1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 39 * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $ 40 * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.55 2005/01/31 17:20:48 joerg Exp $ 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/sysent.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/sysproto.h> 51 #include <sys/filedesc.h> 52 #include <sys/kernel.h> 53 #include <sys/fcntl.h> 54 #include <sys/file.h> 55 #include <sys/linker.h> 56 #include <sys/stat.h> 57 #include <sys/unistd.h> 58 #include <sys/vnode.h> 59 #include <sys/proc.h> 60 #include <sys/namei.h> 61 #include <sys/nlookup.h> 62 #include <sys/dirent.h> 63 #include <sys/extattr.h> 64 #include <sys/kern_syscall.h> 65 66 #include <machine/limits.h> 67 #include <vfs/union/union.h> 68 #include <sys/sysctl.h> 69 #include <vm/vm.h> 70 #include <vm/vm_object.h> 71 #include <vm/vm_zone.h> 72 #include <vm/vm_page.h> 73 74 #include <sys/file2.h> 75 76 static int checkvp_chdir (struct vnode *vn, struct thread *td); 77 static void checkdirs (struct vnode *olddp, struct namecache *ncp); 78 static int chroot_refuse_vdir_fds (struct filedesc *fdp); 79 static int getutimes (const struct timeval *, struct timespec *); 80 static int setfown (struct vnode *, uid_t, gid_t); 81 static int setfmode (struct vnode *, int); 82 static int setfflags (struct vnode *, int); 83 static int setutimes (struct vnode *, const struct timespec *, int); 84 static int usermount = 0; /* if 1, non-root can mount fs. */ 85 86 int (*union_dircheckp) (struct thread *, struct vnode **, struct file *); 87 88 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); 89 90 /* 91 * Virtual File System System Calls 92 */ 93 94 /* 95 * Mount a file system. 96 */ 97 /* 98 * mount_args(char *type, char *path, int flags, caddr_t data) 99 */ 100 /* ARGSUSED */ 101 int 102 mount(struct mount_args *uap) 103 { 104 struct thread *td = curthread; 105 struct proc *p = td->td_proc; 106 struct vnode *vp; 107 struct namecache *ncp; 108 struct mount *mp; 109 struct vfsconf *vfsp; 110 int error, flag = 0, flag2 = 0; 111 struct vattr va; 112 struct nlookupdata nd; 113 char fstypename[MFSNAMELEN]; 114 lwkt_tokref ilock; 115 struct nlcomponent nlc; 116 117 KKASSERT(p); 118 if (p->p_ucred->cr_prison != NULL) 119 return (EPERM); 120 if (usermount == 0 && (error = suser(td))) 121 return (error); 122 /* 123 * Do not allow NFS export by non-root users. 124 */ 125 if (SCARG(uap, flags) & MNT_EXPORTED) { 126 error = suser(td); 127 if (error) 128 return (error); 129 } 130 /* 131 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users 132 */ 133 if (suser(td)) 134 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 135 136 /* 137 * Lookup the requested path and extract the ncp and vnode. 138 */ 139 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 140 if (error == 0) { 141 if ((error = nlookup(&nd)) == 0) { 142 if (nd.nl_ncp->nc_vp == NULL) 143 error = ENOENT; 144 } 145 } 146 if (error) { 147 nlookup_done(&nd); 148 return (error); 149 } 150 151 /* 152 * Extract the locked+refd ncp and cleanup the nd structure 153 */ 154 ncp = nd.nl_ncp; 155 nd.nl_ncp = NULL; 156 nlookup_done(&nd); 157 158 /* 159 * now we have the locked ref'd ncp and unreferenced vnode. 160 */ 161 vp = ncp->nc_vp; 162 if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0) { 163 cache_put(ncp); 164 return (error); 165 } 166 cache_unlock(ncp); 167 168 /* 169 * Now we have an unlocked ref'd ncp and a locked ref'd vp 170 */ 171 if (SCARG(uap, flags) & MNT_UPDATE) { 172 if ((vp->v_flag & VROOT) == 0) { 173 cache_drop(ncp); 174 vput(vp); 175 return (EINVAL); 176 } 177 mp = vp->v_mount; 178 flag = mp->mnt_flag; 179 flag2 = mp->mnt_kern_flag; 180 /* 181 * We only allow the filesystem to be reloaded if it 182 * is currently mounted read-only. 183 */ 184 if ((SCARG(uap, flags) & MNT_RELOAD) && 185 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 186 cache_drop(ncp); 187 vput(vp); 188 return (EOPNOTSUPP); /* Needs translation */ 189 } 190 /* 191 * Only root, or the user that did the original mount is 192 * permitted to update it. 193 */ 194 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 195 (error = suser(td))) { 196 cache_drop(ncp); 197 vput(vp); 198 return (error); 199 } 200 if (vfs_busy(mp, LK_NOWAIT, NULL, td)) { 201 cache_drop(ncp); 202 vput(vp); 203 return (EBUSY); 204 } 205 if ((vp->v_flag & VMOUNT) != 0 || 206 vp->v_mountedhere != NULL) { 207 cache_drop(ncp); 208 vfs_unbusy(mp, td); 209 vput(vp); 210 return (EBUSY); 211 } 212 vp->v_flag |= VMOUNT; 213 mp->mnt_flag |= 214 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 215 VOP_UNLOCK(vp, 0, td); 216 goto update; 217 } 218 /* 219 * If the user is not root, ensure that they own the directory 220 * onto which we are attempting to mount. 221 */ 222 if ((error = VOP_GETATTR(vp, &va, td)) || 223 (va.va_uid != p->p_ucred->cr_uid && 224 (error = suser(td)))) { 225 cache_drop(ncp); 226 vput(vp); 227 return (error); 228 } 229 if ((error = vinvalbuf(vp, V_SAVE, td, 0, 0)) != 0) { 230 cache_drop(ncp); 231 vput(vp); 232 return (error); 233 } 234 if (vp->v_type != VDIR) { 235 cache_drop(ncp); 236 vput(vp); 237 return (ENOTDIR); 238 } 239 if ((error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) != 0) { 240 cache_drop(ncp); 241 vput(vp); 242 return (error); 243 } 244 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 245 if (!strcmp(vfsp->vfc_name, fstypename)) 246 break; 247 } 248 if (vfsp == NULL) { 249 linker_file_t lf; 250 251 /* Only load modules for root (very important!) */ 252 if ((error = suser(td)) != 0) { 253 cache_drop(ncp); 254 vput(vp); 255 return error; 256 } 257 error = linker_load_file(fstypename, &lf); 258 if (error || lf == NULL) { 259 cache_drop(ncp); 260 vput(vp); 261 if (lf == NULL) 262 error = ENODEV; 263 return error; 264 } 265 lf->userrefs++; 266 /* lookup again, see if the VFS was loaded */ 267 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 268 if (!strcmp(vfsp->vfc_name, fstypename)) 269 break; 270 } 271 if (vfsp == NULL) { 272 lf->userrefs--; 273 linker_file_unload(lf); 274 cache_drop(ncp); 275 vput(vp); 276 return (ENODEV); 277 } 278 } 279 if ((vp->v_flag & VMOUNT) != 0 || 280 vp->v_mountedhere != NULL) { 281 cache_drop(ncp); 282 vput(vp); 283 return (EBUSY); 284 } 285 vp->v_flag |= VMOUNT; 286 287 /* 288 * Allocate and initialize the filesystem. 289 */ 290 mp = malloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK); 291 TAILQ_INIT(&mp->mnt_nvnodelist); 292 TAILQ_INIT(&mp->mnt_reservedvnlist); 293 TAILQ_INIT(&mp->mnt_jlist); 294 mp->mnt_nvnodelistsize = 0; 295 lockinit(&mp->mnt_lock, 0, "vfslock", 0, LK_NOPAUSE); 296 vfs_busy(mp, LK_NOWAIT, NULL, td); 297 mp->mnt_op = vfsp->vfc_vfsops; 298 mp->mnt_vfc = vfsp; 299 vfsp->vfc_refcount++; 300 mp->mnt_stat.f_type = vfsp->vfc_typenum; 301 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 302 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 303 mp->mnt_vnodecovered = vp; 304 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 305 mp->mnt_iosize_max = DFLTPHYS; 306 VOP_UNLOCK(vp, 0, td); 307 update: 308 /* 309 * Set the mount level flags. 310 */ 311 if (SCARG(uap, flags) & MNT_RDONLY) 312 mp->mnt_flag |= MNT_RDONLY; 313 else if (mp->mnt_flag & MNT_RDONLY) 314 mp->mnt_kern_flag |= MNTK_WANTRDWR; 315 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 316 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | 317 MNT_NOSYMFOLLOW | MNT_IGNORE | 318 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); 319 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 320 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | 321 MNT_NOSYMFOLLOW | MNT_IGNORE | 322 MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); 323 /* 324 * Mount the filesystem. 325 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 326 * get. 327 */ 328 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), td); 329 if (mp->mnt_flag & MNT_UPDATE) { 330 if (mp->mnt_kern_flag & MNTK_WANTRDWR) 331 mp->mnt_flag &= ~MNT_RDONLY; 332 mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); 333 mp->mnt_kern_flag &=~ MNTK_WANTRDWR; 334 if (error) { 335 mp->mnt_flag = flag; 336 mp->mnt_kern_flag = flag2; 337 } 338 vfs_unbusy(mp, td); 339 vp->v_flag &= ~VMOUNT; 340 vrele(vp); 341 cache_drop(ncp); 342 return (error); 343 } 344 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 345 /* 346 * Put the new filesystem on the mount list after root. The mount 347 * point gets its own mnt_ncp which is a special ncp linking the 348 * vnode-under to the root of the new mount. The lookup code 349 * detects the mount point going forward and detects the special 350 * mnt_ncp via NCP_MOUNTPT going backwards. 351 * 352 * It is not necessary to invalidate or purge the vnode underneath 353 * because elements under the mount will be given their own glue 354 * namecache record. 355 */ 356 if (!error) { 357 nlc.nlc_nameptr = ""; 358 nlc.nlc_namelen = 0; 359 mp->mnt_ncp = cache_nlookup(ncp, &nlc); 360 cache_setunresolved(mp->mnt_ncp); 361 mp->mnt_ncp->nc_flag |= NCF_MOUNTPT; 362 mp->mnt_ncp->nc_mount = mp; 363 cache_drop(ncp); 364 /* XXX get the root of the fs and cache_setvp(mnt_ncp...) */ 365 vp->v_flag &= ~VMOUNT; 366 vp->v_mountedhere = mp; 367 lwkt_gettoken(&ilock, &mountlist_token); 368 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 369 lwkt_reltoken(&ilock); 370 checkdirs(vp, mp->mnt_ncp); 371 cache_unlock(mp->mnt_ncp); /* leave ref intact */ 372 VOP_UNLOCK(vp, 0, td); 373 error = vfs_allocate_syncvnode(mp); 374 vfs_unbusy(mp, td); 375 if ((error = VFS_START(mp, 0, td)) != 0) 376 vrele(vp); 377 } else { 378 vfs_rm_vnodeops(&mp->mnt_vn_coherency_ops); 379 vfs_rm_vnodeops(&mp->mnt_vn_journal_ops); 380 vfs_rm_vnodeops(&mp->mnt_vn_norm_ops); 381 vfs_rm_vnodeops(&mp->mnt_vn_spec_ops); 382 vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops); 383 vp->v_flag &= ~VMOUNT; 384 mp->mnt_vfc->vfc_refcount--; 385 vfs_unbusy(mp, td); 386 free(mp, M_MOUNT); 387 cache_drop(ncp); 388 vput(vp); 389 } 390 return (error); 391 } 392 393 /* 394 * Scan all active processes to see if any of them have a current 395 * or root directory onto which the new filesystem has just been 396 * mounted. If so, replace them with the new mount point. 397 * 398 * The passed ncp is ref'd and locked (from the mount code) and 399 * must be associated with the vnode representing the root of the 400 * mount point. 401 */ 402 static void 403 checkdirs(struct vnode *olddp, struct namecache *ncp) 404 { 405 struct filedesc *fdp; 406 struct vnode *newdp; 407 struct mount *mp; 408 struct proc *p; 409 410 if (olddp->v_usecount == 1) 411 return; 412 mp = olddp->v_mountedhere; 413 if (VFS_ROOT(mp, &newdp)) 414 panic("mount: lost mount"); 415 cache_setvp(ncp, newdp); 416 417 if (rootvnode == olddp) { 418 vref(newdp); 419 vfs_cache_setroot(newdp, cache_hold(ncp)); 420 } 421 422 FOREACH_PROC_IN_SYSTEM(p) { 423 fdp = p->p_fd; 424 if (fdp->fd_cdir == olddp) { 425 vrele(fdp->fd_cdir); 426 vref(newdp); 427 fdp->fd_cdir = newdp; 428 cache_drop(fdp->fd_ncdir); 429 fdp->fd_ncdir = cache_hold(ncp); 430 } 431 if (fdp->fd_rdir == olddp) { 432 vrele(fdp->fd_rdir); 433 vref(newdp); 434 fdp->fd_rdir = newdp; 435 cache_drop(fdp->fd_nrdir); 436 fdp->fd_nrdir = cache_hold(ncp); 437 } 438 } 439 vput(newdp); 440 } 441 442 /* 443 * Unmount a file system. 444 * 445 * Note: unmount takes a path to the vnode mounted on as argument, 446 * not special file (as before). 447 */ 448 /* 449 * umount_args(char *path, int flags) 450 */ 451 /* ARGSUSED */ 452 int 453 unmount(struct unmount_args *uap) 454 { 455 struct thread *td = curthread; 456 struct proc *p = td->td_proc; 457 struct vnode *vp; 458 struct mount *mp; 459 int error; 460 struct nlookupdata nd; 461 462 KKASSERT(p); 463 if (p->p_ucred->cr_prison != NULL) 464 return (EPERM); 465 if (usermount == 0 && (error = suser(td))) 466 return (error); 467 468 vp = NULL; 469 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 470 if (error == 0) 471 error = nlookup(&nd); 472 if (error == 0) 473 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 474 nlookup_done(&nd); 475 if (error) 476 return (error); 477 478 mp = vp->v_mount; 479 480 /* 481 * Only root, or the user that did the original mount is 482 * permitted to unmount this filesystem. 483 */ 484 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 485 (error = suser(td))) { 486 vput(vp); 487 return (error); 488 } 489 490 /* 491 * Don't allow unmounting the root file system. 492 */ 493 if (mp->mnt_flag & MNT_ROOTFS) { 494 vput(vp); 495 return (EINVAL); 496 } 497 498 /* 499 * Must be the root of the filesystem 500 */ 501 if ((vp->v_flag & VROOT) == 0) { 502 vput(vp); 503 return (EINVAL); 504 } 505 vput(vp); 506 return (dounmount(mp, SCARG(uap, flags), td)); 507 } 508 509 /* 510 * Do the actual file system unmount. 511 */ 512 int 513 dounmount(struct mount *mp, int flags, struct thread *td) 514 { 515 struct vnode *coveredvp; 516 int error; 517 int async_flag; 518 lwkt_tokref ilock; 519 520 lwkt_gettoken(&ilock, &mountlist_token); 521 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 522 lwkt_reltoken(&ilock); 523 return (EBUSY); 524 } 525 mp->mnt_kern_flag |= MNTK_UNMOUNT; 526 /* Allow filesystems to detect that a forced unmount is in progress. */ 527 if (flags & MNT_FORCE) 528 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 529 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 530 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &ilock, td); 531 if (error) { 532 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 533 if (mp->mnt_kern_flag & MNTK_MWAIT) 534 wakeup(mp); 535 return (error); 536 } 537 538 if (mp->mnt_flag & MNT_EXPUBLIC) 539 vfs_setpublicfs(NULL, NULL, NULL); 540 541 vfs_msync(mp, MNT_WAIT); 542 async_flag = mp->mnt_flag & MNT_ASYNC; 543 mp->mnt_flag &=~ MNT_ASYNC; 544 cache_purgevfs(mp); /* remove cache entries for this file sys */ 545 if (mp->mnt_syncer != NULL) 546 vrele(mp->mnt_syncer); 547 if (((mp->mnt_flag & MNT_RDONLY) || 548 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 549 (flags & MNT_FORCE)) 550 error = VFS_UNMOUNT(mp, flags, td); 551 lwkt_gettokref(&ilock); 552 if (error) { 553 if (mp->mnt_syncer == NULL) 554 vfs_allocate_syncvnode(mp); 555 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 556 mp->mnt_flag |= async_flag; 557 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 558 &ilock, td); 559 if (mp->mnt_kern_flag & MNTK_MWAIT) 560 wakeup(mp); 561 return (error); 562 } 563 TAILQ_REMOVE(&mountlist, mp, mnt_list); 564 565 /* 566 * Remove any installed vnode ops here so the individual VFSs don't 567 * have to. 568 */ 569 vfs_rm_vnodeops(&mp->mnt_vn_coherency_ops); 570 vfs_rm_vnodeops(&mp->mnt_vn_journal_ops); 571 vfs_rm_vnodeops(&mp->mnt_vn_norm_ops); 572 vfs_rm_vnodeops(&mp->mnt_vn_spec_ops); 573 vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops); 574 575 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 576 coveredvp->v_mountedhere = NULL; 577 vrele(coveredvp); 578 cache_drop(mp->mnt_ncp); 579 mp->mnt_ncp = NULL; 580 } 581 mp->mnt_vfc->vfc_refcount--; 582 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) 583 panic("unmount: dangling vnode"); 584 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &ilock, td); 585 if (mp->mnt_kern_flag & MNTK_MWAIT) 586 wakeup(mp); 587 free(mp, M_MOUNT); 588 return (0); 589 } 590 591 /* 592 * Sync each mounted filesystem. 593 */ 594 595 #ifdef DEBUG 596 static int syncprt = 0; 597 SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); 598 #endif /* DEBUG */ 599 600 /* ARGSUSED */ 601 int 602 sync(struct sync_args *uap) 603 { 604 struct thread *td = curthread; 605 struct mount *mp, *nmp; 606 lwkt_tokref ilock; 607 int asyncflag; 608 609 lwkt_gettoken(&ilock, &mountlist_token); 610 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 611 if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { 612 nmp = TAILQ_NEXT(mp, mnt_list); 613 continue; 614 } 615 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 616 asyncflag = mp->mnt_flag & MNT_ASYNC; 617 mp->mnt_flag &= ~MNT_ASYNC; 618 vfs_msync(mp, MNT_NOWAIT); 619 VFS_SYNC(mp, MNT_NOWAIT, td); 620 mp->mnt_flag |= asyncflag; 621 } 622 lwkt_gettokref(&ilock); 623 nmp = TAILQ_NEXT(mp, mnt_list); 624 vfs_unbusy(mp, td); 625 } 626 lwkt_reltoken(&ilock); 627 /* 628 * print out buffer pool stat information on each sync() call. 629 */ 630 #ifdef DEBUG 631 if (syncprt) 632 vfs_bufstats(); 633 #endif /* DEBUG */ 634 return (0); 635 } 636 637 /* XXX PRISON: could be per prison flag */ 638 static int prison_quotas; 639 #if 0 640 SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); 641 #endif 642 643 /* 644 * quotactl_args(char *path, int fcmd, int uid, caddr_t arg) 645 * 646 * Change filesystem quotas. 647 */ 648 /* ARGSUSED */ 649 int 650 quotactl(struct quotactl_args *uap) 651 { 652 struct nlookupdata nd; 653 struct thread *td; 654 struct proc *p; 655 struct mount *mp; 656 int error; 657 658 td = curthread; 659 p = td->td_proc; 660 if (p->p_ucred->cr_prison && !prison_quotas) 661 return (EPERM); 662 663 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 664 if (error == 0) 665 error = nlookup(&nd); 666 if (error == 0) { 667 mp = nd.nl_ncp->nc_mount; 668 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 669 SCARG(uap, arg), nd.nl_td); 670 } 671 nlookup_done(&nd); 672 return (error); 673 } 674 675 /* 676 * mountctl(char *path, int op, int fd, const void *ctl, int ctllen, 677 * void *buf, int buflen) 678 * 679 * This function operates on a mount point and executes the specified 680 * operation using the specified control data, and possibly returns data. 681 * 682 * The actual number of bytes stored in the result buffer is returned, 0 683 * if none, otherwise an error is returned. 684 */ 685 /* ARGSUSED */ 686 int 687 mountctl(struct mountctl_args *uap) 688 { 689 struct thread *td = curthread; 690 struct proc *p = td->td_proc; 691 struct filedesc *fdp = p->p_fd; 692 struct file *fp; 693 void *ctl = NULL; 694 void *buf = NULL; 695 char *path = NULL; 696 int error; 697 698 /* 699 * Sanity and permissions checks. We must be root. 700 */ 701 KKASSERT(p); 702 if (p->p_ucred->cr_prison != NULL) 703 return (EPERM); 704 if ((error = suser(td)) != 0) 705 return (error); 706 707 /* 708 * Argument length checks 709 */ 710 if (uap->ctllen < 0 || uap->ctllen > 1024) 711 return (EINVAL); 712 if (uap->buflen < 0 || uap->buflen > 16 * 1024) 713 return (EINVAL); 714 if (uap->path == NULL) 715 return (EINVAL); 716 717 /* 718 * Allocate the necessary buffers and copyin data 719 */ 720 path = zalloc(namei_zone); 721 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 722 if (error) 723 goto done; 724 725 if (uap->ctllen) { 726 ctl = malloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO); 727 error = copyin(uap->ctl, ctl, uap->ctllen); 728 if (error) 729 goto done; 730 } 731 if (uap->buflen) 732 buf = malloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO); 733 734 /* 735 * Validate the descriptor 736 */ 737 if (uap->fd == -1) { 738 fp = NULL; 739 } else if ((u_int)uap->fd >= fdp->fd_nfiles || 740 (fp = fdp->fd_ofiles[uap->fd]) == NULL) { 741 error = EBADF; 742 goto done; 743 } 744 if (fp) 745 fhold(fp); 746 747 /* 748 * Execute the internal kernel function and clean up. 749 */ 750 error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result); 751 if (fp) 752 fdrop(fp, td); 753 if (error == 0 && uap->sysmsg_result > 0) 754 error = copyout(buf, uap->buf, uap->sysmsg_result); 755 done: 756 if (path) 757 zfree(namei_zone, path); 758 if (ctl) 759 free(ctl, M_TEMP); 760 if (buf) 761 free(buf, M_TEMP); 762 return (error); 763 } 764 765 /* 766 * Execute a mount control operation by resolving the path to a mount point 767 * and calling vop_mountctl(). 768 */ 769 int 770 kern_mountctl(const char *path, int op, struct file *fp, 771 const void *ctl, int ctllen, 772 void *buf, int buflen, int *res) 773 { 774 struct vnode *vp; 775 struct mount *mp; 776 struct nlookupdata nd; 777 int error; 778 779 *res = 0; 780 vp = NULL; 781 error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); 782 if (error == 0) 783 error = nlookup(&nd); 784 if (error == 0) 785 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 786 nlookup_done(&nd); 787 if (error) 788 return (error); 789 790 mp = vp->v_mount; 791 792 /* 793 * Must be the root of the filesystem 794 */ 795 if ((vp->v_flag & VROOT) == 0) { 796 vput(vp); 797 return (EINVAL); 798 } 799 error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen, 800 buf, buflen, res); 801 vput(vp); 802 return (error); 803 } 804 805 int 806 kern_statfs(struct nlookupdata *nd, struct statfs *buf) 807 { 808 struct thread *td = curthread; 809 struct mount *mp; 810 struct statfs *sp; 811 int error; 812 813 if ((error = nlookup(nd)) != 0) 814 return (error); 815 mp = nd->nl_ncp->nc_mount; 816 sp = &mp->mnt_stat; 817 if ((error = VFS_STATFS(mp, sp, td)) != 0) 818 return (error); 819 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 820 bcopy(sp, buf, sizeof(*buf)); 821 /* Only root should have access to the fsid's. */ 822 if (suser(td)) 823 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 824 return (0); 825 } 826 827 /* 828 * statfs_args(char *path, struct statfs *buf) 829 * 830 * Get filesystem statistics. 831 */ 832 int 833 statfs(struct statfs_args *uap) 834 { 835 struct nlookupdata nd; 836 struct statfs buf; 837 int error; 838 839 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 840 if (error == 0) 841 error = kern_statfs(&nd, &buf); 842 nlookup_done(&nd); 843 if (error == 0) 844 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 845 return (error); 846 } 847 848 int 849 kern_fstatfs(int fd, struct statfs *buf) 850 { 851 struct thread *td = curthread; 852 struct proc *p = td->td_proc; 853 struct file *fp; 854 struct mount *mp; 855 struct statfs *sp; 856 int error; 857 858 KKASSERT(p); 859 error = getvnode(p->p_fd, fd, &fp); 860 if (error) 861 return (error); 862 mp = ((struct vnode *)fp->f_data)->v_mount; 863 if (mp == NULL) 864 return (EBADF); 865 sp = &mp->mnt_stat; 866 error = VFS_STATFS(mp, sp, td); 867 if (error) 868 return (error); 869 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 870 bcopy(sp, buf, sizeof(*buf)); 871 /* Only root should have access to the fsid's. */ 872 if (suser(td)) 873 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 874 return (0); 875 } 876 877 /* 878 * fstatfs_args(int fd, struct statfs *buf) 879 * 880 * Get filesystem statistics. 881 */ 882 int 883 fstatfs(struct fstatfs_args *uap) 884 { 885 struct statfs buf; 886 int error; 887 888 error = kern_fstatfs(uap->fd, &buf); 889 890 if (error == 0) 891 error = copyout(&buf, uap->buf, sizeof(*uap->buf)); 892 return (error); 893 } 894 895 /* 896 * getfsstat_args(struct statfs *buf, long bufsize, int flags) 897 * 898 * Get statistics on all filesystems. 899 */ 900 /* ARGSUSED */ 901 int 902 getfsstat(struct getfsstat_args *uap) 903 { 904 struct thread *td = curthread; 905 struct mount *mp, *nmp; 906 struct statfs *sp; 907 caddr_t sfsp; 908 lwkt_tokref ilock; 909 long count, maxcount, error; 910 911 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 912 sfsp = (caddr_t)SCARG(uap, buf); 913 count = 0; 914 lwkt_gettoken(&ilock, &mountlist_token); 915 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 916 if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { 917 nmp = TAILQ_NEXT(mp, mnt_list); 918 continue; 919 } 920 if (sfsp && count < maxcount) { 921 sp = &mp->mnt_stat; 922 /* 923 * If MNT_NOWAIT or MNT_LAZY is specified, do not 924 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 925 * overrides MNT_WAIT. 926 */ 927 if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 || 928 (SCARG(uap, flags) & MNT_WAIT)) && 929 (error = VFS_STATFS(mp, sp, td))) { 930 lwkt_gettokref(&ilock); 931 nmp = TAILQ_NEXT(mp, mnt_list); 932 vfs_unbusy(mp, td); 933 continue; 934 } 935 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 936 error = copyout(sp, sfsp, sizeof(*sp)); 937 if (error) { 938 vfs_unbusy(mp, td); 939 return (error); 940 } 941 sfsp += sizeof(*sp); 942 } 943 count++; 944 lwkt_gettokref(&ilock); 945 nmp = TAILQ_NEXT(mp, mnt_list); 946 vfs_unbusy(mp, td); 947 } 948 lwkt_reltoken(&ilock); 949 if (sfsp && count > maxcount) 950 uap->sysmsg_result = maxcount; 951 else 952 uap->sysmsg_result = count; 953 return (0); 954 } 955 956 /* 957 * fchdir_args(int fd) 958 * 959 * Change current working directory to a given file descriptor. 960 */ 961 /* ARGSUSED */ 962 int 963 fchdir(struct fchdir_args *uap) 964 { 965 struct thread *td = curthread; 966 struct proc *p = td->td_proc; 967 struct filedesc *fdp = p->p_fd; 968 struct vnode *vp, *ovp; 969 struct mount *mp; 970 struct file *fp; 971 struct namecache *ncp, *oncp; 972 struct namecache *nct; 973 int error; 974 975 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 976 return (error); 977 vp = (struct vnode *)fp->f_data; 978 vref(vp); 979 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 980 if (vp->v_type != VDIR || fp->f_ncp == NULL) 981 error = ENOTDIR; 982 else 983 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, td); 984 if (error) { 985 vput(vp); 986 return (error); 987 } 988 ncp = cache_hold(fp->f_ncp); 989 while (!error && (mp = vp->v_mountedhere) != NULL) { 990 error = nlookup_mp(mp, &nct); 991 if (error == 0) { 992 cache_unlock(nct); /* leave ref intact */ 993 vput(vp); 994 vp = nct->nc_vp; 995 error = vget(vp, LK_SHARED, td); 996 KKASSERT(error == 0); 997 cache_drop(ncp); 998 ncp = nct; 999 } 1000 } 1001 if (error == 0) { 1002 ovp = fdp->fd_cdir; 1003 oncp = fdp->fd_ncdir; 1004 VOP_UNLOCK(vp, 0, td); /* leave ref intact */ 1005 fdp->fd_cdir = vp; 1006 fdp->fd_ncdir = ncp; 1007 cache_drop(oncp); 1008 vrele(ovp); 1009 } else { 1010 cache_drop(ncp); 1011 vput(vp); 1012 } 1013 return (error); 1014 } 1015 1016 int 1017 kern_chdir(struct nlookupdata *nd) 1018 { 1019 struct thread *td = curthread; 1020 struct proc *p = td->td_proc; 1021 struct filedesc *fdp = p->p_fd; 1022 struct vnode *vp, *ovp; 1023 struct namecache *oncp; 1024 int error; 1025 1026 if ((error = nlookup(nd)) != 0) 1027 return (error); 1028 if ((vp = nd->nl_ncp->nc_vp) == NULL) 1029 return (ENOENT); 1030 if ((error = vget(vp, LK_SHARED, td)) != 0) 1031 return (error); 1032 1033 error = checkvp_chdir(vp, td); 1034 VOP_UNLOCK(vp, 0, td); 1035 if (error == 0) { 1036 ovp = fdp->fd_cdir; 1037 oncp = fdp->fd_ncdir; 1038 cache_unlock(nd->nl_ncp); /* leave reference intact */ 1039 fdp->fd_ncdir = nd->nl_ncp; 1040 fdp->fd_cdir = vp; 1041 cache_drop(oncp); 1042 vrele(ovp); 1043 nd->nl_ncp = NULL; 1044 } else { 1045 vrele(vp); 1046 } 1047 return (error); 1048 } 1049 1050 /* 1051 * chdir_args(char *path) 1052 * 1053 * Change current working directory (``.''). 1054 */ 1055 int 1056 chdir(struct chdir_args *uap) 1057 { 1058 struct nlookupdata nd; 1059 int error; 1060 1061 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1062 if (error == 0) 1063 error = kern_chdir(&nd); 1064 nlookup_done(&nd); 1065 return (error); 1066 } 1067 1068 /* 1069 * Helper function for raised chroot(2) security function: Refuse if 1070 * any filedescriptors are open directories. 1071 */ 1072 static int 1073 chroot_refuse_vdir_fds(fdp) 1074 struct filedesc *fdp; 1075 { 1076 struct vnode *vp; 1077 struct file *fp; 1078 int error; 1079 int fd; 1080 1081 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 1082 error = getvnode(fdp, fd, &fp); 1083 if (error) 1084 continue; 1085 vp = (struct vnode *)fp->f_data; 1086 if (vp->v_type != VDIR) 1087 continue; 1088 return(EPERM); 1089 } 1090 return (0); 1091 } 1092 1093 /* 1094 * This sysctl determines if we will allow a process to chroot(2) if it 1095 * has a directory open: 1096 * 0: disallowed for all processes. 1097 * 1: allowed for processes that were not already chroot(2)'ed. 1098 * 2: allowed for all processes. 1099 */ 1100 1101 static int chroot_allow_open_directories = 1; 1102 1103 SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 1104 &chroot_allow_open_directories, 0, ""); 1105 1106 /* 1107 * chroot to the specified namecache entry. We obtain the vp from the 1108 * namecache data. The passed ncp must be locked and referenced and will 1109 * remain locked and referenced on return. 1110 */ 1111 int 1112 kern_chroot(struct namecache *ncp) 1113 { 1114 struct thread *td = curthread; 1115 struct proc *p = td->td_proc; 1116 struct filedesc *fdp = p->p_fd; 1117 struct vnode *vp; 1118 int error; 1119 1120 /* 1121 * Only root can chroot 1122 */ 1123 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) 1124 return (error); 1125 1126 /* 1127 * Disallow open directory descriptors (fchdir() breakouts). 1128 */ 1129 if (chroot_allow_open_directories == 0 || 1130 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 1131 if ((error = chroot_refuse_vdir_fds(fdp)) != 0) 1132 return (error); 1133 } 1134 if ((vp = ncp->nc_vp) == NULL) 1135 return (ENOENT); 1136 1137 if ((error = vget(vp, LK_SHARED, td)) != 0) 1138 return (error); 1139 1140 /* 1141 * Check the validity of vp as a directory to change to and 1142 * associate it with rdir/jdir. 1143 */ 1144 error = checkvp_chdir(vp, td); 1145 VOP_UNLOCK(vp, 0, td); /* leave reference intact */ 1146 if (error == 0) { 1147 vrele(fdp->fd_rdir); 1148 fdp->fd_rdir = vp; /* reference inherited by fd_rdir */ 1149 cache_drop(fdp->fd_nrdir); 1150 fdp->fd_nrdir = cache_hold(ncp); 1151 if (fdp->fd_jdir == NULL) { 1152 fdp->fd_jdir = vp; 1153 vref(fdp->fd_jdir); 1154 fdp->fd_njdir = cache_hold(ncp); 1155 } 1156 } else { 1157 vrele(vp); 1158 } 1159 return (error); 1160 } 1161 1162 /* 1163 * chroot_args(char *path) 1164 * 1165 * Change notion of root (``/'') directory. 1166 */ 1167 /* ARGSUSED */ 1168 int 1169 chroot(struct chroot_args *uap) 1170 { 1171 struct thread *td = curthread; 1172 struct nlookupdata nd; 1173 int error; 1174 1175 KKASSERT(td->td_proc); 1176 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1177 if (error) { 1178 nlookup_done(&nd); 1179 return(error); 1180 } 1181 error = nlookup(&nd); 1182 if (error == 0) 1183 error = kern_chroot(nd.nl_ncp); 1184 nlookup_done(&nd); 1185 return(error); 1186 } 1187 1188 /* 1189 * Common routine for chroot and chdir. Given a locked, referenced vnode, 1190 * determine whether it is legal to chdir to the vnode. The vnode's state 1191 * is not changed by this call. 1192 */ 1193 int 1194 checkvp_chdir(struct vnode *vp, struct thread *td) 1195 { 1196 int error; 1197 1198 if (vp->v_type != VDIR) 1199 error = ENOTDIR; 1200 else 1201 error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred, td); 1202 return (error); 1203 } 1204 1205 int 1206 kern_open(struct nlookupdata *nd, int oflags, int mode, int *res) 1207 { 1208 struct thread *td = curthread; 1209 struct proc *p = td->td_proc; 1210 struct filedesc *fdp = p->p_fd; 1211 int cmode, flags; 1212 struct file *nfp; 1213 struct file *fp; 1214 struct vnode *vp; 1215 int type, indx, error; 1216 struct flock lf; 1217 1218 if ((oflags & O_ACCMODE) == O_ACCMODE) 1219 return (EINVAL); 1220 flags = FFLAGS(oflags); 1221 error = falloc(p, &nfp, NULL); 1222 if (error) 1223 return (error); 1224 fp = nfp; 1225 cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 1226 1227 /* 1228 * XXX p_dupfd is a real mess. It allows a device to return a 1229 * file descriptor to be duplicated rather then doing the open 1230 * itself. 1231 */ 1232 p->p_dupfd = -1; 1233 1234 /* 1235 * Call vn_open() to do the lookup and assign the vnode to the 1236 * file pointer. vn_open() does not change the ref count on fp 1237 * and the vnode, on success, will be inherited by the file pointer 1238 * and unlocked. 1239 */ 1240 nd->nl_flags |= NLC_LOCKVP; 1241 error = vn_open(nd, fp, flags, cmode); 1242 nlookup_done(nd); 1243 if (error) { 1244 /* 1245 * handle special fdopen() case. bleh. dupfdopen() is 1246 * responsible for dropping the old contents of ofiles[indx] 1247 * if it succeeds. 1248 * 1249 * Note that if fsetfd() succeeds it will add a ref to fp 1250 * which represents the fd_ofiles[] assignment. We must still 1251 * drop our reference. 1252 */ 1253 if ((error == ENODEV || error == ENXIO) && p->p_dupfd >= 0) { 1254 if (fsetfd(p, fp, &indx) == 0) { 1255 error = dupfdopen(fdp, indx, p->p_dupfd, flags, error); 1256 if (error == 0) { 1257 *res = indx; 1258 fdrop(fp, td); /* our ref */ 1259 return (0); 1260 } 1261 if (fdp->fd_ofiles[indx] == fp) { 1262 fdp->fd_ofiles[indx] = NULL; 1263 fdrop(fp, td); /* fd_ofiles[] ref */ 1264 } 1265 } 1266 } 1267 fdrop(fp, td); /* our ref */ 1268 if (error == ERESTART) 1269 error = EINTR; 1270 return (error); 1271 } 1272 1273 /* 1274 * ref the vnode for ourselves so it can't be ripped out from under 1275 * is. XXX need an ND flag to request that the vnode be returned 1276 * anyway. 1277 */ 1278 vp = (struct vnode *)fp->f_data; 1279 vref(vp); 1280 if ((error = fsetfd(p, fp, &indx)) != 0) { 1281 fdrop(fp, td); 1282 vrele(vp); 1283 return (error); 1284 } 1285 1286 /* 1287 * If no error occurs the vp will have been assigned to the file 1288 * pointer. 1289 */ 1290 p->p_dupfd = 0; 1291 1292 /* 1293 * There should be 2 references on the file, one from the descriptor 1294 * table, and one for us. 1295 * 1296 * Handle the case where someone closed the file (via its file 1297 * descriptor) while we were blocked. The end result should look 1298 * like opening the file succeeded but it was immediately closed. 1299 */ 1300 if (fp->f_count == 1) { 1301 KASSERT(fdp->fd_ofiles[indx] != fp, 1302 ("Open file descriptor lost all refs")); 1303 vrele(vp); 1304 fo_close(fp, td); 1305 fdrop(fp, td); 1306 *res = indx; 1307 return 0; 1308 } 1309 1310 if (flags & (O_EXLOCK | O_SHLOCK)) { 1311 lf.l_whence = SEEK_SET; 1312 lf.l_start = 0; 1313 lf.l_len = 0; 1314 if (flags & O_EXLOCK) 1315 lf.l_type = F_WRLCK; 1316 else 1317 lf.l_type = F_RDLCK; 1318 type = F_FLOCK; 1319 if ((flags & FNONBLOCK) == 0) 1320 type |= F_WAIT; 1321 1322 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 1323 /* 1324 * lock request failed. Normally close the descriptor 1325 * but handle the case where someone might have dup()d 1326 * it when we weren't looking. One reference is 1327 * owned by the descriptor array, the other by us. 1328 */ 1329 vrele(vp); 1330 if (fdp->fd_ofiles[indx] == fp) { 1331 fdp->fd_ofiles[indx] = NULL; 1332 fdrop(fp, td); 1333 } 1334 fdrop(fp, td); 1335 return (error); 1336 } 1337 fp->f_flag |= FHASLOCK; 1338 } 1339 /* assert that vn_open created a backing object if one is needed */ 1340 KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0, 1341 ("open: vmio vnode has no backing object after vn_open")); 1342 1343 vrele(vp); 1344 1345 /* 1346 * release our private reference, leaving the one associated with the 1347 * descriptor table intact. 1348 */ 1349 fdrop(fp, td); 1350 *res = indx; 1351 return (0); 1352 } 1353 1354 /* 1355 * open_args(char *path, int flags, int mode) 1356 * 1357 * Check permissions, allocate an open file structure, 1358 * and call the device open routine if any. 1359 */ 1360 int 1361 open(struct open_args *uap) 1362 { 1363 struct nlookupdata nd; 1364 int error; 1365 1366 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1367 if (error == 0) { 1368 error = kern_open(&nd, uap->flags, 1369 uap->mode, &uap->sysmsg_result); 1370 } 1371 nlookup_done(&nd); 1372 return (error); 1373 } 1374 1375 int 1376 kern_mknod(struct nlookupdata *nd, int mode, int dev) 1377 { 1378 struct namecache *ncp; 1379 struct thread *td = curthread; 1380 struct proc *p = td->td_proc; 1381 struct vnode *vp; 1382 struct vattr vattr; 1383 int error; 1384 int whiteout = 0; 1385 1386 KKASSERT(p); 1387 1388 switch (mode & S_IFMT) { 1389 case S_IFCHR: 1390 case S_IFBLK: 1391 error = suser(td); 1392 break; 1393 default: 1394 error = suser_cred(p->p_ucred, PRISON_ROOT); 1395 break; 1396 } 1397 if (error) 1398 return (error); 1399 1400 bwillwrite(); 1401 nd->nl_flags |= NLC_CREATE; 1402 if ((error = nlookup(nd)) != 0) 1403 return (error); 1404 ncp = nd->nl_ncp; 1405 if (ncp->nc_vp) 1406 return (EEXIST); 1407 1408 VATTR_NULL(&vattr); 1409 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1410 vattr.va_rdev = dev; 1411 whiteout = 0; 1412 1413 switch (mode & S_IFMT) { 1414 case S_IFMT: /* used by badsect to flag bad sectors */ 1415 vattr.va_type = VBAD; 1416 break; 1417 case S_IFCHR: 1418 vattr.va_type = VCHR; 1419 break; 1420 case S_IFBLK: 1421 vattr.va_type = VBLK; 1422 break; 1423 case S_IFWHT: 1424 whiteout = 1; 1425 break; 1426 default: 1427 error = EINVAL; 1428 break; 1429 } 1430 if (error == 0) { 1431 if (whiteout) { 1432 error = VOP_NWHITEOUT(ncp, nd->nl_cred, NAMEI_CREATE); 1433 } else { 1434 vp = NULL; 1435 error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); 1436 if (error == 0) 1437 vput(vp); 1438 } 1439 } 1440 return (error); 1441 } 1442 1443 /* 1444 * mknod_args(char *path, int mode, int dev) 1445 * 1446 * Create a special file. 1447 */ 1448 int 1449 mknod(struct mknod_args *uap) 1450 { 1451 struct nlookupdata nd; 1452 int error; 1453 1454 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1455 if (error == 0) 1456 error = kern_mknod(&nd, uap->mode, uap->dev); 1457 nlookup_done(&nd); 1458 return (error); 1459 } 1460 1461 int 1462 kern_mkfifo(struct nlookupdata *nd, int mode) 1463 { 1464 struct namecache *ncp; 1465 struct thread *td = curthread; 1466 struct proc *p = td->td_proc; 1467 struct vattr vattr; 1468 struct vnode *vp; 1469 int error; 1470 1471 bwillwrite(); 1472 1473 nd->nl_flags |= NLC_CREATE; 1474 if ((error = nlookup(nd)) != 0) 1475 return (error); 1476 ncp = nd->nl_ncp; 1477 if (ncp->nc_vp) 1478 return (EEXIST); 1479 1480 VATTR_NULL(&vattr); 1481 vattr.va_type = VFIFO; 1482 vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; 1483 vp = NULL; 1484 error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); 1485 if (error == 0) 1486 vput(vp); 1487 return (error); 1488 } 1489 1490 /* 1491 * mkfifo_args(char *path, int mode) 1492 * 1493 * Create a named pipe. 1494 */ 1495 int 1496 mkfifo(struct mkfifo_args *uap) 1497 { 1498 struct nlookupdata nd; 1499 int error; 1500 1501 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1502 if (error == 0) 1503 error = kern_mkfifo(&nd, uap->mode); 1504 nlookup_done(&nd); 1505 return (error); 1506 } 1507 1508 int 1509 kern_link(struct nlookupdata *nd, struct nlookupdata *linknd) 1510 { 1511 struct thread *td = curthread; 1512 struct vnode *vp; 1513 int error; 1514 1515 /* 1516 * Lookup the source and obtained a locked vnode. 1517 * 1518 * XXX relookup on vget failure / race ? 1519 */ 1520 bwillwrite(); 1521 if ((error = nlookup(nd)) != 0) 1522 return (error); 1523 vp = nd->nl_ncp->nc_vp; 1524 KKASSERT(vp != NULL); 1525 if (vp->v_type == VDIR) 1526 return (EPERM); /* POSIX */ 1527 if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0) 1528 return (error); 1529 1530 /* 1531 * Unlock the source so we can lookup the target without deadlocking 1532 * (XXX vp is locked already, possible other deadlock?). The target 1533 * must not exist. 1534 */ 1535 KKASSERT(nd->nl_flags & NLC_NCPISLOCKED); 1536 nd->nl_flags &= ~NLC_NCPISLOCKED; 1537 cache_unlock(nd->nl_ncp); 1538 1539 linknd->nl_flags |= NLC_CREATE; 1540 if ((error = nlookup(linknd)) != 0) { 1541 vput(vp); 1542 return (error); 1543 } 1544 if (linknd->nl_ncp->nc_vp) { 1545 vput(vp); 1546 return (EEXIST); 1547 } 1548 1549 /* 1550 * Finally run the new API VOP. 1551 */ 1552 error = VOP_NLINK(linknd->nl_ncp, vp, linknd->nl_cred); 1553 vput(vp); 1554 return (error); 1555 } 1556 1557 /* 1558 * link_args(char *path, char *link) 1559 * 1560 * Make a hard file link. 1561 */ 1562 int 1563 link(struct link_args *uap) 1564 { 1565 struct nlookupdata nd, linknd; 1566 int error; 1567 1568 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1569 if (error == 0) { 1570 error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0); 1571 if (error == 0) 1572 error = kern_link(&nd, &linknd); 1573 nlookup_done(&linknd); 1574 } 1575 nlookup_done(&nd); 1576 return (error); 1577 } 1578 1579 int 1580 kern_symlink(struct nlookupdata *nd, char *path, int mode) 1581 { 1582 struct namecache *ncp; 1583 struct vattr vattr; 1584 struct vnode *vp; 1585 int error; 1586 1587 bwillwrite(); 1588 nd->nl_flags |= NLC_CREATE; 1589 if ((error = nlookup(nd)) != 0) 1590 return (error); 1591 ncp = nd->nl_ncp; 1592 if (ncp->nc_vp) 1593 return (EEXIST); 1594 1595 VATTR_NULL(&vattr); 1596 vattr.va_mode = mode; 1597 error = VOP_NSYMLINK(ncp, &vp, nd->nl_cred, &vattr, path); 1598 if (error == 0) 1599 vput(vp); 1600 return (error); 1601 } 1602 1603 /* 1604 * symlink(char *path, char *link) 1605 * 1606 * Make a symbolic link. 1607 */ 1608 int 1609 symlink(struct symlink_args *uap) 1610 { 1611 struct thread *td = curthread; 1612 struct nlookupdata nd; 1613 char *path; 1614 int error; 1615 int mode; 1616 1617 path = zalloc(namei_zone); 1618 error = copyinstr(uap->path, path, MAXPATHLEN, NULL); 1619 if (error == 0) { 1620 error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0); 1621 if (error == 0) { 1622 mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask; 1623 error = kern_symlink(&nd, path, mode); 1624 } 1625 nlookup_done(&nd); 1626 } 1627 zfree(namei_zone, path); 1628 return (error); 1629 } 1630 1631 /* 1632 * undelete_args(char *path) 1633 * 1634 * Delete a whiteout from the filesystem. 1635 */ 1636 /* ARGSUSED */ 1637 int 1638 undelete(struct undelete_args *uap) 1639 { 1640 struct nlookupdata nd; 1641 int error; 1642 1643 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, 0); 1644 bwillwrite(); 1645 nd.nl_flags |= NLC_DELETE; 1646 if (error == 0) 1647 error = nlookup(&nd); 1648 if (error == 0) 1649 error = VOP_NWHITEOUT(nd.nl_ncp, nd.nl_cred, NAMEI_DELETE); 1650 nlookup_done(&nd); 1651 return (error); 1652 } 1653 1654 int 1655 kern_unlink(struct nlookupdata *nd) 1656 { 1657 struct namecache *ncp; 1658 int error; 1659 1660 bwillwrite(); 1661 nd->nl_flags |= NLC_DELETE; 1662 if ((error = nlookup(nd)) != 0) 1663 return (error); 1664 ncp = nd->nl_ncp; 1665 error = VOP_NREMOVE(ncp, nd->nl_cred); 1666 return (error); 1667 } 1668 1669 /* 1670 * unlink_args(char *path) 1671 * 1672 * Delete a name from the filesystem. 1673 */ 1674 int 1675 unlink(struct unlink_args *uap) 1676 { 1677 struct nlookupdata nd; 1678 int error; 1679 1680 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1681 if (error == 0) 1682 error = kern_unlink(&nd); 1683 nlookup_done(&nd); 1684 return (error); 1685 } 1686 1687 int 1688 kern_lseek(int fd, off_t offset, int whence, off_t *res) 1689 { 1690 struct thread *td = curthread; 1691 struct proc *p = td->td_proc; 1692 struct filedesc *fdp = p->p_fd; 1693 struct file *fp; 1694 struct vattr vattr; 1695 int error; 1696 1697 if ((u_int)fd >= fdp->fd_nfiles || 1698 (fp = fdp->fd_ofiles[fd]) == NULL) 1699 return (EBADF); 1700 if (fp->f_type != DTYPE_VNODE) 1701 return (ESPIPE); 1702 switch (whence) { 1703 case L_INCR: 1704 fp->f_offset += offset; 1705 break; 1706 case L_XTND: 1707 error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, td); 1708 if (error) 1709 return (error); 1710 fp->f_offset = offset + vattr.va_size; 1711 break; 1712 case L_SET: 1713 fp->f_offset = offset; 1714 break; 1715 default: 1716 return (EINVAL); 1717 } 1718 *res = fp->f_offset; 1719 return (0); 1720 } 1721 1722 /* 1723 * lseek_args(int fd, int pad, off_t offset, int whence) 1724 * 1725 * Reposition read/write file offset. 1726 */ 1727 int 1728 lseek(struct lseek_args *uap) 1729 { 1730 int error; 1731 1732 error = kern_lseek(uap->fd, uap->offset, uap->whence, 1733 &uap->sysmsg_offset); 1734 1735 return (error); 1736 } 1737 1738 int 1739 kern_access(struct nlookupdata *nd, int aflags) 1740 { 1741 struct thread *td = curthread; 1742 struct vnode *vp; 1743 int error, flags; 1744 1745 if ((error = nlookup(nd)) != 0) 1746 return (error); 1747 retry: 1748 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); 1749 if (error) 1750 return (error); 1751 1752 /* Flags == 0 means only check for existence. */ 1753 if (aflags) { 1754 flags = 0; 1755 if (aflags & R_OK) 1756 flags |= VREAD; 1757 if (aflags & W_OK) 1758 flags |= VWRITE; 1759 if (aflags & X_OK) 1760 flags |= VEXEC; 1761 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1762 error = VOP_ACCESS(vp, flags, nd->nl_cred, td); 1763 1764 /* 1765 * If the file handle is stale we have to re-resolve the 1766 * entry. This is a hack at the moment. 1767 */ 1768 if (error == ESTALE) { 1769 cache_setunresolved(nd->nl_ncp); 1770 error = cache_resolve(nd->nl_ncp, nd->nl_cred); 1771 if (error == 0) { 1772 vput(vp); 1773 vp = NULL; 1774 goto retry; 1775 } 1776 } 1777 } 1778 vput(vp); 1779 return (error); 1780 } 1781 1782 /* 1783 * access_args(char *path, int flags) 1784 * 1785 * Check access permissions. 1786 */ 1787 int 1788 access(struct access_args *uap) 1789 { 1790 struct nlookupdata nd; 1791 int error; 1792 1793 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1794 if (error == 0) 1795 error = kern_access(&nd, uap->flags); 1796 nlookup_done(&nd); 1797 return (error); 1798 } 1799 1800 int 1801 kern_stat(struct nlookupdata *nd, struct stat *st) 1802 { 1803 int error; 1804 struct vnode *vp; 1805 thread_t td; 1806 1807 if ((error = nlookup(nd)) != 0) 1808 return (error); 1809 again: 1810 if ((vp = nd->nl_ncp->nc_vp) == NULL) 1811 return (ENOENT); 1812 1813 td = curthread; 1814 if ((error = vget(vp, LK_SHARED, td)) != 0) 1815 return (error); 1816 error = vn_stat(vp, st, td); 1817 1818 /* 1819 * If the file handle is stale we have to re-resolve the entry. This 1820 * is a hack at the moment. 1821 */ 1822 if (error == ESTALE) { 1823 cache_setunresolved(nd->nl_ncp); 1824 error = cache_resolve(nd->nl_ncp, nd->nl_cred); 1825 if (error == 0) { 1826 vput(vp); 1827 goto again; 1828 } 1829 } 1830 vput(vp); 1831 return (error); 1832 } 1833 1834 /* 1835 * stat_args(char *path, struct stat *ub) 1836 * 1837 * Get file status; this version follows links. 1838 */ 1839 int 1840 stat(struct stat_args *uap) 1841 { 1842 struct nlookupdata nd; 1843 struct stat st; 1844 int error; 1845 1846 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 1847 if (error == 0) { 1848 error = kern_stat(&nd, &st); 1849 if (error == 0) 1850 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 1851 } 1852 nlookup_done(&nd); 1853 return (error); 1854 } 1855 1856 /* 1857 * lstat_args(char *path, struct stat *ub) 1858 * 1859 * Get file status; this version does not follow links. 1860 */ 1861 int 1862 lstat(struct lstat_args *uap) 1863 { 1864 struct nlookupdata nd; 1865 struct stat st; 1866 int error; 1867 1868 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 1869 if (error == 0) { 1870 error = kern_stat(&nd, &st); 1871 if (error == 0) 1872 error = copyout(&st, uap->ub, sizeof(*uap->ub)); 1873 } 1874 nlookup_done(&nd); 1875 return (error); 1876 } 1877 1878 void 1879 cvtnstat(sb, nsb) 1880 struct stat *sb; 1881 struct nstat *nsb; 1882 { 1883 nsb->st_dev = sb->st_dev; 1884 nsb->st_ino = sb->st_ino; 1885 nsb->st_mode = sb->st_mode; 1886 nsb->st_nlink = sb->st_nlink; 1887 nsb->st_uid = sb->st_uid; 1888 nsb->st_gid = sb->st_gid; 1889 nsb->st_rdev = sb->st_rdev; 1890 nsb->st_atimespec = sb->st_atimespec; 1891 nsb->st_mtimespec = sb->st_mtimespec; 1892 nsb->st_ctimespec = sb->st_ctimespec; 1893 nsb->st_size = sb->st_size; 1894 nsb->st_blocks = sb->st_blocks; 1895 nsb->st_blksize = sb->st_blksize; 1896 nsb->st_flags = sb->st_flags; 1897 nsb->st_gen = sb->st_gen; 1898 nsb->st_qspare[0] = sb->st_qspare[0]; 1899 nsb->st_qspare[1] = sb->st_qspare[1]; 1900 } 1901 1902 /* 1903 * nstat_args(char *path, struct nstat *ub) 1904 */ 1905 /* ARGSUSED */ 1906 int 1907 nstat(struct nstat_args *uap) 1908 { 1909 struct thread *td = curthread; 1910 struct vnode *vp; 1911 struct stat sb; 1912 struct nstat nsb; 1913 struct nlookupdata nd; 1914 int error; 1915 1916 vp = NULL; 1917 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 1918 if (error == 0) 1919 error = nlookup(&nd); 1920 if (error == 0) 1921 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 1922 nlookup_done(&nd); 1923 if (error == 0) { 1924 error = vn_stat(vp, &sb, td); 1925 vput(vp); 1926 if (error == 0) { 1927 cvtnstat(&sb, &nsb); 1928 error = copyout(&nsb, SCARG(uap, ub), sizeof(nsb)); 1929 } 1930 } 1931 return (error); 1932 } 1933 1934 /* 1935 * lstat_args(char *path, struct stat *ub) 1936 * 1937 * Get file status; this version does not follow links. 1938 */ 1939 /* ARGSUSED */ 1940 int 1941 nlstat(struct nlstat_args *uap) 1942 { 1943 struct thread *td = curthread; 1944 struct vnode *vp; 1945 struct stat sb; 1946 struct nstat nsb; 1947 struct nlookupdata nd; 1948 int error; 1949 1950 vp = NULL; 1951 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, 0); 1952 if (error == 0) 1953 error = nlookup(&nd); 1954 if (error == 0) 1955 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 1956 nlookup_done(&nd); 1957 if (error == 0) { 1958 error = vn_stat(vp, &sb, td); 1959 vput(vp); 1960 if (error == 0) { 1961 cvtnstat(&sb, &nsb); 1962 error = copyout(&nsb, SCARG(uap, ub), sizeof(nsb)); 1963 } 1964 } 1965 return (error); 1966 } 1967 1968 /* 1969 * pathconf_Args(char *path, int name) 1970 * 1971 * Get configurable pathname variables. 1972 */ 1973 /* ARGSUSED */ 1974 int 1975 pathconf(struct pathconf_args *uap) 1976 { 1977 struct nlookupdata nd; 1978 struct vnode *vp; 1979 int error; 1980 1981 vp = NULL; 1982 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 1983 if (error == 0) 1984 error = nlookup(&nd); 1985 if (error == 0) 1986 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 1987 nlookup_done(&nd); 1988 if (error == 0) { 1989 error = VOP_PATHCONF(vp, SCARG(uap, name), uap->sysmsg_fds); 1990 vput(vp); 1991 } 1992 return (error); 1993 } 1994 1995 /* 1996 * XXX: daver 1997 * kern_readlink isn't properly split yet. There is a copyin burried 1998 * in VOP_READLINK(). 1999 */ 2000 int 2001 kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res) 2002 { 2003 struct thread *td = curthread; 2004 struct proc *p = td->td_proc; 2005 struct vnode *vp; 2006 struct iovec aiov; 2007 struct uio auio; 2008 int error; 2009 2010 if ((error = nlookup(nd)) != 0) 2011 return (error); 2012 error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); 2013 if (error) 2014 return (error); 2015 if (vp->v_type != VLNK) { 2016 error = EINVAL; 2017 } else { 2018 aiov.iov_base = buf; 2019 aiov.iov_len = count; 2020 auio.uio_iov = &aiov; 2021 auio.uio_iovcnt = 1; 2022 auio.uio_offset = 0; 2023 auio.uio_rw = UIO_READ; 2024 auio.uio_segflg = UIO_USERSPACE; 2025 auio.uio_td = td; 2026 auio.uio_resid = count; 2027 error = VOP_READLINK(vp, &auio, p->p_ucred); 2028 } 2029 vput(vp); 2030 *res = count - auio.uio_resid; 2031 return (error); 2032 } 2033 2034 /* 2035 * readlink_args(char *path, char *buf, int count) 2036 * 2037 * Return target name of a symbolic link. 2038 */ 2039 int 2040 readlink(struct readlink_args *uap) 2041 { 2042 struct nlookupdata nd; 2043 int error; 2044 2045 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2046 if (error == 0) { 2047 error = kern_readlink(&nd, uap->buf, uap->count, 2048 &uap->sysmsg_result); 2049 } 2050 nlookup_done(&nd); 2051 return (error); 2052 } 2053 2054 static int 2055 setfflags(struct vnode *vp, int flags) 2056 { 2057 struct thread *td = curthread; 2058 struct proc *p = td->td_proc; 2059 int error; 2060 struct vattr vattr; 2061 2062 /* 2063 * Prevent non-root users from setting flags on devices. When 2064 * a device is reused, users can retain ownership of the device 2065 * if they are allowed to set flags and programs assume that 2066 * chown can't fail when done as root. 2067 */ 2068 if ((vp->v_type == VCHR || vp->v_type == VBLK) && 2069 ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)) 2070 return (error); 2071 2072 /* 2073 * note: vget is required for any operation that might mod the vnode 2074 * so VINACTIVE is properly cleared. 2075 */ 2076 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 2077 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) { 2078 VATTR_NULL(&vattr); 2079 vattr.va_flags = flags; 2080 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); 2081 vput(vp); 2082 } 2083 return (error); 2084 } 2085 2086 /* 2087 * chflags(char *path, int flags) 2088 * 2089 * Change flags of a file given a path name. 2090 */ 2091 /* ARGSUSED */ 2092 int 2093 chflags(struct chflags_args *uap) 2094 { 2095 struct nlookupdata nd; 2096 struct vnode *vp; 2097 int error; 2098 2099 vp = NULL; 2100 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 2101 /* XXX Add NLC flag indicating modifying operation? */ 2102 if (error == 0) 2103 error = nlookup(&nd); 2104 if (error == 0) 2105 error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); 2106 nlookup_done(&nd); 2107 if (error == 0) { 2108 error = setfflags(vp, SCARG(uap, flags)); 2109 vrele(vp); 2110 } 2111 return (error); 2112 } 2113 2114 /* 2115 * fchflags_args(int fd, int flags) 2116 * 2117 * Change flags of a file given a file descriptor. 2118 */ 2119 /* ARGSUSED */ 2120 int 2121 fchflags(struct fchflags_args *uap) 2122 { 2123 struct thread *td = curthread; 2124 struct proc *p = td->td_proc; 2125 struct file *fp; 2126 int error; 2127 2128 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2129 return (error); 2130 return setfflags((struct vnode *) fp->f_data, SCARG(uap, flags)); 2131 } 2132 2133 static int 2134 setfmode(struct vnode *vp, int mode) 2135 { 2136 struct thread *td = curthread; 2137 struct proc *p = td->td_proc; 2138 int error; 2139 struct vattr vattr; 2140 2141 /* 2142 * note: vget is required for any operation that might mod the vnode 2143 * so VINACTIVE is properly cleared. 2144 */ 2145 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 2146 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) { 2147 VATTR_NULL(&vattr); 2148 vattr.va_mode = mode & ALLPERMS; 2149 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); 2150 vput(vp); 2151 } 2152 return error; 2153 } 2154 2155 int 2156 kern_chmod(struct nlookupdata *nd, int mode) 2157 { 2158 struct vnode *vp; 2159 int error; 2160 2161 /* XXX Add NLC flag indicating modifying operation? */ 2162 if ((error = nlookup(nd)) != 0) 2163 return (error); 2164 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) 2165 return (error); 2166 error = setfmode(vp, mode); 2167 vrele(vp); 2168 return (error); 2169 } 2170 2171 /* 2172 * chmod_args(char *path, int mode) 2173 * 2174 * Change mode of a file given path name. 2175 */ 2176 /* ARGSUSED */ 2177 int 2178 chmod(struct chmod_args *uap) 2179 { 2180 struct nlookupdata nd; 2181 int error; 2182 2183 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2184 if (error == 0) 2185 error = kern_chmod(&nd, uap->mode); 2186 nlookup_done(&nd); 2187 return (error); 2188 } 2189 2190 /* 2191 * lchmod_args(char *path, int mode) 2192 * 2193 * Change mode of a file given path name (don't follow links.) 2194 */ 2195 /* ARGSUSED */ 2196 int 2197 lchmod(struct lchmod_args *uap) 2198 { 2199 struct nlookupdata nd; 2200 int error; 2201 2202 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2203 if (error == 0) 2204 error = kern_chmod(&nd, uap->mode); 2205 nlookup_done(&nd); 2206 return (error); 2207 } 2208 2209 /* 2210 * fchmod_args(int fd, int mode) 2211 * 2212 * Change mode of a file given a file descriptor. 2213 */ 2214 /* ARGSUSED */ 2215 int 2216 fchmod(struct fchmod_args *uap) 2217 { 2218 struct thread *td = curthread; 2219 struct proc *p = td->td_proc; 2220 struct file *fp; 2221 int error; 2222 2223 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2224 return (error); 2225 return setfmode((struct vnode *)fp->f_data, SCARG(uap, mode)); 2226 } 2227 2228 static int 2229 setfown(struct vnode *vp, uid_t uid, gid_t gid) 2230 { 2231 struct thread *td = curthread; 2232 struct proc *p = td->td_proc; 2233 int error; 2234 struct vattr vattr; 2235 2236 /* 2237 * note: vget is required for any operation that might mod the vnode 2238 * so VINACTIVE is properly cleared. 2239 */ 2240 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 2241 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) { 2242 VATTR_NULL(&vattr); 2243 vattr.va_uid = uid; 2244 vattr.va_gid = gid; 2245 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); 2246 vput(vp); 2247 } 2248 return error; 2249 } 2250 2251 int 2252 kern_chown(struct nlookupdata *nd, int uid, int gid) 2253 { 2254 struct vnode *vp; 2255 int error; 2256 2257 /* XXX Add NLC flag indicating modifying operation? */ 2258 if ((error = nlookup(nd)) != 0) 2259 return (error); 2260 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) 2261 return (error); 2262 error = setfown(vp, uid, gid); 2263 vrele(vp); 2264 return (error); 2265 } 2266 2267 /* 2268 * chown(char *path, int uid, int gid) 2269 * 2270 * Set ownership given a path name. 2271 */ 2272 int 2273 chown(struct chown_args *uap) 2274 { 2275 struct nlookupdata nd; 2276 int error; 2277 2278 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2279 if (error == 0) 2280 error = kern_chown(&nd, uap->uid, uap->gid); 2281 nlookup_done(&nd); 2282 return (error); 2283 } 2284 2285 /* 2286 * lchown_args(char *path, int uid, int gid) 2287 * 2288 * Set ownership given a path name, do not cross symlinks. 2289 */ 2290 int 2291 lchown(struct lchown_args *uap) 2292 { 2293 struct nlookupdata nd; 2294 int error; 2295 2296 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2297 if (error == 0) 2298 error = kern_chown(&nd, uap->uid, uap->gid); 2299 nlookup_done(&nd); 2300 return (error); 2301 } 2302 2303 /* 2304 * fchown_args(int fd, int uid, int gid) 2305 * 2306 * Set ownership given a file descriptor. 2307 */ 2308 /* ARGSUSED */ 2309 int 2310 fchown(struct fchown_args *uap) 2311 { 2312 struct thread *td = curthread; 2313 struct proc *p = td->td_proc; 2314 struct file *fp; 2315 int error; 2316 2317 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2318 return (error); 2319 return setfown((struct vnode *)fp->f_data, 2320 SCARG(uap, uid), SCARG(uap, gid)); 2321 } 2322 2323 static int 2324 getutimes(const struct timeval *tvp, struct timespec *tsp) 2325 { 2326 struct timeval tv[2]; 2327 2328 if (tvp == NULL) { 2329 microtime(&tv[0]); 2330 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 2331 tsp[1] = tsp[0]; 2332 } else { 2333 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2334 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2335 } 2336 return 0; 2337 } 2338 2339 static int 2340 setutimes(struct vnode *vp, const struct timespec *ts, int nullflag) 2341 { 2342 struct thread *td = curthread; 2343 struct proc *p = td->td_proc; 2344 int error; 2345 struct vattr vattr; 2346 2347 /* 2348 * note: vget is required for any operation that might mod the vnode 2349 * so VINACTIVE is properly cleared. 2350 */ 2351 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 2352 if ((error = vget(vp, LK_EXCLUSIVE, td)) == 0) { 2353 VATTR_NULL(&vattr); 2354 vattr.va_atime = ts[0]; 2355 vattr.va_mtime = ts[1]; 2356 if (nullflag) 2357 vattr.va_vaflags |= VA_UTIMES_NULL; 2358 error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); 2359 vput(vp); 2360 } 2361 return error; 2362 } 2363 2364 int 2365 kern_utimes(struct nlookupdata *nd, struct timeval *tptr) 2366 { 2367 struct timespec ts[2]; 2368 struct vnode *vp; 2369 int error; 2370 2371 if ((error = getutimes(tptr, ts)) != 0) 2372 return (error); 2373 /* XXX Add NLC flag indicating modifying operation? */ 2374 if ((error = nlookup(nd)) != 0) 2375 return (error); 2376 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) 2377 return (error); 2378 error = setutimes(vp, ts, tptr == NULL); 2379 vrele(vp); 2380 return (error); 2381 } 2382 2383 /* 2384 * utimes_args(char *path, struct timeval *tptr) 2385 * 2386 * Set the access and modification times of a file. 2387 */ 2388 int 2389 utimes(struct utimes_args *uap) 2390 { 2391 struct timeval tv[2]; 2392 struct nlookupdata nd; 2393 int error; 2394 2395 if (uap->tptr) { 2396 error = copyin(uap->tptr, tv, sizeof(tv)); 2397 if (error) 2398 return (error); 2399 } 2400 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2401 if (error == 0) 2402 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 2403 nlookup_done(&nd); 2404 return (error); 2405 } 2406 2407 /* 2408 * lutimes_args(char *path, struct timeval *tptr) 2409 * 2410 * Set the access and modification times of a file. 2411 */ 2412 int 2413 lutimes(struct lutimes_args *uap) 2414 { 2415 struct timeval tv[2]; 2416 struct nlookupdata nd; 2417 int error; 2418 2419 if (uap->tptr) { 2420 error = copyin(uap->tptr, tv, sizeof(tv)); 2421 if (error) 2422 return (error); 2423 } 2424 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2425 if (error == 0) 2426 error = kern_utimes(&nd, uap->tptr ? tv : NULL); 2427 nlookup_done(&nd); 2428 return (error); 2429 } 2430 2431 int 2432 kern_futimes(int fd, struct timeval *tptr) 2433 { 2434 struct thread *td = curthread; 2435 struct proc *p = td->td_proc; 2436 struct timespec ts[2]; 2437 struct file *fp; 2438 int error; 2439 2440 error = getutimes(tptr, ts); 2441 if (error) 2442 return (error); 2443 error = getvnode(p->p_fd, fd, &fp); 2444 if (error) 2445 return (error); 2446 error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL); 2447 return (error); 2448 } 2449 2450 /* 2451 * futimes_args(int fd, struct timeval *tptr) 2452 * 2453 * Set the access and modification times of a file. 2454 */ 2455 int 2456 futimes(struct futimes_args *uap) 2457 { 2458 struct timeval tv[2]; 2459 int error; 2460 2461 if (uap->tptr) { 2462 error = copyin(uap->tptr, tv, sizeof(tv)); 2463 if (error) 2464 return (error); 2465 } 2466 2467 error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); 2468 2469 return (error); 2470 } 2471 2472 int 2473 kern_truncate(struct nlookupdata *nd, off_t length) 2474 { 2475 struct vnode *vp; 2476 struct vattr vattr; 2477 int error; 2478 2479 if (length < 0) 2480 return(EINVAL); 2481 /* XXX Add NLC flag indicating modifying operation? */ 2482 if ((error = nlookup(nd)) != 0) 2483 return (error); 2484 if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) 2485 return (error); 2486 VOP_LEASE(vp, nd->nl_td, nd->nl_cred, LEASE_WRITE); 2487 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, nd->nl_td)) != 0) { 2488 vrele(vp); 2489 return (error); 2490 } 2491 if (vp->v_type == VDIR) { 2492 error = EISDIR; 2493 } else if ((error = vn_writechk(vp)) == 0 && 2494 (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred, nd->nl_td)) == 0) { 2495 VATTR_NULL(&vattr); 2496 vattr.va_size = length; 2497 error = VOP_SETATTR(vp, &vattr, nd->nl_cred, nd->nl_td); 2498 } 2499 vput(vp); 2500 return (error); 2501 } 2502 2503 /* 2504 * truncate(char *path, int pad, off_t length) 2505 * 2506 * Truncate a file given its path name. 2507 */ 2508 int 2509 truncate(struct truncate_args *uap) 2510 { 2511 struct nlookupdata nd; 2512 int error; 2513 2514 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 2515 if (error == 0) 2516 error = kern_truncate(&nd, uap->length); 2517 nlookup_done(&nd); 2518 return error; 2519 } 2520 2521 int 2522 kern_ftruncate(int fd, off_t length) 2523 { 2524 struct thread *td = curthread; 2525 struct proc *p = td->td_proc; 2526 struct vattr vattr; 2527 struct vnode *vp; 2528 struct file *fp; 2529 int error; 2530 2531 if (length < 0) 2532 return(EINVAL); 2533 if ((error = getvnode(p->p_fd, fd, &fp)) != 0) 2534 return (error); 2535 if ((fp->f_flag & FWRITE) == 0) 2536 return (EINVAL); 2537 vp = (struct vnode *)fp->f_data; 2538 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 2539 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2540 if (vp->v_type == VDIR) 2541 error = EISDIR; 2542 else if ((error = vn_writechk(vp)) == 0) { 2543 VATTR_NULL(&vattr); 2544 vattr.va_size = length; 2545 error = VOP_SETATTR(vp, &vattr, fp->f_cred, td); 2546 } 2547 VOP_UNLOCK(vp, 0, td); 2548 return (error); 2549 } 2550 2551 /* 2552 * ftruncate_args(int fd, int pad, off_t length) 2553 * 2554 * Truncate a file given a file descriptor. 2555 */ 2556 int 2557 ftruncate(struct ftruncate_args *uap) 2558 { 2559 int error; 2560 2561 error = kern_ftruncate(uap->fd, uap->length); 2562 2563 return (error); 2564 } 2565 2566 /* 2567 * fsync(int fd) 2568 * 2569 * Sync an open file. 2570 */ 2571 /* ARGSUSED */ 2572 int 2573 fsync(struct fsync_args *uap) 2574 { 2575 struct thread *td = curthread; 2576 struct proc *p = td->td_proc; 2577 struct vnode *vp; 2578 struct file *fp; 2579 vm_object_t obj; 2580 int error; 2581 2582 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2583 return (error); 2584 vp = (struct vnode *)fp->f_data; 2585 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2586 if (VOP_GETVOBJECT(vp, &obj) == 0) 2587 vm_object_page_clean(obj, 0, 0, 0); 2588 if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) == 0 && 2589 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) && 2590 bioops.io_fsync) 2591 error = (*bioops.io_fsync)(vp); 2592 VOP_UNLOCK(vp, 0, td); 2593 return (error); 2594 } 2595 2596 int 2597 kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond) 2598 { 2599 struct namecache *fncpd; 2600 struct namecache *tncpd; 2601 struct namecache *ncp; 2602 struct mount *mp; 2603 int error; 2604 2605 bwillwrite(); 2606 if ((error = nlookup(fromnd)) != 0) 2607 return (error); 2608 if ((fncpd = fromnd->nl_ncp->nc_parent) == NULL) 2609 return (ENOENT); 2610 cache_hold(fncpd); 2611 2612 /* 2613 * unlock the source ncp so we can lookup the target ncp without 2614 * deadlocking. The target may or may not exist so we do not check 2615 * for a target vp like kern_mkdir() and other creation functions do. 2616 * 2617 * The source and target directories are ref'd and rechecked after 2618 * everything is relocked to determine if the source or target file 2619 * has been renamed. 2620 */ 2621 KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED); 2622 fromnd->nl_flags &= ~NLC_NCPISLOCKED; 2623 cache_unlock(fromnd->nl_ncp); 2624 2625 tond->nl_flags |= NLC_CREATE; 2626 if ((error = nlookup(tond)) != 0) { 2627 cache_drop(fncpd); 2628 return (error); 2629 } 2630 if ((tncpd = tond->nl_ncp->nc_parent) == NULL) { 2631 cache_drop(fncpd); 2632 return (ENOENT); 2633 } 2634 cache_hold(tncpd); 2635 2636 /* 2637 * If the source and target are the same there is nothing to do 2638 */ 2639 if (fromnd->nl_ncp == tond->nl_ncp) { 2640 cache_drop(fncpd); 2641 cache_drop(tncpd); 2642 return (0); 2643 } 2644 2645 /* 2646 * relock the source ncp 2647 */ 2648 if (cache_lock_nonblock(fromnd->nl_ncp) == 0) { 2649 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); 2650 } else if (fromnd->nl_ncp > tond->nl_ncp) { 2651 cache_lock(fromnd->nl_ncp); 2652 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); 2653 } else { 2654 cache_unlock(tond->nl_ncp); 2655 cache_lock(fromnd->nl_ncp); 2656 cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); 2657 cache_lock(tond->nl_ncp); 2658 cache_resolve(tond->nl_ncp, tond->nl_cred); 2659 } 2660 fromnd->nl_flags |= NLC_NCPISLOCKED; 2661 2662 /* 2663 * make sure the parent directories linkages are the same 2664 */ 2665 if (fncpd != fromnd->nl_ncp->nc_parent || 2666 tncpd != tond->nl_ncp->nc_parent) { 2667 cache_drop(fncpd); 2668 cache_drop(tncpd); 2669 return (ENOENT); 2670 } 2671 2672 /* 2673 * Both the source and target must be within the same filesystem and 2674 * in the same filesystem as their parent directories within the 2675 * namecache topology. 2676 */ 2677 mp = fncpd->nc_mount; 2678 if (mp != tncpd->nc_mount || mp != fromnd->nl_ncp->nc_mount || 2679 mp != tond->nl_ncp->nc_mount) { 2680 cache_drop(fncpd); 2681 cache_drop(tncpd); 2682 return (EXDEV); 2683 } 2684 2685 /* 2686 * If the target exists and either the source or target is a directory, 2687 * then both must be directories. 2688 */ 2689 if (tond->nl_ncp->nc_vp) { 2690 if (fromnd->nl_ncp->nc_vp->v_type == VDIR) { 2691 if (tond->nl_ncp->nc_vp->v_type != VDIR) 2692 error = ENOTDIR; 2693 } else if (tond->nl_ncp->nc_vp->v_type == VDIR) { 2694 error = EISDIR; 2695 } 2696 } 2697 2698 /* 2699 * You cannot rename a source into itself or a subdirectory of itself. 2700 * We check this by travsersing the target directory upwards looking 2701 * for a match against the source. 2702 */ 2703 if (error == 0) { 2704 for (ncp = tncpd; ncp; ncp = ncp->nc_parent) { 2705 if (fromnd->nl_ncp == ncp) { 2706 error = EINVAL; 2707 break; 2708 } 2709 } 2710 } 2711 2712 cache_drop(fncpd); 2713 cache_drop(tncpd); 2714 if (error) 2715 return (error); 2716 error = VOP_NRENAME(fromnd->nl_ncp, tond->nl_ncp, tond->nl_cred); 2717 return (error); 2718 } 2719 2720 /* 2721 * rename_args(char *from, char *to) 2722 * 2723 * Rename files. Source and destination must either both be directories, 2724 * or both not be directories. If target is a directory, it must be empty. 2725 */ 2726 int 2727 rename(struct rename_args *uap) 2728 { 2729 struct nlookupdata fromnd, tond; 2730 int error; 2731 2732 error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0); 2733 if (error == 0) { 2734 error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0); 2735 if (error == 0) 2736 error = kern_rename(&fromnd, &tond); 2737 nlookup_done(&tond); 2738 } 2739 nlookup_done(&fromnd); 2740 return (error); 2741 } 2742 2743 int 2744 kern_mkdir(struct nlookupdata *nd, int mode) 2745 { 2746 struct thread *td = curthread; 2747 struct proc *p = td->td_proc; 2748 struct namecache *ncp; 2749 struct vnode *vp; 2750 struct vattr vattr; 2751 int error; 2752 2753 bwillwrite(); 2754 nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE; 2755 if ((error = nlookup(nd)) != 0) 2756 return (error); 2757 2758 ncp = nd->nl_ncp; 2759 if (ncp->nc_vp) 2760 return (EEXIST); 2761 2762 VATTR_NULL(&vattr); 2763 vattr.va_type = VDIR; 2764 vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2765 2766 vp = NULL; 2767 error = VOP_NMKDIR(ncp, &vp, p->p_ucred, &vattr); 2768 if (error == 0) 2769 vput(vp); 2770 return (error); 2771 } 2772 2773 /* 2774 * mkdir_args(char *path, int mode) 2775 * 2776 * Make a directory file. 2777 */ 2778 /* ARGSUSED */ 2779 int 2780 mkdir(struct mkdir_args *uap) 2781 { 2782 struct nlookupdata nd; 2783 int error; 2784 2785 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2786 if (error == 0) 2787 error = kern_mkdir(&nd, uap->mode); 2788 nlookup_done(&nd); 2789 return (error); 2790 } 2791 2792 int 2793 kern_rmdir(struct nlookupdata *nd) 2794 { 2795 struct namecache *ncp; 2796 int error; 2797 2798 bwillwrite(); 2799 nd->nl_flags |= NLC_DELETE; 2800 if ((error = nlookup(nd)) != 0) 2801 return (error); 2802 2803 ncp = nd->nl_ncp; 2804 error = VOP_NRMDIR(ncp, nd->nl_cred); 2805 return (error); 2806 } 2807 2808 /* 2809 * rmdir_args(char *path) 2810 * 2811 * Remove a directory file. 2812 */ 2813 /* ARGSUSED */ 2814 int 2815 rmdir(struct rmdir_args *uap) 2816 { 2817 struct nlookupdata nd; 2818 int error; 2819 2820 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); 2821 if (error == 0) 2822 error = kern_rmdir(&nd); 2823 nlookup_done(&nd); 2824 return (error); 2825 } 2826 2827 int 2828 kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res) 2829 { 2830 struct thread *td = curthread; 2831 struct proc *p = td->td_proc; 2832 struct vnode *vp; 2833 struct file *fp; 2834 struct uio auio; 2835 struct iovec aiov; 2836 long loff; 2837 int error, eofflag; 2838 2839 if ((error = getvnode(p->p_fd, fd, &fp)) != 0) 2840 return (error); 2841 if ((fp->f_flag & FREAD) == 0) 2842 return (EBADF); 2843 vp = (struct vnode *)fp->f_data; 2844 unionread: 2845 if (vp->v_type != VDIR) 2846 return (EINVAL); 2847 aiov.iov_base = buf; 2848 aiov.iov_len = count; 2849 auio.uio_iov = &aiov; 2850 auio.uio_iovcnt = 1; 2851 auio.uio_rw = UIO_READ; 2852 auio.uio_segflg = UIO_USERSPACE; 2853 auio.uio_td = td; 2854 auio.uio_resid = count; 2855 /* vn_lock(vp, LK_SHARED | LK_RETRY, td); */ 2856 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2857 loff = auio.uio_offset = fp->f_offset; 2858 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); 2859 fp->f_offset = auio.uio_offset; 2860 VOP_UNLOCK(vp, 0, td); 2861 if (error) 2862 return (error); 2863 if (count == auio.uio_resid) { 2864 if (union_dircheckp) { 2865 error = union_dircheckp(td, &vp, fp); 2866 if (error == -1) 2867 goto unionread; 2868 if (error) 2869 return (error); 2870 } 2871 if ((vp->v_flag & VROOT) && 2872 (vp->v_mount->mnt_flag & MNT_UNION)) { 2873 struct vnode *tvp = vp; 2874 vp = vp->v_mount->mnt_vnodecovered; 2875 vref(vp); 2876 fp->f_data = (caddr_t)vp; 2877 fp->f_offset = 0; 2878 vrele(tvp); 2879 goto unionread; 2880 } 2881 } 2882 if (basep) { 2883 *basep = loff; 2884 } 2885 *res = count - auio.uio_resid; 2886 return (error); 2887 } 2888 2889 /* 2890 * getdirentries_args(int fd, char *buf, u_int conut, long *basep) 2891 * 2892 * Read a block of directory entries in a file system independent format. 2893 */ 2894 int 2895 getdirentries(struct getdirentries_args *uap) 2896 { 2897 long base; 2898 int error; 2899 2900 error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, 2901 &uap->sysmsg_result); 2902 2903 if (error == 0) 2904 error = copyout(&base, uap->basep, sizeof(*uap->basep)); 2905 return (error); 2906 } 2907 2908 /* 2909 * getdents_args(int fd, char *buf, size_t count) 2910 */ 2911 int 2912 getdents(struct getdents_args *uap) 2913 { 2914 int error; 2915 2916 error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, 2917 &uap->sysmsg_result); 2918 2919 return (error); 2920 } 2921 2922 /* 2923 * umask(int newmask) 2924 * 2925 * Set the mode mask for creation of filesystem nodes. 2926 * 2927 * MP SAFE 2928 */ 2929 int 2930 umask(struct umask_args *uap) 2931 { 2932 struct thread *td = curthread; 2933 struct proc *p = td->td_proc; 2934 struct filedesc *fdp; 2935 2936 fdp = p->p_fd; 2937 uap->sysmsg_result = fdp->fd_cmask; 2938 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2939 return (0); 2940 } 2941 2942 /* 2943 * revoke(char *path) 2944 * 2945 * Void all references to file by ripping underlying filesystem 2946 * away from vnode. 2947 */ 2948 /* ARGSUSED */ 2949 int 2950 revoke(struct revoke_args *uap) 2951 { 2952 struct thread *td = curthread; 2953 struct nlookupdata nd; 2954 struct vattr vattr; 2955 struct vnode *vp; 2956 struct ucred *cred; 2957 int error; 2958 2959 vp = NULL; 2960 error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); 2961 if (error == 0) 2962 error = nlookup(&nd); 2963 if (error == 0) 2964 error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); 2965 cred = crhold(nd.nl_cred); 2966 nlookup_done(&nd); 2967 if (error == 0) { 2968 if (vp->v_type != VCHR && vp->v_type != VBLK) 2969 error = EINVAL; 2970 if (error == 0) 2971 error = VOP_GETATTR(vp, &vattr, td); 2972 if (error == 0 && cred->cr_uid != vattr.va_uid) 2973 error = suser_cred(cred, PRISON_ROOT); 2974 if (error == 0 && count_udev(vp->v_udev) > 0) { 2975 if ((error = vx_lock(vp)) == 0) { 2976 VOP_REVOKE(vp, REVOKEALL); 2977 vx_unlock(vp); 2978 } 2979 } 2980 vrele(vp); 2981 } 2982 crfree(cred); 2983 return (error); 2984 } 2985 2986 /* 2987 * Convert a user file descriptor to a kernel file entry. 2988 */ 2989 int 2990 getvnode(struct filedesc *fdp, int fd, struct file **fpp) 2991 { 2992 struct file *fp; 2993 2994 if ((u_int)fd >= fdp->fd_nfiles || 2995 (fp = fdp->fd_ofiles[fd]) == NULL) 2996 return (EBADF); 2997 if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) 2998 return (EINVAL); 2999 *fpp = fp; 3000 return (0); 3001 } 3002 /* 3003 * getfh_args(char *fname, fhandle_t *fhp) 3004 * 3005 * Get (NFS) file handle 3006 */ 3007 int 3008 getfh(struct getfh_args *uap) 3009 { 3010 struct thread *td = curthread; 3011 struct nlookupdata nd; 3012 fhandle_t fh; 3013 struct vnode *vp; 3014 int error; 3015 3016 /* 3017 * Must be super user 3018 */ 3019 if ((error = suser(td)) != 0) 3020 return (error); 3021 3022 vp = NULL; 3023 error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW); 3024 if (error == 0) 3025 error = nlookup(&nd); 3026 if (error == 0) 3027 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 3028 nlookup_done(&nd); 3029 if (error == 0) { 3030 bzero(&fh, sizeof(fh)); 3031 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 3032 error = VFS_VPTOFH(vp, &fh.fh_fid); 3033 vput(vp); 3034 if (error == 0) 3035 error = copyout(&fh, uap->fhp, sizeof(fh)); 3036 } 3037 return (error); 3038 } 3039 3040 /* 3041 * fhopen_args(const struct fhandle *u_fhp, int flags) 3042 * 3043 * syscall for the rpc.lockd to use to translate a NFS file handle into 3044 * an open descriptor. 3045 * 3046 * warning: do not remove the suser() call or this becomes one giant 3047 * security hole. 3048 */ 3049 int 3050 fhopen(struct fhopen_args *uap) 3051 { 3052 struct thread *td = curthread; 3053 struct proc *p = td->td_proc; 3054 struct mount *mp; 3055 struct vnode *vp; 3056 struct fhandle fhp; 3057 struct vattr vat; 3058 struct vattr *vap = &vat; 3059 struct flock lf; 3060 struct filedesc *fdp = p->p_fd; 3061 int fmode, mode, error, type; 3062 struct file *nfp; 3063 struct file *fp; 3064 int indx; 3065 3066 /* 3067 * Must be super user 3068 */ 3069 error = suser(td); 3070 if (error) 3071 return (error); 3072 3073 fmode = FFLAGS(SCARG(uap, flags)); 3074 /* why not allow a non-read/write open for our lockd? */ 3075 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 3076 return (EINVAL); 3077 error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp)); 3078 if (error) 3079 return(error); 3080 /* find the mount point */ 3081 mp = vfs_getvfs(&fhp.fh_fsid); 3082 if (mp == NULL) 3083 return (ESTALE); 3084 /* now give me my vnode, it gets returned to me locked */ 3085 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); 3086 if (error) 3087 return (error); 3088 /* 3089 * from now on we have to make sure not 3090 * to forget about the vnode 3091 * any error that causes an abort must vput(vp) 3092 * just set error = err and 'goto bad;'. 3093 */ 3094 3095 /* 3096 * from vn_open 3097 */ 3098 if (vp->v_type == VLNK) { 3099 error = EMLINK; 3100 goto bad; 3101 } 3102 if (vp->v_type == VSOCK) { 3103 error = EOPNOTSUPP; 3104 goto bad; 3105 } 3106 mode = 0; 3107 if (fmode & (FWRITE | O_TRUNC)) { 3108 if (vp->v_type == VDIR) { 3109 error = EISDIR; 3110 goto bad; 3111 } 3112 error = vn_writechk(vp); 3113 if (error) 3114 goto bad; 3115 mode |= VWRITE; 3116 } 3117 if (fmode & FREAD) 3118 mode |= VREAD; 3119 if (mode) { 3120 error = VOP_ACCESS(vp, mode, p->p_ucred, td); 3121 if (error) 3122 goto bad; 3123 } 3124 if (fmode & O_TRUNC) { 3125 VOP_UNLOCK(vp, 0, td); /* XXX */ 3126 VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); 3127 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */ 3128 VATTR_NULL(vap); 3129 vap->va_size = 0; 3130 error = VOP_SETATTR(vp, vap, p->p_ucred, td); 3131 if (error) 3132 goto bad; 3133 } 3134 3135 /* 3136 * VOP_OPEN needs the file pointer so it can potentially override 3137 * it. 3138 * 3139 * WARNING! no f_ncp will be associated when fhopen()ing a directory. 3140 * XXX 3141 */ 3142 if ((error = falloc(p, &nfp, NULL)) != 0) 3143 goto bad; 3144 fp = nfp; 3145 3146 fp->f_data = (caddr_t)vp; 3147 fp->f_flag = fmode & FMASK; 3148 fp->f_ops = &vnode_fileops; 3149 fp->f_type = DTYPE_VNODE; 3150 3151 error = VOP_OPEN(vp, fmode, p->p_ucred, fp, td); 3152 if (error) { 3153 /* 3154 * setting f_ops this way prevents VOP_CLOSE from being 3155 * called or fdrop() releasing the vp from v_data. Since 3156 * the VOP_OPEN failed we don't want to VOP_CLOSE. 3157 */ 3158 fp->f_ops = &badfileops; 3159 fp->f_data = NULL; 3160 fdrop(fp, td); 3161 goto bad; 3162 } 3163 if (fmode & FWRITE) 3164 vp->v_writecount++; 3165 3166 /* 3167 * The fp now owns a reference on the vnode. We still have our own 3168 * ref+lock. 3169 */ 3170 vref(vp); 3171 3172 /* 3173 * Make sure that a VM object is created for VMIO support. If this 3174 * fails just fdrop() normally to clean up. 3175 */ 3176 if (vn_canvmio(vp) == TRUE) { 3177 if ((error = vfs_object_create(vp, td)) != 0) { 3178 fdrop(fp, td); 3179 goto bad; 3180 } 3181 } 3182 3183 /* 3184 * The open was successful, associate it with a file descriptor. 3185 */ 3186 if ((error = fsetfd(p, fp, &indx)) != 0) { 3187 if (fmode & FWRITE) 3188 vp->v_writecount--; 3189 fdrop(fp, td); 3190 goto bad; 3191 } 3192 3193 if (fmode & (O_EXLOCK | O_SHLOCK)) { 3194 lf.l_whence = SEEK_SET; 3195 lf.l_start = 0; 3196 lf.l_len = 0; 3197 if (fmode & O_EXLOCK) 3198 lf.l_type = F_WRLCK; 3199 else 3200 lf.l_type = F_RDLCK; 3201 type = F_FLOCK; 3202 if ((fmode & FNONBLOCK) == 0) 3203 type |= F_WAIT; 3204 VOP_UNLOCK(vp, 0, td); 3205 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { 3206 /* 3207 * lock request failed. Normally close the descriptor 3208 * but handle the case where someone might have dup()d 3209 * or close()d it when we weren't looking. 3210 */ 3211 if (fdp->fd_ofiles[indx] == fp) { 3212 fdp->fd_ofiles[indx] = NULL; 3213 fdrop(fp, td); 3214 } 3215 3216 /* 3217 * release our private reference. 3218 */ 3219 fdrop(fp, td); 3220 vrele(vp); 3221 return (error); 3222 } 3223 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3224 fp->f_flag |= FHASLOCK; 3225 } 3226 if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0)) 3227 vfs_object_create(vp, td); 3228 3229 vput(vp); 3230 fdrop(fp, td); 3231 uap->sysmsg_result = indx; 3232 return (0); 3233 3234 bad: 3235 vput(vp); 3236 return (error); 3237 } 3238 3239 /* 3240 * fhstat_args(struct fhandle *u_fhp, struct stat *sb) 3241 */ 3242 int 3243 fhstat(struct fhstat_args *uap) 3244 { 3245 struct thread *td = curthread; 3246 struct stat sb; 3247 fhandle_t fh; 3248 struct mount *mp; 3249 struct vnode *vp; 3250 int error; 3251 3252 /* 3253 * Must be super user 3254 */ 3255 error = suser(td); 3256 if (error) 3257 return (error); 3258 3259 error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t)); 3260 if (error) 3261 return (error); 3262 3263 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3264 return (ESTALE); 3265 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 3266 return (error); 3267 error = vn_stat(vp, &sb, td); 3268 vput(vp); 3269 if (error) 3270 return (error); 3271 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 3272 return (error); 3273 } 3274 3275 /* 3276 * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) 3277 */ 3278 int 3279 fhstatfs(struct fhstatfs_args *uap) 3280 { 3281 struct thread *td = curthread; 3282 struct statfs *sp; 3283 struct mount *mp; 3284 struct vnode *vp; 3285 struct statfs sb; 3286 fhandle_t fh; 3287 int error; 3288 3289 /* 3290 * Must be super user 3291 */ 3292 if ((error = suser(td))) 3293 return (error); 3294 3295 if ((error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t))) != 0) 3296 return (error); 3297 3298 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3299 return (ESTALE); 3300 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 3301 return (error); 3302 mp = vp->v_mount; 3303 sp = &mp->mnt_stat; 3304 vput(vp); 3305 if ((error = VFS_STATFS(mp, sp, td)) != 0) 3306 return (error); 3307 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 3308 if (suser(td)) { 3309 bcopy(sp, &sb, sizeof(sb)); 3310 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 3311 sp = &sb; 3312 } 3313 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 3314 } 3315 3316 /* 3317 * Syscall to push extended attribute configuration information into the 3318 * VFS. Accepts a path, which it converts to a mountpoint, as well as 3319 * a command (int cmd), and attribute name and misc data. For now, the 3320 * attribute name is left in userspace for consumption by the VFS_op. 3321 * It will probably be changed to be copied into sysspace by the 3322 * syscall in the future, once issues with various consumers of the 3323 * attribute code have raised their hands. 3324 * 3325 * Currently this is used only by UFS Extended Attributes. 3326 */ 3327 int 3328 extattrctl(struct extattrctl_args *uap) 3329 { 3330 struct nlookupdata nd; 3331 struct mount *mp; 3332 struct vnode *vp; 3333 int error; 3334 3335 vp = NULL; 3336 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3337 if (error == 0) 3338 error = nlookup(&nd); 3339 if (error == 0) { 3340 mp = nd.nl_ncp->nc_mount; 3341 error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), 3342 SCARG(uap, attrname), SCARG(uap, arg), 3343 nd.nl_td); 3344 } 3345 nlookup_done(&nd); 3346 return (error); 3347 } 3348 3349 /* 3350 * Syscall to set a named extended attribute on a file or directory. 3351 * Accepts attribute name, and a uio structure pointing to the data to set. 3352 * The uio is consumed in the style of writev(). The real work happens 3353 * in VOP_SETEXTATTR(). 3354 */ 3355 int 3356 extattr_set_file(struct extattr_set_file_args *uap) 3357 { 3358 char attrname[EXTATTR_MAXNAMELEN]; 3359 struct iovec aiov[UIO_SMALLIOV]; 3360 struct iovec *needfree; 3361 struct nlookupdata nd; 3362 struct iovec *iov; 3363 struct vnode *vp; 3364 struct uio auio; 3365 u_int iovlen; 3366 u_int cnt; 3367 int error; 3368 int i; 3369 3370 error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); 3371 if (error) 3372 return (error); 3373 3374 vp = NULL; 3375 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3376 if (error == 0) 3377 error = nlookup(&nd); 3378 if (error == 0) 3379 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 3380 if (error) { 3381 nlookup_done(&nd); 3382 return (error); 3383 } 3384 3385 needfree = NULL; 3386 iovlen = uap->iovcnt * sizeof(struct iovec); 3387 if (uap->iovcnt > UIO_SMALLIOV) { 3388 if (uap->iovcnt > UIO_MAXIOV) { 3389 error = EINVAL; 3390 goto done; 3391 } 3392 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 3393 needfree = iov; 3394 } else { 3395 iov = aiov; 3396 } 3397 auio.uio_iov = iov; 3398 auio.uio_iovcnt = uap->iovcnt; 3399 auio.uio_rw = UIO_WRITE; 3400 auio.uio_segflg = UIO_USERSPACE; 3401 auio.uio_td = nd.nl_td; 3402 auio.uio_offset = 0; 3403 if ((error = copyin(uap->iovp, iov, iovlen))) 3404 goto done; 3405 auio.uio_resid = 0; 3406 for (i = 0; i < uap->iovcnt; i++) { 3407 if (iov->iov_len > INT_MAX - auio.uio_resid) { 3408 error = EINVAL; 3409 goto done; 3410 } 3411 auio.uio_resid += iov->iov_len; 3412 iov++; 3413 } 3414 cnt = auio.uio_resid; 3415 error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred, nd.nl_td); 3416 cnt -= auio.uio_resid; 3417 uap->sysmsg_result = cnt; 3418 done: 3419 vput(vp); 3420 nlookup_done(&nd); 3421 if (needfree) 3422 FREE(needfree, M_IOV); 3423 return (error); 3424 } 3425 3426 /* 3427 * Syscall to get a named extended attribute on a file or directory. 3428 * Accepts attribute name, and a uio structure pointing to a buffer for the 3429 * data. The uio is consumed in the style of readv(). The real work 3430 * happens in VOP_GETEXTATTR(); 3431 */ 3432 int 3433 extattr_get_file(struct extattr_get_file_args *uap) 3434 { 3435 char attrname[EXTATTR_MAXNAMELEN]; 3436 struct iovec aiov[UIO_SMALLIOV]; 3437 struct iovec *needfree; 3438 struct nlookupdata nd; 3439 struct iovec *iov; 3440 struct vnode *vp; 3441 struct uio auio; 3442 u_int iovlen; 3443 u_int cnt; 3444 int error; 3445 int i; 3446 3447 error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); 3448 if (error) 3449 return (error); 3450 3451 vp = NULL; 3452 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3453 if (error == 0) 3454 error = nlookup(&nd); 3455 if (error == 0) 3456 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 3457 if (error) { 3458 nlookup_done(&nd); 3459 return (error); 3460 } 3461 3462 iovlen = uap->iovcnt * sizeof (struct iovec); 3463 needfree = NULL; 3464 if (uap->iovcnt > UIO_SMALLIOV) { 3465 if (uap->iovcnt > UIO_MAXIOV) { 3466 error = EINVAL; 3467 goto done; 3468 } 3469 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 3470 needfree = iov; 3471 } else { 3472 iov = aiov; 3473 } 3474 auio.uio_iov = iov; 3475 auio.uio_iovcnt = uap->iovcnt; 3476 auio.uio_rw = UIO_READ; 3477 auio.uio_segflg = UIO_USERSPACE; 3478 auio.uio_td = nd.nl_td; 3479 auio.uio_offset = 0; 3480 if ((error = copyin(uap->iovp, iov, iovlen))) 3481 goto done; 3482 auio.uio_resid = 0; 3483 for (i = 0; i < uap->iovcnt; i++) { 3484 if (iov->iov_len > INT_MAX - auio.uio_resid) { 3485 error = EINVAL; 3486 goto done; 3487 } 3488 auio.uio_resid += iov->iov_len; 3489 iov++; 3490 } 3491 cnt = auio.uio_resid; 3492 error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred, nd.nl_td); 3493 cnt -= auio.uio_resid; 3494 uap->sysmsg_result = cnt; 3495 done: 3496 vput(vp); 3497 nlookup_done(&nd); 3498 if (needfree) 3499 FREE(needfree, M_IOV); 3500 return(error); 3501 } 3502 3503 /* 3504 * Syscall to delete a named extended attribute from a file or directory. 3505 * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). 3506 */ 3507 int 3508 extattr_delete_file(struct extattr_delete_file_args *uap) 3509 { 3510 char attrname[EXTATTR_MAXNAMELEN]; 3511 struct nlookupdata nd; 3512 struct vnode *vp; 3513 int error; 3514 3515 error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); 3516 if (error) 3517 return(error); 3518 3519 vp = NULL; 3520 error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); 3521 if (error == 0) 3522 error = nlookup(&nd); 3523 if (error == 0) 3524 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 3525 if (error) { 3526 nlookup_done(&nd); 3527 return (error); 3528 } 3529 3530 error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred, nd.nl_td); 3531 vput(vp); 3532 nlookup_done(&nd); 3533 return(error); 3534 } 3535 3536 /* 3537 * print out statistics from the current status of the buffer pool 3538 * this can be toggeled by the system control option debug.syncprt 3539 */ 3540 #ifdef DEBUG 3541 void 3542 vfs_bufstats(void) 3543 { 3544 int s, i, j, count; 3545 struct buf *bp; 3546 struct bqueues *dp; 3547 int counts[(MAXBSIZE / PAGE_SIZE) + 1]; 3548 static char *bname[3] = { "LOCKED", "LRU", "AGE" }; 3549 3550 for (dp = bufqueues, i = 0; dp < &bufqueues[3]; dp++, i++) { 3551 count = 0; 3552 for (j = 0; j <= MAXBSIZE/PAGE_SIZE; j++) 3553 counts[j] = 0; 3554 s = splbio(); 3555 TAILQ_FOREACH(bp, dp, b_freelist) { 3556 counts[bp->b_bufsize/PAGE_SIZE]++; 3557 count++; 3558 } 3559 splx(s); 3560 printf("%s: total-%d", bname[i], count); 3561 for (j = 0; j <= MAXBSIZE/PAGE_SIZE; j++) 3562 if (counts[j] != 0) 3563 printf(", %d-%d", j * PAGE_SIZE, counts[j]); 3564 printf("\n"); 3565 } 3566 } 3567 #endif 3568