vfs_syscalls.c revision 1.185
1 /* $NetBSD: vfs_syscalls.c,v 1.185 2003/04/16 21:44:21 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.185 2003/04/16 21:44:21 christos Exp $"); 45 46 #include "opt_compat_netbsd.h" 47 #include "opt_compat_43.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/namei.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/uio.h> 60 #include <sys/malloc.h> 61 #include <sys/dirent.h> 62 #include <sys/sysctl.h> 63 #include <sys/sa.h> 64 #include <sys/syscallargs.h> 65 66 #include <miscfs/genfs/genfs.h> 67 #include <miscfs/syncfs/syncfs.h> 68 69 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 70 71 static int change_dir __P((struct nameidata *, struct proc *)); 72 static int change_flags __P((struct vnode *, u_long, struct proc *)); 73 static int change_mode __P((struct vnode *, int, struct proc *p)); 74 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 75 int)); 76 static int change_utimes __P((struct vnode *vp, const struct timeval *, 77 struct proc *p)); 78 static int rename_files __P((const char *, const char *, struct proc *, int)); 79 static int dostatfs __P((struct mount *, struct statfs *, struct proc *, int, 80 int)); 81 82 void checkdirs __P((struct vnode *)); 83 84 int dovfsusermount = 0; 85 86 /* 87 * Virtual File System System Calls 88 */ 89 90 /* 91 * Mount a file system. 92 */ 93 94 #if defined(COMPAT_09) || defined(COMPAT_43) 95 /* 96 * This table is used to maintain compatibility with 4.3BSD 97 * and NetBSD 0.9 mount syscalls. Note, the order is important! 98 * 99 * Do not modify this table. It should only contain filesystems 100 * supported by NetBSD 0.9 and 4.3BSD. 101 */ 102 const char * const mountcompatnames[] = { 103 NULL, /* 0 = MOUNT_NONE */ 104 MOUNT_FFS, /* 1 = MOUNT_UFS */ 105 MOUNT_NFS, /* 2 */ 106 MOUNT_MFS, /* 3 */ 107 MOUNT_MSDOS, /* 4 */ 108 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 109 MOUNT_FDESC, /* 6 */ 110 MOUNT_KERNFS, /* 7 */ 111 NULL, /* 8 = MOUNT_DEVFS */ 112 MOUNT_AFS, /* 9 */ 113 }; 114 const int nmountcompatnames = sizeof(mountcompatnames) / 115 sizeof(mountcompatnames[0]); 116 #endif /* COMPAT_09 || COMPAT_43 */ 117 118 /* ARGSUSED */ 119 int 120 sys_mount(l, v, retval) 121 struct lwp *l; 122 void *v; 123 register_t *retval; 124 { 125 struct sys_mount_args /* { 126 syscallarg(const char *) type; 127 syscallarg(const char *) path; 128 syscallarg(int) flags; 129 syscallarg(void *) data; 130 } */ *uap = v; 131 struct proc *p = l->l_proc; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 141 (error = suser(p->p_ucred, &p->p_acflag))) 142 return (error); 143 /* 144 * Get vnode to be covered 145 */ 146 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 147 SCARG(uap, path), p); 148 if ((error = namei(&nd)) != 0) 149 return (error); 150 vp = nd.ni_vp; 151 /* 152 * A lookup in VFS_MOUNT might result in an attempt to 153 * lock this vnode again, so make the lock recursive. 154 */ 155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 156 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 157 if ((vp->v_flag & VROOT) == 0) { 158 vput(vp); 159 return (EINVAL); 160 } 161 mp = vp->v_mount; 162 flag = mp->mnt_flag; 163 vfs = mp->mnt_op; 164 /* 165 * We only allow the filesystem to be reloaded if it 166 * is currently mounted read-only. 167 */ 168 if ((SCARG(uap, flags) & MNT_RELOAD) && 169 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 170 vput(vp); 171 return (EOPNOTSUPP); /* Needs translation */ 172 } 173 /* 174 * In "highly secure" mode, don't let the caller do anything 175 * but downgrade a filesystem from read-write to read-only. 176 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 177 */ 178 if (securelevel >= 2 && 179 SCARG(uap, flags) != MNT_GETARGS && 180 SCARG(uap, flags) != 181 (mp->mnt_flag | MNT_RDONLY | 182 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 183 vput(vp); 184 return (EPERM); 185 } 186 mp->mnt_flag |= SCARG(uap, flags) & 187 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 188 /* 189 * Only root, or the user that did the original mount is 190 * permitted to update it. 191 */ 192 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 193 mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 194 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 195 vput(vp); 196 return (error); 197 } 198 /* 199 * Do not allow NFS export by non-root users. For non-root 200 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 201 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 202 */ 203 if (p->p_ucred->cr_uid != 0) { 204 if (SCARG(uap, flags) & MNT_EXPORTED) { 205 vput(vp); 206 return (EPERM); 207 } 208 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 209 if (flag & MNT_NOEXEC) 210 SCARG(uap, flags) |= MNT_NOEXEC; 211 } 212 if (vfs_busy(mp, LK_NOWAIT, 0)) { 213 vput(vp); 214 return (EPERM); 215 } 216 goto update; 217 } else { 218 if (securelevel >= 2) { 219 vput(vp); 220 return (EPERM); 221 } 222 } 223 /* 224 * If the user is not root, ensure that they own the directory 225 * onto which we are attempting to mount. 226 */ 227 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 228 (va.va_uid != p->p_ucred->cr_uid && 229 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 230 vput(vp); 231 return (error); 232 } 233 /* 234 * Do not allow NFS export by non-root users. For non-root users, 235 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 236 * mount point is already MNT_NOEXEC. 237 */ 238 if (p->p_ucred->cr_uid != 0) { 239 if (SCARG(uap, flags) & MNT_EXPORTED) { 240 vput(vp); 241 return (EPERM); 242 } 243 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 244 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 245 SCARG(uap, flags) |= MNT_NOEXEC; 246 } 247 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 248 return (error); 249 if (vp->v_type != VDIR) { 250 vput(vp); 251 return (ENOTDIR); 252 } 253 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 254 if (error) { 255 #if defined(COMPAT_09) || defined(COMPAT_43) 256 /* 257 * Historically filesystem types were identified by number. 258 * If we get an integer for the filesystem type instead of a 259 * string, we check to see if it matches one of the historic 260 * filesystem types. 261 */ 262 u_long fsindex = (u_long)SCARG(uap, type); 263 if (fsindex >= nmountcompatnames || 264 mountcompatnames[fsindex] == NULL) { 265 vput(vp); 266 return (ENODEV); 267 } 268 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 269 #else 270 vput(vp); 271 return (error); 272 #endif 273 } 274 #ifdef COMPAT_10 275 /* Accept `ufs' as an alias for `ffs'. */ 276 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 277 strncpy(fstypename, "ffs", MFSNAMELEN); 278 #endif 279 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 280 vput(vp); 281 return (ENODEV); 282 } 283 if (vp->v_mountedhere != NULL) { 284 vput(vp); 285 return (EBUSY); 286 } 287 288 /* 289 * Allocate and initialize the file system. 290 */ 291 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 292 M_MOUNT, M_WAITOK); 293 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 294 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 295 (void)vfs_busy(mp, LK_NOWAIT, 0); 296 mp->mnt_op = vfs; 297 vfs->vfs_refcount++; 298 mp->mnt_vnodecovered = vp; 299 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 300 mp->mnt_unmounter = NULL; 301 update: 302 /* 303 * Set the mount level flags. 304 */ 305 if (SCARG(uap, flags) & MNT_RDONLY) 306 mp->mnt_flag |= MNT_RDONLY; 307 else if (mp->mnt_flag & MNT_RDONLY) 308 mp->mnt_flag |= MNT_WANTRDWR; 309 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 310 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 311 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 312 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 313 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 314 MNT_NOCOREDUMP | MNT_IGNORE | MNT_NOATIME | MNT_NODEVMTIME | 315 MNT_SYMPERM | MNT_SOFTDEP); 316 /* 317 * Mount the filesystem. 318 */ 319 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 320 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 321 if (mp->mnt_flag & MNT_WANTRDWR) 322 mp->mnt_flag &= ~MNT_RDONLY; 323 if (error || (mp->mnt_flag & MNT_GETARGS)) 324 mp->mnt_flag = flag; 325 mp->mnt_flag &=~ 326 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR | 327 MNT_GETARGS); 328 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 329 if (mp->mnt_syncer == NULL) 330 error = vfs_allocate_syncvnode(mp); 331 } else { 332 if (mp->mnt_syncer != NULL) 333 vfs_deallocate_syncvnode(mp); 334 } 335 vfs_unbusy(mp); 336 VOP_UNLOCK(vp, 0); 337 vrele(vp); 338 return (error); 339 } 340 /* 341 * Put the new filesystem on the mount list after root. 342 */ 343 cache_purge(vp); 344 if (!error) { 345 vp->v_mountedhere = mp; 346 simple_lock(&mountlist_slock); 347 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 348 simple_unlock(&mountlist_slock); 349 checkdirs(vp); 350 VOP_UNLOCK(vp, 0); 351 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 352 error = vfs_allocate_syncvnode(mp); 353 vfs_unbusy(mp); 354 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 355 if ((error = VFS_START(mp, 0, p))) 356 vrele(vp); 357 } else { 358 vp->v_mountedhere = (struct mount *)0; 359 vfs->vfs_refcount--; 360 vfs_unbusy(mp); 361 free(mp, M_MOUNT); 362 vput(vp); 363 } 364 return (error); 365 } 366 367 /* 368 * Scan all active processes to see if any of them have a current 369 * or root directory onto which the new filesystem has just been 370 * mounted. If so, replace them with the new mount point. 371 */ 372 void 373 checkdirs(olddp) 374 struct vnode *olddp; 375 { 376 struct cwdinfo *cwdi; 377 struct vnode *newdp; 378 struct proc *p; 379 380 if (olddp->v_usecount == 1) 381 return; 382 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 383 panic("mount: lost mount"); 384 proclist_lock_read(); 385 LIST_FOREACH(p, &allproc, p_list) { 386 cwdi = p->p_cwdi; 387 if (cwdi->cwdi_cdir == olddp) { 388 vrele(cwdi->cwdi_cdir); 389 VREF(newdp); 390 cwdi->cwdi_cdir = newdp; 391 } 392 if (cwdi->cwdi_rdir == olddp) { 393 vrele(cwdi->cwdi_rdir); 394 VREF(newdp); 395 cwdi->cwdi_rdir = newdp; 396 } 397 } 398 proclist_unlock_read(); 399 if (rootvnode == olddp) { 400 vrele(rootvnode); 401 VREF(newdp); 402 rootvnode = newdp; 403 } 404 vput(newdp); 405 } 406 407 /* 408 * Unmount a file system. 409 * 410 * Note: unmount takes a path to the vnode mounted on as argument, 411 * not special file (as before). 412 */ 413 /* ARGSUSED */ 414 int 415 sys_unmount(l, v, retval) 416 struct lwp *l; 417 void *v; 418 register_t *retval; 419 { 420 struct sys_unmount_args /* { 421 syscallarg(const char *) path; 422 syscallarg(int) flags; 423 } */ *uap = v; 424 struct proc *p = l->l_proc; 425 struct vnode *vp; 426 struct mount *mp; 427 int error; 428 struct nameidata nd; 429 430 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 431 SCARG(uap, path), p); 432 if ((error = namei(&nd)) != 0) 433 return (error); 434 vp = nd.ni_vp; 435 mp = vp->v_mount; 436 437 /* 438 * Only root, or the user that did the original mount is 439 * permitted to unmount this filesystem. 440 */ 441 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 442 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 443 vput(vp); 444 return (error); 445 } 446 447 /* 448 * Don't allow unmounting the root file system. 449 */ 450 if (mp->mnt_flag & MNT_ROOTFS) { 451 vput(vp); 452 return (EINVAL); 453 } 454 455 /* 456 * Must be the root of the filesystem 457 */ 458 if ((vp->v_flag & VROOT) == 0) { 459 vput(vp); 460 return (EINVAL); 461 } 462 vput(vp); 463 464 /* 465 * XXX Freeze syncer. Must do this before locking the 466 * mount point. See dounmount() for details. 467 */ 468 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 469 470 if (vfs_busy(mp, 0, 0)) { 471 lockmgr(&syncer_lock, LK_RELEASE, NULL); 472 return (EBUSY); 473 } 474 475 return (dounmount(mp, SCARG(uap, flags), p)); 476 } 477 478 /* 479 * Do the actual file system unmount. File system is assumed to have been 480 * marked busy by the caller. 481 */ 482 int 483 dounmount(mp, flags, p) 484 struct mount *mp; 485 int flags; 486 struct proc *p; 487 { 488 struct vnode *coveredvp; 489 int error; 490 int async; 491 int used_syncer; 492 493 simple_lock(&mountlist_slock); 494 vfs_unbusy(mp); 495 used_syncer = (mp->mnt_syncer != NULL); 496 497 /* 498 * XXX Syncer must be frozen when we get here. This should really 499 * be done on a per-mountpoint basis, but especially the softdep 500 * code possibly called from the syncer doens't exactly work on a 501 * per-mountpoint basis, so the softdep code would become a maze 502 * of vfs_busy() calls. 503 * 504 * The caller of dounmount() must acquire syncer_lock because 505 * the syncer itself acquires locks in syncer_lock -> vfs_busy 506 * order, and we must preserve that order to avoid deadlock. 507 * 508 * So, if the file system did not use the syncer, now is 509 * the time to release the syncer_lock. 510 */ 511 if (used_syncer == 0) 512 lockmgr(&syncer_lock, LK_RELEASE, NULL); 513 514 mp->mnt_flag |= MNT_UNMOUNT; 515 mp->mnt_unmounter = p; 516 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 517 if (mp->mnt_flag & MNT_EXPUBLIC) 518 vfs_setpublicfs(NULL, NULL, NULL); 519 async = mp->mnt_flag & MNT_ASYNC; 520 mp->mnt_flag &= ~MNT_ASYNC; 521 cache_purgevfs(mp); /* remove cache entries for this file sys */ 522 if (mp->mnt_syncer != NULL) 523 vfs_deallocate_syncvnode(mp); 524 if (((mp->mnt_flag & MNT_RDONLY) || 525 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 526 (flags & MNT_FORCE)) 527 error = VFS_UNMOUNT(mp, flags, p); 528 simple_lock(&mountlist_slock); 529 if (error) { 530 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 531 (void) vfs_allocate_syncvnode(mp); 532 mp->mnt_flag &= ~MNT_UNMOUNT; 533 mp->mnt_unmounter = NULL; 534 mp->mnt_flag |= async; 535 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 536 &mountlist_slock); 537 if (used_syncer) 538 lockmgr(&syncer_lock, LK_RELEASE, NULL); 539 while (mp->mnt_wcnt > 0) { 540 wakeup(mp); 541 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 542 } 543 return (error); 544 } 545 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 546 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 547 coveredvp->v_mountedhere = NULL; 548 vrele(coveredvp); 549 } 550 mp->mnt_op->vfs_refcount--; 551 if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) 552 panic("unmount: dangling vnode"); 553 mp->mnt_flag |= MNT_GONE; 554 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 555 if (used_syncer) 556 lockmgr(&syncer_lock, LK_RELEASE, NULL); 557 while(mp->mnt_wcnt > 0) { 558 wakeup(mp); 559 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 560 } 561 free(mp, M_MOUNT); 562 return (0); 563 } 564 565 /* 566 * Sync each mounted filesystem. 567 */ 568 #ifdef DEBUG 569 int syncprt = 0; 570 struct ctldebug debug0 = { "syncprt", &syncprt }; 571 #endif 572 573 /* ARGSUSED */ 574 int 575 sys_sync(l, v, retval) 576 struct lwp *l; 577 void *v; 578 register_t *retval; 579 { 580 struct mount *mp, *nmp; 581 int asyncflag; 582 struct proc *p = l == NULL ? &proc0 : l->l_proc; 583 584 simple_lock(&mountlist_slock); 585 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 586 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 587 nmp = mp->mnt_list.cqe_prev; 588 continue; 589 } 590 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 591 asyncflag = mp->mnt_flag & MNT_ASYNC; 592 mp->mnt_flag &= ~MNT_ASYNC; 593 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 594 if (asyncflag) 595 mp->mnt_flag |= MNT_ASYNC; 596 } 597 simple_lock(&mountlist_slock); 598 nmp = mp->mnt_list.cqe_prev; 599 vfs_unbusy(mp); 600 601 } 602 simple_unlock(&mountlist_slock); 603 #ifdef DEBUG 604 if (syncprt) 605 vfs_bufstats(); 606 #endif /* DEBUG */ 607 return (0); 608 } 609 610 /* 611 * Change filesystem quotas. 612 */ 613 /* ARGSUSED */ 614 int 615 sys_quotactl(l, v, retval) 616 struct lwp *l; 617 void *v; 618 register_t *retval; 619 { 620 struct sys_quotactl_args /* { 621 syscallarg(const char *) path; 622 syscallarg(int) cmd; 623 syscallarg(int) uid; 624 syscallarg(caddr_t) arg; 625 } */ *uap = v; 626 struct proc *p = l->l_proc; 627 struct mount *mp; 628 int error; 629 struct nameidata nd; 630 631 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 632 if ((error = namei(&nd)) != 0) 633 return (error); 634 mp = nd.ni_vp->v_mount; 635 vrele(nd.ni_vp); 636 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 637 SCARG(uap, arg), p)); 638 } 639 640 static int 641 dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags, 642 int root) 643 { 644 struct cwdinfo *cwdi = p->p_cwdi; 645 int error = 0; 646 647 /* 648 * If MNT_NOWAIT or MNT_LAZY is specified, do not 649 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 650 * overrides MNT_NOWAIT. 651 */ 652 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 653 (flags != MNT_WAIT && flags != 0)) { 654 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 655 goto done; 656 } 657 658 if ((error = VFS_STATFS(mp, sp, p)) != 0) { 659 return error; 660 } 661 662 if (cwdi->cwdi_rdir == NULL) 663 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 664 done: 665 if (cwdi->cwdi_rdir != NULL) { 666 size_t len; 667 char *bp; 668 char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 669 if (!path) 670 return ENOMEM; 671 672 bp = path + MAXPATHLEN; 673 *--bp = '\0'; 674 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 675 MAXPATHLEN / 2, 0, p); 676 if (error) { 677 free(path, M_TEMP); 678 return error; 679 } 680 len = strlen(bp); 681 /* 682 * for mount points that are below our root, we can see 683 * them, so we fix up the pathname and return them. The 684 * rest we cannot see, so we don't allow viewing the 685 * data. 686 */ 687 if (strncmp(bp, sp->f_mntonname, len) == 0) { 688 strcpy(sp->f_mntonname, &sp->f_mntonname[len]); 689 if (sp->f_mntonname[0] == '\0') 690 (void)strcpy(sp->f_mntonname, "/"); 691 } else { 692 if (root) 693 (void)strcpy(sp->f_mntonname, "/"); 694 else 695 error = EPERM; 696 } 697 free(path, M_TEMP); 698 } 699 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 700 sp->f_oflags = sp->f_flags & 0xffff; 701 return error; 702 } 703 704 /* 705 * Get filesystem statistics. 706 */ 707 /* ARGSUSED */ 708 int 709 sys_statfs(l, v, retval) 710 struct lwp *l; 711 void *v; 712 register_t *retval; 713 { 714 struct sys_statfs_args /* { 715 syscallarg(const char *) path; 716 syscallarg(struct statfs *) buf; 717 } */ *uap = v; 718 struct proc *p = l->l_proc; 719 struct mount *mp; 720 struct statfs sbuf; 721 int error; 722 struct nameidata nd; 723 724 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 725 if ((error = namei(&nd)) != 0) 726 return error; 727 mp = nd.ni_vp->v_mount; 728 vrele(nd.ni_vp); 729 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 730 return error; 731 return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 732 } 733 734 /* 735 * Get filesystem statistics. 736 */ 737 /* ARGSUSED */ 738 int 739 sys_fstatfs(l, v, retval) 740 struct lwp *l; 741 void *v; 742 register_t *retval; 743 { 744 struct sys_fstatfs_args /* { 745 syscallarg(int) fd; 746 syscallarg(struct statfs *) buf; 747 } */ *uap = v; 748 struct proc *p = l->l_proc; 749 struct file *fp; 750 struct mount *mp; 751 struct statfs sbuf; 752 int error; 753 754 /* getvnode() will use the descriptor for us */ 755 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 756 return (error); 757 mp = ((struct vnode *)fp->f_data)->v_mount; 758 if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) 759 goto out; 760 error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); 761 out: 762 FILE_UNUSE(fp, p); 763 return error; 764 } 765 766 767 /* 768 * Get statistics on all filesystems. 769 */ 770 int 771 sys_getfsstat(l, v, retval) 772 struct lwp *l; 773 void *v; 774 register_t *retval; 775 { 776 struct sys_getfsstat_args /* { 777 syscallarg(struct statfs *) buf; 778 syscallarg(long) bufsize; 779 syscallarg(int) flags; 780 } */ *uap = v; 781 int root = 0; 782 struct proc *p = l->l_proc; 783 struct mount *mp, *nmp; 784 struct statfs sbuf; 785 caddr_t sfsp; 786 long count, maxcount, error = 0; 787 788 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 789 sfsp = (caddr_t)SCARG(uap, buf); 790 simple_lock(&mountlist_slock); 791 count = 0; 792 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 793 mp = nmp) { 794 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 795 nmp = CIRCLEQ_NEXT(mp, mnt_list); 796 continue; 797 } 798 if (sfsp && count < maxcount) { 799 error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0); 800 if (error) { 801 nmp = CIRCLEQ_NEXT(mp, mnt_list); 802 vfs_unbusy(mp); 803 continue; 804 } 805 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 806 if (error) { 807 vfs_unbusy(mp); 808 return (error); 809 } 810 sfsp += sizeof(sbuf); 811 root |= strcmp(sbuf.f_mntonname, "/") == 0; 812 } 813 count++; 814 nmp = CIRCLEQ_NEXT(mp, mnt_list); 815 vfs_unbusy(mp); 816 } 817 simple_unlock(&mountlist_slock); 818 if (root == 0 && p->p_cwdi->cwdi_rdir) { 819 /* 820 * fake a root entry 821 */ 822 if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, 823 SCARG(uap, flags), 1)) != 0) 824 return error; 825 if (sfsp) 826 error = copyout(&sbuf, sfsp, sizeof(sbuf)); 827 count++; 828 } 829 if (sfsp && count > maxcount) 830 *retval = maxcount; 831 else 832 *retval = count; 833 return error; 834 } 835 836 /* 837 * Change current working directory to a given file descriptor. 838 */ 839 /* ARGSUSED */ 840 int 841 sys_fchdir(l, v, retval) 842 struct lwp *l; 843 void *v; 844 register_t *retval; 845 { 846 struct sys_fchdir_args /* { 847 syscallarg(int) fd; 848 } */ *uap = v; 849 struct proc *p = l->l_proc; 850 struct filedesc *fdp = p->p_fd; 851 struct cwdinfo *cwdi = p->p_cwdi; 852 struct vnode *vp, *tdp; 853 struct mount *mp; 854 struct file *fp; 855 int error; 856 857 /* getvnode() will use the descriptor for us */ 858 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 859 return (error); 860 vp = (struct vnode *)fp->f_data; 861 862 VREF(vp); 863 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 864 if (vp->v_type != VDIR) 865 error = ENOTDIR; 866 else 867 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 868 while (!error && (mp = vp->v_mountedhere) != NULL) { 869 if (vfs_busy(mp, 0, 0)) 870 continue; 871 error = VFS_ROOT(mp, &tdp); 872 vfs_unbusy(mp); 873 if (error) 874 break; 875 vput(vp); 876 vp = tdp; 877 } 878 if (error) { 879 vput(vp); 880 goto out; 881 } 882 VOP_UNLOCK(vp, 0); 883 884 /* 885 * Disallow changing to a directory not under the process's 886 * current root directory (if there is one). 887 */ 888 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 889 vrele(vp); 890 error = EPERM; /* operation not permitted */ 891 goto out; 892 } 893 894 vrele(cwdi->cwdi_cdir); 895 cwdi->cwdi_cdir = vp; 896 out: 897 FILE_UNUSE(fp, p); 898 return (error); 899 } 900 901 /* 902 * Change this process's notion of the root directory to a given file descriptor. 903 */ 904 905 int 906 sys_fchroot(l, v, retval) 907 struct lwp *l; 908 void *v; 909 register_t *retval; 910 { 911 struct sys_fchroot_args *uap = v; 912 struct proc *p = l->l_proc; 913 struct filedesc *fdp = p->p_fd; 914 struct cwdinfo *cwdi = p->p_cwdi; 915 struct vnode *vp; 916 struct file *fp; 917 int error; 918 919 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 920 return error; 921 /* getvnode() will use the descriptor for us */ 922 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 923 return error; 924 vp = (struct vnode *) fp->f_data; 925 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 926 if (vp->v_type != VDIR) 927 error = ENOTDIR; 928 else 929 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 930 VOP_UNLOCK(vp, 0); 931 if (error) 932 goto out; 933 VREF(vp); 934 935 /* 936 * Prevent escaping from chroot by putting the root under 937 * the working directory. Silently chdir to / if we aren't 938 * already there. 939 */ 940 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 941 /* 942 * XXX would be more failsafe to change directory to a 943 * deadfs node here instead 944 */ 945 vrele(cwdi->cwdi_cdir); 946 VREF(vp); 947 cwdi->cwdi_cdir = vp; 948 } 949 950 if (cwdi->cwdi_rdir != NULL) 951 vrele(cwdi->cwdi_rdir); 952 cwdi->cwdi_rdir = vp; 953 out: 954 FILE_UNUSE(fp, p); 955 return (error); 956 } 957 958 959 960 /* 961 * Change current working directory (``.''). 962 */ 963 /* ARGSUSED */ 964 int 965 sys_chdir(l, v, retval) 966 struct lwp *l; 967 void *v; 968 register_t *retval; 969 { 970 struct sys_chdir_args /* { 971 syscallarg(const char *) path; 972 } */ *uap = v; 973 struct proc *p = l->l_proc; 974 struct cwdinfo *cwdi = p->p_cwdi; 975 int error; 976 struct nameidata nd; 977 978 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 979 SCARG(uap, path), p); 980 if ((error = change_dir(&nd, p)) != 0) 981 return (error); 982 vrele(cwdi->cwdi_cdir); 983 cwdi->cwdi_cdir = nd.ni_vp; 984 return (0); 985 } 986 987 /* 988 * Change notion of root (``/'') directory. 989 */ 990 /* ARGSUSED */ 991 int 992 sys_chroot(l, v, retval) 993 struct lwp *l; 994 void *v; 995 register_t *retval; 996 { 997 struct sys_chroot_args /* { 998 syscallarg(const char *) path; 999 } */ *uap = v; 1000 struct proc *p = l->l_proc; 1001 struct cwdinfo *cwdi = p->p_cwdi; 1002 struct vnode *vp; 1003 int error; 1004 struct nameidata nd; 1005 1006 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1007 return (error); 1008 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1009 SCARG(uap, path), p); 1010 if ((error = change_dir(&nd, p)) != 0) 1011 return (error); 1012 if (cwdi->cwdi_rdir != NULL) 1013 vrele(cwdi->cwdi_rdir); 1014 vp = nd.ni_vp; 1015 cwdi->cwdi_rdir = vp; 1016 1017 /* 1018 * Prevent escaping from chroot by putting the root under 1019 * the working directory. Silently chdir to / if we aren't 1020 * already there. 1021 */ 1022 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 1023 /* 1024 * XXX would be more failsafe to change directory to a 1025 * deadfs node here instead 1026 */ 1027 vrele(cwdi->cwdi_cdir); 1028 VREF(vp); 1029 cwdi->cwdi_cdir = vp; 1030 } 1031 1032 return (0); 1033 } 1034 1035 /* 1036 * Common routine for chroot and chdir. 1037 */ 1038 static int 1039 change_dir(ndp, p) 1040 struct nameidata *ndp; 1041 struct proc *p; 1042 { 1043 struct vnode *vp; 1044 int error; 1045 1046 if ((error = namei(ndp)) != 0) 1047 return (error); 1048 vp = ndp->ni_vp; 1049 if (vp->v_type != VDIR) 1050 error = ENOTDIR; 1051 else 1052 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 1053 1054 if (error) 1055 vput(vp); 1056 else 1057 VOP_UNLOCK(vp, 0); 1058 return (error); 1059 } 1060 1061 /* 1062 * Check permissions, allocate an open file structure, 1063 * and call the device open routine if any. 1064 */ 1065 int 1066 sys_open(l, v, retval) 1067 struct lwp *l; 1068 void *v; 1069 register_t *retval; 1070 { 1071 struct sys_open_args /* { 1072 syscallarg(const char *) path; 1073 syscallarg(int) flags; 1074 syscallarg(int) mode; 1075 } */ *uap = v; 1076 struct proc *p = l->l_proc; 1077 struct cwdinfo *cwdi = p->p_cwdi; 1078 struct filedesc *fdp = p->p_fd; 1079 struct file *fp; 1080 struct vnode *vp; 1081 int flags, cmode; 1082 int type, indx, error; 1083 struct flock lf; 1084 struct nameidata nd; 1085 1086 flags = FFLAGS(SCARG(uap, flags)); 1087 if ((flags & (FREAD | FWRITE)) == 0) 1088 return (EINVAL); 1089 /* falloc() will use the file descriptor for us */ 1090 if ((error = falloc(p, &fp, &indx)) != 0) 1091 return (error); 1092 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1093 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1094 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1095 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1096 FILE_UNUSE(fp, p); 1097 ffree(fp); 1098 if ((error == ENODEV || error == ENXIO) && 1099 p->p_dupfd >= 0 && /* XXX from fdopen */ 1100 (error = 1101 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1102 *retval = indx; 1103 return (0); 1104 } 1105 if (error == ERESTART) 1106 error = EINTR; 1107 fdremove(fdp, indx); 1108 return (error); 1109 } 1110 p->p_dupfd = 0; 1111 vp = nd.ni_vp; 1112 fp->f_flag = flags & FMASK; 1113 fp->f_type = DTYPE_VNODE; 1114 fp->f_ops = &vnops; 1115 fp->f_data = vp; 1116 if (flags & (O_EXLOCK | O_SHLOCK)) { 1117 lf.l_whence = SEEK_SET; 1118 lf.l_start = 0; 1119 lf.l_len = 0; 1120 if (flags & O_EXLOCK) 1121 lf.l_type = F_WRLCK; 1122 else 1123 lf.l_type = F_RDLCK; 1124 type = F_FLOCK; 1125 if ((flags & FNONBLOCK) == 0) 1126 type |= F_WAIT; 1127 VOP_UNLOCK(vp, 0); 1128 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1129 if (error) { 1130 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1131 FILE_UNUSE(fp, p); 1132 ffree(fp); 1133 fdremove(fdp, indx); 1134 return (error); 1135 } 1136 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1137 fp->f_flag |= FHASLOCK; 1138 } 1139 VOP_UNLOCK(vp, 0); 1140 *retval = indx; 1141 FILE_SET_MATURE(fp); 1142 FILE_UNUSE(fp, p); 1143 return (0); 1144 } 1145 1146 /* 1147 * Get file handle system call 1148 */ 1149 int 1150 sys_getfh(l, v, retval) 1151 struct lwp *l; 1152 void *v; 1153 register_t *retval; 1154 { 1155 struct sys_getfh_args /* { 1156 syscallarg(char *) fname; 1157 syscallarg(fhandle_t *) fhp; 1158 } */ *uap = v; 1159 struct proc *p = l->l_proc; 1160 struct vnode *vp; 1161 fhandle_t fh; 1162 int error; 1163 struct nameidata nd; 1164 1165 /* 1166 * Must be super user 1167 */ 1168 error = suser(p->p_ucred, &p->p_acflag); 1169 if (error) 1170 return (error); 1171 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1172 SCARG(uap, fname), p); 1173 error = namei(&nd); 1174 if (error) 1175 return (error); 1176 vp = nd.ni_vp; 1177 memset(&fh, 0, sizeof(fh)); 1178 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1179 error = VFS_VPTOFH(vp, &fh.fh_fid); 1180 vput(vp); 1181 if (error) 1182 return (error); 1183 error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1184 return (error); 1185 } 1186 1187 /* 1188 * Open a file given a file handle. 1189 * 1190 * Check permissions, allocate an open file structure, 1191 * and call the device open routine if any. 1192 */ 1193 int 1194 sys_fhopen(l, v, retval) 1195 struct lwp *l; 1196 void *v; 1197 register_t *retval; 1198 { 1199 struct sys_fhopen_args /* { 1200 syscallarg(const fhandle_t *) fhp; 1201 syscallarg(int) flags; 1202 } */ *uap = v; 1203 struct proc *p = l->l_proc; 1204 struct filedesc *fdp = p->p_fd; 1205 struct file *fp; 1206 struct vnode *vp = NULL; 1207 struct mount *mp; 1208 struct ucred *cred = p->p_ucred; 1209 int flags; 1210 struct file *nfp; 1211 int type, indx, error=0; 1212 struct flock lf; 1213 struct vattr va; 1214 fhandle_t fh; 1215 1216 /* 1217 * Must be super user 1218 */ 1219 if ((error = suser(p->p_ucred, &p->p_acflag))) 1220 return (error); 1221 1222 flags = FFLAGS(SCARG(uap, flags)); 1223 if ((flags & (FREAD | FWRITE)) == 0) 1224 return (EINVAL); 1225 if ((flags & O_CREAT)) 1226 return (EINVAL); 1227 /* falloc() will use the file descriptor for us */ 1228 if ((error = falloc(p, &nfp, &indx)) != 0) 1229 return (error); 1230 fp = nfp; 1231 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1232 goto bad; 1233 1234 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1235 error = ESTALE; 1236 goto bad; 1237 } 1238 1239 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1240 vp = NULL; /* most likely unnecessary sanity for bad: */ 1241 goto bad; 1242 } 1243 1244 /* Now do an effective vn_open */ 1245 1246 if (vp->v_type == VSOCK) { 1247 error = EOPNOTSUPP; 1248 goto bad; 1249 } 1250 if (flags & FREAD) { 1251 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1252 goto bad; 1253 } 1254 if (flags & (FWRITE | O_TRUNC)) { 1255 if (vp->v_type == VDIR) { 1256 error = EISDIR; 1257 goto bad; 1258 } 1259 if ((error = vn_writechk(vp)) != 0 || 1260 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1261 goto bad; 1262 } 1263 if (flags & O_TRUNC) { 1264 VOP_UNLOCK(vp, 0); /* XXX */ 1265 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1266 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1267 VATTR_NULL(&va); 1268 va.va_size = 0; 1269 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1270 goto bad; 1271 } 1272 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1273 goto bad; 1274 if (vp->v_type == VREG && 1275 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1276 error = EIO; 1277 goto bad; 1278 } 1279 if (flags & FWRITE) 1280 vp->v_writecount++; 1281 1282 /* done with modified vn_open, now finish what sys_open does. */ 1283 1284 fp->f_flag = flags & FMASK; 1285 fp->f_type = DTYPE_VNODE; 1286 fp->f_ops = &vnops; 1287 fp->f_data = vp; 1288 if (flags & (O_EXLOCK | O_SHLOCK)) { 1289 lf.l_whence = SEEK_SET; 1290 lf.l_start = 0; 1291 lf.l_len = 0; 1292 if (flags & O_EXLOCK) 1293 lf.l_type = F_WRLCK; 1294 else 1295 lf.l_type = F_RDLCK; 1296 type = F_FLOCK; 1297 if ((flags & FNONBLOCK) == 0) 1298 type |= F_WAIT; 1299 VOP_UNLOCK(vp, 0); 1300 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1301 if (error) { 1302 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1303 FILE_UNUSE(fp, p); 1304 ffree(fp); 1305 fdremove(fdp, indx); 1306 return (error); 1307 } 1308 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1309 fp->f_flag |= FHASLOCK; 1310 } 1311 VOP_UNLOCK(vp, 0); 1312 *retval = indx; 1313 FILE_SET_MATURE(fp); 1314 FILE_UNUSE(fp, p); 1315 return (0); 1316 1317 bad: 1318 FILE_UNUSE(fp, p); 1319 ffree(fp); 1320 fdremove(fdp, indx); 1321 if (vp != NULL) 1322 vput(vp); 1323 return (error); 1324 } 1325 1326 /* ARGSUSED */ 1327 int 1328 sys_fhstat(l, v, retval) 1329 struct lwp *l; 1330 void *v; 1331 register_t *retval; 1332 { 1333 struct sys_fhstat_args /* { 1334 syscallarg(const fhandle_t *) fhp; 1335 syscallarg(struct stat *) sb; 1336 } */ *uap = v; 1337 struct proc *p = l->l_proc; 1338 struct stat sb; 1339 int error; 1340 fhandle_t fh; 1341 struct mount *mp; 1342 struct vnode *vp; 1343 1344 /* 1345 * Must be super user 1346 */ 1347 if ((error = suser(p->p_ucred, &p->p_acflag))) 1348 return (error); 1349 1350 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1351 return (error); 1352 1353 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1354 return (ESTALE); 1355 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1356 return (error); 1357 error = vn_stat(vp, &sb, p); 1358 vput(vp); 1359 if (error) 1360 return (error); 1361 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1362 return (error); 1363 } 1364 1365 /* ARGSUSED */ 1366 int 1367 sys_fhstatfs(l, v, retval) 1368 struct lwp *l; 1369 void *v; 1370 register_t *retval; 1371 { 1372 struct sys_fhstatfs_args /* 1373 syscallarg(const fhandle_t *) fhp; 1374 syscallarg(struct statfs *) buf; 1375 } */ *uap = v; 1376 struct proc *p = l->l_proc; 1377 struct statfs sbuf; 1378 fhandle_t fh; 1379 struct mount *mp; 1380 struct vnode *vp; 1381 int error; 1382 1383 /* 1384 * Must be super user 1385 */ 1386 if ((error = suser(p->p_ucred, &p->p_acflag))) 1387 return (error); 1388 1389 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1390 return (error); 1391 1392 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1393 return (ESTALE); 1394 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1395 return (error); 1396 mp = vp->v_mount; 1397 vput(vp); 1398 if ((error = VFS_STATFS(mp, &sbuf, p)) != 0) 1399 return (error); 1400 return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf))); 1401 } 1402 1403 /* 1404 * Create a special file. 1405 */ 1406 /* ARGSUSED */ 1407 int 1408 sys_mknod(l, v, retval) 1409 struct lwp *l; 1410 void *v; 1411 register_t *retval; 1412 { 1413 struct sys_mknod_args /* { 1414 syscallarg(const char *) path; 1415 syscallarg(int) mode; 1416 syscallarg(int) dev; 1417 } */ *uap = v; 1418 struct proc *p = l->l_proc; 1419 struct vnode *vp; 1420 struct vattr vattr; 1421 int error; 1422 int whiteout = 0; 1423 struct nameidata nd; 1424 1425 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1426 return (error); 1427 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1428 if ((error = namei(&nd)) != 0) 1429 return (error); 1430 vp = nd.ni_vp; 1431 if (vp != NULL) 1432 error = EEXIST; 1433 else { 1434 VATTR_NULL(&vattr); 1435 vattr.va_mode = 1436 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1437 vattr.va_rdev = SCARG(uap, dev); 1438 whiteout = 0; 1439 1440 switch (SCARG(uap, mode) & S_IFMT) { 1441 case S_IFMT: /* used by badsect to flag bad sectors */ 1442 vattr.va_type = VBAD; 1443 break; 1444 case S_IFCHR: 1445 vattr.va_type = VCHR; 1446 break; 1447 case S_IFBLK: 1448 vattr.va_type = VBLK; 1449 break; 1450 case S_IFWHT: 1451 whiteout = 1; 1452 break; 1453 default: 1454 error = EINVAL; 1455 break; 1456 } 1457 } 1458 if (!error) { 1459 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1460 if (whiteout) { 1461 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1462 if (error) 1463 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1464 vput(nd.ni_dvp); 1465 } else { 1466 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1467 &nd.ni_cnd, &vattr); 1468 if (error == 0) 1469 vput(nd.ni_vp); 1470 } 1471 } else { 1472 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1473 if (nd.ni_dvp == vp) 1474 vrele(nd.ni_dvp); 1475 else 1476 vput(nd.ni_dvp); 1477 if (vp) 1478 vrele(vp); 1479 } 1480 return (error); 1481 } 1482 1483 /* 1484 * Create a named pipe. 1485 */ 1486 /* ARGSUSED */ 1487 int 1488 sys_mkfifo(l, v, retval) 1489 struct lwp *l; 1490 void *v; 1491 register_t *retval; 1492 { 1493 struct sys_mkfifo_args /* { 1494 syscallarg(const char *) path; 1495 syscallarg(int) mode; 1496 } */ *uap = v; 1497 struct proc *p = l->l_proc; 1498 struct vattr vattr; 1499 int error; 1500 struct nameidata nd; 1501 1502 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1503 if ((error = namei(&nd)) != 0) 1504 return (error); 1505 if (nd.ni_vp != NULL) { 1506 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1507 if (nd.ni_dvp == nd.ni_vp) 1508 vrele(nd.ni_dvp); 1509 else 1510 vput(nd.ni_dvp); 1511 vrele(nd.ni_vp); 1512 return (EEXIST); 1513 } 1514 VATTR_NULL(&vattr); 1515 vattr.va_type = VFIFO; 1516 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1517 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1518 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1519 if (error == 0) 1520 vput(nd.ni_vp); 1521 return (error); 1522 } 1523 1524 /* 1525 * Make a hard file link. 1526 */ 1527 /* ARGSUSED */ 1528 int 1529 sys_link(l, v, retval) 1530 struct lwp *l; 1531 void *v; 1532 register_t *retval; 1533 { 1534 struct sys_link_args /* { 1535 syscallarg(const char *) path; 1536 syscallarg(const char *) link; 1537 } */ *uap = v; 1538 struct proc *p = l->l_proc; 1539 struct vnode *vp; 1540 struct nameidata nd; 1541 int error; 1542 1543 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1544 if ((error = namei(&nd)) != 0) 1545 return (error); 1546 vp = nd.ni_vp; 1547 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1548 if ((error = namei(&nd)) != 0) 1549 goto out; 1550 if (nd.ni_vp) { 1551 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1552 if (nd.ni_dvp == nd.ni_vp) 1553 vrele(nd.ni_dvp); 1554 else 1555 vput(nd.ni_dvp); 1556 vrele(nd.ni_vp); 1557 error = EEXIST; 1558 goto out; 1559 } 1560 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1561 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1562 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1563 out: 1564 vrele(vp); 1565 return (error); 1566 } 1567 1568 /* 1569 * Make a symbolic link. 1570 */ 1571 /* ARGSUSED */ 1572 int 1573 sys_symlink(l, v, retval) 1574 struct lwp *l; 1575 void *v; 1576 register_t *retval; 1577 { 1578 struct sys_symlink_args /* { 1579 syscallarg(const char *) path; 1580 syscallarg(const char *) link; 1581 } */ *uap = v; 1582 struct proc *p = l->l_proc; 1583 struct vattr vattr; 1584 char *path; 1585 int error; 1586 struct nameidata nd; 1587 1588 path = PNBUF_GET(); 1589 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1590 if (error) 1591 goto out; 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 VATTR_NULL(&vattr); 1606 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1607 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1608 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1609 if (error == 0) 1610 vput(nd.ni_vp); 1611 out: 1612 PNBUF_PUT(path); 1613 return (error); 1614 } 1615 1616 /* 1617 * Delete a whiteout from the filesystem. 1618 */ 1619 /* ARGSUSED */ 1620 int 1621 sys_undelete(l, v, retval) 1622 struct lwp *l; 1623 void *v; 1624 register_t *retval; 1625 { 1626 struct sys_undelete_args /* { 1627 syscallarg(const char *) path; 1628 } */ *uap = v; 1629 struct proc *p = l->l_proc; 1630 int error; 1631 struct nameidata nd; 1632 1633 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1634 SCARG(uap, path), p); 1635 error = namei(&nd); 1636 if (error) 1637 return (error); 1638 1639 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1640 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1641 if (nd.ni_dvp == nd.ni_vp) 1642 vrele(nd.ni_dvp); 1643 else 1644 vput(nd.ni_dvp); 1645 if (nd.ni_vp) 1646 vrele(nd.ni_vp); 1647 return (EEXIST); 1648 } 1649 1650 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1651 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1652 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1653 vput(nd.ni_dvp); 1654 return (error); 1655 } 1656 1657 /* 1658 * Delete a name from the filesystem. 1659 */ 1660 /* ARGSUSED */ 1661 int 1662 sys_unlink(l, v, retval) 1663 struct lwp *l; 1664 void *v; 1665 register_t *retval; 1666 { 1667 struct sys_unlink_args /* { 1668 syscallarg(const char *) path; 1669 } */ *uap = v; 1670 struct proc *p = l->l_proc; 1671 struct vnode *vp; 1672 int error; 1673 struct nameidata nd; 1674 1675 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1676 SCARG(uap, path), p); 1677 if ((error = namei(&nd)) != 0) 1678 return (error); 1679 vp = nd.ni_vp; 1680 1681 /* 1682 * The root of a mounted filesystem cannot be deleted. 1683 */ 1684 if (vp->v_flag & VROOT) { 1685 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1686 if (nd.ni_dvp == vp) 1687 vrele(nd.ni_dvp); 1688 else 1689 vput(nd.ni_dvp); 1690 vput(vp); 1691 error = EBUSY; 1692 goto out; 1693 } 1694 1695 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1696 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1697 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1698 out: 1699 return (error); 1700 } 1701 1702 /* 1703 * Reposition read/write file offset. 1704 */ 1705 int 1706 sys_lseek(l, v, retval) 1707 struct lwp *l; 1708 void *v; 1709 register_t *retval; 1710 { 1711 struct sys_lseek_args /* { 1712 syscallarg(int) fd; 1713 syscallarg(int) pad; 1714 syscallarg(off_t) offset; 1715 syscallarg(int) whence; 1716 } */ *uap = v; 1717 struct proc *p = l->l_proc; 1718 struct ucred *cred = p->p_ucred; 1719 struct filedesc *fdp = p->p_fd; 1720 struct file *fp; 1721 struct vnode *vp; 1722 struct vattr vattr; 1723 off_t newoff; 1724 int error; 1725 1726 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 1727 return (EBADF); 1728 1729 FILE_USE(fp); 1730 1731 vp = (struct vnode *)fp->f_data; 1732 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1733 error = ESPIPE; 1734 goto out; 1735 } 1736 1737 switch (SCARG(uap, whence)) { 1738 case SEEK_CUR: 1739 newoff = fp->f_offset + SCARG(uap, offset); 1740 break; 1741 case SEEK_END: 1742 error = VOP_GETATTR(vp, &vattr, cred, p); 1743 if (error) 1744 goto out; 1745 newoff = SCARG(uap, offset) + vattr.va_size; 1746 break; 1747 case SEEK_SET: 1748 newoff = SCARG(uap, offset); 1749 break; 1750 default: 1751 error = EINVAL; 1752 goto out; 1753 } 1754 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1755 goto out; 1756 1757 *(off_t *)retval = fp->f_offset = newoff; 1758 out: 1759 FILE_UNUSE(fp, p); 1760 return (error); 1761 } 1762 1763 /* 1764 * Positional read system call. 1765 */ 1766 int 1767 sys_pread(l, v, retval) 1768 struct lwp *l; 1769 void *v; 1770 register_t *retval; 1771 { 1772 struct sys_pread_args /* { 1773 syscallarg(int) fd; 1774 syscallarg(void *) buf; 1775 syscallarg(size_t) nbyte; 1776 syscallarg(off_t) offset; 1777 } */ *uap = v; 1778 struct proc *p = l->l_proc; 1779 struct filedesc *fdp = p->p_fd; 1780 struct file *fp; 1781 struct vnode *vp; 1782 off_t offset; 1783 int error, fd = SCARG(uap, fd); 1784 1785 if ((fp = fd_getfile(fdp, fd)) == NULL) 1786 return (EBADF); 1787 1788 if ((fp->f_flag & FREAD) == 0) { 1789 simple_unlock(&fp->f_slock); 1790 return (EBADF); 1791 } 1792 1793 FILE_USE(fp); 1794 1795 vp = (struct vnode *)fp->f_data; 1796 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1797 error = ESPIPE; 1798 goto out; 1799 } 1800 1801 offset = SCARG(uap, offset); 1802 1803 /* 1804 * XXX This works because no file systems actually 1805 * XXX take any action on the seek operation. 1806 */ 1807 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1808 goto out; 1809 1810 /* dofileread() will unuse the descriptor for us */ 1811 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1812 &offset, 0, retval)); 1813 1814 out: 1815 FILE_UNUSE(fp, p); 1816 return (error); 1817 } 1818 1819 /* 1820 * Positional scatter read system call. 1821 */ 1822 int 1823 sys_preadv(l, v, retval) 1824 struct lwp *l; 1825 void *v; 1826 register_t *retval; 1827 { 1828 struct sys_preadv_args /* { 1829 syscallarg(int) fd; 1830 syscallarg(const struct iovec *) iovp; 1831 syscallarg(int) iovcnt; 1832 syscallarg(off_t) offset; 1833 } */ *uap = v; 1834 struct proc *p = l->l_proc; 1835 struct filedesc *fdp = p->p_fd; 1836 struct file *fp; 1837 struct vnode *vp; 1838 off_t offset; 1839 int error, fd = SCARG(uap, fd); 1840 1841 if ((fp = fd_getfile(fdp, fd)) == NULL) 1842 return (EBADF); 1843 1844 if ((fp->f_flag & FREAD) == 0) { 1845 simple_unlock(&fp->f_slock); 1846 return (EBADF); 1847 } 1848 1849 FILE_USE(fp); 1850 1851 vp = (struct vnode *)fp->f_data; 1852 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1853 error = ESPIPE; 1854 goto out; 1855 } 1856 1857 offset = SCARG(uap, offset); 1858 1859 /* 1860 * XXX This works because no file systems actually 1861 * XXX take any action on the seek operation. 1862 */ 1863 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1864 goto out; 1865 1866 /* dofilereadv() will unuse the descriptor for us */ 1867 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1868 &offset, 0, retval)); 1869 1870 out: 1871 FILE_UNUSE(fp, p); 1872 return (error); 1873 } 1874 1875 /* 1876 * Positional write system call. 1877 */ 1878 int 1879 sys_pwrite(l, v, retval) 1880 struct lwp *l; 1881 void *v; 1882 register_t *retval; 1883 { 1884 struct sys_pwrite_args /* { 1885 syscallarg(int) fd; 1886 syscallarg(const void *) buf; 1887 syscallarg(size_t) nbyte; 1888 syscallarg(off_t) offset; 1889 } */ *uap = v; 1890 struct proc *p = l->l_proc; 1891 struct filedesc *fdp = p->p_fd; 1892 struct file *fp; 1893 struct vnode *vp; 1894 off_t offset; 1895 int error, fd = SCARG(uap, fd); 1896 1897 if ((fp = fd_getfile(fdp, fd)) == NULL) 1898 return (EBADF); 1899 1900 if ((fp->f_flag & FWRITE) == 0) { 1901 simple_unlock(&fp->f_slock); 1902 return (EBADF); 1903 } 1904 1905 FILE_USE(fp); 1906 1907 vp = (struct vnode *)fp->f_data; 1908 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1909 error = ESPIPE; 1910 goto out; 1911 } 1912 1913 offset = SCARG(uap, offset); 1914 1915 /* 1916 * XXX This works because no file systems actually 1917 * XXX take any action on the seek operation. 1918 */ 1919 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1920 goto out; 1921 1922 /* dofilewrite() will unuse the descriptor for us */ 1923 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1924 &offset, 0, retval)); 1925 1926 out: 1927 FILE_UNUSE(fp, p); 1928 return (error); 1929 } 1930 1931 /* 1932 * Positional gather write system call. 1933 */ 1934 int 1935 sys_pwritev(l, v, retval) 1936 struct lwp *l; 1937 void *v; 1938 register_t *retval; 1939 { 1940 struct sys_pwritev_args /* { 1941 syscallarg(int) fd; 1942 syscallarg(const struct iovec *) iovp; 1943 syscallarg(int) iovcnt; 1944 syscallarg(off_t) offset; 1945 } */ *uap = v; 1946 struct proc *p = l->l_proc; 1947 struct filedesc *fdp = p->p_fd; 1948 struct file *fp; 1949 struct vnode *vp; 1950 off_t offset; 1951 int error, fd = SCARG(uap, fd); 1952 1953 if ((fp = fd_getfile(fdp, fd)) == NULL) 1954 return (EBADF); 1955 1956 if ((fp->f_flag & FWRITE) == 0) { 1957 simple_unlock(&fp->f_slock); 1958 return (EBADF); 1959 } 1960 1961 FILE_USE(fp); 1962 1963 vp = (struct vnode *)fp->f_data; 1964 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1965 error = ESPIPE; 1966 goto out; 1967 } 1968 1969 offset = SCARG(uap, offset); 1970 1971 /* 1972 * XXX This works because no file systems actually 1973 * XXX take any action on the seek operation. 1974 */ 1975 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1976 goto out; 1977 1978 /* dofilewritev() will unuse the descriptor for us */ 1979 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1980 &offset, 0, retval)); 1981 1982 out: 1983 FILE_UNUSE(fp, p); 1984 return (error); 1985 } 1986 1987 /* 1988 * Check access permissions. 1989 */ 1990 int 1991 sys_access(l, v, retval) 1992 struct lwp *l; 1993 void *v; 1994 register_t *retval; 1995 { 1996 struct sys_access_args /* { 1997 syscallarg(const char *) path; 1998 syscallarg(int) flags; 1999 } */ *uap = v; 2000 struct proc *p = l->l_proc; 2001 struct ucred *cred = crget(); 2002 struct vnode *vp; 2003 int error, flags; 2004 struct nameidata nd; 2005 2006 (void)memcpy(cred, p->p_ucred, sizeof(*cred)); 2007 cred->cr_ref = 1; 2008 cred->cr_uid = p->p_cred->p_ruid; 2009 cred->cr_gid = p->p_cred->p_rgid; 2010 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2011 SCARG(uap, path), p); 2012 /* Override default credentials */ 2013 nd.ni_cnd.cn_cred = cred; 2014 if ((error = namei(&nd)) != 0) 2015 goto out; 2016 vp = nd.ni_vp; 2017 2018 /* Flags == 0 means only check for existence. */ 2019 if (SCARG(uap, flags)) { 2020 flags = 0; 2021 if (SCARG(uap, flags) & R_OK) 2022 flags |= VREAD; 2023 if (SCARG(uap, flags) & W_OK) 2024 flags |= VWRITE; 2025 if (SCARG(uap, flags) & X_OK) 2026 flags |= VEXEC; 2027 2028 error = VOP_ACCESS(vp, flags, cred, p); 2029 if (!error && (flags & VWRITE)) 2030 error = vn_writechk(vp); 2031 } 2032 vput(vp); 2033 out: 2034 crfree(cred); 2035 return (error); 2036 } 2037 2038 /* 2039 * Get file status; this version follows links. 2040 */ 2041 /* ARGSUSED */ 2042 int 2043 sys___stat13(l, v, retval) 2044 struct lwp *l; 2045 void *v; 2046 register_t *retval; 2047 { 2048 struct sys___stat13_args /* { 2049 syscallarg(const char *) path; 2050 syscallarg(struct stat *) ub; 2051 } */ *uap = v; 2052 struct proc *p = l->l_proc; 2053 struct stat sb; 2054 int error; 2055 struct nameidata nd; 2056 2057 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2058 SCARG(uap, path), p); 2059 if ((error = namei(&nd)) != 0) 2060 return (error); 2061 error = vn_stat(nd.ni_vp, &sb, p); 2062 vput(nd.ni_vp); 2063 if (error) 2064 return (error); 2065 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2066 return (error); 2067 } 2068 2069 /* 2070 * Get file status; this version does not follow links. 2071 */ 2072 /* ARGSUSED */ 2073 int 2074 sys___lstat13(l, v, retval) 2075 struct lwp *l; 2076 void *v; 2077 register_t *retval; 2078 { 2079 struct sys___lstat13_args /* { 2080 syscallarg(const char *) path; 2081 syscallarg(struct stat *) ub; 2082 } */ *uap = v; 2083 struct proc *p = l->l_proc; 2084 struct stat sb; 2085 int error; 2086 struct nameidata nd; 2087 2088 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2089 SCARG(uap, path), p); 2090 if ((error = namei(&nd)) != 0) 2091 return (error); 2092 error = vn_stat(nd.ni_vp, &sb, p); 2093 vput(nd.ni_vp); 2094 if (error) 2095 return (error); 2096 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2097 return (error); 2098 } 2099 2100 /* 2101 * Get configurable pathname variables. 2102 */ 2103 /* ARGSUSED */ 2104 int 2105 sys_pathconf(l, v, retval) 2106 struct lwp *l; 2107 void *v; 2108 register_t *retval; 2109 { 2110 struct sys_pathconf_args /* { 2111 syscallarg(const char *) path; 2112 syscallarg(int) name; 2113 } */ *uap = v; 2114 struct proc *p = l->l_proc; 2115 int error; 2116 struct nameidata nd; 2117 2118 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2119 SCARG(uap, path), p); 2120 if ((error = namei(&nd)) != 0) 2121 return (error); 2122 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2123 vput(nd.ni_vp); 2124 return (error); 2125 } 2126 2127 /* 2128 * Return target name of a symbolic link. 2129 */ 2130 /* ARGSUSED */ 2131 int 2132 sys_readlink(l, v, retval) 2133 struct lwp *l; 2134 void *v; 2135 register_t *retval; 2136 { 2137 struct sys_readlink_args /* { 2138 syscallarg(const char *) path; 2139 syscallarg(char *) buf; 2140 syscallarg(size_t) count; 2141 } */ *uap = v; 2142 struct proc *p = l->l_proc; 2143 struct vnode *vp; 2144 struct iovec aiov; 2145 struct uio auio; 2146 int error; 2147 struct nameidata nd; 2148 2149 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2150 SCARG(uap, path), p); 2151 if ((error = namei(&nd)) != 0) 2152 return (error); 2153 vp = nd.ni_vp; 2154 if (vp->v_type != VLNK) 2155 error = EINVAL; 2156 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2157 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2158 aiov.iov_base = SCARG(uap, buf); 2159 aiov.iov_len = SCARG(uap, count); 2160 auio.uio_iov = &aiov; 2161 auio.uio_iovcnt = 1; 2162 auio.uio_offset = 0; 2163 auio.uio_rw = UIO_READ; 2164 auio.uio_segflg = UIO_USERSPACE; 2165 auio.uio_procp = p; 2166 auio.uio_resid = SCARG(uap, count); 2167 error = VOP_READLINK(vp, &auio, p->p_ucred); 2168 } 2169 vput(vp); 2170 *retval = SCARG(uap, count) - auio.uio_resid; 2171 return (error); 2172 } 2173 2174 /* 2175 * Change flags of a file given a path name. 2176 */ 2177 /* ARGSUSED */ 2178 int 2179 sys_chflags(l, v, retval) 2180 struct lwp *l; 2181 void *v; 2182 register_t *retval; 2183 { 2184 struct sys_chflags_args /* { 2185 syscallarg(const char *) path; 2186 syscallarg(u_long) flags; 2187 } */ *uap = v; 2188 struct proc *p = l->l_proc; 2189 struct vnode *vp; 2190 int error; 2191 struct nameidata nd; 2192 2193 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2194 if ((error = namei(&nd)) != 0) 2195 return (error); 2196 vp = nd.ni_vp; 2197 error = change_flags(vp, SCARG(uap, flags), p); 2198 vput(vp); 2199 return (error); 2200 } 2201 2202 /* 2203 * Change flags of a file given a file descriptor. 2204 */ 2205 /* ARGSUSED */ 2206 int 2207 sys_fchflags(l, v, retval) 2208 struct lwp *l; 2209 void *v; 2210 register_t *retval; 2211 { 2212 struct sys_fchflags_args /* { 2213 syscallarg(int) fd; 2214 syscallarg(u_long) flags; 2215 } */ *uap = v; 2216 struct proc *p = l->l_proc; 2217 struct vnode *vp; 2218 struct file *fp; 2219 int error; 2220 2221 /* getvnode() will use the descriptor for us */ 2222 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2223 return (error); 2224 vp = (struct vnode *)fp->f_data; 2225 error = change_flags(vp, SCARG(uap, flags), p); 2226 VOP_UNLOCK(vp, 0); 2227 FILE_UNUSE(fp, p); 2228 return (error); 2229 } 2230 2231 /* 2232 * Change flags of a file given a path name; this version does 2233 * not follow links. 2234 */ 2235 int 2236 sys_lchflags(l, v, retval) 2237 struct lwp *l; 2238 void *v; 2239 register_t *retval; 2240 { 2241 struct sys_lchflags_args /* { 2242 syscallarg(const char *) path; 2243 syscallarg(u_long) flags; 2244 } */ *uap = v; 2245 struct proc *p = l->l_proc; 2246 struct vnode *vp; 2247 int error; 2248 struct nameidata nd; 2249 2250 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2251 if ((error = namei(&nd)) != 0) 2252 return (error); 2253 vp = nd.ni_vp; 2254 error = change_flags(vp, SCARG(uap, flags), p); 2255 vput(vp); 2256 return (error); 2257 } 2258 2259 /* 2260 * Common routine to change flags of a file. 2261 */ 2262 int 2263 change_flags(vp, flags, p) 2264 struct vnode *vp; 2265 u_long flags; 2266 struct proc *p; 2267 { 2268 struct vattr vattr; 2269 int error; 2270 2271 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2272 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2273 /* 2274 * Non-superusers cannot change the flags on devices, even if they 2275 * own them. 2276 */ 2277 if (suser(p->p_ucred, &p->p_acflag) != 0) { 2278 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2279 goto out; 2280 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2281 error = EINVAL; 2282 goto out; 2283 } 2284 } 2285 VATTR_NULL(&vattr); 2286 vattr.va_flags = flags; 2287 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2288 out: 2289 return (error); 2290 } 2291 2292 /* 2293 * Change mode of a file given path name; this version follows links. 2294 */ 2295 /* ARGSUSED */ 2296 int 2297 sys_chmod(l, v, retval) 2298 struct lwp *l; 2299 void *v; 2300 register_t *retval; 2301 { 2302 struct sys_chmod_args /* { 2303 syscallarg(const char *) path; 2304 syscallarg(int) mode; 2305 } */ *uap = v; 2306 struct proc *p = l->l_proc; 2307 int error; 2308 struct nameidata nd; 2309 2310 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2311 if ((error = namei(&nd)) != 0) 2312 return (error); 2313 2314 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2315 2316 vrele(nd.ni_vp); 2317 return (error); 2318 } 2319 2320 /* 2321 * Change mode of a file given a file descriptor. 2322 */ 2323 /* ARGSUSED */ 2324 int 2325 sys_fchmod(l, v, retval) 2326 struct lwp *l; 2327 void *v; 2328 register_t *retval; 2329 { 2330 struct sys_fchmod_args /* { 2331 syscallarg(int) fd; 2332 syscallarg(int) mode; 2333 } */ *uap = v; 2334 struct proc *p = l->l_proc; 2335 struct file *fp; 2336 int error; 2337 2338 /* getvnode() will use the descriptor for us */ 2339 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2340 return (error); 2341 2342 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2343 FILE_UNUSE(fp, p); 2344 return (error); 2345 } 2346 2347 /* 2348 * Change mode of a file given path name; this version does not follow links. 2349 */ 2350 /* ARGSUSED */ 2351 int 2352 sys_lchmod(l, v, retval) 2353 struct lwp *l; 2354 void *v; 2355 register_t *retval; 2356 { 2357 struct sys_lchmod_args /* { 2358 syscallarg(const char *) path; 2359 syscallarg(int) mode; 2360 } */ *uap = v; 2361 struct proc *p = l->l_proc; 2362 int error; 2363 struct nameidata nd; 2364 2365 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2366 if ((error = namei(&nd)) != 0) 2367 return (error); 2368 2369 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2370 2371 vrele(nd.ni_vp); 2372 return (error); 2373 } 2374 2375 /* 2376 * Common routine to set mode given a vnode. 2377 */ 2378 static int 2379 change_mode(vp, mode, p) 2380 struct vnode *vp; 2381 int mode; 2382 struct proc *p; 2383 { 2384 struct vattr vattr; 2385 int error; 2386 2387 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2388 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2389 VATTR_NULL(&vattr); 2390 vattr.va_mode = mode & ALLPERMS; 2391 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2392 VOP_UNLOCK(vp, 0); 2393 return (error); 2394 } 2395 2396 /* 2397 * Set ownership given a path name; this version follows links. 2398 */ 2399 /* ARGSUSED */ 2400 int 2401 sys_chown(l, v, retval) 2402 struct lwp *l; 2403 void *v; 2404 register_t *retval; 2405 { 2406 struct sys_chown_args /* { 2407 syscallarg(const char *) path; 2408 syscallarg(uid_t) uid; 2409 syscallarg(gid_t) gid; 2410 } */ *uap = v; 2411 struct proc *p = l->l_proc; 2412 int error; 2413 struct nameidata nd; 2414 2415 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2416 if ((error = namei(&nd)) != 0) 2417 return (error); 2418 2419 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2420 2421 vrele(nd.ni_vp); 2422 return (error); 2423 } 2424 2425 /* 2426 * Set ownership given a path name; this version follows links. 2427 * Provides POSIX semantics. 2428 */ 2429 /* ARGSUSED */ 2430 int 2431 sys___posix_chown(l, v, retval) 2432 struct lwp *l; 2433 void *v; 2434 register_t *retval; 2435 { 2436 struct sys_chown_args /* { 2437 syscallarg(const char *) path; 2438 syscallarg(uid_t) uid; 2439 syscallarg(gid_t) gid; 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_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2450 2451 vrele(nd.ni_vp); 2452 return (error); 2453 } 2454 2455 /* 2456 * Set ownership given a file descriptor. 2457 */ 2458 /* ARGSUSED */ 2459 int 2460 sys_fchown(l, v, retval) 2461 struct lwp *l; 2462 void *v; 2463 register_t *retval; 2464 { 2465 struct sys_fchown_args /* { 2466 syscallarg(int) fd; 2467 syscallarg(uid_t) uid; 2468 syscallarg(gid_t) gid; 2469 } */ *uap = v; 2470 struct proc *p = l->l_proc; 2471 int error; 2472 struct file *fp; 2473 2474 /* getvnode() will use the descriptor for us */ 2475 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2476 return (error); 2477 2478 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2479 SCARG(uap, gid), p, 0); 2480 FILE_UNUSE(fp, p); 2481 return (error); 2482 } 2483 2484 /* 2485 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2486 */ 2487 /* ARGSUSED */ 2488 int 2489 sys___posix_fchown(l, v, retval) 2490 struct lwp *l; 2491 void *v; 2492 register_t *retval; 2493 { 2494 struct sys_fchown_args /* { 2495 syscallarg(int) fd; 2496 syscallarg(uid_t) uid; 2497 syscallarg(gid_t) gid; 2498 } */ *uap = v; 2499 struct proc *p = l->l_proc; 2500 int error; 2501 struct file *fp; 2502 2503 /* getvnode() will use the descriptor for us */ 2504 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2505 return (error); 2506 2507 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2508 SCARG(uap, gid), p, 1); 2509 FILE_UNUSE(fp, p); 2510 return (error); 2511 } 2512 2513 /* 2514 * Set ownership given a path name; this version does not follow links. 2515 */ 2516 /* ARGSUSED */ 2517 int 2518 sys_lchown(l, v, retval) 2519 struct lwp *l; 2520 void *v; 2521 register_t *retval; 2522 { 2523 struct sys_lchown_args /* { 2524 syscallarg(const char *) path; 2525 syscallarg(uid_t) uid; 2526 syscallarg(gid_t) gid; 2527 } */ *uap = v; 2528 struct proc *p = l->l_proc; 2529 int error; 2530 struct nameidata nd; 2531 2532 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2533 if ((error = namei(&nd)) != 0) 2534 return (error); 2535 2536 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2537 2538 vrele(nd.ni_vp); 2539 return (error); 2540 } 2541 2542 /* 2543 * Set ownership given a path name; this version does not follow links. 2544 * Provides POSIX/XPG semantics. 2545 */ 2546 /* ARGSUSED */ 2547 int 2548 sys___posix_lchown(l, v, retval) 2549 struct lwp *l; 2550 void *v; 2551 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, 1); 2567 2568 vrele(nd.ni_vp); 2569 return (error); 2570 } 2571 2572 /* 2573 * Common routine to set ownership given a vnode. 2574 */ 2575 static int 2576 change_owner(vp, uid, gid, p, posix_semantics) 2577 struct vnode *vp; 2578 uid_t uid; 2579 gid_t gid; 2580 struct proc *p; 2581 int posix_semantics; 2582 { 2583 struct vattr vattr; 2584 mode_t newmode; 2585 int error; 2586 2587 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2588 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2589 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2590 goto out; 2591 2592 #define CHANGED(x) ((int)(x) != -1) 2593 newmode = vattr.va_mode; 2594 if (posix_semantics) { 2595 /* 2596 * POSIX/XPG semantics: if the caller is not the super-user, 2597 * clear set-user-id and set-group-id bits. Both POSIX and 2598 * the XPG consider the behaviour for calls by the super-user 2599 * implementation-defined; we leave the set-user-id and set- 2600 * group-id settings intact in that case. 2601 */ 2602 if (suser(p->p_ucred, NULL) != 0) 2603 newmode &= ~(S_ISUID | S_ISGID); 2604 } else { 2605 /* 2606 * NetBSD semantics: when changing owner and/or group, 2607 * clear the respective bit(s). 2608 */ 2609 if (CHANGED(uid)) 2610 newmode &= ~S_ISUID; 2611 if (CHANGED(gid)) 2612 newmode &= ~S_ISGID; 2613 } 2614 /* Update va_mode iff altered. */ 2615 if (vattr.va_mode == newmode) 2616 newmode = VNOVAL; 2617 2618 VATTR_NULL(&vattr); 2619 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2620 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2621 vattr.va_mode = newmode; 2622 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2623 #undef CHANGED 2624 2625 out: 2626 VOP_UNLOCK(vp, 0); 2627 return (error); 2628 } 2629 2630 /* 2631 * Set the access and modification times given a path name; this 2632 * version follows links. 2633 */ 2634 /* ARGSUSED */ 2635 int 2636 sys_utimes(l, v, retval) 2637 struct lwp *l; 2638 void *v; 2639 register_t *retval; 2640 { 2641 struct sys_utimes_args /* { 2642 syscallarg(const char *) path; 2643 syscallarg(const struct timeval *) tptr; 2644 } */ *uap = v; 2645 struct proc *p = l->l_proc; 2646 int error; 2647 struct nameidata nd; 2648 2649 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2650 if ((error = namei(&nd)) != 0) 2651 return (error); 2652 2653 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2654 2655 vrele(nd.ni_vp); 2656 return (error); 2657 } 2658 2659 /* 2660 * Set the access and modification times given a file descriptor. 2661 */ 2662 /* ARGSUSED */ 2663 int 2664 sys_futimes(l, v, retval) 2665 struct lwp *l; 2666 void *v; 2667 register_t *retval; 2668 { 2669 struct sys_futimes_args /* { 2670 syscallarg(int) fd; 2671 syscallarg(const struct timeval *) tptr; 2672 } */ *uap = v; 2673 struct proc *p = l->l_proc; 2674 int error; 2675 struct file *fp; 2676 2677 /* getvnode() will use the descriptor for us */ 2678 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2679 return (error); 2680 2681 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2682 FILE_UNUSE(fp, p); 2683 return (error); 2684 } 2685 2686 /* 2687 * Set the access and modification times given a path name; this 2688 * version does not follow links. 2689 */ 2690 /* ARGSUSED */ 2691 int 2692 sys_lutimes(l, v, retval) 2693 struct lwp *l; 2694 void *v; 2695 register_t *retval; 2696 { 2697 struct sys_lutimes_args /* { 2698 syscallarg(const char *) path; 2699 syscallarg(const struct timeval *) tptr; 2700 } */ *uap = v; 2701 struct proc *p = l->l_proc; 2702 int error; 2703 struct nameidata nd; 2704 2705 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2706 if ((error = namei(&nd)) != 0) 2707 return (error); 2708 2709 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2710 2711 vrele(nd.ni_vp); 2712 return (error); 2713 } 2714 2715 /* 2716 * Common routine to set access and modification times given a vnode. 2717 */ 2718 static int 2719 change_utimes(vp, tptr, p) 2720 struct vnode *vp; 2721 const struct timeval *tptr; 2722 struct proc *p; 2723 { 2724 struct timeval tv[2]; 2725 struct vattr vattr; 2726 int error; 2727 2728 VATTR_NULL(&vattr); 2729 if (tptr == NULL) { 2730 microtime(&tv[0]); 2731 tv[1] = tv[0]; 2732 vattr.va_vaflags |= VA_UTIMES_NULL; 2733 } else { 2734 error = copyin(tptr, tv, sizeof(tv)); 2735 if (error) 2736 return (error); 2737 } 2738 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2739 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2740 vattr.va_atime.tv_sec = tv[0].tv_sec; 2741 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2742 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2743 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2744 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2745 VOP_UNLOCK(vp, 0); 2746 return (error); 2747 } 2748 2749 /* 2750 * Truncate a file given its path name. 2751 */ 2752 /* ARGSUSED */ 2753 int 2754 sys_truncate(l, v, retval) 2755 struct lwp *l; 2756 void *v; 2757 register_t *retval; 2758 { 2759 struct sys_truncate_args /* { 2760 syscallarg(const char *) path; 2761 syscallarg(int) pad; 2762 syscallarg(off_t) length; 2763 } */ *uap = v; 2764 struct proc *p = l->l_proc; 2765 struct vnode *vp; 2766 struct vattr vattr; 2767 int error; 2768 struct nameidata nd; 2769 2770 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2771 if ((error = namei(&nd)) != 0) 2772 return (error); 2773 vp = nd.ni_vp; 2774 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2775 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2776 if (vp->v_type == VDIR) 2777 error = EISDIR; 2778 else if ((error = vn_writechk(vp)) == 0 && 2779 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2780 VATTR_NULL(&vattr); 2781 vattr.va_size = SCARG(uap, length); 2782 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2783 } 2784 vput(vp); 2785 return (error); 2786 } 2787 2788 /* 2789 * Truncate a file given a file descriptor. 2790 */ 2791 /* ARGSUSED */ 2792 int 2793 sys_ftruncate(l, v, retval) 2794 struct lwp *l; 2795 void *v; 2796 register_t *retval; 2797 { 2798 struct sys_ftruncate_args /* { 2799 syscallarg(int) fd; 2800 syscallarg(int) pad; 2801 syscallarg(off_t) length; 2802 } */ *uap = v; 2803 struct proc *p = l->l_proc; 2804 struct vattr vattr; 2805 struct vnode *vp; 2806 struct file *fp; 2807 int error; 2808 2809 /* getvnode() will use the descriptor for us */ 2810 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2811 return (error); 2812 if ((fp->f_flag & FWRITE) == 0) { 2813 error = EINVAL; 2814 goto out; 2815 } 2816 vp = (struct vnode *)fp->f_data; 2817 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2818 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2819 if (vp->v_type == VDIR) 2820 error = EISDIR; 2821 else if ((error = vn_writechk(vp)) == 0) { 2822 VATTR_NULL(&vattr); 2823 vattr.va_size = SCARG(uap, length); 2824 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2825 } 2826 VOP_UNLOCK(vp, 0); 2827 out: 2828 FILE_UNUSE(fp, p); 2829 return (error); 2830 } 2831 2832 /* 2833 * Sync an open file. 2834 */ 2835 /* ARGSUSED */ 2836 int 2837 sys_fsync(l, v, retval) 2838 struct lwp *l; 2839 void *v; 2840 register_t *retval; 2841 { 2842 struct sys_fsync_args /* { 2843 syscallarg(int) fd; 2844 } */ *uap = v; 2845 struct proc *p = l->l_proc; 2846 struct vnode *vp; 2847 struct file *fp; 2848 int error; 2849 2850 /* getvnode() will use the descriptor for us */ 2851 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2852 return (error); 2853 vp = (struct vnode *)fp->f_data; 2854 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2855 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); 2856 if (error == 0 && bioops.io_fsync != NULL && 2857 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2858 (*bioops.io_fsync)(vp); 2859 VOP_UNLOCK(vp, 0); 2860 FILE_UNUSE(fp, p); 2861 return (error); 2862 } 2863 2864 /* 2865 * Sync the data of an open file. 2866 */ 2867 /* ARGSUSED */ 2868 int 2869 sys_fdatasync(l, v, retval) 2870 struct lwp *l; 2871 void *v; 2872 register_t *retval; 2873 { 2874 struct sys_fdatasync_args /* { 2875 syscallarg(int) fd; 2876 } */ *uap = v; 2877 struct proc *p = l->l_proc; 2878 struct vnode *vp; 2879 struct file *fp; 2880 int error; 2881 2882 /* getvnode() will use the descriptor for us */ 2883 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2884 return (error); 2885 vp = (struct vnode *)fp->f_data; 2886 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2887 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); 2888 VOP_UNLOCK(vp, 0); 2889 FILE_UNUSE(fp, p); 2890 return (error); 2891 } 2892 2893 /* 2894 * Rename files, (standard) BSD semantics frontend. 2895 */ 2896 /* ARGSUSED */ 2897 int 2898 sys_rename(l, v, retval) 2899 struct lwp *l; 2900 void *v; 2901 register_t *retval; 2902 { 2903 struct sys_rename_args /* { 2904 syscallarg(const char *) from; 2905 syscallarg(const char *) to; 2906 } */ *uap = v; 2907 struct proc *p = l->l_proc; 2908 2909 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2910 } 2911 2912 /* 2913 * Rename files, POSIX semantics frontend. 2914 */ 2915 /* ARGSUSED */ 2916 int 2917 sys___posix_rename(l, v, retval) 2918 struct lwp *l; 2919 void *v; 2920 register_t *retval; 2921 { 2922 struct sys___posix_rename_args /* { 2923 syscallarg(const char *) from; 2924 syscallarg(const char *) to; 2925 } */ *uap = v; 2926 struct proc *p = l->l_proc; 2927 2928 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2929 } 2930 2931 /* 2932 * Rename files. Source and destination must either both be directories, 2933 * or both not be directories. If target is a directory, it must be empty. 2934 * If `from' and `to' refer to the same object, the value of the `retain' 2935 * argument is used to determine whether `from' will be 2936 * 2937 * (retain == 0) deleted unless `from' and `to' refer to the same 2938 * object in the file system's name space (BSD). 2939 * (retain == 1) always retained (POSIX). 2940 */ 2941 static int 2942 rename_files(from, to, p, retain) 2943 const char *from, *to; 2944 struct proc *p; 2945 int retain; 2946 { 2947 struct vnode *tvp, *fvp, *tdvp; 2948 struct nameidata fromnd, tond; 2949 int error; 2950 2951 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2952 from, p); 2953 if ((error = namei(&fromnd)) != 0) 2954 return (error); 2955 fvp = fromnd.ni_vp; 2956 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2957 UIO_USERSPACE, to, p); 2958 if ((error = namei(&tond)) != 0) { 2959 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2960 vrele(fromnd.ni_dvp); 2961 vrele(fvp); 2962 goto out1; 2963 } 2964 tdvp = tond.ni_dvp; 2965 tvp = tond.ni_vp; 2966 2967 if (tvp != NULL) { 2968 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2969 error = ENOTDIR; 2970 goto out; 2971 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2972 error = EISDIR; 2973 goto out; 2974 } 2975 } 2976 2977 if (fvp == tdvp) 2978 error = EINVAL; 2979 2980 /* 2981 * Source and destination refer to the same object. 2982 */ 2983 if (fvp == tvp) { 2984 if (retain) 2985 error = -1; 2986 else if (fromnd.ni_dvp == tdvp && 2987 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2988 !memcmp(fromnd.ni_cnd.cn_nameptr, 2989 tond.ni_cnd.cn_nameptr, 2990 fromnd.ni_cnd.cn_namelen)) 2991 error = -1; 2992 } 2993 2994 out: 2995 if (!error) { 2996 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2997 if (fromnd.ni_dvp != tdvp) 2998 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2999 if (tvp) { 3000 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 3001 } 3002 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3003 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3004 } else { 3005 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3006 if (tdvp == tvp) 3007 vrele(tdvp); 3008 else 3009 vput(tdvp); 3010 if (tvp) 3011 vput(tvp); 3012 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3013 vrele(fromnd.ni_dvp); 3014 vrele(fvp); 3015 } 3016 vrele(tond.ni_startdir); 3017 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3018 out1: 3019 if (fromnd.ni_startdir) 3020 vrele(fromnd.ni_startdir); 3021 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3022 return (error == -1 ? 0 : error); 3023 } 3024 3025 /* 3026 * Make a directory file. 3027 */ 3028 /* ARGSUSED */ 3029 int 3030 sys_mkdir(l, v, retval) 3031 struct lwp *l; 3032 void *v; 3033 register_t *retval; 3034 { 3035 struct sys_mkdir_args /* { 3036 syscallarg(const char *) path; 3037 syscallarg(int) mode; 3038 } */ *uap = v; 3039 struct proc *p = l->l_proc; 3040 struct vnode *vp; 3041 struct vattr vattr; 3042 int error; 3043 struct nameidata nd; 3044 3045 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 3046 if ((error = namei(&nd)) != 0) 3047 return (error); 3048 vp = nd.ni_vp; 3049 if (vp != NULL) { 3050 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3051 if (nd.ni_dvp == vp) 3052 vrele(nd.ni_dvp); 3053 else 3054 vput(nd.ni_dvp); 3055 vrele(vp); 3056 return (EEXIST); 3057 } 3058 VATTR_NULL(&vattr); 3059 vattr.va_type = VDIR; 3060 vattr.va_mode = 3061 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3062 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3063 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3064 if (!error) 3065 vput(nd.ni_vp); 3066 return (error); 3067 } 3068 3069 /* 3070 * Remove a directory file. 3071 */ 3072 /* ARGSUSED */ 3073 int 3074 sys_rmdir(l, v, retval) 3075 struct lwp *l; 3076 void *v; 3077 register_t *retval; 3078 { 3079 struct sys_rmdir_args /* { 3080 syscallarg(const char *) path; 3081 } */ *uap = v; 3082 struct proc *p = l->l_proc; 3083 struct vnode *vp; 3084 int error; 3085 struct nameidata nd; 3086 3087 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3088 SCARG(uap, path), p); 3089 if ((error = namei(&nd)) != 0) 3090 return (error); 3091 vp = nd.ni_vp; 3092 if (vp->v_type != VDIR) { 3093 error = ENOTDIR; 3094 goto out; 3095 } 3096 /* 3097 * No rmdir "." please. 3098 */ 3099 if (nd.ni_dvp == vp) { 3100 error = EINVAL; 3101 goto out; 3102 } 3103 /* 3104 * The root of a mounted filesystem cannot be deleted. 3105 */ 3106 if (vp->v_flag & VROOT) 3107 error = EBUSY; 3108 out: 3109 if (!error) { 3110 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 3111 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 3112 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3113 } else { 3114 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3115 if (nd.ni_dvp == vp) 3116 vrele(nd.ni_dvp); 3117 else 3118 vput(nd.ni_dvp); 3119 vput(vp); 3120 } 3121 return (error); 3122 } 3123 3124 /* 3125 * Read a block of directory entries in a file system independent format. 3126 */ 3127 int 3128 sys_getdents(l, v, retval) 3129 struct lwp *l; 3130 void *v; 3131 register_t *retval; 3132 { 3133 struct sys_getdents_args /* { 3134 syscallarg(int) fd; 3135 syscallarg(char *) buf; 3136 syscallarg(size_t) count; 3137 } */ *uap = v; 3138 struct proc *p = l->l_proc; 3139 struct file *fp; 3140 int error, done; 3141 3142 /* getvnode() will use the descriptor for us */ 3143 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3144 return (error); 3145 if ((fp->f_flag & FREAD) == 0) { 3146 error = EBADF; 3147 goto out; 3148 } 3149 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3150 SCARG(uap, count), &done, p, 0, 0); 3151 *retval = done; 3152 out: 3153 FILE_UNUSE(fp, p); 3154 return (error); 3155 } 3156 3157 /* 3158 * Set the mode mask for creation of filesystem nodes. 3159 */ 3160 int 3161 sys_umask(l, v, retval) 3162 struct lwp *l; 3163 void *v; 3164 register_t *retval; 3165 { 3166 struct sys_umask_args /* { 3167 syscallarg(mode_t) newmask; 3168 } */ *uap = v; 3169 struct proc *p = l->l_proc; 3170 struct cwdinfo *cwdi; 3171 3172 cwdi = p->p_cwdi; 3173 *retval = cwdi->cwdi_cmask; 3174 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3175 return (0); 3176 } 3177 3178 /* 3179 * Void all references to file by ripping underlying filesystem 3180 * away from vnode. 3181 */ 3182 /* ARGSUSED */ 3183 int 3184 sys_revoke(l, v, retval) 3185 struct lwp *l; 3186 void *v; 3187 register_t *retval; 3188 { 3189 struct sys_revoke_args /* { 3190 syscallarg(const char *) path; 3191 } */ *uap = v; 3192 struct proc *p = l->l_proc; 3193 struct vnode *vp; 3194 struct vattr vattr; 3195 int error; 3196 struct nameidata nd; 3197 3198 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3199 if ((error = namei(&nd)) != 0) 3200 return (error); 3201 vp = nd.ni_vp; 3202 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3203 goto out; 3204 if (p->p_ucred->cr_uid != vattr.va_uid && 3205 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3206 goto out; 3207 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3208 VOP_REVOKE(vp, REVOKEALL); 3209 out: 3210 vrele(vp); 3211 return (error); 3212 } 3213 3214 /* 3215 * Convert a user file descriptor to a kernel file entry. 3216 */ 3217 int 3218 getvnode(fdp, fd, fpp) 3219 struct filedesc *fdp; 3220 int fd; 3221 struct file **fpp; 3222 { 3223 struct vnode *vp; 3224 struct file *fp; 3225 3226 if ((fp = fd_getfile(fdp, fd)) == NULL) 3227 return (EBADF); 3228 3229 FILE_USE(fp); 3230 3231 if (fp->f_type != DTYPE_VNODE) { 3232 FILE_UNUSE(fp, NULL); 3233 return (EINVAL); 3234 } 3235 3236 vp = (struct vnode *)fp->f_data; 3237 if (vp->v_type == VBAD) { 3238 FILE_UNUSE(fp, NULL); 3239 return (EBADF); 3240 } 3241 3242 *fpp = fp; 3243 return (0); 3244 } 3245
Indexes created Tue Sep 23 07:09:52 GMT 2025