 2278 struct nameidata nd; 2279 2280 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2281 SCARG(uap, path), p); 2282 if ((error = namei(&nd)) != 0) 2283 return (error); 2284 vp = nd.ni_vp; 2285 if (vp->v_type != VLNK) 2286 error = EINVAL; 2287 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2288 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2289 aiov.iov_base = SCARG(uap, buf); 2290 aiov.iov_len = SCARG(uap, count); 2291 auio.uio_iov = &aiov; 2292 auio.uio_iovcnt = 1; 2293 auio.uio_offset = 0; 2294 auio.uio_rw = UIO_READ; 2295 auio.uio_segflg = UIO_USERSPACE; 2296 auio.uio_procp = p; 2297 auio.uio_resid = SCARG(uap, count); 2298 error = VOP_READLINK(vp, &auio, p->p_ucred); 2299 } 2300 vput(vp); 2301 *retval = SCARG(uap, count) - auio.uio_resid; 2302 return (error); 2303 } 2304 2305 /* 2306 * Change flags of a file given a path name. 2307 */ 2308 /* ARGSUSED */ 2309 int 2310 sys_chflags(l, v, retval) 2311 struct lwp *l; 2312 void *v; 2313 register_t *retval; 2314 { 2315 struct sys_chflags_args /* { 2316 syscallarg(const char *) path; 2317 syscallarg(u_long) flags; 2318 } */ *uap = v; 2319 struct proc *p = l->l_proc; 2320 struct vnode *vp; 2321 int error; 2322 struct nameidata nd; 2323 2324 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2325 if ((error = namei(&nd)) != 0) 2326 return (error); 2327 vp = nd.ni_vp; 2328 error = change_flags(vp, SCARG(uap, flags), p); 2329 vput(vp); 2330 return (error); 2331 } 2332 2333 /* 2334 * Change flags of a file given a file descriptor. 2335 */ 2336 /* ARGSUSED */ 2337 int 2338 sys_fchflags(l, v, retval) 2339 struct lwp *l; 2340 void *v; 2341 register_t *retval; 2342 { 2343 struct sys_fchflags_args /* { 2344 syscallarg(int) fd; 2345 syscallarg(u_long) flags; 2346 } */ *uap = v; 2347 struct proc *p = l->l_proc; 2348 struct vnode *vp; 2349 struct file *fp; 2350 int error; 2351 2352 /* getvnode() will use the descriptor for us */ 2353 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2354 return (error); 2355 vp = (struct vnode *)fp->f_data; 2356 error = change_flags(vp, SCARG(uap, flags), p); 2357 VOP_UNLOCK(vp, 0); 2358 FILE_UNUSE(fp, p); 2359 return (error); 2360 } 2361 2362 /* 2363 * Change flags of a file given a path name; this version does 2364 * not follow links. 2365 */ 2366 int 2367 sys_lchflags(l, v, retval) 2368 struct lwp *l; 2369 void *v; 2370 register_t *retval; 2371 { 2372 struct sys_lchflags_args /* { 2373 syscallarg(const char *) path; 2374 syscallarg(u_long) flags; 2375 } */ *uap = v; 2376 struct proc *p = l->l_proc; 2377 struct vnode *vp; 2378 int error; 2379 struct nameidata nd; 2380 2381 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2382 if ((error = namei(&nd)) != 0) 2383 return (error); 2384 vp = nd.ni_vp; 2385 error = change_flags(vp, SCARG(uap, flags), p); 2386 vput(vp); 2387 return (error); 2388 } 2389 2390 /* 2391 * Common routine to change flags of a file. 2392 */ 2393 int 2394 change_flags(vp, flags, p) 2395 struct vnode *vp; 2396 u_long flags; 2397 struct proc *p; 2398 { 2399 struct mount *mp; 2400 struct vattr vattr; 2401 int error; 2402 2403 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2404 return (error); 2405 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2406 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2407 /* 2408 * Non-superusers cannot change the flags on devices, even if they 2409 * own them. 2410 */ 2411 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2412 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2413 goto out; 2414 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2415 error = EINVAL; 2416 goto out; 2417 } 2418 } 2419 VATTR_NULL(&vattr); 2420 vattr.va_flags = flags; 2421 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2422 out: 2423 vn_finished_write(mp, 0); 2424 return (error); 2425 } 2426 2427 /* 2428 * Change mode of a file given path name; this version follows links. 2429 */ 2430 /* ARGSUSED */ 2431 int 2432 sys_chmod(l, v, retval) 2433 struct lwp *l; 2434 void *v; 2435 register_t *retval; 2436 { 2437 struct sys_chmod_args /* { 2438 syscallarg(const char *) path; 2439 syscallarg(int) mode; 2440 } */ *uap = v; 2441 struct proc *p = l->l_proc; 2442 int error; 2443 struct nameidata nd; 2444 2445 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2446 if ((error = namei(&nd)) != 0) 2447 return (error); 2448 2449 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2450 2451 vrele(nd.ni_vp); 2452 return (error); 2453 } 2454 2455 /* 2456 * Change mode of a file given a file descriptor. 2457 */ 2458 /* ARGSUSED */ 2459 int 2460 sys_fchmod(l, v, retval) 2461 struct lwp *l; 2462 void *v; 2463 register_t *retval; 2464 { 2465 struct sys_fchmod_args /* { 2466 syscallarg(int) fd; 2467 syscallarg(int) mode; 2468 } */ *uap = v; 2469 struct proc *p = l->l_proc; 2470 struct file *fp; 2471 int error; 2472 2473 /* getvnode() will use the descriptor for us */ 2474 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2475 return (error); 2476 2477 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2478 FILE_UNUSE(fp, p); 2479 return (error); 2480 } 2481 2482 /* 2483 * Change mode of a file given path name; this version does not follow links. 2484 */ 2485 /* ARGSUSED */ 2486 int 2487 sys_lchmod(l, v, retval) 2488 struct lwp *l; 2489 void *v; 2490 register_t *retval; 2491 { 2492 struct sys_lchmod_args /* { 2493 syscallarg(const char *) path; 2494 syscallarg(int) mode; 2495 } */ *uap = v; 2496 struct proc *p = l->l_proc; 2497 int error; 2498 struct nameidata nd; 2499 2500 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2501 if ((error = namei(&nd)) != 0) 2502 return (error); 2503 2504 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2505 2506 vrele(nd.ni_vp); 2507 return (error); 2508 } 2509 2510 /* 2511 * Common routine to set mode given a vnode. 2512 */ 2513 static int 2514 change_mode(vp, mode, p) 2515 struct vnode *vp; 2516 int mode; 2517 struct proc *p; 2518 { 2519 struct mount *mp; 2520 struct vattr vattr; 2521 int error; 2522 2523 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2524 return (error); 2525 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2526 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2527 VATTR_NULL(&vattr); 2528 vattr.va_mode = mode & ALLPERMS; 2529 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2530 VOP_UNLOCK(vp, 0); 2531 vn_finished_write(mp, 0); 2532 return (error); 2533 } 2534 2535 /* 2536 * Set ownership given a path name; this version follows links. 2537 */ 2538 /* ARGSUSED */ 2539 int 2540 sys_chown(l, v, retval) 2541 struct lwp *l; 2542 void *v; 2543 register_t *retval; 2544 { 2545 struct sys_chown_args /* { 2546 syscallarg(const char *) path; 2547 syscallarg(uid_t) uid; 2548 syscallarg(gid_t) gid; 2549 } */ *uap = v; 2550 struct proc *p = l->l_proc; 2551 int error; 2552 struct nameidata nd; 2553 2554 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2555 if ((error = namei(&nd)) != 0) 2556 return (error); 2557 2558 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2559 2560 vrele(nd.ni_vp); 2561 return (error); 2562 } 2563 2564 /* 2565 * Set ownership given a path name; this version follows links. 2566 * Provides POSIX semantics. 2567 */ 2568 /* ARGSUSED */ 2569 int 2570 sys___posix_chown(l, v, retval) 2571 struct lwp *l; 2572 void *v; 2573 register_t *retval; 2574 { 2575 struct sys_chown_args /* { 2576 syscallarg(const char *) path; 2577 syscallarg(uid_t) uid; 2578 syscallarg(gid_t) gid; 2579 } */ *uap = v; 2580 struct proc *p = l->l_proc; 2581 int error; 2582 struct nameidata nd; 2583 2584 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2585 if ((error = namei(&nd)) != 0) 2586 return (error); 2587 2588 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2589 2590 vrele(nd.ni_vp); 2591 return (error); 2592 } 2593 2594 /* 2595 * Set ownership given a file descriptor. 2596 */ 2597 /* ARGSUSED */ 2598 int 2599 sys_fchown(l, v, retval) 2600 struct lwp *l; 2601 void *v; 2602 register_t *retval; 2603 { 2604 struct sys_fchown_args /* { 2605 syscallarg(int) fd; 2606 syscallarg(uid_t) uid; 2607 syscallarg(gid_t) gid; 2608 } */ *uap = v; 2609 struct proc *p = l->l_proc; 2610 int error; 2611 struct file *fp; 2612 2613 /* getvnode() will use the descriptor for us */ 2614 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2615 return (error); 2616 2617 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2618 SCARG(uap, gid), p, 0); 2619 FILE_UNUSE(fp, p); 2620 return (error); 2621 } 2622 2623 /* 2624 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2625 */ 2626 /* ARGSUSED */ 2627 int 2628 sys___posix_fchown(l, v, retval) 2629 struct lwp *l; 2630 void *v; 2631 register_t *retval; 2632 { 2633 struct sys_fchown_args /* { 2634 syscallarg(int) fd; 2635 syscallarg(uid_t) uid; 2636 syscallarg(gid_t) gid; 2637 } */ *uap = v; 2638 struct proc *p = l->l_proc; 2639 int error; 2640 struct file *fp; 2641 2642 /* getvnode() will use the descriptor for us */ 2643 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2644 return (error); 2645 2646 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2647 SCARG(uap, gid), p, 1); 2648 FILE_UNUSE(fp, p); 2649 return (error); 2650 } 2651 2652 /* 2653 * Set ownership given a path name; this version does not follow links. 2654 */ 2655 /* ARGSUSED */ 2656 int 2657 sys_lchown(l, v, retval) 2658 struct lwp *l; 2659 void *v; 2660 register_t *retval; 2661 { 2662 struct sys_lchown_args /* { 2663 syscallarg(const char *) path; 2664 syscallarg(uid_t) uid; 2665 syscallarg(gid_t) gid; 2666 } */ *uap = v; 2667 struct proc *p = l->l_proc; 2668 int error; 2669 struct nameidata nd; 2670 2671 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2672 if ((error = namei(&nd)) != 0) 2673 return (error); 2674 2675 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2676 2677 vrele(nd.ni_vp); 2678 return (error); 2679 } 2680 2681 /* 2682 * Set ownership given a path name; this version does not follow links. 2683 * Provides POSIX/XPG semantics. 2684 */ 2685 /* ARGSUSED */ 2686 int 2687 sys___posix_lchown(l, v, retval) 2688 struct lwp *l; 2689 void *v; 2690 register_t *retval; 2691 { 2692 struct sys_lchown_args /* { 2693 syscallarg(const char *) path; 2694 syscallarg(uid_t) uid; 2695 syscallarg(gid_t) gid; 2696 } */ *uap = v; 2697 struct proc *p = l->l_proc; 2698 int error; 2699 struct nameidata nd; 2700 2701 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2702 if ((error = namei(&nd)) != 0) 2703 return (error); 2704 2705 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2706 2707 vrele(nd.ni_vp); 2708 return (error); 2709 } 2710 2711 /* 2712 * Common routine to set ownership given a vnode. 2713 */ 2714 static int 2715 change_owner(vp, uid, gid, p, posix_semantics) 2716 struct vnode *vp; 2717 uid_t uid; 2718 gid_t gid; 2719 struct proc *p; 2720 int posix_semantics; 2721 { 2722 struct mount *mp; 2723 struct vattr vattr; 2724 mode_t newmode; 2725 int error; 2726 2727 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2728 return (error); 2729 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2731 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2732 goto out; 2733 2734 #define CHANGED(x) ((int)(x) != -1) 2735 newmode = vattr.va_mode; 2736 if (posix_semantics) { 2737 /* 2738 * POSIX/XPG semantics: if the caller is not the super-user, 2739 * clear set-user-id and set-group-id bits. Both POSIX and 2740 * the XPG consider the behaviour for calls by the super-user 2741 * implementation-defined; we leave the set-user-id and set- 2742 * group-id settings intact in that case. 2743 */ 2744 if (suser(p->p_ucred, NULL) != 0) 2745 newmode &= ~(S_ISUID | S_ISGID); 2746 } else { 2747 /* 2748 * NetBSD semantics: when changing owner and/or group, 2749 * clear the respective bit(s). 2750 */ 2751 if (CHANGED(uid)) 2752 newmode &= ~S_ISUID; 2753 if (CHANGED(gid)) 2754 newmode &= ~S_ISGID; 2755 } 2756 /* Update va_mode iff altered. */ 2757 if (vattr.va_mode == newmode) 2758 newmode = VNOVAL; 2759 2760 VATTR_NULL(&vattr); 2761 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2762 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2763 vattr.va_mode = newmode; 2764 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2765 #undef CHANGED 2766 2767 out: 2768 VOP_UNLOCK(vp, 0); 2769 vn_finished_write(mp, 0); 2770 return (error); 2771 } 2772 2773 /* 2774 * Set the access and modification times given a path name; this 2775 * version follows links. 2776 */ 2777 /* ARGSUSED */ 2778 int 2779 sys_utimes(l, v, retval) 2780 struct lwp *l; 2781 void *v; 2782 register_t *retval; 2783 { 2784 struct sys_utimes_args /* { 2785 syscallarg(const char *) path; 2786 syscallarg(const struct timeval *) tptr; 2787 } */ *uap = v; 2788 struct proc *p = l->l_proc; 2789 int error; 2790 struct nameidata nd; 2791 2792 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2793 if ((error = namei(&nd)) != 0) 2794 return (error); 2795 2796 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2797 2798 vrele(nd.ni_vp); 2799 return (error); 2800 } 2801 2802 /* 2803 * Set the access and modification times given a file descriptor. 2804 */ 2805 /* ARGSUSED */ 2806 int 2807 sys_futimes(l, v, retval) 2808 struct lwp *l; 2809 void *v; 2810 register_t *retval; 2811 { 2812 struct sys_futimes_args /* { 2813 syscallarg(int) fd; 2814 syscallarg(const struct timeval *) tptr; 2815 } */ *uap = v; 2816 struct proc *p = l->l_proc; 2817 int error; 2818 struct file *fp; 2819 2820 /* getvnode() will use the descriptor for us */ 2821 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2822 return (error); 2823 2824 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2825 FILE_UNUSE(fp, p); 2826 return (error); 2827 } 2828 2829 /* 2830 * Set the access and modification times given a path name; this 2831 * version does not follow links. 2832 */ 2833 /* ARGSUSED */ 2834 int 2835 sys_lutimes(l, v, retval) 2836 struct lwp *l; 2837 void *v; 2838 register_t *retval; 2839 { 2840 struct sys_lutimes_args /* { 2841 syscallarg(const char *) path; 2842 syscallarg(const struct timeval *) tptr; 2843 } */ *uap = v; 2844 struct proc *p = l->l_proc; 2845 int error; 2846 struct nameidata nd; 2847 2848 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2849 if ((error = namei(&nd)) != 0) 2850 return (error); 2851 2852 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2853 2854 vrele(nd.ni_vp); 2855 return (error); 2856 } 2857 2858 /* 2859 * Common routine to set access and modification times given a vnode. 2860 */ 2861 static int 2862 change_utimes(vp, tptr, p) 2863 struct vnode *vp; 2864 const struct timeval *tptr; 2865 struct proc *p; 2866 { 2867 struct timeval tv[2]; 2868 struct mount *mp; 2869 struct vattr vattr; 2870 int error; 2871 2872 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2873 return (error); 2874 VATTR_NULL(&vattr); 2875 if (tptr == NULL) { 2876 microtime(&tv[0]); 2877 tv[1] = tv[0]; 2878 vattr.va_vaflags |= VA_UTIMES_NULL; 2879 } else { 2880 error = copyin(tptr, tv, sizeof(tv)); 2881 if (error) 2882 goto out; 2883 } 2884 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2885 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2886 vattr.va_atime.tv_sec = tv[0].tv_sec; 2887 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2888 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2889 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2890 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2891 VOP_UNLOCK(vp, 0); 2892 out: 2893 vn_finished_write(mp, 0); 2894 return (error); 2895 } 2896 2897 /* 2898 * Truncate a file given its path name. 2899 */ 2900 /* ARGSUSED */ 2901 int 2902 sys_truncate(l, v, retval) 2903 struct lwp *l; 2904 void *v; 2905 register_t *retval; 2906 { 2907 struct sys_truncate_args /* { 2908 syscallarg(const char *) path; 2909 syscallarg(int) pad; 2910 syscallarg(off_t) length; 2911 } */ *uap = v; 2912 struct proc *p = l->l_proc; 2913 struct vnode *vp; 2914 struct mount *mp; 2915 struct vattr vattr; 2916 int error; 2917 struct nameidata nd; 2918 2919 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2920 if ((error = namei(&nd)) != 0) 2921 return (error); 2922 vp = nd.ni_vp; 2923 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2924 vrele(vp); 2925 return (error); 2926 } 2927 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2928 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2929 if (vp->v_type == VDIR) 2930 error = EISDIR; 2931 else if ((error = vn_writechk(vp)) == 0 && 2932 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2933 VATTR_NULL(&vattr); 2934 vattr.va_size = SCARG(uap, length); 2935 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2936 } 2937 vput(vp); 2938 vn_finished_write(mp, 0); 2939 return (error); 2940 } 2941 2942 /* 2943 * Truncate a file given a file descriptor. 2944 */ 2945 /* ARGSUSED */ 2946 int 2947 sys_ftruncate(l, v, retval) 2948 struct lwp *l; 2949 void *v; 2950 register_t *retval; 2951 { 2952 struct sys_ftruncate_args /* { 2953 syscallarg(int) fd; 2954 syscallarg(int) pad; 2955 syscallarg(off_t) length; 2956 } */ *uap = v; 2957 struct proc *p = l->l_proc; 2958 struct mount *mp; 2959 struct vattr vattr; 2960 struct vnode *vp; 2961 struct file *fp; 2962 int error; 2963 2964 /* getvnode() will use the descriptor for us */ 2965 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2966 return (error); 2967 if ((fp->f_flag & FWRITE) == 0) { 2968 error = EINVAL; 2969 goto out; 2970 } 2971 vp = (struct vnode *)fp->f_data; 2972 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 2973 FILE_UNUSE(fp, p); 2974 return (error); 2975 } 2976 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2977 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2978 if (vp->v_type == VDIR) 2979 error = EISDIR; 2980 else if ((error = vn_writechk(vp)) == 0) { 2981 VATTR_NULL(&vattr); 2982 vattr.va_size = SCARG(uap, length); 2983 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2984 } 2985 VOP_UNLOCK(vp, 0); 2986 vn_finished_write(mp, 0); 2987 out: 2988 FILE_UNUSE(fp, p); 2989 return (error); 2990 } 2991 2992 /* 2993 * Sync an open file. 2994 */ 2995 /* ARGSUSED */ 2996 int 2997 sys_fsync(l, v, retval) 2998 struct lwp *l; 2999 void *v; 3000 register_t *retval; 3001 { 3002 struct sys_fsync_args /* { 3003 syscallarg(int) fd; 3004 } */ *uap = v; 3005 struct proc *p = l->l_proc; 3006 struct vnode *vp; 3007 struct mount *mp; 3008 struct file *fp; 3009 int error; 3010 3011 /* getvnode() will use the descriptor for us */ 3012 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3013 return (error); 3014 vp = (struct vnode *)fp->f_data; 3015 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3016 FILE_UNUSE(fp, p); 3017 return (error); 3018 } 3019 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3020 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 3021 if (error == 0 && bioops.io_fsync != NULL && 3022 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3023 (*bioops.io_fsync)(vp); 3024 VOP_UNLOCK(vp, 0); 3025 vn_finished_write(mp, 0); 3026 FILE_UNUSE(fp, p); 3027 return (error); 3028 } 3029 3030 /* 3031 * Sync a range of file data. API modeled after that found in AIX. 3032 * 3033 * FDATASYNC indicates that we need only save enough metadata to be able 3034 * to re-read the written data. Note we duplicate AIX's requirement that 3035 * the file be open for writing. 3036 */ 3037 /* ARGSUSED */ 3038 int 3039 sys_fsync_range(l, v, retval) 3040 struct lwp *l; 3041 void *v; 3042 register_t *retval; 3043 { 3044 struct sys_fsync_range_args /* { 3045 syscallarg(int) fd; 3046 syscallarg(int) flags; 3047 syscallarg(off_t) start; 3048 syscallarg(int) length; 3049 } */ *uap = v; 3050 struct proc *p = l->l_proc; 3051 struct vnode *vp; 3052 struct file *fp; 3053 int flags, nflags; 3054 off_t s, e, len; 3055 int error; 3056 3057 /* getvnode() will use the descriptor for us */ 3058 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3059 return (error); 3060 3061 if ((fp->f_flag & FWRITE) == 0) { 3062 FILE_UNUSE(fp, p); 3063 return (EBADF); 3064 } 3065 3066 flags = SCARG(uap, flags); 3067 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3068 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3069 return (EINVAL); 3070 } 3071 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3072 if (flags & FDATASYNC) 3073 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3074 else 3075 nflags = FSYNC_WAIT; 3076 3077 len = SCARG(uap, length); 3078 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3079 if (len) { 3080 s = SCARG(uap, start); 3081 e = s + len; 3082 if (e < s) { 3083 FILE_UNUSE(fp, p); 3084 return (EINVAL); 3085 } 3086 } else { 3087 e = 0; 3088 s = 0; 3089 } 3090 3091 vp = (struct vnode *)fp->f_data; 3092 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3093 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, p); 3094 3095 if (error == 0 && bioops.io_fsync != NULL && 3096 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3097 (*bioops.io_fsync)(vp); 3098 3099 VOP_UNLOCK(vp, 0); 3100 FILE_UNUSE(fp, p); 3101 return (error); 3102 } 3103 3104 /* 3105 * Sync the data of an open file. 3106 */ 3107 /* ARGSUSED */ 3108 int 3109 sys_fdatasync(l, v, retval) 3110 struct lwp *l; 3111 void *v; 3112 register_t *retval; 3113 { 3114 struct sys_fdatasync_args /* { 3115 syscallarg(int) fd; 3116 } */ *uap = v; 3117 struct proc *p = l->l_proc; 3118 struct vnode *vp; 3119 struct file *fp; 3120 int error; 3121 3122 /* getvnode() will use the descriptor for us */ 3123 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3124 return (error); 3125 if ((fp->f_flag & FWRITE) == 0) { 3126 FILE_UNUSE(fp, p); 3127 return (EBADF); 3128 } 3129 vp = (struct vnode *)fp->f_data; 3130 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3131 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 3132 VOP_UNLOCK(vp, 0); 3133 FILE_UNUSE(fp, p); 3134 return (error); 3135 } 3136 3137 /* 3138 * Rename files, (standard) BSD semantics frontend. 3139 */ 3140 /* ARGSUSED */ 3141 int 3142 sys_rename(l, v, retval) 3143 struct lwp *l; 3144 void *v; 3145 register_t *retval; 3146 { 3147 struct sys_rename_args /* { 3148 syscallarg(const char *) from; 3149 syscallarg(const char *) to; 3150 } */ *uap = v; 3151 struct proc *p = l->l_proc; 3152 3153 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 3154 } 3155 3156 /* 3157 * Rename files, POSIX semantics frontend. 3158 */ 3159 /* ARGSUSED */ 3160 int 3161 sys___posix_rename(l, v, retval) 3162 struct lwp *l; 3163 void *v; 3164 register_t *retval; 3165 { 3166 struct sys___posix_rename_args /* { 3167 syscallarg(const char *) from; 3168 syscallarg(const char *) to; 3169 } */ *uap = v; 3170 struct proc *p = l->l_proc; 3171 3172 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 3173 } 3174 3175 /* 3176 * Rename files. Source and destination must either both be directories, 3177 * or both not be directories. If target is a directory, it must be empty. 3178 * If `from' and `to' refer to the same object, the value of the `retain' 3179 * argument is used to determine whether `from' will be 3180 * 3181 * (retain == 0) deleted unless `from' and `to' refer to the same 3182 * object in the file system's name space (BSD). 3183 * (retain == 1) always retained (POSIX). 3184 */ 3185 static int 3186 rename_files(from, to, p, retain) 3187 const char *from, *to; 3188 struct proc *p; 3189 int retain; 3190 { 3191 struct mount *mp = NULL; 3192 struct vnode *tvp, *fvp, *tdvp; 3193 struct nameidata fromnd, tond; 3194 int error; 3195 3196 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 3197 from, p); 3198 if ((error = namei(&fromnd)) != 0) 3199 return (error); 3200 fvp = fromnd.ni_vp; 3201 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3202 if (error != 0) { 3203 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3204 vrele(fromnd.ni_dvp); 3205 vrele(fvp); 3206 if (fromnd.ni_startdir) 3207 vrele(fromnd.ni_startdir); 3208 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3209 return (error); 3210 } 3211 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3212 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p); 3213 if ((error = namei(&tond)) != 0) { 3214 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3215 vrele(fromnd.ni_dvp); 3216 vrele(fvp); 3217 goto out1; 3218 } 3219 tdvp = tond.ni_dvp; 3220 tvp = tond.ni_vp; 3221 3222 if (tvp != NULL) { 3223 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3224 error = ENOTDIR; 3225 goto out; 3226 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3227 error = EISDIR; 3228 goto out; 3229 } 3230 } 3231 3232 if (fvp == tdvp) 3233 error = EINVAL; 3234 3235 /* 3236 * Source and destination refer to the same object. 3237 */ 3238 if (fvp == tvp) { 3239 if (retain) 3240 error = -1; 3241 else if (fromnd.ni_dvp == tdvp && 3242 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3243 !memcmp(fromnd.ni_cnd.cn_nameptr, 3244 tond.ni_cnd.cn_nameptr, 3245 fromnd.ni_cnd.cn_namelen)) 3246 error = -1; 3247 } 3248 3249 out: 3250 if (!error) { 3251 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 3252 if (fromnd.ni_dvp != tdvp) 3253 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3254 if (tvp) { 3255 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3256 } 3257 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3258 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3259 } else { 3260 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3261 if (tdvp == tvp) 3262 vrele(tdvp); 3263 else 3264 vput(tdvp); 3265 if (tvp) 3266 vput(tvp); 3267 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3268 vrele(fromnd.ni_dvp); 3269 vrele(fvp); 3270 } 3271 vrele(tond.ni_startdir); 3272 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3273 out1: 3274 vn_finished_write(mp, 0); 3275 if (fromnd.ni_startdir) 3276 vrele(fromnd.ni_startdir); 3277 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3278 return (error == -1 ? 0 : error); 3279 } 3280 3281 /* 3282 * Make a directory file. 3283 */ 3284 /* ARGSUSED */ 3285 int 3286 sys_mkdir(l, v, retval) 3287 struct lwp *l; 3288 void *v; 3289 register_t *retval; 3290 { 3291 struct sys_mkdir_args /* { 3292 syscallarg(const char *) path; 3293 syscallarg(int) mode; 3294 } */ *uap = v; 3295 struct proc *p = l->l_proc; 3296 struct mount *mp; 3297 struct vnode *vp; 3298 struct vattr vattr; 3299 int error; 3300 struct nameidata nd; 3301 3302 restart: 3303 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3304 SCARG(uap, path), p); 3305 if ((error = namei(&nd)) != 0) 3306 return (error); 3307 vp = nd.ni_vp; 3308 if (vp != NULL) { 3309 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3310 if (nd.ni_dvp == vp) 3311 vrele(nd.ni_dvp); 3312 else 3313 vput(nd.ni_dvp); 3314 vrele(vp); 3315 return (EEXIST); 3316 } 3317 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3318 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3319 if (nd.ni_dvp == vp) 3320 vrele(nd.ni_dvp); 3321 else 3322 vput(nd.ni_dvp); 3323 if ((error = vn_start_write(NULL, &mp, 3324 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3325 return (error); 3326 goto restart; 3327 } 3328 VATTR_NULL(&vattr); 3329 vattr.va_type = VDIR; 3330 vattr.va_mode = 3331 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3332 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3333 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3334 if (!error) 3335 vput(nd.ni_vp); 3336 vn_finished_write(mp, 0); 3337 return (error); 3338 } 3339 3340 /* 3341 * Remove a directory file. 3342 */ 3343 /* ARGSUSED */ 3344 int 3345 sys_rmdir(l, v, retval) 3346 struct lwp *l; 3347 void *v; 3348 register_t *retval; 3349 { 3350 struct sys_rmdir_args /* { 3351 syscallarg(const char *) path; 3352 } */ *uap = v; 3353 struct proc *p = l->l_proc; 3354 struct mount *mp; 3355 struct vnode *vp; 3356 int error; 3357 struct nameidata nd; 3358 3359 restart: 3360 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3361 SCARG(uap, path), p); 3362 if ((error = namei(&nd)) != 0) 3363 return (error); 3364 vp = nd.ni_vp; 3365 if (vp->v_type != VDIR) { 3366 error = ENOTDIR; 3367 goto out; 3368 } 3369 /* 3370 * No rmdir "." please. 3371 */ 3372 if (nd.ni_dvp == vp) { 3373 error = EINVAL; 3374 goto out; 3375 } 3376 /* 3377 * The root of a mounted filesystem cannot be deleted. 3378 */ 3379 if (vp->v_flag & VROOT) { 3380 error = EBUSY; 3381 goto out; 3382 } 3383 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3384 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3385 if (nd.ni_dvp == vp) 3386 vrele(nd.ni_dvp); 3387 else 3388 vput(nd.ni_dvp); 3389 vput(vp); 3390 if ((error = vn_start_write(NULL, &mp, 3391 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3392 return (error); 3393 goto restart; 3394 } 3395 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3396 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3397 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3398 vn_finished_write(mp, 0); 3399 return (error); 3400 3401 out: 3402 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3403 if (nd.ni_dvp == vp) 3404 vrele(nd.ni_dvp); 3405 else 3406 vput(nd.ni_dvp); 3407 vput(vp); 3408 return (error); 3409 } 3410 3411 /* 3412 * Read a block of directory entries in a file system independent format. 3413 */ 3414 int 3415 sys_getdents(l, v, retval) 3416 struct lwp *l; 3417 void *v; 3418 register_t *retval; 3419 { 3420 struct sys_getdents_args /* { 3421 syscallarg(int) fd; 3422 syscallarg(char *) buf; 3423 syscallarg(size_t) count; 3424 } */ *uap = v; 3425 struct proc *p = l->l_proc; 3426 struct file *fp; 3427 int error, done; 3428 3429 /* getvnode() will use the descriptor for us */ 3430 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3431 return (error); 3432 if ((fp->f_flag & FREAD) == 0) { 3433 error = EBADF; 3434 goto out; 3435 } 3436 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3437 SCARG(uap, count), &done, p, 0, 0); 3438 #ifdef KTRACE 3439 if (!error && KTRPOINT(p, KTR_GENIO)) { 3440 struct iovec iov; 3441 iov.iov_base = SCARG(uap, buf); 3442 iov.iov_len = done; 3443 ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3444 } 3445 #endif 3446 *retval = done; 3447 out: 3448 FILE_UNUSE(fp, p); 3449 return (error); 3450 } 3451 3452 /* 3453 * Set the mode mask for creation of filesystem nodes. 3454 */ 3455 int 3456 sys_umask(l, v, retval) 3457 struct lwp *l; 3458 void *v; 3459 register_t *retval; 3460 { 3461 struct sys_umask_args /* { 3462 syscallarg(mode_t) newmask; 3463 } */ *uap = v; 3464 struct proc *p = l->l_proc; 3465 struct cwdinfo *cwdi; 3466 3467 cwdi = p->p_cwdi; 3468 *retval = cwdi->cwdi_cmask; 3469 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3470 return (0); 3471 } 3472 3473 /* 3474 * Void all references to file by ripping underlying filesystem 3475 * away from vnode. 3476 */ 3477 /* ARGSUSED */ 3478 int 3479 sys_revoke(l, v, retval) 3480 struct lwp *l; 3481 void *v; 3482 register_t *retval; 3483 { 3484 struct sys_revoke_args /* { 3485 syscallarg(const char *) path; 3486 } */ *uap = v; 3487 struct proc *p = l->l_proc; 3488 struct mount *mp; 3489 struct vnode *vp; 3490 struct vattr vattr; 3491 int error; 3492 struct nameidata nd; 3493 3494 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3495 if ((error = namei(&nd)) != 0) 3496 return (error); 3497 vp = nd.ni_vp; 3498 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3499 goto out; 3500 if (p->p_ucred->cr_uid != vattr.va_uid && 3501 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3502 goto out; 3503 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3504 goto out; 3505 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3506 VOP_REVOKE(vp, REVOKEALL); 3507 vn_finished_write(mp, 0); 3508 out: 3509 vrele(vp); 3510 return (error); 3511 } 3512 3513 /* 3514 * Convert a user file descriptor to a kernel file entry. 3515 */ 3516 int 3517 getvnode(fdp, fd, fpp) 3518 struct filedesc *fdp; 3519 int fd; 3520 struct file **fpp; 3521 { 3522 struct vnode *vp; 3523 struct file *fp; 3524 3525 if ((fp = fd_getfile(fdp, fd)) == NULL) 3526 return (EBADF); 3527 3528 FILE_USE(fp); 3529 3530 if (fp->f_type != DTYPE_VNODE) { 3531 FILE_UNUSE(fp, NULL); 3532 return (EINVAL); 3533 } 3534 3535 vp = (struct vnode *)fp->f_data; 3536 if (vp->v_type == VBAD) { 3537 FILE_UNUSE(fp, NULL); 3538 return (EBADF); 3539 } 3540 3541 *fpp = fp; 3542 return (0); 3543 } 3544
Indexes created Wed Sep 24 02:09:48 GMT 2025