vfs_subr.c revision 1.99
1/* $OpenBSD: vfs_subr.c,v 1.99 2004/05/27 08:25:53 tedu Exp $ */ 2/* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */ 3 4/* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 38 */ 39 40/* 41 * External virtual filesystem routines 42 */ 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/proc.h> 47#include <sys/mount.h> 48#include <sys/time.h> 49#include <sys/fcntl.h> 50#include <sys/kernel.h> 51#include <sys/vnode.h> 52#include <sys/stat.h> 53#include <sys/namei.h> 54#include <sys/ucred.h> 55#include <sys/buf.h> 56#include <sys/errno.h> 57#include <sys/malloc.h> 58#include <sys/domain.h> 59#include <sys/mbuf.h> 60#include <sys/syscallargs.h> 61#include <sys/pool.h> 62 63#include <uvm/uvm_extern.h> 64#include <sys/sysctl.h> 65 66#include <miscfs/specfs/specdev.h> 67 68enum vtype iftovt_tab[16] = { 69 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 70 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 71}; 72int vttoif_tab[9] = { 73 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 74 S_IFSOCK, S_IFIFO, S_IFMT, 75}; 76 77int doforce = 1; /* 1 => permit forcible unmounting */ 78int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 79int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */ 80 81/* 82 * Insq/Remq for the vnode usage lists. 83 */ 84#define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 85#define bufremvn(bp) { \ 86 LIST_REMOVE(bp, b_vnbufs); \ 87 (bp)->b_vnbufs.le_next = NOLIST; \ 88} 89 90struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 91struct freelst vnode_free_list; /* vnode free list */ 92 93struct mntlist mountlist; /* mounted filesystem list */ 94struct simplelock mountlist_slock; 95static struct simplelock mntid_slock; 96struct simplelock mntvnode_slock; 97struct simplelock vnode_free_list_slock; 98struct simplelock spechash_slock; 99 100void vclean(struct vnode *, int, struct proc *); 101 102void insmntque(struct vnode *, struct mount *); 103int getdevvp(dev_t, struct vnode **, enum vtype); 104 105int vfs_hang_addrlist(struct mount *, struct netexport *, 106 struct export_args *); 107int vfs_free_netcred(struct radix_node *, void *); 108void vfs_free_addrlist(struct netexport *); 109static __inline__ void vputonfreelist(struct vnode *); 110 111int vflush_vnode(struct vnode *, void *); 112 113#ifdef DEBUG 114void printlockedvnodes(void); 115#endif 116 117#define VN_KNOTE(vp, b) \ 118 KNOTE((struct klist *)&vp->v_selectinfo.vsi_selinfo.si_note, (b)) 119 120struct pool vnode_pool; 121 122/* 123 * Initialize the vnode management data structures. 124 */ 125void 126vntblinit() 127{ 128 129 pool_init(&vnode_pool, sizeof(struct vnode), 0, 0, 0, "vnodes", 130 &pool_allocator_nointr); 131 simple_lock_init(&mntvnode_slock); 132 simple_lock_init(&mntid_slock); 133 simple_lock_init(&spechash_slock); 134 TAILQ_INIT(&vnode_hold_list); 135 TAILQ_INIT(&vnode_free_list); 136 simple_lock_init(&vnode_free_list_slock); 137 CIRCLEQ_INIT(&mountlist); 138 simple_lock_init(&mountlist_slock); 139 /* 140 * Initialize the filesystem syncer. 141 */ 142 vn_initialize_syncerd(); 143} 144 145/* 146 * Mark a mount point as busy. Used to synchronize access and to delay 147 * unmounting. Interlock is not released on failure. 148 * 149 * historical behavior: 150 * - LK_NOWAIT means that we should just ignore the mount point if it's 151 * being unmounted. 152 * - no flags means that we should sleep on the mountpoint and then 153 * fail. 154 */ 155 156int 157vfs_busy(struct mount *mp, int flags, struct simplelock *interlkp, 158 struct proc *p) 159{ 160 int lkflags; 161 162 switch (flags) { 163 case LK_NOWAIT: 164 lkflags = LK_SHARED|LK_NOWAIT; 165 break; 166 case 0: 167 lkflags = LK_SHARED; 168 break; 169 default: 170 lkflags = flags; 171 } 172 173 /* 174 * Always sleepfail. We will only sleep for an exclusive lock 175 * and the exclusive lock will only be acquired when unmounting. 176 */ 177 lkflags |= LK_SLEEPFAIL; 178 179 if (interlkp) 180 lkflags |= LK_INTERLOCK; 181 if (lockmgr(&mp->mnt_lock, lkflags, interlkp, p)) 182 return (ENOENT); 183 return (0); 184} 185 186 187/* 188 * Free a busy file system 189 */ 190void 191vfs_unbusy(struct mount *mp, struct proc *p) 192{ 193 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, p); 194} 195 196int 197vfs_isbusy(struct mount *mp) 198{ 199 return (lockstatus(&mp->mnt_lock)); 200} 201 202/* 203 * Lookup a filesystem type, and if found allocate and initialize 204 * a mount structure for it. 205 * 206 * Devname is usually updated by mount(8) after booting. 207 */ 208 209int 210vfs_rootmountalloc(fstypename, devname, mpp) 211 char *fstypename; 212 char *devname; 213 struct mount **mpp; 214{ 215 struct proc *p = curproc; /* XXX */ 216 struct vfsconf *vfsp; 217 struct mount *mp; 218 219 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 220 if (!strcmp(vfsp->vfc_name, fstypename)) 221 break; 222 if (vfsp == NULL) 223 return (ENODEV); 224 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 225 bzero((char *)mp, (u_long)sizeof(struct mount)); 226 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 227 (void)vfs_busy(mp, LK_NOWAIT, 0, p); 228 LIST_INIT(&mp->mnt_vnodelist); 229 mp->mnt_vfc = vfsp; 230 mp->mnt_op = vfsp->vfc_vfsops; 231 mp->mnt_flag = MNT_RDONLY; 232 mp->mnt_vnodecovered = NULLVP; 233 vfsp->vfc_refcount++; 234 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 235 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 236 mp->mnt_stat.f_mntonname[0] = '/'; 237 (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); 238 *mpp = mp; 239 return (0); 240 } 241 242/* 243 * Find an appropriate filesystem to use for the root. If a filesystem 244 * has not been preselected, walk through the list of known filesystems 245 * trying those that have mountroot routines, and try them until one 246 * works or we have tried them all. 247 */ 248int 249vfs_mountroot() 250{ 251 struct vfsconf *vfsp; 252 int error; 253 254 if (mountroot != NULL) 255 return ((*mountroot)()); 256 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 257 if (vfsp->vfc_mountroot == NULL) 258 continue; 259 if ((error = (*vfsp->vfc_mountroot)()) == 0) 260 return (0); 261 printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error); 262 } 263 return (ENODEV); 264} 265 266/* 267 * Lookup a mount point by filesystem identifier. 268 */ 269struct mount * 270vfs_getvfs(fsid) 271 fsid_t *fsid; 272{ 273 register struct mount *mp; 274 275 simple_lock(&mountlist_slock); 276 CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) { 277 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 278 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 279 simple_unlock(&mountlist_slock); 280 return (mp); 281 } 282 } 283 simple_unlock(&mountlist_slock); 284 return ((struct mount *)0); 285} 286 287 288/* 289 * Get a new unique fsid 290 */ 291void 292vfs_getnewfsid(mp) 293 struct mount *mp; 294{ 295 static u_short xxxfs_mntid; 296 297 fsid_t tfsid; 298 int mtype; 299 300 simple_lock(&mntid_slock); 301 mtype = mp->mnt_vfc->vfc_typenum; 302 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 303 mp->mnt_stat.f_fsid.val[1] = mtype; 304 if (xxxfs_mntid == 0) 305 ++xxxfs_mntid; 306 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 307 tfsid.val[1] = mtype; 308 if (!CIRCLEQ_EMPTY(&mountlist)) { 309 while (vfs_getvfs(&tfsid)) { 310 tfsid.val[0]++; 311 xxxfs_mntid++; 312 } 313 } 314 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 315 simple_unlock(&mntid_slock); 316} 317 318/* 319 * Make a 'unique' number from a mount type name. 320 * Note that this is no longer used for ffs which 321 * now has an on-disk filesystem id. 322 */ 323long 324makefstype(type) 325 char *type; 326{ 327 long rv; 328 329 for (rv = 0; *type; type++) { 330 rv <<= 2; 331 rv ^= *type; 332 } 333 return rv; 334} 335 336/* 337 * Set vnode attributes to VNOVAL 338 */ 339void 340vattr_null(vap) 341 register struct vattr *vap; 342{ 343 344 vap->va_type = VNON; 345 /* XXX These next two used to be one line, but for a GCC bug. */ 346 vap->va_size = VNOVAL; 347 vap->va_bytes = VNOVAL; 348 vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = 349 vap->va_fsid = vap->va_fileid = 350 vap->va_blocksize = vap->va_rdev = 351 vap->va_atime.tv_sec = vap->va_atime.tv_nsec = 352 vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec = 353 vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec = 354 vap->va_flags = vap->va_gen = VNOVAL; 355 vap->va_vaflags = 0; 356} 357 358/* 359 * Routines having to do with the management of the vnode table. 360 */ 361extern int (**dead_vnodeop_p)(void *); 362long numvnodes; 363 364/* 365 * Return the next vnode from the free list. 366 */ 367int 368getnewvnode(tag, mp, vops, vpp) 369 enum vtagtype tag; 370 struct mount *mp; 371 int (**vops)(void *); 372 struct vnode **vpp; 373{ 374 struct proc *p = curproc; /* XXX */ 375 struct freelst *listhd; 376 static int toggle; 377 struct vnode *vp; 378 int s; 379 380 /* 381 * We must choose whether to allocate a new vnode or recycle an 382 * existing one. The criterion for allocating a new one is that 383 * the total number of vnodes is less than the number desired or 384 * there are no vnodes on either free list. Generally we only 385 * want to recycle vnodes that have no buffers associated with 386 * them, so we look first on the vnode_free_list. If it is empty, 387 * we next consider vnodes with referencing buffers on the 388 * vnode_hold_list. The toggle ensures that half the time we 389 * will use a buffer from the vnode_hold_list, and half the time 390 * we will allocate a new one unless the list has grown to twice 391 * the desired size. We are reticent to recycle vnodes from the 392 * vnode_hold_list because we will lose the identity of all its 393 * referencing buffers. 394 */ 395 toggle ^= 1; 396 if (numvnodes > 2 * desiredvnodes) 397 toggle = 0; 398 399 simple_lock(&vnode_free_list_slock); 400 s = splbio(); 401 if ((numvnodes < desiredvnodes) || 402 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 403 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 404 splx(s); 405 simple_unlock(&vnode_free_list_slock); 406 vp = pool_get(&vnode_pool, PR_WAITOK); 407 bzero((char *)vp, sizeof *vp); 408 simple_lock_init(&vp->v_interlock); 409 numvnodes++; 410 } else { 411 for (vp = TAILQ_FIRST(listhd); vp != NULLVP; 412 vp = TAILQ_NEXT(vp, v_freelist)) { 413 if (simple_lock_try(&vp->v_interlock)) { 414 if ((vp->v_flag & VLAYER) == 0) 415 break; 416 if (VOP_ISLOCKED(vp) == 0) 417 break; 418 else 419 simple_unlock(&vp->v_interlock); 420 } 421 } 422 /* 423 * Unless this is a bad time of the month, at most 424 * the first NCPUS items on the free list are 425 * locked, so this is close enough to being empty. 426 */ 427 if (vp == NULL) { 428 splx(s); 429 simple_unlock(&vnode_free_list_slock); 430 tablefull("vnode"); 431 *vpp = 0; 432 return (ENFILE); 433 } 434 if (vp->v_usecount) { 435 vprint("free vnode", vp); 436 panic("free vnode isn't"); 437 } 438 439 TAILQ_REMOVE(listhd, vp, v_freelist); 440 vp->v_bioflag &= ~VBIOONFREELIST; 441 splx(s); 442 443 simple_unlock(&vnode_free_list_slock); 444 if (vp->v_type != VBAD) 445 vgonel(vp, p); 446 else 447 simple_unlock(&vp->v_interlock); 448#ifdef DIAGNOSTIC 449 if (vp->v_data) { 450 vprint("cleaned vnode", vp); 451 panic("cleaned vnode isn't"); 452 } 453 s = splbio(); 454 if (vp->v_numoutput) 455 panic("Clean vnode has pending I/O's"); 456 splx(s); 457#endif 458 vp->v_flag = 0; 459 vp->v_socket = 0; 460 } 461 vp->v_type = VNON; 462 cache_purge(vp); 463 vp->v_vnlock = NULL; 464 lockinit(&vp->v_lock, PVFS, "v_lock", 0, 0); 465 vp->v_tag = tag; 466 vp->v_op = vops; 467 insmntque(vp, mp); 468 *vpp = vp; 469 vp->v_usecount = 1; 470 vp->v_data = 0; 471 simple_lock_init(&vp->v_uvm.u_obj.vmobjlock); 472 return (0); 473} 474 475/* 476 * Move a vnode from one mount queue to another. 477 */ 478void 479insmntque(vp, mp) 480 register struct vnode *vp; 481 register struct mount *mp; 482{ 483 simple_lock(&mntvnode_slock); 484 /* 485 * Delete from old mount point vnode list, if on one. 486 */ 487 488 if (vp->v_mount != NULL) 489 LIST_REMOVE(vp, v_mntvnodes); 490 /* 491 * Insert into list of vnodes for the new mount point, if available. 492 */ 493 if ((vp->v_mount = mp) != NULL) 494 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 495 simple_unlock(&mntvnode_slock); 496} 497 498 499/* 500 * Create a vnode for a block device. 501 * Used for root filesystem, argdev, and swap areas. 502 * Also used for memory file system special devices. 503 */ 504int 505bdevvp(dev, vpp) 506 dev_t dev; 507 struct vnode **vpp; 508{ 509 510 return (getdevvp(dev, vpp, VBLK)); 511} 512 513/* 514 * Create a vnode for a character device. 515 * Used for kernfs and some console handling. 516 */ 517int 518cdevvp(dev, vpp) 519 dev_t dev; 520 struct vnode **vpp; 521{ 522 523 return (getdevvp(dev, vpp, VCHR)); 524} 525 526/* 527 * Create a vnode for a device. 528 * Used by bdevvp (block device) for root file system etc., 529 * and by cdevvp (character device) for console and kernfs. 530 */ 531int 532getdevvp(dev, vpp, type) 533 dev_t dev; 534 struct vnode **vpp; 535 enum vtype type; 536{ 537 register struct vnode *vp; 538 struct vnode *nvp; 539 int error; 540 541 if (dev == NODEV) { 542 *vpp = NULLVP; 543 return (0); 544 } 545 error = getnewvnode(VT_NON, NULL, spec_vnodeop_p, &nvp); 546 if (error) { 547 *vpp = NULLVP; 548 return (error); 549 } 550 vp = nvp; 551 vp->v_type = type; 552 if ((nvp = checkalias(vp, dev, NULL)) != 0) { 553 vput(vp); 554 vp = nvp; 555 } 556 *vpp = vp; 557 return (0); 558} 559 560/* 561 * Check to see if the new vnode represents a special device 562 * for which we already have a vnode (either because of 563 * bdevvp() or because of a different vnode representing 564 * the same block device). If such an alias exists, deallocate 565 * the existing contents and return the aliased vnode. The 566 * caller is responsible for filling it with its new contents. 567 */ 568struct vnode * 569checkalias(nvp, nvp_rdev, mp) 570 register struct vnode *nvp; 571 dev_t nvp_rdev; 572 struct mount *mp; 573{ 574 struct proc *p = curproc; 575 register struct vnode *vp; 576 struct vnode **vpp; 577 578 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 579 return (NULLVP); 580 581 vpp = &speclisth[SPECHASH(nvp_rdev)]; 582loop: 583 simple_lock(&spechash_slock); 584 for (vp = *vpp; vp; vp = vp->v_specnext) { 585 simple_lock(&vp->v_interlock); 586 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 587 simple_unlock(&vp->v_interlock); 588 continue; 589 } 590 /* 591 * Alias, but not in use, so flush it out. 592 */ 593 if (vp->v_usecount == 0) { 594 simple_unlock(&spechash_slock); 595 vgonel(vp, p); 596 goto loop; 597 } 598 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) { 599 simple_unlock(&spechash_slock); 600 goto loop; 601 } 602 break; 603 } 604 605 /* 606 * Common case is actually in the if statement 607 */ 608 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 609 MALLOC(nvp->v_specinfo, struct specinfo *, 610 sizeof(struct specinfo), M_VNODE, M_WAITOK); 611 nvp->v_rdev = nvp_rdev; 612 nvp->v_hashchain = vpp; 613 nvp->v_specnext = *vpp; 614 nvp->v_specmountpoint = NULL; 615 nvp->v_speclockf = NULL; 616 simple_unlock(&spechash_slock); 617 *vpp = nvp; 618 if (vp != NULLVP) { 619 nvp->v_flag |= VALIASED; 620 vp->v_flag |= VALIASED; 621 vput(vp); 622 } 623 return (NULLVP); 624 } 625 626 /* 627 * This code is the uncommon case. It is called in case 628 * we found an alias that was VT_NON && vtype of VBLK 629 * This means we found a block device that was created 630 * using bdevvp. 631 * An example of such a vnode is the root partition device vnode 632 * created in ffs_mountroot. 633 * 634 * The vnodes created by bdevvp should not be aliased (why?). 635 */ 636 637 simple_unlock(&spechash_slock); 638 VOP_UNLOCK(vp, 0, p); 639 simple_lock(&vp->v_interlock); 640 vclean(vp, 0, p); 641 vp->v_vnlock = NULL; 642 lockinit(&vp->v_lock, PVFS, "v_lock", 0, 0); 643 vp->v_op = nvp->v_op; 644 vp->v_tag = nvp->v_tag; 645 nvp->v_type = VNON; 646 insmntque(vp, mp); 647 return (vp); 648} 649 650/* 651 * Grab a particular vnode from the free list, increment its 652 * reference count and lock it. The vnode lock bit is set the 653 * vnode is being eliminated in vgone. The process is awakened 654 * when the transition is completed, and an error returned to 655 * indicate that the vnode is no longer usable (possibly having 656 * been changed to a new file system type). 657 */ 658int 659vget(vp, flags, p) 660 struct vnode *vp; 661 int flags; 662 struct proc *p; 663{ 664 int error; 665 int s; 666 /* 667 * If the vnode is in the process of being cleaned out for 668 * another use, we wait for the cleaning to finish and then 669 * return failure. Cleaning is determined by checking that 670 * the VXLOCK flag is set. 671 */ 672 if ((flags & LK_INTERLOCK) == 0) { 673 simple_lock(&vp->v_interlock); 674 flags |= LK_INTERLOCK; 675 } 676 if (vp->v_flag & VXLOCK) { 677 vp->v_flag |= VXWANT; 678 simple_unlock(&vp->v_interlock); 679 tsleep(vp, PINOD, "vget", 0); 680 return (ENOENT); 681 } 682 if (vp->v_usecount == 0 && 683 (vp->v_bioflag & VBIOONFREELIST)) { 684 s = splbio(); 685 simple_lock(&vnode_free_list_slock); 686 if (vp->v_holdcnt > 0) 687 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 688 else 689 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 690 simple_unlock(&vnode_free_list_slock); 691 vp->v_bioflag &= ~VBIOONFREELIST; 692 splx(s); 693 } 694 vp->v_usecount++; 695 if (flags & LK_TYPE_MASK) { 696 if ((error = vn_lock(vp, flags, p)) != 0) { 697 vp->v_usecount--; 698 if (vp->v_usecount == 0) 699 vputonfreelist(vp); 700 701 simple_unlock(&vp->v_interlock); 702 } 703 return (error); 704 } 705 simple_unlock(&vp->v_interlock); 706 return (0); 707} 708 709 710#ifdef DIAGNOSTIC 711/* 712 * Vnode reference. 713 */ 714void 715vref(vp) 716 struct vnode *vp; 717{ 718 simple_lock(&vp->v_interlock); 719 if (vp->v_usecount == 0) 720 panic("vref used where vget required"); 721 vp->v_usecount++; 722 simple_unlock(&vp->v_interlock); 723} 724#endif /* DIAGNOSTIC */ 725 726static __inline__ void 727vputonfreelist(vp) 728 struct vnode *vp; 729{ 730 int s; 731 struct freelst *lst; 732 733 s = splbio(); 734#ifdef DIAGNOSTIC 735 if (vp->v_usecount != 0) 736 panic("Use count is not zero!"); 737 738 if (vp->v_bioflag & VBIOONFREELIST) { 739 vprint("vnode already on free list: ", vp); 740 panic("vnode already on free list"); 741 } 742#endif 743 744 vp->v_bioflag |= VBIOONFREELIST; 745 746 if (vp->v_holdcnt > 0) 747 lst = &vnode_hold_list; 748 else 749 lst = &vnode_free_list; 750 751 if (vp->v_type == VBAD) 752 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 753 else 754 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 755 756 splx(s); 757} 758 759/* 760 * vput(), just unlock and vrele() 761 */ 762void 763vput(vp) 764 register struct vnode *vp; 765{ 766 struct proc *p = curproc; /* XXX */ 767 768#ifdef DIAGNOSTIC 769 if (vp == NULL) 770 panic("vput: null vp"); 771#endif 772 simple_lock(&vp->v_interlock); 773 774#ifdef DIAGNOSTIC 775 if (vp->v_usecount == 0) { 776 vprint("vput: bad ref count", vp); 777 panic("vput: ref cnt"); 778 } 779#endif 780 vp->v_usecount--; 781 if (vp->v_usecount > 0) { 782 simple_unlock(&vp->v_interlock); 783 VOP_UNLOCK(vp, 0, p); 784 return; 785 } 786 787#ifdef DIAGNOSTIC 788 if (vp->v_writecount != 0) { 789 vprint("vput: bad writecount", vp); 790 panic("vput: v_writecount != 0"); 791 } 792#endif 793 vputonfreelist(vp); 794 795 simple_unlock(&vp->v_interlock); 796 797 VOP_INACTIVE(vp, p); 798} 799 800/* 801 * Vnode release - use for active VNODES. 802 * If count drops to zero, call inactive routine and return to freelist. 803 */ 804void 805vrele(vp) 806 register struct vnode *vp; 807{ 808 struct proc *p = curproc; /* XXX */ 809 810#ifdef DIAGNOSTIC 811 if (vp == NULL) 812 panic("vrele: null vp"); 813#endif 814 simple_lock(&vp->v_interlock); 815#ifdef DIAGNOSTIC 816 if (vp->v_usecount == 0) { 817 vprint("vrele: bad ref count", vp); 818 panic("vrele: ref cnt"); 819 } 820#endif 821 vp->v_usecount--; 822 if (vp->v_usecount > 0) { 823 simple_unlock(&vp->v_interlock); 824 return; 825 } 826 827#ifdef DIAGNOSTIC 828 if (vp->v_writecount != 0) { 829 vprint("vrele: bad writecount", vp); 830 panic("vrele: v_writecount != 0"); 831 } 832#endif 833 vputonfreelist(vp); 834 835 if (vn_lock(vp, LK_EXCLUSIVE|LK_INTERLOCK, p) == 0) 836 VOP_INACTIVE(vp, p); 837} 838 839void vhold(struct vnode *vp); 840 841/* 842 * Page or buffer structure gets a reference. 843 */ 844void 845vhold(vp) 846 register struct vnode *vp; 847{ 848 849 /* 850 * If it is on the freelist and the hold count is currently 851 * zero, move it to the hold list. 852 */ 853 simple_lock(&vp->v_interlock); 854 if ((vp->v_bioflag & VBIOONFREELIST) && 855 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 856 simple_lock(&vnode_free_list_slock); 857 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 858 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 859 simple_unlock(&vnode_free_list_slock); 860 } 861 vp->v_holdcnt++; 862 simple_unlock(&vp->v_interlock); 863} 864 865/* 866 * Remove any vnodes in the vnode table belonging to mount point mp. 867 * 868 * If MNT_NOFORCE is specified, there should not be any active ones, 869 * return error if any are found (nb: this is a user error, not a 870 * system error). If MNT_FORCE is specified, detach any active vnodes 871 * that are found. 872 */ 873#ifdef DEBUG 874int busyprt = 0; /* print out busy vnodes */ 875struct ctldebug debug1 = { "busyprt", &busyprt }; 876#endif 877 878int 879vfs_mount_foreach_vnode(struct mount *mp, 880 int (*func)(struct vnode *, void *), void *arg) { 881 struct vnode *vp, *nvp; 882 int error = 0; 883 884 simple_lock(&mntvnode_slock); 885loop: 886 for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { 887 if (vp->v_mount != mp) 888 goto loop; 889 nvp = vp->v_mntvnodes.le_next; 890 simple_lock(&vp->v_interlock); 891 simple_unlock(&mntvnode_slock); 892 893 error = func(vp, arg); 894 895 simple_lock(&mntvnode_slock); 896 897 if (error != 0) 898 break; 899 } 900 simple_unlock(&mntvnode_slock); 901 902 return (error); 903} 904 905 906struct vflush_args { 907 struct vnode *skipvp; 908 int busy; 909 int flags; 910}; 911 912int 913vflush_vnode(struct vnode *vp, void *arg) { 914 struct vflush_args *va = arg; 915 struct proc *p = curproc; 916 917 if (vp == va->skipvp) { 918 simple_unlock(&vp->v_interlock); 919 return (0); 920 } 921 922 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 923 simple_unlock(&vp->v_interlock); 924 return (0); 925 } 926 927 /* 928 * If WRITECLOSE is set, only flush out regular file 929 * vnodes open for writing. 930 */ 931 if ((va->flags & WRITECLOSE) && 932 (vp->v_writecount == 0 || vp->v_type != VREG)) { 933 simple_unlock(&vp->v_interlock); 934 return (0); 935 } 936 937 /* 938 * With v_usecount == 0, all we need to do is clear 939 * out the vnode data structures and we are done. 940 */ 941 if (vp->v_usecount == 0) { 942 vgonel(vp, p); 943 return (0); 944 } 945 946 /* 947 * If FORCECLOSE is set, forcibly close the vnode. 948 * For block or character devices, revert to an 949 * anonymous device. For all other files, just kill them. 950 */ 951 if (va->flags & FORCECLOSE) { 952 if (vp->v_type != VBLK && vp->v_type != VCHR) { 953 vgonel(vp, p); 954 } else { 955 vclean(vp, 0, p); 956 vp->v_op = spec_vnodeop_p; 957 insmntque(vp, (struct mount *)0); 958 } 959 return (0); 960 } 961 962#ifdef DEBUG 963 if (busyprt) 964 vprint("vflush: busy vnode", vp); 965#endif 966 simple_unlock(&vp->v_interlock); 967 va->busy++; 968 return (0); 969} 970 971int 972vflush(mp, skipvp, flags) 973 struct mount *mp; 974 struct vnode *skipvp; 975 int flags; 976{ 977 struct vflush_args va; 978 va.skipvp = skipvp; 979 va.busy = 0; 980 va.flags = flags; 981 982 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 983 984 if (va.busy) 985 return (EBUSY); 986 return (0); 987} 988 989/* 990 * Disassociate the underlying file system from a vnode. 991 * The vnode interlock is held on entry. 992 */ 993void 994vclean(vp, flags, p) 995 register struct vnode *vp; 996 int flags; 997 struct proc *p; 998{ 999 int active; 1000 1001 /* 1002 * Check to see if the vnode is in use. 1003 * If so we have to reference it before we clean it out 1004 * so that its count cannot fall to zero and generate a 1005 * race against ourselves to recycle it. 1006 */ 1007 if ((active = vp->v_usecount) != 0) 1008 vp->v_usecount++; 1009 1010 /* 1011 * Prevent the vnode from being recycled or 1012 * brought into use while we clean it out. 1013 */ 1014 if (vp->v_flag & VXLOCK) 1015 panic("vclean: deadlock"); 1016 vp->v_flag |= VXLOCK; 1017 /* 1018 * Even if the count is zero, the VOP_INACTIVE routine may still 1019 * have the object locked while it cleans it out. The VOP_LOCK 1020 * ensures that the VOP_INACTIVE routine is done with its work. 1021 * For active vnodes, it ensures that no other activity can 1022 * occur while the underlying object is being cleaned out. 1023 */ 1024 VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, p); 1025 1026 /* 1027 * clean out any VM data associated with the vnode. 1028 */ 1029 uvm_vnp_terminate(vp); 1030 /* 1031 * Clean out any buffers associated with the vnode. 1032 */ 1033 if (flags & DOCLOSE) 1034 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 1035 /* 1036 * If purging an active vnode, it must be closed and 1037 * deactivated before being reclaimed. Note that the 1038 * VOP_INACTIVE will unlock the vnode 1039 */ 1040 if (active) { 1041 if (flags & DOCLOSE) 1042 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1043 VOP_INACTIVE(vp, p); 1044 } else { 1045 /* 1046 * Any other processes trying to obtain this lock must first 1047 * wait for VXLOCK to clear, then call the new lock operation. 1048 */ 1049 VOP_UNLOCK(vp, 0, p); 1050 } 1051 1052 /* 1053 * Reclaim the vnode. 1054 */ 1055 if (VOP_RECLAIM(vp, p)) 1056 panic("vclean: cannot reclaim"); 1057 if (active) { 1058 simple_lock(&vp->v_interlock); 1059 1060 vp->v_usecount--; 1061 if (vp->v_usecount == 0) { 1062 if (vp->v_holdcnt > 0) 1063 panic("vclean: not clean"); 1064 vputonfreelist(vp); 1065 } 1066 1067 simple_unlock(&vp->v_interlock); 1068 } 1069 cache_purge(vp); 1070 1071 /* 1072 * Done with purge, notify sleepers of the grim news. 1073 */ 1074 vp->v_op = dead_vnodeop_p; 1075 simple_lock(&vp->v_selectinfo.vsi_lock); 1076 VN_KNOTE(vp, NOTE_REVOKE); 1077 simple_unlock(&vp->v_selectinfo.vsi_lock); 1078 vp->v_tag = VT_NON; 1079 vp->v_flag &= ~VXLOCK; 1080#ifdef DIAGNOSTIC 1081 vp->v_flag &= ~VLOCKSWORK; 1082#endif 1083 if (vp->v_flag & VXWANT) { 1084 vp->v_flag &= ~VXWANT; 1085 wakeup(vp); 1086 } 1087} 1088 1089 1090 1091/* 1092 * Recycle an unused vnode to the front of the free list. 1093 * Release the passed interlock if the vnode will be recycled. 1094 */ 1095int 1096vrecycle(vp, inter_lkp, p) 1097 struct vnode *vp; 1098 struct simplelock *inter_lkp; 1099 struct proc *p; 1100{ 1101 1102 simple_lock(&vp->v_interlock); 1103 if (vp->v_usecount == 0) { 1104 if (inter_lkp) 1105 simple_unlock(inter_lkp); 1106 vgonel(vp, p); 1107 return (1); 1108 } 1109 simple_unlock(&vp->v_interlock); 1110 return (0); 1111} 1112 1113 1114/* 1115 * Eliminate all activity associated with a vnode 1116 * in preparation for reuse. 1117 */ 1118void 1119vgone(vp) 1120 register struct vnode *vp; 1121{ 1122 struct proc *p = curproc; 1123 1124 simple_lock (&vp->v_interlock); 1125 vgonel(vp, p); 1126} 1127 1128/* 1129 * vgone, with the vp interlock held. 1130 */ 1131void 1132vgonel(vp, p) 1133 struct vnode *vp; 1134 struct proc *p; 1135{ 1136 register struct vnode *vq; 1137 struct vnode *vx; 1138 1139 /* 1140 * If a vgone (or vclean) is already in progress, 1141 * wait until it is done and return. 1142 */ 1143 if (vp->v_flag & VXLOCK) { 1144 vp->v_flag |= VXWANT; 1145 simple_unlock(&vp->v_interlock); 1146 tsleep(vp, PINOD, "vgone", 0); 1147 return; 1148 } 1149 /* 1150 * Clean out the filesystem specific data. 1151 */ 1152 vclean(vp, DOCLOSE, p); 1153 /* 1154 * Delete from old mount point vnode list, if on one. 1155 */ 1156 if (vp->v_mount != NULL) 1157 insmntque(vp, (struct mount *)0); 1158 /* 1159 * If special device, remove it from special device alias list 1160 * if it is on one. 1161 */ 1162 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1163 simple_lock(&spechash_slock); 1164 if (*vp->v_hashchain == vp) { 1165 *vp->v_hashchain = vp->v_specnext; 1166 } else { 1167 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1168 if (vq->v_specnext != vp) 1169 continue; 1170 vq->v_specnext = vp->v_specnext; 1171 break; 1172 } 1173 if (vq == NULL) 1174 panic("missing bdev"); 1175 } 1176 if (vp->v_flag & VALIASED) { 1177 vx = NULL; 1178 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1179 if (vq->v_rdev != vp->v_rdev || 1180 vq->v_type != vp->v_type) 1181 continue; 1182 if (vx) 1183 break; 1184 vx = vq; 1185 } 1186 if (vx == NULL) 1187 panic("missing alias"); 1188 if (vq == NULL) 1189 vx->v_flag &= ~VALIASED; 1190 vp->v_flag &= ~VALIASED; 1191 } 1192 simple_unlock(&spechash_slock); 1193 FREE(vp->v_specinfo, M_VNODE); 1194 vp->v_specinfo = NULL; 1195 } 1196 /* 1197 * If it is on the freelist and not already at the head, 1198 * move it to the head of the list. 1199 */ 1200 vp->v_type = VBAD; 1201 1202 /* 1203 * Move onto the free list, unless we were called from 1204 * getnewvnode and we're not on any free list 1205 */ 1206 if (vp->v_usecount == 0 && 1207 (vp->v_bioflag & VBIOONFREELIST)) { 1208 int s; 1209 1210 simple_lock(&vnode_free_list_slock); 1211 s = splbio(); 1212 1213 if (vp->v_holdcnt > 0) 1214 panic("vgonel: not clean"); 1215 1216 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1217 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1218 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1219 } 1220 splx(s); 1221 simple_unlock(&vnode_free_list_slock); 1222 } 1223} 1224 1225/* 1226 * Lookup a vnode by device number. 1227 */ 1228int 1229vfinddev(dev, type, vpp) 1230 dev_t dev; 1231 enum vtype type; 1232 struct vnode **vpp; 1233{ 1234 register struct vnode *vp; 1235 int rc =0; 1236 1237 simple_lock(&spechash_slock); 1238 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1239 if (dev != vp->v_rdev || type != vp->v_type) 1240 continue; 1241 *vpp = vp; 1242 rc = 1; 1243 break; 1244 } 1245 simple_unlock(&spechash_slock); 1246 return (rc); 1247} 1248 1249/* 1250 * Revoke all the vnodes corresponding to the specified minor number 1251 * range (endpoints inclusive) of the specified major. 1252 */ 1253void 1254vdevgone(maj, minl, minh, type) 1255 int maj, minl, minh; 1256 enum vtype type; 1257{ 1258 struct vnode *vp; 1259 int mn; 1260 1261 for (mn = minl; mn <= minh; mn++) 1262 if (vfinddev(makedev(maj, mn), type, &vp)) 1263 VOP_REVOKE(vp, REVOKEALL); 1264} 1265 1266/* 1267 * Calculate the total number of references to a special device. 1268 */ 1269int 1270vcount(vp) 1271 struct vnode *vp; 1272{ 1273 struct vnode *vq, *vnext; 1274 int count; 1275 1276loop: 1277 if ((vp->v_flag & VALIASED) == 0) 1278 return (vp->v_usecount); 1279 simple_lock(&spechash_slock); 1280 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1281 vnext = vq->v_specnext; 1282 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1283 continue; 1284 /* 1285 * Alias, but not in use, so flush it out. 1286 */ 1287 if (vq->v_usecount == 0 && vq != vp) { 1288 simple_unlock(&spechash_slock); 1289 vgone(vq); 1290 goto loop; 1291 } 1292 count += vq->v_usecount; 1293 } 1294 simple_unlock(&spechash_slock); 1295 return (count); 1296} 1297 1298/* 1299 * Print out a description of a vnode. 1300 */ 1301static char *typename[] = 1302 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1303 1304void 1305vprint(label, vp) 1306 char *label; 1307 register struct vnode *vp; 1308{ 1309 char buf[64]; 1310 1311 if (label != NULL) 1312 printf("%s: ", label); 1313 printf("type %s, usecount %u, writecount %u, holdcount %u,", 1314 typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1315 vp->v_holdcnt); 1316 buf[0] = '\0'; 1317 if (vp->v_flag & VROOT) 1318 strlcat(buf, "|VROOT", sizeof buf); 1319 if (vp->v_flag & VTEXT) 1320 strlcat(buf, "|VTEXT", sizeof buf); 1321 if (vp->v_flag & VSYSTEM) 1322 strlcat(buf, "|VSYSTEM", sizeof buf); 1323 if (vp->v_flag & VXLOCK) 1324 strlcat(buf, "|VXLOCK", sizeof buf); 1325 if (vp->v_flag & VXWANT) 1326 strlcat(buf, "|VXWANT", sizeof buf); 1327 if (vp->v_bioflag & VBIOWAIT) 1328 strlcat(buf, "| VBIOWAIT", sizeof buf); 1329 if (vp->v_flag & VALIASED) 1330 strlcat(buf, "|VALIASED", sizeof buf); 1331 if (buf[0] != '\0') 1332 printf(" flags (%s)", &buf[1]); 1333 if (vp->v_data == NULL) { 1334 printf("\n"); 1335 } else { 1336 printf("\n\t"); 1337 VOP_PRINT(vp); 1338 } 1339} 1340 1341#ifdef DEBUG 1342/* 1343 * List all of the locked vnodes in the system. 1344 * Called when debugging the kernel. 1345 */ 1346void 1347printlockedvnodes() 1348{ 1349 struct proc *p = curproc; 1350 register struct mount *mp, *nmp; 1351 register struct vnode *vp; 1352 1353 printf("Locked vnodes\n"); 1354 simple_lock(&mountlist_slock); 1355 for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist); 1356 mp = nmp) { 1357 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 1358 nmp = CIRCLEQ_NEXT(mp, mnt_list); 1359 continue; 1360 } 1361 for (vp = mp->mnt_vnodelist.lh_first; vp; 1362 vp = vp->v_mntvnodes.le_next) { 1363 if (VOP_ISLOCKED(vp)) 1364 vprint((char *)0, vp); 1365 } 1366 simple_lock(&mountlist_slock); 1367 nmp = CIRCLEQ_NEXT(mp, mnt_list); 1368 vfs_unbusy(mp, p); 1369 } 1370 simple_unlock(&mountlist_slock); 1371 1372} 1373#endif 1374 1375/* 1376 * Top level filesystem related information gathering. 1377 */ 1378int 1379vfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1380 int *name; 1381 u_int namelen; 1382 void *oldp; 1383 size_t *oldlenp; 1384 void *newp; 1385 size_t newlen; 1386 struct proc *p; 1387{ 1388 struct vfsconf *vfsp; 1389 1390 /* all sysctl names at this level are at least name and field */ 1391 if (namelen < 2) 1392 return (ENOTDIR); /* overloaded */ 1393 if (name[0] != VFS_GENERIC) { 1394 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1395 if (vfsp->vfc_typenum == name[0]) 1396 break; 1397 if (vfsp == NULL) 1398 return (EOPNOTSUPP); 1399 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1400 oldp, oldlenp, newp, newlen, p)); 1401 } 1402 switch (name[1]) { 1403 case VFS_MAXTYPENUM: 1404 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1405 case VFS_CONF: 1406 if (namelen < 3) 1407 return (ENOTDIR); /* overloaded */ 1408 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1409 if (vfsp->vfc_typenum == name[2]) 1410 break; 1411 if (vfsp == NULL) 1412 return (EOPNOTSUPP); 1413 return (sysctl_rdstruct(oldp, oldlenp, newp, vfsp, 1414 sizeof(struct vfsconf))); 1415 } 1416 return (EOPNOTSUPP); 1417} 1418 1419 1420int kinfo_vdebug = 1; 1421int kinfo_vgetfailed; 1422#define KINFO_VNODESLOP 10 1423/* 1424 * Dump vnode list (via sysctl). 1425 * Copyout address of vnode followed by vnode. 1426 */ 1427/* ARGSUSED */ 1428int 1429sysctl_vnode(where, sizep, p) 1430 char *where; 1431 size_t *sizep; 1432 struct proc *p; 1433{ 1434 register struct mount *mp, *nmp; 1435 struct vnode *vp, *nvp; 1436 register char *bp = where, *savebp; 1437 char *ewhere; 1438 int error; 1439 1440 if (where == NULL) { 1441 *sizep = (numvnodes + KINFO_VNODESLOP) * sizeof(struct e_vnode); 1442 return (0); 1443 } 1444 ewhere = where + *sizep; 1445 1446 simple_lock(&mountlist_slock); 1447 for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist); 1448 mp = nmp) { 1449 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 1450 nmp = CIRCLEQ_NEXT(mp, mnt_list); 1451 continue; 1452 } 1453 savebp = bp; 1454again: 1455 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; 1456 vp = nvp) { 1457 /* 1458 * Check that the vp is still associated with 1459 * this filesystem. RACE: could have been 1460 * recycled onto the same filesystem. 1461 */ 1462 if (vp->v_mount != mp) { 1463 simple_unlock(&mntvnode_slock); 1464 if (kinfo_vdebug) 1465 printf("kinfo: vp changed\n"); 1466 bp = savebp; 1467 goto again; 1468 } 1469 nvp = vp->v_mntvnodes.le_next; 1470 if (bp + sizeof(struct e_vnode) > ewhere) { 1471 simple_unlock(&mntvnode_slock); 1472 *sizep = bp - where; 1473 vfs_unbusy(mp, p); 1474 return (ENOMEM); 1475 } 1476 if ((error = copyout(&vp, 1477 &((struct e_vnode *)bp)->vptr, 1478 sizeof(struct vnode *))) || 1479 (error = copyout(vp, 1480 &((struct e_vnode *)bp)->vnode, 1481 sizeof(struct vnode)))) { 1482 vfs_unbusy(mp, p); 1483 return (error); 1484 } 1485 bp += sizeof(struct e_vnode); 1486 simple_lock(&mntvnode_slock); 1487 } 1488 1489 simple_unlock(&mntvnode_slock); 1490 simple_lock(&mountlist_slock); 1491 nmp = CIRCLEQ_NEXT(mp, mnt_list); 1492 vfs_unbusy(mp, p); 1493 } 1494 1495 simple_unlock(&mountlist_slock); 1496 1497 *sizep = bp - where; 1498 return (0); 1499} 1500 1501/* 1502 * Check to see if a filesystem is mounted on a block device. 1503 */ 1504int 1505vfs_mountedon(vp) 1506 register struct vnode *vp; 1507{ 1508 register struct vnode *vq; 1509 int error = 0; 1510 1511 if (vp->v_specmountpoint != NULL) 1512 return (EBUSY); 1513 if (vp->v_flag & VALIASED) { 1514 simple_lock(&spechash_slock); 1515 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1516 if (vq->v_rdev != vp->v_rdev || 1517 vq->v_type != vp->v_type) 1518 continue; 1519 if (vq->v_specmountpoint != NULL) { 1520 error = EBUSY; 1521 break; 1522 } 1523 } 1524 simple_unlock(&spechash_slock); 1525 } 1526 return (error); 1527} 1528 1529/* 1530 * Build hash lists of net addresses and hang them off the mount point. 1531 * Called by ufs_mount() to set up the lists of export addresses. 1532 */ 1533int 1534vfs_hang_addrlist(mp, nep, argp) 1535 struct mount *mp; 1536 struct netexport *nep; 1537 struct export_args *argp; 1538{ 1539 register struct netcred *np; 1540 register struct radix_node_head *rnh; 1541 register int i; 1542 struct radix_node *rn; 1543 struct sockaddr *saddr, *smask = 0; 1544 struct domain *dom; 1545 int error; 1546 1547 if (argp->ex_addrlen == 0) { 1548 if (mp->mnt_flag & MNT_DEFEXPORTED) 1549 return (EPERM); 1550 np = &nep->ne_defexported; 1551 np->netc_exflags = argp->ex_flags; 1552 np->netc_anon = argp->ex_anon; 1553 np->netc_anon.cr_ref = 1; 1554 mp->mnt_flag |= MNT_DEFEXPORTED; 1555 return (0); 1556 } 1557 if (argp->ex_addrlen > MLEN) 1558 return (EINVAL); 1559 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1560 np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK); 1561 bzero(np, i); 1562 saddr = (struct sockaddr *)(np + 1); 1563 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1564 if (error) 1565 goto out; 1566 if (saddr->sa_len > argp->ex_addrlen) 1567 saddr->sa_len = argp->ex_addrlen; 1568 if (argp->ex_masklen) { 1569 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1570 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1571 if (error) 1572 goto out; 1573 if (smask->sa_len > argp->ex_masklen) 1574 smask->sa_len = argp->ex_masklen; 1575 } 1576 i = saddr->sa_family; 1577 if (i < 0 || i > AF_MAX) { 1578 error = EINVAL; 1579 goto out; 1580 } 1581 if ((rnh = nep->ne_rtable[i]) == 0) { 1582 /* 1583 * Seems silly to initialize every AF when most are not 1584 * used, do so on demand here 1585 */ 1586 for (dom = domains; dom; dom = dom->dom_next) 1587 if (dom->dom_family == i && dom->dom_rtattach) { 1588 dom->dom_rtattach((void **)&nep->ne_rtable[i], 1589 dom->dom_rtoffset); 1590 break; 1591 } 1592 if ((rnh = nep->ne_rtable[i]) == 0) { 1593 error = ENOBUFS; 1594 goto out; 1595 } 1596 } 1597 rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh, 1598 np->netc_rnodes); 1599 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 1600 error = EPERM; 1601 goto out; 1602 } 1603 np->netc_exflags = argp->ex_flags; 1604 np->netc_anon = argp->ex_anon; 1605 np->netc_anon.cr_ref = 1; 1606 return (0); 1607out: 1608 free(np, M_NETADDR); 1609 return (error); 1610} 1611 1612/* ARGSUSED */ 1613int 1614vfs_free_netcred(rn, w) 1615 struct radix_node *rn; 1616 void *w; 1617{ 1618 register struct radix_node_head *rnh = (struct radix_node_head *)w; 1619 1620 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh, NULL); 1621 free(rn, M_NETADDR); 1622 return (0); 1623} 1624 1625/* 1626 * Free the net address hash lists that are hanging off the mount points. 1627 */ 1628void 1629vfs_free_addrlist(nep) 1630 struct netexport *nep; 1631{ 1632 register int i; 1633 register struct radix_node_head *rnh; 1634 1635 for (i = 0; i <= AF_MAX; i++) 1636 if ((rnh = nep->ne_rtable[i]) != NULL) { 1637 (*rnh->rnh_walktree)(rnh, vfs_free_netcred, rnh); 1638 free(rnh, M_RTABLE); 1639 nep->ne_rtable[i] = 0; 1640 } 1641} 1642 1643int 1644vfs_export(mp, nep, argp) 1645 struct mount *mp; 1646 struct netexport *nep; 1647 struct export_args *argp; 1648{ 1649 int error; 1650 1651 if (argp->ex_flags & MNT_DELEXPORT) { 1652 vfs_free_addrlist(nep); 1653 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1654 } 1655 if (argp->ex_flags & MNT_EXPORTED) { 1656 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1657 return (error); 1658 mp->mnt_flag |= MNT_EXPORTED; 1659 } 1660 return (0); 1661} 1662 1663struct netcred * 1664vfs_export_lookup(mp, nep, nam) 1665 register struct mount *mp; 1666 struct netexport *nep; 1667 struct mbuf *nam; 1668{ 1669 register struct netcred *np; 1670 register struct radix_node_head *rnh; 1671 struct sockaddr *saddr; 1672 1673 np = NULL; 1674 if (mp->mnt_flag & MNT_EXPORTED) { 1675 /* 1676 * Lookup in the export list first. 1677 */ 1678 if (nam != NULL) { 1679 saddr = mtod(nam, struct sockaddr *); 1680 rnh = nep->ne_rtable[saddr->sa_family]; 1681 if (rnh != NULL) { 1682 np = (struct netcred *) 1683 (*rnh->rnh_matchaddr)((caddr_t)saddr, 1684 rnh); 1685 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 1686 np = NULL; 1687 } 1688 } 1689 /* 1690 * If no address match, use the default if it exists. 1691 */ 1692 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1693 np = &nep->ne_defexported; 1694 } 1695 return (np); 1696} 1697 1698/* 1699 * Do the usual access checking. 1700 * file_mode, uid and gid are from the vnode in question, 1701 * while acc_mode and cred are from the VOP_ACCESS parameter list 1702 */ 1703int 1704vaccess(file_mode, uid, gid, acc_mode, cred) 1705 mode_t file_mode; 1706 uid_t uid; 1707 gid_t gid; 1708 mode_t acc_mode; 1709 struct ucred *cred; 1710{ 1711 mode_t mask; 1712 1713 /* User id 0 always gets access. */ 1714 if (cred->cr_uid == 0) 1715 return 0; 1716 1717 mask = 0; 1718 1719 /* Otherwise, check the owner. */ 1720 if (cred->cr_uid == uid) { 1721 if (acc_mode & VEXEC) 1722 mask |= S_IXUSR; 1723 if (acc_mode & VREAD) 1724 mask |= S_IRUSR; 1725 if (acc_mode & VWRITE) 1726 mask |= S_IWUSR; 1727 return (file_mode & mask) == mask ? 0 : EACCES; 1728 } 1729 1730 /* Otherwise, check the groups. */ 1731 if (cred->cr_gid == gid || groupmember(gid, cred)) { 1732 if (acc_mode & VEXEC) 1733 mask |= S_IXGRP; 1734 if (acc_mode & VREAD) 1735 mask |= S_IRGRP; 1736 if (acc_mode & VWRITE) 1737 mask |= S_IWGRP; 1738 return (file_mode & mask) == mask ? 0 : EACCES; 1739 } 1740 1741 /* Otherwise, check everyone else. */ 1742 if (acc_mode & VEXEC) 1743 mask |= S_IXOTH; 1744 if (acc_mode & VREAD) 1745 mask |= S_IROTH; 1746 if (acc_mode & VWRITE) 1747 mask |= S_IWOTH; 1748 return (file_mode & mask) == mask ? 0 : EACCES; 1749} 1750 1751/* 1752 * Unmount all file systems. 1753 * We traverse the list in reverse order under the assumption that doing so 1754 * will avoid needing to worry about dependencies. 1755 */ 1756void 1757vfs_unmountall(void) 1758{ 1759 struct mount *mp, *nmp; 1760 int allerror, error, again = 1; 1761 struct proc *p = curproc; 1762 1763 retry: 1764 allerror = 0; 1765 for (mp = CIRCLEQ_LAST(&mountlist); mp != CIRCLEQ_END(&mountlist); 1766 mp = nmp) { 1767 nmp = CIRCLEQ_PREV(mp, mnt_list); 1768 if ((vfs_busy(mp, LK_EXCLUSIVE|LK_NOWAIT, NULL, p)) != 0) 1769 continue; 1770 if ((error = dounmount(mp, MNT_FORCE, curproc, NULL)) != 0) { 1771 printf("unmount of %s failed with error %d\n", 1772 mp->mnt_stat.f_mntonname, error); 1773 allerror = 1; 1774 } 1775 } 1776 1777 if (allerror) { 1778 printf("WARNING: some file systems would not unmount\n"); 1779 if (again) { 1780 printf("retrying\n"); 1781 again = 0; 1782 goto retry; 1783 } 1784 } 1785} 1786 1787/* 1788 * Sync and unmount file systems before shutting down. 1789 */ 1790void 1791vfs_shutdown() 1792{ 1793 extern void acct_shutdown(void); 1794 1795 /* XXX Should suspend scheduling. */ 1796 (void) spl0(); 1797 1798 printf("syncing disks... "); 1799 1800 acct_shutdown(); 1801 1802 if (panicstr == 0) { 1803 /* Sync before unmount, in case we hang on something. */ 1804 sys_sync(&proc0, (void *)0, (register_t *)0); 1805 1806 /* Unmount file systems. */ 1807 vfs_unmountall(); 1808 } 1809 1810 if (vfs_syncwait(1)) 1811 printf("giving up\n"); 1812 else 1813 printf("done\n"); 1814} 1815 1816/* 1817 * perform sync() operation and wait for buffers to flush. 1818 * assumtions: called w/ scheduler disabled and physical io enabled 1819 * for now called at spl0() XXX 1820 */ 1821int 1822vfs_syncwait(verbose) 1823 int verbose; 1824{ 1825 register struct buf *bp; 1826 int iter, nbusy, dcount, s; 1827 struct proc *p; 1828 1829 p = curproc? curproc : &proc0; 1830 sys_sync(p, (void *)0, (register_t *)0); 1831 1832 /* Wait for sync to finish. */ 1833 dcount = 10000; 1834 for (iter = 0; iter < 20; iter++) { 1835 nbusy = 0; 1836 for (bp = &buf[nbuf]; --bp >= buf; ) { 1837 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1838 nbusy++; 1839 /* 1840 * With soft updates, some buffers that are 1841 * written will be remarked as dirty until other 1842 * buffers are written. 1843 */ 1844 if (bp->b_flags & B_DELWRI) { 1845 s = splbio(); 1846 bremfree(bp); 1847 bp->b_flags |= B_BUSY; 1848 splx(s); 1849 nbusy++; 1850 bawrite(bp); 1851 if (dcount-- <= 0) { 1852 if (verbose) 1853 printf("softdep "); 1854 return 1; 1855 } 1856 } 1857 } 1858 if (nbusy == 0) 1859 break; 1860 if (verbose) 1861 printf("%d ", nbusy); 1862 DELAY(40000 * iter); 1863 } 1864 1865 return nbusy; 1866} 1867 1868/* 1869 * posix file system related system variables. 1870 */ 1871int 1872fs_posix_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1873 int *name; 1874 u_int namelen; 1875 void *oldp; 1876 size_t *oldlenp; 1877 void *newp; 1878 size_t newlen; 1879 struct proc *p; 1880{ 1881 /* all sysctl names at this level are terminal */ 1882 if (namelen != 1) 1883 return (ENOTDIR); 1884 1885 switch (name[0]) { 1886 case FS_POSIX_SETUID: 1887 if (newp && securelevel > 0) 1888 return (EPERM); 1889 return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear)); 1890 default: 1891 return (EOPNOTSUPP); 1892 } 1893 /* NOTREACHED */ 1894} 1895 1896/* 1897 * file system related system variables. 1898 */ 1899int 1900fs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1901 int *name; 1902 u_int namelen; 1903 void *oldp; 1904 size_t *oldlenp; 1905 void *newp; 1906 size_t newlen; 1907 struct proc *p; 1908{ 1909 sysctlfn *fn; 1910 1911 switch (name[0]) { 1912 case FS_POSIX: 1913 fn = fs_posix_sysctl; 1914 break; 1915 default: 1916 return (EOPNOTSUPP); 1917 } 1918 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1919} 1920 1921 1922/* 1923 * Routines dealing with vnodes and buffers 1924 */ 1925 1926/* 1927 * Wait for all outstanding I/Os to complete 1928 * 1929 * Manipulates v_numoutput. Must be called at splbio() 1930 */ 1931int 1932vwaitforio(vp, slpflag, wmesg, timeo) 1933 struct vnode *vp; 1934 int slpflag, timeo; 1935 char *wmesg; 1936{ 1937 int error = 0; 1938 1939 splassert(IPL_BIO); 1940 1941 while (vp->v_numoutput) { 1942 vp->v_bioflag |= VBIOWAIT; 1943 error = tsleep(&vp->v_numoutput, 1944 slpflag | (PRIBIO + 1), wmesg, timeo); 1945 if (error) 1946 break; 1947 } 1948 1949 return (error); 1950} 1951 1952 1953/* 1954 * Update outstanding I/O count and do wakeup if requested. 1955 * 1956 * Manipulates v_numoutput. Must be called at splbio() 1957 */ 1958void 1959vwakeup(vp) 1960 struct vnode *vp; 1961{ 1962 splassert(IPL_BIO); 1963 1964 if (vp != NULL) { 1965 if (vp->v_numoutput-- == 0) 1966 panic("vwakeup: neg numoutput"); 1967 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1968 vp->v_bioflag &= ~VBIOWAIT; 1969 wakeup(&vp->v_numoutput); 1970 } 1971 } 1972} 1973 1974/* 1975 * Flush out and invalidate all buffers associated with a vnode. 1976 * Called with the underlying object locked. 1977 */ 1978int 1979vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) 1980 register struct vnode *vp; 1981 int flags; 1982 struct ucred *cred; 1983 struct proc *p; 1984 int slpflag, slptimeo; 1985{ 1986 register struct buf *bp; 1987 struct buf *nbp, *blist; 1988 int s, error; 1989 1990 if (flags & V_SAVE) { 1991 s = splbio(); 1992 vwaitforio(vp, 0, "vinvalbuf", 0); 1993 if (vp->v_dirtyblkhd.lh_first != NULL) { 1994 splx(s); 1995 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1996 return (error); 1997 s = splbio(); 1998 if (vp->v_numoutput > 0 || 1999 vp->v_dirtyblkhd.lh_first != NULL) 2000 panic("vinvalbuf: dirty bufs"); 2001 } 2002 splx(s); 2003 } 2004loop: 2005 s = splbio(); 2006 for (;;) { 2007 if ((blist = vp->v_cleanblkhd.lh_first) && 2008 (flags & V_SAVEMETA)) 2009 while (blist && blist->b_lblkno < 0) 2010 blist = blist->b_vnbufs.le_next; 2011 if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && 2012 (flags & V_SAVEMETA)) 2013 while (blist && blist->b_lblkno < 0) 2014 blist = blist->b_vnbufs.le_next; 2015 if (!blist) 2016 break; 2017 2018 for (bp = blist; bp; bp = nbp) { 2019 nbp = bp->b_vnbufs.le_next; 2020 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 2021 continue; 2022 if (bp->b_flags & B_BUSY) { 2023 bp->b_flags |= B_WANTED; 2024 error = tsleep(bp, slpflag | (PRIBIO + 1), 2025 "vinvalbuf", slptimeo); 2026 if (error) { 2027 splx(s); 2028 return (error); 2029 } 2030 break; 2031 } 2032 bremfree(bp); 2033 bp->b_flags |= B_BUSY; 2034 /* 2035 * XXX Since there are no node locks for NFS, I believe 2036 * there is a slight chance that a delayed write will 2037 * occur while sleeping just above, so check for it. 2038 */ 2039 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 2040 splx(s); 2041 (void) VOP_BWRITE(bp); 2042 goto loop; 2043 } 2044 bp->b_flags |= B_INVAL; 2045 brelse(bp); 2046 } 2047 } 2048 if (!(flags & V_SAVEMETA) && 2049 (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) 2050 panic("vinvalbuf: flush failed"); 2051 splx(s); 2052 return (0); 2053} 2054 2055void 2056vflushbuf(vp, sync) 2057 register struct vnode *vp; 2058 int sync; 2059{ 2060 register struct buf *bp, *nbp; 2061 int s; 2062 2063loop: 2064 s = splbio(); 2065 for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) { 2066 nbp = bp->b_vnbufs.le_next; 2067 if ((bp->b_flags & B_BUSY)) 2068 continue; 2069 if ((bp->b_flags & B_DELWRI) == 0) 2070 panic("vflushbuf: not dirty"); 2071 bremfree(bp); 2072 bp->b_flags |= B_BUSY; 2073 splx(s); 2074 /* 2075 * Wait for I/O associated with indirect blocks to complete, 2076 * since there is no way to quickly wait for them below. 2077 */ 2078 if (bp->b_vp == vp || sync == 0) 2079 (void) bawrite(bp); 2080 else 2081 (void) bwrite(bp); 2082 goto loop; 2083 } 2084 if (sync == 0) { 2085 splx(s); 2086 return; 2087 } 2088 vwaitforio(vp, 0, "vflushbuf", 0); 2089 if (vp->v_dirtyblkhd.lh_first != NULL) { 2090 splx(s); 2091 vprint("vflushbuf: dirty", vp); 2092 goto loop; 2093 } 2094 splx(s); 2095} 2096 2097/* 2098 * Associate a buffer with a vnode. 2099 * 2100 * Manipulates buffer vnode queues. Must be called at splbio(). 2101 */ 2102void 2103bgetvp(vp, bp) 2104 register struct vnode *vp; 2105 register struct buf *bp; 2106{ 2107 splassert(IPL_BIO); 2108 2109 2110 if (bp->b_vp) 2111 panic("bgetvp: not free"); 2112 vhold(vp); 2113 bp->b_vp = vp; 2114 if (vp->v_type == VBLK || vp->v_type == VCHR) 2115 bp->b_dev = vp->v_rdev; 2116 else 2117 bp->b_dev = NODEV; 2118 /* 2119 * Insert onto list for new vnode. 2120 */ 2121 bufinsvn(bp, &vp->v_cleanblkhd); 2122} 2123 2124/* 2125 * Disassociate a buffer from a vnode. 2126 * 2127 * Manipulates vnode buffer queues. Must be called at splbio(). 2128 */ 2129void 2130brelvp(bp) 2131 register struct buf *bp; 2132{ 2133 struct vnode *vp; 2134 2135 splassert(IPL_BIO); 2136 2137 if ((vp = bp->b_vp) == (struct vnode *) 0) 2138 panic("brelvp: NULL"); 2139 /* 2140 * Delete from old vnode list, if on one. 2141 */ 2142 if (bp->b_vnbufs.le_next != NOLIST) 2143 bufremvn(bp); 2144 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2145 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 2146 vp->v_bioflag &= ~VBIOONSYNCLIST; 2147 LIST_REMOVE(vp, v_synclist); 2148 } 2149 bp->b_vp = (struct vnode *) 0; 2150 2151 simple_lock(&vp->v_interlock); 2152#ifdef DIAGNOSTIC 2153 if (vp->v_holdcnt == 0) 2154 panic("brelvp: holdcnt"); 2155#endif 2156 vp->v_holdcnt--; 2157 2158 /* 2159 * If it is on the holdlist and the hold count drops to 2160 * zero, move it to the free list. 2161 */ 2162 if ((vp->v_bioflag & VBIOONFREELIST) && 2163 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 2164 simple_lock(&vnode_free_list_slock); 2165 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 2166 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 2167 simple_unlock(&vnode_free_list_slock); 2168 } 2169 simple_unlock(&vp->v_interlock); 2170} 2171 2172/* 2173 * Replaces the current vnode associated with the buffer, if any 2174 * with a new vnode. 2175 * 2176 * If an output I/O is pending on the buffer, the old vnode is 2177 * I/O count is adjusted. 2178 * 2179 * Ignores vnode buffer queues. Must be called at splbio(). 2180 */ 2181void 2182buf_replacevnode(bp, newvp) 2183 struct buf *bp; 2184 struct vnode *newvp; 2185{ 2186 struct vnode *oldvp = bp->b_vp; 2187 2188 splassert(IPL_BIO); 2189 2190 if (oldvp) 2191 brelvp(bp); 2192 2193 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2194 newvp->v_numoutput++; /* put it on swapdev */ 2195 vwakeup(oldvp); 2196 } 2197 2198 bgetvp(newvp, bp); 2199 bufremvn(bp); 2200} 2201 2202/* 2203 * Used to assign buffers to the appropriate clean or dirty list on 2204 * the vnode and to add newly dirty vnodes to the appropriate 2205 * filesystem syncer list. 2206 * 2207 * Manipulates vnode buffer queues. Must be called at splbio(). 2208 */ 2209void 2210reassignbuf(bp) 2211 struct buf *bp; 2212{ 2213 struct buflists *listheadp; 2214 int delay; 2215 struct vnode *vp = bp->b_vp; 2216 2217 splassert(IPL_BIO); 2218 2219 /* 2220 * Delete from old vnode list, if on one. 2221 */ 2222 if (bp->b_vnbufs.le_next != NOLIST) 2223 bufremvn(bp); 2224 /* 2225 * If dirty, put on list of dirty buffers; 2226 * otherwise insert onto list of clean buffers. 2227 */ 2228 if ((bp->b_flags & B_DELWRI) == 0) { 2229 listheadp = &vp->v_cleanblkhd; 2230 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2231 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 2232 vp->v_bioflag &= ~VBIOONSYNCLIST; 2233 LIST_REMOVE(vp, v_synclist); 2234 } 2235 } else { 2236 listheadp = &vp->v_dirtyblkhd; 2237 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2238 switch (vp->v_type) { 2239 case VDIR: 2240 delay = syncdelay / 2; 2241 break; 2242 case VBLK: 2243 if (vp->v_specmountpoint != NULL) { 2244 delay = syncdelay / 3; 2245 break; 2246 } 2247 /* fall through */ 2248 default: 2249 delay = syncdelay; 2250 } 2251 vn_syncer_add_to_worklist(vp, delay); 2252 } 2253 } 2254 bufinsvn(bp, listheadp); 2255} 2256 2257int 2258vfs_register(vfs) 2259 struct vfsconf *vfs; 2260{ 2261 struct vfsconf *vfsp; 2262 struct vfsconf **vfspp; 2263 2264#ifdef DIAGNOSTIC 2265 /* Paranoia? */ 2266 if (vfs->vfc_refcount != 0) 2267 printf("vfs_register called with vfc_refcount > 0\n"); 2268#endif 2269 2270 /* Check if filesystem already known */ 2271 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2272 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) 2273 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2274 return (EEXIST); 2275 2276 if (vfs->vfc_typenum > maxvfsconf) 2277 maxvfsconf = vfs->vfc_typenum; 2278 2279 vfs->vfc_next = NULL; 2280 2281 /* Add to the end of the list */ 2282 *vfspp = vfs; 2283 2284 /* Call vfs_init() */ 2285 if (vfs->vfc_vfsops->vfs_init) 2286 (*(vfs->vfc_vfsops->vfs_init))(vfs); 2287 2288 return 0; 2289} 2290 2291int 2292vfs_unregister(vfs) 2293 struct vfsconf *vfs; 2294{ 2295 struct vfsconf *vfsp; 2296 struct vfsconf **vfspp; 2297 int maxtypenum; 2298 2299 /* Find our vfsconf struct */ 2300 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2301 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) { 2302 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2303 break; 2304 } 2305 2306 if (!vfsp) /* Not found */ 2307 return (ENOENT); 2308 2309 if (vfsp->vfc_refcount) /* In use */ 2310 return (EBUSY); 2311 2312 /* Remove from list and free */ 2313 *vfspp = vfsp->vfc_next; 2314 2315 maxtypenum = 0; 2316 2317 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 2318 if (vfsp->vfc_typenum > maxtypenum) 2319 maxtypenum = vfsp->vfc_typenum; 2320 2321 maxvfsconf = maxtypenum; 2322 return 0; 2323} 2324 2325/* 2326 * Check if vnode represents a disk device 2327 */ 2328int 2329vn_isdisk(vp, errp) 2330 struct vnode *vp; 2331 int *errp; 2332{ 2333 if (vp->v_type != VBLK && vp->v_type != VCHR) 2334 return (0); 2335 2336 return (1); 2337} 2338