Annotation of sys/kern/vfs_subr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: vfs_subr.c,v 1.155 2007/08/07 04:32:45 beck 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:
! 68: enum vtype iftovt_tab[16] = {
! 69: VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
! 70: VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
! 71: };
! 72:
! 73: int vttoif_tab[9] = {
! 74: 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
! 75: S_IFSOCK, S_IFIFO, S_IFMT,
! 76: };
! 77:
! 78: int doforce = 1; /* 1 => permit forcible unmounting */
! 79: int prtactive = 0; /* 1 => print out reclaim of active vnodes */
! 80: int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */
! 81:
! 82: /*
! 83: * Insq/Remq for the vnode usage lists.
! 84: */
! 85: #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs)
! 86: #define bufremvn(bp) { \
! 87: LIST_REMOVE(bp, b_vnbufs); \
! 88: LIST_NEXT(bp, b_vnbufs) = NOLIST; \
! 89: }
! 90:
! 91: struct freelst vnode_hold_list; /* list of vnodes referencing buffers */
! 92: struct freelst vnode_free_list; /* vnode free list */
! 93:
! 94: struct mntlist mountlist; /* mounted filesystem list */
! 95:
! 96: void vclean(struct vnode *, int, struct proc *);
! 97:
! 98: void insmntque(struct vnode *, struct mount *);
! 99: int getdevvp(dev_t, struct vnode **, enum vtype);
! 100:
! 101: int vfs_hang_addrlist(struct mount *, struct netexport *,
! 102: struct export_args *);
! 103: int vfs_free_netcred(struct radix_node *, void *);
! 104: void vfs_free_addrlist(struct netexport *);
! 105: void vputonfreelist(struct vnode *);
! 106:
! 107: int vflush_vnode(struct vnode *, void *);
! 108: int maxvnodes;
! 109:
! 110: #ifdef DEBUG
! 111: void printlockedvnodes(void);
! 112: #endif
! 113:
! 114: struct pool vnode_pool;
! 115:
! 116: /*
! 117: * Initialize the vnode management data structures.
! 118: */
! 119: void
! 120: vntblinit(void)
! 121: {
! 122: /* buffer cache may need a vnode for each buffer */
! 123: maxvnodes = desiredvnodes;
! 124: pool_init(&vnode_pool, sizeof(struct vnode), 0, 0, 0, "vnodes",
! 125: &pool_allocator_nointr);
! 126: TAILQ_INIT(&vnode_hold_list);
! 127: TAILQ_INIT(&vnode_free_list);
! 128: CIRCLEQ_INIT(&mountlist);
! 129: /*
! 130: * Initialize the filesystem syncer.
! 131: */
! 132: vn_initialize_syncerd();
! 133: }
! 134:
! 135: /*
! 136: * Mark a mount point as busy. Used to synchronize access and to delay
! 137: * unmounting.
! 138: *
! 139: * Default behaviour is to attempt getting a READ lock and in case of an
! 140: * ongoing unmount, to wait for it to finish and then return failure.
! 141: */
! 142: int
! 143: vfs_busy(struct mount *mp, int flags)
! 144: {
! 145: int rwflags = 0;
! 146:
! 147: /* new mountpoints need their lock initialised */
! 148: if (mp->mnt_lock.rwl_name == NULL)
! 149: rw_init(&mp->mnt_lock, "vfslock");
! 150:
! 151: if (flags & VB_WRITE)
! 152: rwflags |= RW_WRITE;
! 153: else
! 154: rwflags |= RW_READ;
! 155:
! 156: if (flags & VB_WAIT)
! 157: rwflags |= RW_SLEEPFAIL;
! 158: else
! 159: rwflags |= RW_NOSLEEP;
! 160:
! 161: if (rw_enter(&mp->mnt_lock, rwflags))
! 162: return (EBUSY);
! 163:
! 164: return (0);
! 165: }
! 166:
! 167: /*
! 168: * Free a busy file system
! 169: */
! 170: void
! 171: vfs_unbusy(struct mount *mp)
! 172: {
! 173: rw_exit(&mp->mnt_lock);
! 174: }
! 175:
! 176: int
! 177: vfs_isbusy(struct mount *mp)
! 178: {
! 179: if (RWLOCK_OWNER(&mp->mnt_lock) > 0)
! 180: return (1);
! 181: else
! 182: return (0);
! 183: }
! 184:
! 185: /*
! 186: * Lookup a filesystem type, and if found allocate and initialize
! 187: * a mount structure for it.
! 188: *
! 189: * Devname is usually updated by mount(8) after booting.
! 190: */
! 191: int
! 192: vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp)
! 193: {
! 194: struct vfsconf *vfsp;
! 195: struct mount *mp;
! 196:
! 197: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
! 198: if (!strcmp(vfsp->vfc_name, fstypename))
! 199: break;
! 200: if (vfsp == NULL)
! 201: return (ENODEV);
! 202: mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK);
! 203: bzero(mp, sizeof(struct mount));
! 204: (void)vfs_busy(mp, VB_READ|VB_NOWAIT);
! 205: LIST_INIT(&mp->mnt_vnodelist);
! 206: mp->mnt_vfc = vfsp;
! 207: mp->mnt_op = vfsp->vfc_vfsops;
! 208: mp->mnt_flag = MNT_RDONLY;
! 209: mp->mnt_vnodecovered = NULLVP;
! 210: vfsp->vfc_refcount++;
! 211: mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
! 212: strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
! 213: mp->mnt_stat.f_mntonname[0] = '/';
! 214: (void)copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0);
! 215: *mpp = mp;
! 216: return (0);
! 217: }
! 218:
! 219: /*
! 220: * Find an appropriate filesystem to use for the root. If a filesystem
! 221: * has not been preselected, walk through the list of known filesystems
! 222: * trying those that have mountroot routines, and try them until one
! 223: * works or we have tried them all.
! 224: */
! 225: int
! 226: vfs_mountroot(void)
! 227: {
! 228: struct vfsconf *vfsp;
! 229: int error;
! 230:
! 231: if (mountroot != NULL)
! 232: return ((*mountroot)());
! 233: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
! 234: if (vfsp->vfc_mountroot == NULL)
! 235: continue;
! 236: if ((error = (*vfsp->vfc_mountroot)()) == 0)
! 237: return (0);
! 238: printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
! 239: }
! 240: return (ENODEV);
! 241: }
! 242:
! 243: /*
! 244: * Lookup a mount point by filesystem identifier.
! 245: */
! 246: struct mount *
! 247: vfs_getvfs(fsid_t *fsid)
! 248: {
! 249: struct mount *mp;
! 250:
! 251: CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) {
! 252: if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
! 253: mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) {
! 254: return (mp);
! 255: }
! 256: }
! 257:
! 258: return (NULL);
! 259: }
! 260:
! 261:
! 262: /*
! 263: * Get a new unique fsid
! 264: */
! 265: void
! 266: vfs_getnewfsid(struct mount *mp)
! 267: {
! 268: static u_short xxxfs_mntid;
! 269:
! 270: fsid_t tfsid;
! 271: int mtype;
! 272:
! 273: mtype = mp->mnt_vfc->vfc_typenum;
! 274: mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0);
! 275: mp->mnt_stat.f_fsid.val[1] = mtype;
! 276: if (xxxfs_mntid == 0)
! 277: ++xxxfs_mntid;
! 278: tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid);
! 279: tfsid.val[1] = mtype;
! 280: if (!CIRCLEQ_EMPTY(&mountlist)) {
! 281: while (vfs_getvfs(&tfsid)) {
! 282: tfsid.val[0]++;
! 283: xxxfs_mntid++;
! 284: }
! 285: }
! 286: mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
! 287: }
! 288:
! 289: /*
! 290: * Make a 'unique' number from a mount type name.
! 291: * Note that this is no longer used for ffs which
! 292: * now has an on-disk filesystem id.
! 293: */
! 294: long
! 295: makefstype(char *type)
! 296: {
! 297: long rv;
! 298:
! 299: for (rv = 0; *type; type++) {
! 300: rv <<= 2;
! 301: rv ^= *type;
! 302: }
! 303: return rv;
! 304: }
! 305:
! 306: /*
! 307: * Set vnode attributes to VNOVAL
! 308: */
! 309: void
! 310: vattr_null(struct vattr *vap)
! 311: {
! 312:
! 313: vap->va_type = VNON;
! 314: /* XXX These next two used to be one line, but for a GCC bug. */
! 315: vap->va_size = VNOVAL;
! 316: vap->va_bytes = VNOVAL;
! 317: vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
! 318: vap->va_fsid = vap->va_fileid =
! 319: vap->va_blocksize = vap->va_rdev =
! 320: vap->va_atime.tv_sec = vap->va_atime.tv_nsec =
! 321: vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec =
! 322: vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec =
! 323: vap->va_flags = vap->va_gen = VNOVAL;
! 324: vap->va_vaflags = 0;
! 325: }
! 326:
! 327: /*
! 328: * Routines having to do with the management of the vnode table.
! 329: */
! 330: extern int (**dead_vnodeop_p)(void *);
! 331: long numvnodes;
! 332:
! 333: /*
! 334: * Return the next vnode from the free list.
! 335: */
! 336: int
! 337: getnewvnode(enum vtagtype tag, struct mount *mp, int (**vops)(void *),
! 338: struct vnode **vpp)
! 339: {
! 340: struct proc *p = curproc;
! 341: struct freelst *listhd;
! 342: static int toggle;
! 343: struct vnode *vp;
! 344: int s;
! 345:
! 346: /*
! 347: * We must choose whether to allocate a new vnode or recycle an
! 348: * existing one. The criterion for allocating a new one is that
! 349: * the total number of vnodes is less than the number desired or
! 350: * there are no vnodes on either free list. Generally we only
! 351: * want to recycle vnodes that have no buffers associated with
! 352: * them, so we look first on the vnode_free_list. If it is empty,
! 353: * we next consider vnodes with referencing buffers on the
! 354: * vnode_hold_list. The toggle ensures that half the time we
! 355: * will use a buffer from the vnode_hold_list, and half the time
! 356: * we will allocate a new one unless the list has grown to twice
! 357: * the desired size. We are reticent to recycle vnodes from the
! 358: * vnode_hold_list because we will lose the identity of all its
! 359: * referencing buffers.
! 360: */
! 361: toggle ^= 1;
! 362: if (numvnodes > 2 * maxvnodes)
! 363: toggle = 0;
! 364:
! 365: s = splbio();
! 366: if ((numvnodes < maxvnodes) ||
! 367: ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) &&
! 368: ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) {
! 369: splx(s);
! 370: vp = pool_get(&vnode_pool, PR_WAITOK);
! 371: bzero((char *)vp, sizeof *vp);
! 372: numvnodes++;
! 373: } else {
! 374: for (vp = TAILQ_FIRST(listhd); vp != NULLVP;
! 375: vp = TAILQ_NEXT(vp, v_freelist)) {
! 376: if (VOP_ISLOCKED(vp) == 0)
! 377: break;
! 378: }
! 379: /*
! 380: * Unless this is a bad time of the month, at most
! 381: * the first NCPUS items on the free list are
! 382: * locked, so this is close enough to being empty.
! 383: */
! 384: if (vp == NULL) {
! 385: splx(s);
! 386: tablefull("vnode");
! 387: *vpp = 0;
! 388: return (ENFILE);
! 389: }
! 390:
! 391: #ifdef DIAGNOSTIC
! 392: if (vp->v_usecount) {
! 393: vprint("free vnode", vp);
! 394: panic("free vnode isn't");
! 395: }
! 396: #endif
! 397:
! 398: TAILQ_REMOVE(listhd, vp, v_freelist);
! 399: vp->v_bioflag &= ~VBIOONFREELIST;
! 400: splx(s);
! 401:
! 402: if (vp->v_type != VBAD)
! 403: vgonel(vp, p);
! 404: #ifdef DIAGNOSTIC
! 405: if (vp->v_data) {
! 406: vprint("cleaned vnode", vp);
! 407: panic("cleaned vnode isn't");
! 408: }
! 409: s = splbio();
! 410: if (vp->v_numoutput)
! 411: panic("Clean vnode has pending I/O's");
! 412: splx(s);
! 413: #endif
! 414: vp->v_flag = 0;
! 415: vp->v_socket = 0;
! 416: }
! 417: vp->v_type = VNON;
! 418: cache_purge(vp);
! 419: vp->v_tag = tag;
! 420: vp->v_op = vops;
! 421: insmntque(vp, mp);
! 422: *vpp = vp;
! 423: vp->v_usecount = 1;
! 424: vp->v_data = 0;
! 425: simple_lock_init(&vp->v_uvm.u_obj.vmobjlock);
! 426: return (0);
! 427: }
! 428:
! 429: /*
! 430: * Move a vnode from one mount queue to another.
! 431: */
! 432: void
! 433: insmntque(struct vnode *vp, struct mount *mp)
! 434: {
! 435: /*
! 436: * Delete from old mount point vnode list, if on one.
! 437: */
! 438: if (vp->v_mount != NULL)
! 439: LIST_REMOVE(vp, v_mntvnodes);
! 440: /*
! 441: * Insert into list of vnodes for the new mount point, if available.
! 442: */
! 443: if ((vp->v_mount = mp) != NULL)
! 444: LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
! 445: }
! 446:
! 447: /*
! 448: * Create a vnode for a block device.
! 449: * Used for root filesystem, argdev, and swap areas.
! 450: * Also used for memory file system special devices.
! 451: */
! 452: int
! 453: bdevvp(dev_t dev, struct vnode **vpp)
! 454: {
! 455: return (getdevvp(dev, vpp, VBLK));
! 456: }
! 457:
! 458: /*
! 459: * Create a vnode for a character device.
! 460: * Used for console handling.
! 461: */
! 462: int
! 463: cdevvp(dev_t dev, struct vnode **vpp)
! 464: {
! 465: return (getdevvp(dev, vpp, VCHR));
! 466: }
! 467:
! 468: /*
! 469: * Create a vnode for a device.
! 470: * Used by bdevvp (block device) for root file system etc.,
! 471: * and by cdevvp (character device) for console.
! 472: */
! 473: int
! 474: getdevvp(dev_t dev, struct vnode **vpp, enum vtype type)
! 475: {
! 476: struct vnode *vp;
! 477: struct vnode *nvp;
! 478: int error;
! 479:
! 480: if (dev == NODEV) {
! 481: *vpp = NULLVP;
! 482: return (0);
! 483: }
! 484: error = getnewvnode(VT_NON, NULL, spec_vnodeop_p, &nvp);
! 485: if (error) {
! 486: *vpp = NULLVP;
! 487: return (error);
! 488: }
! 489: vp = nvp;
! 490: vp->v_type = type;
! 491: if ((nvp = checkalias(vp, dev, NULL)) != 0) {
! 492: vput(vp);
! 493: vp = nvp;
! 494: }
! 495: *vpp = vp;
! 496: return (0);
! 497: }
! 498:
! 499: /*
! 500: * Check to see if the new vnode represents a special device
! 501: * for which we already have a vnode (either because of
! 502: * bdevvp() or because of a different vnode representing
! 503: * the same block device). If such an alias exists, deallocate
! 504: * the existing contents and return the aliased vnode. The
! 505: * caller is responsible for filling it with its new contents.
! 506: */
! 507: struct vnode *
! 508: checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp)
! 509: {
! 510: struct proc *p = curproc;
! 511: struct vnode *vp;
! 512: struct vnode **vpp;
! 513:
! 514: if (nvp->v_type != VBLK && nvp->v_type != VCHR)
! 515: return (NULLVP);
! 516:
! 517: vpp = &speclisth[SPECHASH(nvp_rdev)];
! 518: loop:
! 519: for (vp = *vpp; vp; vp = vp->v_specnext) {
! 520: if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) {
! 521: continue;
! 522: }
! 523: /*
! 524: * Alias, but not in use, so flush it out.
! 525: */
! 526: if (vp->v_usecount == 0) {
! 527: vgonel(vp, p);
! 528: goto loop;
! 529: }
! 530: if (vget(vp, LK_EXCLUSIVE, p)) {
! 531: goto loop;
! 532: }
! 533: break;
! 534: }
! 535:
! 536: /*
! 537: * Common case is actually in the if statement
! 538: */
! 539: if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) {
! 540: MALLOC(nvp->v_specinfo, struct specinfo *,
! 541: sizeof(struct specinfo), M_VNODE, M_WAITOK);
! 542: nvp->v_rdev = nvp_rdev;
! 543: nvp->v_hashchain = vpp;
! 544: nvp->v_specnext = *vpp;
! 545: nvp->v_specmountpoint = NULL;
! 546: nvp->v_speclockf = NULL;
! 547: bzero(nvp->v_specbitmap, sizeof(nvp->v_specbitmap));
! 548: *vpp = nvp;
! 549: if (vp != NULLVP) {
! 550: nvp->v_flag |= VALIASED;
! 551: vp->v_flag |= VALIASED;
! 552: vput(vp);
! 553: }
! 554: return (NULLVP);
! 555: }
! 556:
! 557: /*
! 558: * This code is the uncommon case. It is called in case
! 559: * we found an alias that was VT_NON && vtype of VBLK
! 560: * This means we found a block device that was created
! 561: * using bdevvp.
! 562: * An example of such a vnode is the root partition device vnode
! 563: * created in ffs_mountroot.
! 564: *
! 565: * The vnodes created by bdevvp should not be aliased (why?).
! 566: */
! 567:
! 568: VOP_UNLOCK(vp, 0, p);
! 569: vclean(vp, 0, p);
! 570: vp->v_op = nvp->v_op;
! 571: vp->v_tag = nvp->v_tag;
! 572: nvp->v_type = VNON;
! 573: insmntque(vp, mp);
! 574: return (vp);
! 575: }
! 576:
! 577: /*
! 578: * Grab a particular vnode from the free list, increment its
! 579: * reference count and lock it. If the vnode lock bit is set,
! 580: * the vnode is being eliminated in vgone. In that case, we
! 581: * cannot grab it, so the process is awakened when the
! 582: * transition is completed, and an error code is returned to
! 583: * indicate that the vnode is no longer usable, possibly
! 584: * having been changed to a new file system type.
! 585: */
! 586: int
! 587: vget(struct vnode *vp, int flags, struct proc *p)
! 588: {
! 589: int error, s, onfreelist;
! 590:
! 591: /*
! 592: * If the vnode is in the process of being cleaned out for
! 593: * another use, we wait for the cleaning to finish and then
! 594: * return failure. Cleaning is determined by checking that
! 595: * the VXLOCK flag is set.
! 596: */
! 597:
! 598: if (vp->v_flag & VXLOCK) {
! 599: if (flags & LK_NOWAIT) {
! 600: return (EBUSY);
! 601: }
! 602:
! 603: vp->v_flag |= VXWANT;
! 604: ltsleep(vp, PINOD | PNORELOCK, "vget", 0, NULL);
! 605: return (ENOENT);
! 606: }
! 607:
! 608: onfreelist = vp->v_bioflag & VBIOONFREELIST;
! 609: if (vp->v_usecount == 0 && onfreelist) {
! 610: s = splbio();
! 611: if (vp->v_holdcnt > 0)
! 612: TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
! 613: else
! 614: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
! 615: vp->v_bioflag &= ~VBIOONFREELIST;
! 616: splx(s);
! 617: }
! 618:
! 619: vp->v_usecount++;
! 620: if (flags & LK_TYPE_MASK) {
! 621: if ((error = vn_lock(vp, flags, p)) != 0) {
! 622: vp->v_usecount--;
! 623: if (vp->v_usecount == 0 && onfreelist)
! 624: vputonfreelist(vp);
! 625: }
! 626: return (error);
! 627: }
! 628:
! 629: return (0);
! 630: }
! 631:
! 632:
! 633: /* Vnode reference. */
! 634: void
! 635: vref(struct vnode *vp)
! 636: {
! 637: #ifdef DIAGNOSTIC
! 638: if (vp->v_usecount == 0)
! 639: panic("vref used where vget required");
! 640: #endif
! 641: vp->v_usecount++;
! 642: }
! 643:
! 644: void
! 645: vputonfreelist(struct vnode *vp)
! 646: {
! 647: int s;
! 648: struct freelst *lst;
! 649:
! 650: s = splbio();
! 651: #ifdef DIAGNOSTIC
! 652: if (vp->v_usecount != 0)
! 653: panic("Use count is not zero!");
! 654:
! 655: if (vp->v_bioflag & VBIOONFREELIST) {
! 656: vprint("vnode already on free list: ", vp);
! 657: panic("vnode already on free list");
! 658: }
! 659: #endif
! 660:
! 661: vp->v_bioflag |= VBIOONFREELIST;
! 662:
! 663: if (vp->v_holdcnt > 0)
! 664: lst = &vnode_hold_list;
! 665: else
! 666: lst = &vnode_free_list;
! 667:
! 668: if (vp->v_type == VBAD)
! 669: TAILQ_INSERT_HEAD(lst, vp, v_freelist);
! 670: else
! 671: TAILQ_INSERT_TAIL(lst, vp, v_freelist);
! 672:
! 673: splx(s);
! 674: }
! 675:
! 676: /*
! 677: * vput(), just unlock and vrele()
! 678: */
! 679: void
! 680: vput(struct vnode *vp)
! 681: {
! 682: struct proc *p = curproc;
! 683:
! 684: #ifdef DIAGNOSTIC
! 685: if (vp == NULL)
! 686: panic("vput: null vp");
! 687: #endif
! 688:
! 689: #ifdef DIAGNOSTIC
! 690: if (vp->v_usecount == 0) {
! 691: vprint("vput: bad ref count", vp);
! 692: panic("vput: ref cnt");
! 693: }
! 694: #endif
! 695: vp->v_usecount--;
! 696: if (vp->v_usecount > 0) {
! 697: VOP_UNLOCK(vp, 0, p);
! 698: return;
! 699: }
! 700:
! 701: #ifdef DIAGNOSTIC
! 702: if (vp->v_writecount != 0) {
! 703: vprint("vput: bad writecount", vp);
! 704: panic("vput: v_writecount != 0");
! 705: }
! 706: #endif
! 707:
! 708: VOP_INACTIVE(vp, p);
! 709:
! 710: if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST))
! 711: vputonfreelist(vp);
! 712: }
! 713:
! 714: /*
! 715: * Vnode release - use for active VNODES.
! 716: * If count drops to zero, call inactive routine and return to freelist.
! 717: */
! 718: void
! 719: vrele(struct vnode *vp)
! 720: {
! 721: struct proc *p = curproc;
! 722:
! 723: #ifdef DIAGNOSTIC
! 724: if (vp == NULL)
! 725: panic("vrele: null vp");
! 726: #endif
! 727: #ifdef DIAGNOSTIC
! 728: if (vp->v_usecount == 0) {
! 729: vprint("vrele: bad ref count", vp);
! 730: panic("vrele: ref cnt");
! 731: }
! 732: #endif
! 733: vp->v_usecount--;
! 734: if (vp->v_usecount > 0) {
! 735: return;
! 736: }
! 737:
! 738: #ifdef DIAGNOSTIC
! 739: if (vp->v_writecount != 0) {
! 740: vprint("vrele: bad writecount", vp);
! 741: panic("vrele: v_writecount != 0");
! 742: }
! 743: #endif
! 744:
! 745: if (vn_lock(vp, LK_EXCLUSIVE, p)) {
! 746: #ifdef DIAGNOSTIC
! 747: vprint("vrele: cannot lock", vp);
! 748: #endif
! 749: return;
! 750: }
! 751:
! 752: VOP_INACTIVE(vp, p);
! 753:
! 754: if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST))
! 755: vputonfreelist(vp);
! 756: }
! 757:
! 758: void vhold(struct vnode *vp);
! 759:
! 760: /*
! 761: * Page or buffer structure gets a reference.
! 762: */
! 763: void
! 764: vhold(struct vnode *vp)
! 765: {
! 766: /*
! 767: * If it is on the freelist and the hold count is currently
! 768: * zero, move it to the hold list.
! 769: */
! 770: if ((vp->v_bioflag & VBIOONFREELIST) &&
! 771: vp->v_holdcnt == 0 && vp->v_usecount == 0) {
! 772: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
! 773: TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist);
! 774: }
! 775: vp->v_holdcnt++;
! 776: }
! 777:
! 778: /*
! 779: * Remove any vnodes in the vnode table belonging to mount point mp.
! 780: *
! 781: * If MNT_NOFORCE is specified, there should not be any active ones,
! 782: * return error if any are found (nb: this is a user error, not a
! 783: * system error). If MNT_FORCE is specified, detach any active vnodes
! 784: * that are found.
! 785: */
! 786: #ifdef DEBUG
! 787: int busyprt = 0; /* print out busy vnodes */
! 788: struct ctldebug debug1 = { "busyprt", &busyprt };
! 789: #endif
! 790:
! 791: int
! 792: vfs_mount_foreach_vnode(struct mount *mp,
! 793: int (*func)(struct vnode *, void *), void *arg) {
! 794: struct vnode *vp, *nvp;
! 795: int error = 0;
! 796:
! 797: loop:
! 798: for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) {
! 799: if (vp->v_mount != mp)
! 800: goto loop;
! 801: nvp = LIST_NEXT(vp, v_mntvnodes);
! 802:
! 803: error = func(vp, arg);
! 804:
! 805: if (error != 0)
! 806: break;
! 807: }
! 808:
! 809: return (error);
! 810: }
! 811:
! 812: struct vflush_args {
! 813: struct vnode *skipvp;
! 814: int busy;
! 815: int flags;
! 816: };
! 817:
! 818: int
! 819: vflush_vnode(struct vnode *vp, void *arg) {
! 820: struct vflush_args *va = arg;
! 821: struct proc *p = curproc;
! 822:
! 823: if (vp == va->skipvp) {
! 824: return (0);
! 825: }
! 826:
! 827: if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) {
! 828: return (0);
! 829: }
! 830:
! 831: /*
! 832: * If WRITECLOSE is set, only flush out regular file
! 833: * vnodes open for writing.
! 834: */
! 835: if ((va->flags & WRITECLOSE) &&
! 836: (vp->v_writecount == 0 || vp->v_type != VREG)) {
! 837: return (0);
! 838: }
! 839:
! 840: /*
! 841: * With v_usecount == 0, all we need to do is clear
! 842: * out the vnode data structures and we are done.
! 843: */
! 844: if (vp->v_usecount == 0) {
! 845: vgonel(vp, p);
! 846: return (0);
! 847: }
! 848:
! 849: /*
! 850: * If FORCECLOSE is set, forcibly close the vnode.
! 851: * For block or character devices, revert to an
! 852: * anonymous device. For all other files, just kill them.
! 853: */
! 854: if (va->flags & FORCECLOSE) {
! 855: if (vp->v_type != VBLK && vp->v_type != VCHR) {
! 856: vgonel(vp, p);
! 857: } else {
! 858: vclean(vp, 0, p);
! 859: vp->v_op = spec_vnodeop_p;
! 860: insmntque(vp, (struct mount *)0);
! 861: }
! 862: return (0);
! 863: }
! 864:
! 865: #ifdef DEBUG
! 866: if (busyprt)
! 867: vprint("vflush: busy vnode", vp);
! 868: #endif
! 869: va->busy++;
! 870: return (0);
! 871: }
! 872:
! 873: int
! 874: vflush(struct mount *mp, struct vnode *skipvp, int flags)
! 875: {
! 876: struct vflush_args va;
! 877: va.skipvp = skipvp;
! 878: va.busy = 0;
! 879: va.flags = flags;
! 880:
! 881: vfs_mount_foreach_vnode(mp, vflush_vnode, &va);
! 882:
! 883: if (va.busy)
! 884: return (EBUSY);
! 885: return (0);
! 886: }
! 887:
! 888: /*
! 889: * Disassociate the underlying file system from a vnode.
! 890: */
! 891: void
! 892: vclean(struct vnode *vp, int flags, struct proc *p)
! 893: {
! 894: int active;
! 895:
! 896: /*
! 897: * Check to see if the vnode is in use.
! 898: * If so we have to reference it before we clean it out
! 899: * so that its count cannot fall to zero and generate a
! 900: * race against ourselves to recycle it.
! 901: */
! 902: if ((active = vp->v_usecount) != 0)
! 903: vp->v_usecount++;
! 904:
! 905: /*
! 906: * Prevent the vnode from being recycled or
! 907: * brought into use while we clean it out.
! 908: */
! 909: if (vp->v_flag & VXLOCK)
! 910: panic("vclean: deadlock");
! 911: vp->v_flag |= VXLOCK;
! 912: /*
! 913: * Even if the count is zero, the VOP_INACTIVE routine may still
! 914: * have the object locked while it cleans it out. The VOP_LOCK
! 915: * ensures that the VOP_INACTIVE routine is done with its work.
! 916: * For active vnodes, it ensures that no other activity can
! 917: * occur while the underlying object is being cleaned out.
! 918: */
! 919: VOP_LOCK(vp, LK_DRAIN, p);
! 920:
! 921: /*
! 922: * Clean out any VM data associated with the vnode.
! 923: */
! 924: uvm_vnp_terminate(vp);
! 925: /*
! 926: * Clean out any buffers associated with the vnode.
! 927: */
! 928: if (flags & DOCLOSE)
! 929: vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0);
! 930: /*
! 931: * If purging an active vnode, it must be closed and
! 932: * deactivated before being reclaimed. Note that the
! 933: * VOP_INACTIVE will unlock the vnode
! 934: */
! 935: if (active) {
! 936: if (flags & DOCLOSE)
! 937: VOP_CLOSE(vp, FNONBLOCK, NOCRED, p);
! 938: VOP_INACTIVE(vp, p);
! 939: } else {
! 940: /*
! 941: * Any other processes trying to obtain this lock must first
! 942: * wait for VXLOCK to clear, then call the new lock operation.
! 943: */
! 944: VOP_UNLOCK(vp, 0, p);
! 945: }
! 946:
! 947: /*
! 948: * Reclaim the vnode.
! 949: */
! 950: if (VOP_RECLAIM(vp, p))
! 951: panic("vclean: cannot reclaim");
! 952: if (active) {
! 953: vp->v_usecount--;
! 954: if (vp->v_usecount == 0) {
! 955: if (vp->v_holdcnt > 0)
! 956: panic("vclean: not clean");
! 957: vputonfreelist(vp);
! 958: }
! 959: }
! 960: cache_purge(vp);
! 961:
! 962: /*
! 963: * Done with purge, notify sleepers of the grim news.
! 964: */
! 965: vp->v_op = dead_vnodeop_p;
! 966: VN_KNOTE(vp, NOTE_REVOKE);
! 967: vp->v_tag = VT_NON;
! 968: vp->v_flag &= ~VXLOCK;
! 969: #ifdef VFSDEBUG
! 970: vp->v_flag &= ~VLOCKSWORK;
! 971: #endif
! 972: if (vp->v_flag & VXWANT) {
! 973: vp->v_flag &= ~VXWANT;
! 974: wakeup(vp);
! 975: }
! 976: }
! 977:
! 978: /*
! 979: * Recycle an unused vnode to the front of the free list.
! 980: */
! 981: int
! 982: vrecycle(struct vnode *vp, struct proc *p)
! 983: {
! 984: if (vp->v_usecount == 0) {
! 985: vgonel(vp, p);
! 986: return (1);
! 987: }
! 988: return (0);
! 989: }
! 990:
! 991: /*
! 992: * Eliminate all activity associated with a vnode
! 993: * in preparation for reuse.
! 994: */
! 995: void
! 996: vgone(struct vnode *vp)
! 997: {
! 998: struct proc *p = curproc;
! 999: vgonel(vp, p);
! 1000: }
! 1001:
! 1002: /*
! 1003: * vgone, with struct proc.
! 1004: */
! 1005: void
! 1006: vgonel(struct vnode *vp, struct proc *p)
! 1007: {
! 1008: struct vnode *vq;
! 1009: struct vnode *vx;
! 1010: struct mount *mp;
! 1011: int flags;
! 1012:
! 1013: /*
! 1014: * If a vgone (or vclean) is already in progress,
! 1015: * wait until it is done and return.
! 1016: */
! 1017: if (vp->v_flag & VXLOCK) {
! 1018: vp->v_flag |= VXWANT;
! 1019: ltsleep(vp, PINOD | PNORELOCK, "vgone", 0, NULL);
! 1020: return;
! 1021: }
! 1022:
! 1023: /*
! 1024: * Clean out the filesystem specific data.
! 1025: */
! 1026: vclean(vp, DOCLOSE, p);
! 1027: /*
! 1028: * Delete from old mount point vnode list, if on one.
! 1029: */
! 1030: if (vp->v_mount != NULL)
! 1031: insmntque(vp, (struct mount *)0);
! 1032: /*
! 1033: * If special device, remove it from special device alias list
! 1034: * if it is on one.
! 1035: */
! 1036: if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
! 1037: if (*vp->v_hashchain == vp) {
! 1038: *vp->v_hashchain = vp->v_specnext;
! 1039: } else {
! 1040: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
! 1041: if (vq->v_specnext != vp)
! 1042: continue;
! 1043: vq->v_specnext = vp->v_specnext;
! 1044: break;
! 1045: }
! 1046: if (vq == NULL)
! 1047: panic("missing bdev");
! 1048: }
! 1049: if (vp->v_flag & VALIASED) {
! 1050: vx = NULL;
! 1051: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
! 1052: if (vq->v_rdev != vp->v_rdev ||
! 1053: vq->v_type != vp->v_type)
! 1054: continue;
! 1055: if (vx)
! 1056: break;
! 1057: vx = vq;
! 1058: }
! 1059: if (vx == NULL)
! 1060: panic("missing alias");
! 1061: if (vq == NULL)
! 1062: vx->v_flag &= ~VALIASED;
! 1063: vp->v_flag &= ~VALIASED;
! 1064: }
! 1065:
! 1066: /*
! 1067: * If we have a mount point associated with the vnode, we must
! 1068: * flush it out now, as to not leave a dangling zombie mount
! 1069: * point laying around in VFS.
! 1070: */
! 1071: mp = vp->v_specmountpoint;
! 1072: if (mp != NULL) {
! 1073: if (!vfs_busy(mp, VB_WRITE|VB_WAIT)) {
! 1074: flags = MNT_FORCE | MNT_DOOMED;
! 1075: dounmount(mp, flags, p, NULL);
! 1076: }
! 1077: }
! 1078:
! 1079: FREE(vp->v_specinfo, M_VNODE);
! 1080: vp->v_specinfo = NULL;
! 1081: }
! 1082: /*
! 1083: * If it is on the freelist and not already at the head,
! 1084: * move it to the head of the list.
! 1085: */
! 1086: vp->v_type = VBAD;
! 1087:
! 1088: /*
! 1089: * Move onto the free list, unless we were called from
! 1090: * getnewvnode and we're not on any free list
! 1091: */
! 1092: if (vp->v_usecount == 0 &&
! 1093: (vp->v_bioflag & VBIOONFREELIST)) {
! 1094: int s;
! 1095:
! 1096: s = splbio();
! 1097:
! 1098: if (vp->v_holdcnt > 0)
! 1099: panic("vgonel: not clean");
! 1100:
! 1101: if (TAILQ_FIRST(&vnode_free_list) != vp) {
! 1102: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
! 1103: TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
! 1104: }
! 1105: splx(s);
! 1106: }
! 1107: }
! 1108:
! 1109: /*
! 1110: * Lookup a vnode by device number.
! 1111: */
! 1112: int
! 1113: vfinddev(dev_t dev, enum vtype type, struct vnode **vpp)
! 1114: {
! 1115: struct vnode *vp;
! 1116: int rc =0;
! 1117:
! 1118: for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
! 1119: if (dev != vp->v_rdev || type != vp->v_type)
! 1120: continue;
! 1121: *vpp = vp;
! 1122: rc = 1;
! 1123: break;
! 1124: }
! 1125: return (rc);
! 1126: }
! 1127:
! 1128: /*
! 1129: * Revoke all the vnodes corresponding to the specified minor number
! 1130: * range (endpoints inclusive) of the specified major.
! 1131: */
! 1132: void
! 1133: vdevgone(int maj, int minl, int minh, enum vtype type)
! 1134: {
! 1135: struct vnode *vp;
! 1136: int mn;
! 1137:
! 1138: for (mn = minl; mn <= minh; mn++)
! 1139: if (vfinddev(makedev(maj, mn), type, &vp))
! 1140: VOP_REVOKE(vp, REVOKEALL);
! 1141: }
! 1142:
! 1143: /*
! 1144: * Calculate the total number of references to a special device.
! 1145: */
! 1146: int
! 1147: vcount(struct vnode *vp)
! 1148: {
! 1149: struct vnode *vq, *vnext;
! 1150: int count;
! 1151:
! 1152: loop:
! 1153: if ((vp->v_flag & VALIASED) == 0)
! 1154: return (vp->v_usecount);
! 1155: for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
! 1156: vnext = vq->v_specnext;
! 1157: if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
! 1158: continue;
! 1159: /*
! 1160: * Alias, but not in use, so flush it out.
! 1161: */
! 1162: if (vq->v_usecount == 0 && vq != vp) {
! 1163: vgone(vq);
! 1164: goto loop;
! 1165: }
! 1166: count += vq->v_usecount;
! 1167: }
! 1168: return (count);
! 1169: }
! 1170:
! 1171: #if defined(DEBUG) || defined(DIAGNOSTIC)
! 1172: /*
! 1173: * Print out a description of a vnode.
! 1174: */
! 1175: static char *typename[] =
! 1176: { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
! 1177:
! 1178: void
! 1179: vprint(char *label, struct vnode *vp)
! 1180: {
! 1181: char buf[64];
! 1182:
! 1183: if (label != NULL)
! 1184: printf("%s: ", label);
! 1185: printf("%p, type %s, use %u, write %u, hold %u,",
! 1186: vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount,
! 1187: vp->v_holdcnt);
! 1188: buf[0] = '\0';
! 1189: if (vp->v_flag & VROOT)
! 1190: strlcat(buf, "|VROOT", sizeof buf);
! 1191: if (vp->v_flag & VTEXT)
! 1192: strlcat(buf, "|VTEXT", sizeof buf);
! 1193: if (vp->v_flag & VSYSTEM)
! 1194: strlcat(buf, "|VSYSTEM", sizeof buf);
! 1195: if (vp->v_flag & VXLOCK)
! 1196: strlcat(buf, "|VXLOCK", sizeof buf);
! 1197: if (vp->v_flag & VXWANT)
! 1198: strlcat(buf, "|VXWANT", sizeof buf);
! 1199: if (vp->v_bioflag & VBIOWAIT)
! 1200: strlcat(buf, "|VBIOWAIT", sizeof buf);
! 1201: if (vp->v_bioflag & VBIOONFREELIST)
! 1202: strlcat(buf, "|VBIOONFREELIST", sizeof buf);
! 1203: if (vp->v_bioflag & VBIOONSYNCLIST)
! 1204: strlcat(buf, "|VBIOONSYNCLIST", sizeof buf);
! 1205: if (vp->v_flag & VALIASED)
! 1206: strlcat(buf, "|VALIASED", sizeof buf);
! 1207: if (buf[0] != '\0')
! 1208: printf(" flags (%s)", &buf[1]);
! 1209: if (vp->v_data == NULL) {
! 1210: printf("\n");
! 1211: } else {
! 1212: printf("\n\t");
! 1213: VOP_PRINT(vp);
! 1214: }
! 1215: }
! 1216: #endif /* DEBUG || DIAGNOSTIC */
! 1217:
! 1218: #ifdef DEBUG
! 1219: /*
! 1220: * List all of the locked vnodes in the system.
! 1221: * Called when debugging the kernel.
! 1222: */
! 1223: void
! 1224: printlockedvnodes(void)
! 1225: {
! 1226: struct mount *mp, *nmp;
! 1227: struct vnode *vp;
! 1228:
! 1229: printf("Locked vnodes\n");
! 1230:
! 1231: for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
! 1232: mp = nmp) {
! 1233: if (vfs_busy(mp, VB_READ|VB_NOWAIT)) {
! 1234: nmp = CIRCLEQ_NEXT(mp, mnt_list);
! 1235: continue;
! 1236: }
! 1237: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
! 1238: if (VOP_ISLOCKED(vp))
! 1239: vprint((char *)0, vp);
! 1240: }
! 1241: nmp = CIRCLEQ_NEXT(mp, mnt_list);
! 1242: vfs_unbusy(mp);
! 1243: }
! 1244:
! 1245: }
! 1246: #endif
! 1247:
! 1248: /*
! 1249: * Top level filesystem related information gathering.
! 1250: */
! 1251: int
! 1252: vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
! 1253: size_t newlen, struct proc *p)
! 1254: {
! 1255: struct vfsconf *vfsp, *tmpvfsp;
! 1256: int ret;
! 1257:
! 1258: /* all sysctl names at this level are at least name and field */
! 1259: if (namelen < 2)
! 1260: return (ENOTDIR); /* overloaded */
! 1261:
! 1262: if (name[0] != VFS_GENERIC) {
! 1263: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
! 1264: if (vfsp->vfc_typenum == name[0])
! 1265: break;
! 1266:
! 1267: if (vfsp == NULL)
! 1268: return (EOPNOTSUPP);
! 1269:
! 1270: return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
! 1271: oldp, oldlenp, newp, newlen, p));
! 1272: }
! 1273:
! 1274: switch (name[1]) {
! 1275: case VFS_MAXTYPENUM:
! 1276: return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
! 1277:
! 1278: case VFS_CONF:
! 1279: if (namelen < 3)
! 1280: return (ENOTDIR); /* overloaded */
! 1281:
! 1282: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
! 1283: if (vfsp->vfc_typenum == name[2])
! 1284: break;
! 1285:
! 1286: if (vfsp == NULL)
! 1287: return (EOPNOTSUPP);
! 1288:
! 1289: /* Make a copy, clear out kernel pointers */
! 1290: tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK);
! 1291: bcopy(vfsp, tmpvfsp, sizeof(*tmpvfsp));
! 1292: tmpvfsp->vfc_vfsops = NULL;
! 1293: tmpvfsp->vfc_mountroot = NULL;
! 1294: tmpvfsp->vfc_next = NULL;
! 1295:
! 1296: ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp,
! 1297: sizeof(struct vfsconf));
! 1298:
! 1299: free(tmpvfsp, M_TEMP);
! 1300: return (ret);
! 1301: }
! 1302:
! 1303: return (EOPNOTSUPP);
! 1304: }
! 1305:
! 1306: int kinfo_vdebug = 1;
! 1307: #define KINFO_VNODESLOP 10
! 1308: /*
! 1309: * Dump vnode list (via sysctl).
! 1310: * Copyout address of vnode followed by vnode.
! 1311: */
! 1312: /* ARGSUSED */
! 1313: int
! 1314: sysctl_vnode(char *where, size_t *sizep, struct proc *p)
! 1315: {
! 1316: struct mount *mp, *nmp;
! 1317: struct vnode *vp, *nvp;
! 1318: char *bp = where, *savebp;
! 1319: char *ewhere;
! 1320: int error;
! 1321:
! 1322: if (where == NULL) {
! 1323: *sizep = (numvnodes + KINFO_VNODESLOP) * sizeof(struct e_vnode);
! 1324: return (0);
! 1325: }
! 1326: ewhere = where + *sizep;
! 1327:
! 1328: for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
! 1329: mp = nmp) {
! 1330: if (vfs_busy(mp, VB_READ|VB_NOWAIT)) {
! 1331: nmp = CIRCLEQ_NEXT(mp, mnt_list);
! 1332: continue;
! 1333: }
! 1334: savebp = bp;
! 1335: again:
! 1336: for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL;
! 1337: vp = nvp) {
! 1338: /*
! 1339: * Check that the vp is still associated with
! 1340: * this filesystem. RACE: could have been
! 1341: * recycled onto the same filesystem.
! 1342: */
! 1343: if (vp->v_mount != mp) {
! 1344: if (kinfo_vdebug)
! 1345: printf("kinfo: vp changed\n");
! 1346: bp = savebp;
! 1347: goto again;
! 1348: }
! 1349: nvp = LIST_NEXT(vp, v_mntvnodes);
! 1350: if (bp + sizeof(struct e_vnode) > ewhere) {
! 1351: *sizep = bp - where;
! 1352: vfs_unbusy(mp);
! 1353: return (ENOMEM);
! 1354: }
! 1355: if ((error = copyout(&vp,
! 1356: &((struct e_vnode *)bp)->vptr,
! 1357: sizeof(struct vnode *))) ||
! 1358: (error = copyout(vp,
! 1359: &((struct e_vnode *)bp)->vnode,
! 1360: sizeof(struct vnode)))) {
! 1361: vfs_unbusy(mp);
! 1362: return (error);
! 1363: }
! 1364: bp += sizeof(struct e_vnode);
! 1365: }
! 1366:
! 1367: nmp = CIRCLEQ_NEXT(mp, mnt_list);
! 1368: vfs_unbusy(mp);
! 1369: }
! 1370:
! 1371: *sizep = bp - where;
! 1372:
! 1373: return (0);
! 1374: }
! 1375:
! 1376: /*
! 1377: * Check to see if a filesystem is mounted on a block device.
! 1378: */
! 1379: int
! 1380: vfs_mountedon(struct vnode *vp)
! 1381: {
! 1382: struct vnode *vq;
! 1383: int error = 0;
! 1384:
! 1385: if (vp->v_specmountpoint != NULL)
! 1386: return (EBUSY);
! 1387: if (vp->v_flag & VALIASED) {
! 1388: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
! 1389: if (vq->v_rdev != vp->v_rdev ||
! 1390: vq->v_type != vp->v_type)
! 1391: continue;
! 1392: if (vq->v_specmountpoint != NULL) {
! 1393: error = EBUSY;
! 1394: break;
! 1395: }
! 1396: }
! 1397: }
! 1398: return (error);
! 1399: }
! 1400:
! 1401: /*
! 1402: * Build hash lists of net addresses and hang them off the mount point.
! 1403: * Called by ufs_mount() to set up the lists of export addresses.
! 1404: */
! 1405: int
! 1406: vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
! 1407: struct export_args *argp)
! 1408: {
! 1409: struct netcred *np;
! 1410: struct radix_node_head *rnh;
! 1411: int i;
! 1412: struct radix_node *rn;
! 1413: struct sockaddr *saddr, *smask = 0;
! 1414: struct domain *dom;
! 1415: int error;
! 1416:
! 1417: if (argp->ex_addrlen == 0) {
! 1418: if (mp->mnt_flag & MNT_DEFEXPORTED)
! 1419: return (EPERM);
! 1420: np = &nep->ne_defexported;
! 1421: np->netc_exflags = argp->ex_flags;
! 1422: np->netc_anon = argp->ex_anon;
! 1423: np->netc_anon.cr_ref = 1;
! 1424: mp->mnt_flag |= MNT_DEFEXPORTED;
! 1425: return (0);
! 1426: }
! 1427: if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN ||
! 1428: argp->ex_addrlen < 0 || argp->ex_masklen < 0)
! 1429: return (EINVAL);
! 1430: i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
! 1431: np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK);
! 1432: bzero(np, i);
! 1433: saddr = (struct sockaddr *)(np + 1);
! 1434: error = copyin(argp->ex_addr, saddr, argp->ex_addrlen);
! 1435: if (error)
! 1436: goto out;
! 1437: if (saddr->sa_len > argp->ex_addrlen)
! 1438: saddr->sa_len = argp->ex_addrlen;
! 1439: if (argp->ex_masklen) {
! 1440: smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
! 1441: error = copyin(argp->ex_mask, smask, argp->ex_masklen);
! 1442: if (error)
! 1443: goto out;
! 1444: if (smask->sa_len > argp->ex_masklen)
! 1445: smask->sa_len = argp->ex_masklen;
! 1446: }
! 1447: i = saddr->sa_family;
! 1448: if (i < 0 || i > AF_MAX) {
! 1449: error = EINVAL;
! 1450: goto out;
! 1451: }
! 1452: if ((rnh = nep->ne_rtable[i]) == 0) {
! 1453: /*
! 1454: * Seems silly to initialize every AF when most are not
! 1455: * used, do so on demand here
! 1456: */
! 1457: for (dom = domains; dom; dom = dom->dom_next)
! 1458: if (dom->dom_family == i && dom->dom_rtattach) {
! 1459: dom->dom_rtattach((void **)&nep->ne_rtable[i],
! 1460: dom->dom_rtoffset);
! 1461: break;
! 1462: }
! 1463: if ((rnh = nep->ne_rtable[i]) == 0) {
! 1464: error = ENOBUFS;
! 1465: goto out;
! 1466: }
! 1467: }
! 1468: rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh,
! 1469: np->netc_rnodes);
! 1470: if (rn == 0 || np != (struct netcred *)rn) { /* already exists */
! 1471: error = EPERM;
! 1472: goto out;
! 1473: }
! 1474: np->netc_exflags = argp->ex_flags;
! 1475: np->netc_anon = argp->ex_anon;
! 1476: np->netc_anon.cr_ref = 1;
! 1477: return (0);
! 1478: out:
! 1479: free(np, M_NETADDR);
! 1480: return (error);
! 1481: }
! 1482:
! 1483: /* ARGSUSED */
! 1484: int
! 1485: vfs_free_netcred(struct radix_node *rn, void *w)
! 1486: {
! 1487: struct radix_node_head *rnh = (struct radix_node_head *)w;
! 1488:
! 1489: (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh, NULL);
! 1490: free(rn, M_NETADDR);
! 1491: return (0);
! 1492: }
! 1493:
! 1494: /*
! 1495: * Free the net address hash lists that are hanging off the mount points.
! 1496: */
! 1497: void
! 1498: vfs_free_addrlist(struct netexport *nep)
! 1499: {
! 1500: int i;
! 1501: struct radix_node_head *rnh;
! 1502:
! 1503: for (i = 0; i <= AF_MAX; i++)
! 1504: if ((rnh = nep->ne_rtable[i]) != NULL) {
! 1505: (*rnh->rnh_walktree)(rnh, vfs_free_netcred, rnh);
! 1506: free(rnh, M_RTABLE);
! 1507: nep->ne_rtable[i] = 0;
! 1508: }
! 1509: }
! 1510:
! 1511: int
! 1512: vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp)
! 1513: {
! 1514: int error;
! 1515:
! 1516: if (argp->ex_flags & MNT_DELEXPORT) {
! 1517: vfs_free_addrlist(nep);
! 1518: mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
! 1519: }
! 1520: if (argp->ex_flags & MNT_EXPORTED) {
! 1521: if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0)
! 1522: return (error);
! 1523: mp->mnt_flag |= MNT_EXPORTED;
! 1524: }
! 1525: return (0);
! 1526: }
! 1527:
! 1528: struct netcred *
! 1529: vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam)
! 1530: {
! 1531: struct netcred *np;
! 1532: struct radix_node_head *rnh;
! 1533: struct sockaddr *saddr;
! 1534:
! 1535: np = NULL;
! 1536: if (mp->mnt_flag & MNT_EXPORTED) {
! 1537: /*
! 1538: * Lookup in the export list first.
! 1539: */
! 1540: if (nam != NULL) {
! 1541: saddr = mtod(nam, struct sockaddr *);
! 1542: rnh = nep->ne_rtable[saddr->sa_family];
! 1543: if (rnh != NULL) {
! 1544: np = (struct netcred *)
! 1545: (*rnh->rnh_matchaddr)((caddr_t)saddr,
! 1546: rnh);
! 1547: if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
! 1548: np = NULL;
! 1549: }
! 1550: }
! 1551: /*
! 1552: * If no address match, use the default if it exists.
! 1553: */
! 1554: if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
! 1555: np = &nep->ne_defexported;
! 1556: }
! 1557: return (np);
! 1558: }
! 1559:
! 1560: /*
! 1561: * Do the usual access checking.
! 1562: * file_mode, uid and gid are from the vnode in question,
! 1563: * while acc_mode and cred are from the VOP_ACCESS parameter list
! 1564: */
! 1565: int
! 1566: vaccess(mode_t file_mode, uid_t uid, gid_t gid, mode_t acc_mode,
! 1567: struct ucred *cred)
! 1568: {
! 1569: mode_t mask;
! 1570:
! 1571: /* User id 0 always gets access. */
! 1572: if (cred->cr_uid == 0)
! 1573: return 0;
! 1574:
! 1575: mask = 0;
! 1576:
! 1577: /* Otherwise, check the owner. */
! 1578: if (cred->cr_uid == uid) {
! 1579: if (acc_mode & VEXEC)
! 1580: mask |= S_IXUSR;
! 1581: if (acc_mode & VREAD)
! 1582: mask |= S_IRUSR;
! 1583: if (acc_mode & VWRITE)
! 1584: mask |= S_IWUSR;
! 1585: return (file_mode & mask) == mask ? 0 : EACCES;
! 1586: }
! 1587:
! 1588: /* Otherwise, check the groups. */
! 1589: if (cred->cr_gid == gid || groupmember(gid, cred)) {
! 1590: if (acc_mode & VEXEC)
! 1591: mask |= S_IXGRP;
! 1592: if (acc_mode & VREAD)
! 1593: mask |= S_IRGRP;
! 1594: if (acc_mode & VWRITE)
! 1595: mask |= S_IWGRP;
! 1596: return (file_mode & mask) == mask ? 0 : EACCES;
! 1597: }
! 1598:
! 1599: /* Otherwise, check everyone else. */
! 1600: if (acc_mode & VEXEC)
! 1601: mask |= S_IXOTH;
! 1602: if (acc_mode & VREAD)
! 1603: mask |= S_IROTH;
! 1604: if (acc_mode & VWRITE)
! 1605: mask |= S_IWOTH;
! 1606: return (file_mode & mask) == mask ? 0 : EACCES;
! 1607: }
! 1608:
! 1609: /*
! 1610: * Unmount all file systems.
! 1611: * We traverse the list in reverse order under the assumption that doing so
! 1612: * will avoid needing to worry about dependencies.
! 1613: */
! 1614: void
! 1615: vfs_unmountall(void)
! 1616: {
! 1617: struct mount *mp, *nmp;
! 1618: int allerror, error, again = 1;
! 1619:
! 1620: retry:
! 1621: allerror = 0;
! 1622: for (mp = CIRCLEQ_LAST(&mountlist); mp != CIRCLEQ_END(&mountlist);
! 1623: mp = nmp) {
! 1624: nmp = CIRCLEQ_PREV(mp, mnt_list);
! 1625: if ((vfs_busy(mp, VB_WRITE|VB_NOWAIT)) != 0)
! 1626: continue;
! 1627: if ((error = dounmount(mp, MNT_FORCE, curproc, NULL)) != 0) {
! 1628: printf("unmount of %s failed with error %d\n",
! 1629: mp->mnt_stat.f_mntonname, error);
! 1630: allerror = 1;
! 1631: }
! 1632: }
! 1633:
! 1634: if (allerror) {
! 1635: printf("WARNING: some file systems would not unmount\n");
! 1636: if (again) {
! 1637: printf("retrying\n");
! 1638: again = 0;
! 1639: goto retry;
! 1640: }
! 1641: }
! 1642: }
! 1643:
! 1644: /*
! 1645: * Sync and unmount file systems before shutting down.
! 1646: */
! 1647: void
! 1648: vfs_shutdown(void)
! 1649: {
! 1650: #ifdef ACCOUNTING
! 1651: extern void acct_shutdown(void);
! 1652:
! 1653: acct_shutdown();
! 1654: #endif
! 1655:
! 1656: /* XXX Should suspend scheduling. */
! 1657: (void) spl0();
! 1658:
! 1659: printf("syncing disks... ");
! 1660:
! 1661: if (panicstr == 0) {
! 1662: /* Sync before unmount, in case we hang on something. */
! 1663: sys_sync(&proc0, (void *)0, (register_t *)0);
! 1664:
! 1665: /* Unmount file systems. */
! 1666: vfs_unmountall();
! 1667: }
! 1668:
! 1669: if (vfs_syncwait(1))
! 1670: printf("giving up\n");
! 1671: else
! 1672: printf("done\n");
! 1673: }
! 1674:
! 1675: /*
! 1676: * perform sync() operation and wait for buffers to flush.
! 1677: * assumtions: called w/ scheduler disabled and physical io enabled
! 1678: * for now called at spl0() XXX
! 1679: */
! 1680: int
! 1681: vfs_syncwait(int verbose)
! 1682: {
! 1683: struct buf *bp;
! 1684: int iter, nbusy, dcount, s;
! 1685: struct proc *p;
! 1686:
! 1687: p = curproc? curproc : &proc0;
! 1688: sys_sync(p, (void *)0, (register_t *)0);
! 1689:
! 1690: /* Wait for sync to finish. */
! 1691: dcount = 10000;
! 1692: for (iter = 0; iter < 20; iter++) {
! 1693: nbusy = 0;
! 1694: LIST_FOREACH(bp, &bufhead, b_list) {
! 1695: if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY)
! 1696: nbusy++;
! 1697: /*
! 1698: * With soft updates, some buffers that are
! 1699: * written will be remarked as dirty until other
! 1700: * buffers are written.
! 1701: */
! 1702: if (bp->b_flags & B_DELWRI) {
! 1703: s = splbio();
! 1704: bremfree(bp);
! 1705: bp->b_flags |= B_BUSY;
! 1706: splx(s);
! 1707: nbusy++;
! 1708: bawrite(bp);
! 1709: if (dcount-- <= 0) {
! 1710: if (verbose)
! 1711: printf("softdep ");
! 1712: return 1;
! 1713: }
! 1714: }
! 1715: }
! 1716: if (nbusy == 0)
! 1717: break;
! 1718: if (verbose)
! 1719: printf("%d ", nbusy);
! 1720: DELAY(40000 * iter);
! 1721: }
! 1722:
! 1723: return nbusy;
! 1724: }
! 1725:
! 1726: /*
! 1727: * posix file system related system variables.
! 1728: */
! 1729: int
! 1730: fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
! 1731: void *newp, size_t newlen, struct proc *p)
! 1732: {
! 1733: /* all sysctl names at this level are terminal */
! 1734: if (namelen != 1)
! 1735: return (ENOTDIR);
! 1736:
! 1737: switch (name[0]) {
! 1738: case FS_POSIX_SETUID:
! 1739: if (newp && securelevel > 0)
! 1740: return (EPERM);
! 1741: return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear));
! 1742: default:
! 1743: return (EOPNOTSUPP);
! 1744: }
! 1745: /* NOTREACHED */
! 1746: }
! 1747:
! 1748: /*
! 1749: * file system related system variables.
! 1750: */
! 1751: int
! 1752: fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
! 1753: size_t newlen, struct proc *p)
! 1754: {
! 1755: sysctlfn *fn;
! 1756:
! 1757: switch (name[0]) {
! 1758: case FS_POSIX:
! 1759: fn = fs_posix_sysctl;
! 1760: break;
! 1761: default:
! 1762: return (EOPNOTSUPP);
! 1763: }
! 1764: return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p);
! 1765: }
! 1766:
! 1767:
! 1768: /*
! 1769: * Routines dealing with vnodes and buffers
! 1770: */
! 1771:
! 1772: /*
! 1773: * Wait for all outstanding I/Os to complete
! 1774: *
! 1775: * Manipulates v_numoutput. Must be called at splbio()
! 1776: */
! 1777: int
! 1778: vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo)
! 1779: {
! 1780: int error = 0;
! 1781:
! 1782: splassert(IPL_BIO);
! 1783:
! 1784: while (vp->v_numoutput) {
! 1785: vp->v_bioflag |= VBIOWAIT;
! 1786: error = tsleep(&vp->v_numoutput,
! 1787: slpflag | (PRIBIO + 1), wmesg, timeo);
! 1788: if (error)
! 1789: break;
! 1790: }
! 1791:
! 1792: return (error);
! 1793: }
! 1794:
! 1795: /*
! 1796: * Update outstanding I/O count and do wakeup if requested.
! 1797: *
! 1798: * Manipulates v_numoutput. Must be called at splbio()
! 1799: */
! 1800: void
! 1801: vwakeup(struct vnode *vp)
! 1802: {
! 1803: splassert(IPL_BIO);
! 1804:
! 1805: if (vp != NULL) {
! 1806: if (vp->v_numoutput-- == 0)
! 1807: panic("vwakeup: neg numoutput");
! 1808: if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) {
! 1809: vp->v_bioflag &= ~VBIOWAIT;
! 1810: wakeup(&vp->v_numoutput);
! 1811: }
! 1812: }
! 1813: }
! 1814:
! 1815: /*
! 1816: * Flush out and invalidate all buffers associated with a vnode.
! 1817: * Called with the underlying object locked.
! 1818: */
! 1819: int
! 1820: vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p,
! 1821: int slpflag, int slptimeo)
! 1822: {
! 1823: struct buf *bp;
! 1824: struct buf *nbp, *blist;
! 1825: int s, error;
! 1826:
! 1827: #ifdef VFSDEBUG
! 1828: if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp))
! 1829: panic("vinvalbuf(): vp isn't locked");
! 1830: #endif
! 1831:
! 1832: if (flags & V_SAVE) {
! 1833: s = splbio();
! 1834: vwaitforio(vp, 0, "vinvalbuf", 0);
! 1835: if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
! 1836: splx(s);
! 1837: if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0)
! 1838: return (error);
! 1839: s = splbio();
! 1840: if (vp->v_numoutput > 0 ||
! 1841: !LIST_EMPTY(&vp->v_dirtyblkhd))
! 1842: panic("vinvalbuf: dirty bufs");
! 1843: }
! 1844: splx(s);
! 1845: }
! 1846: loop:
! 1847: s = splbio();
! 1848: for (;;) {
! 1849: if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) &&
! 1850: (flags & V_SAVEMETA))
! 1851: while (blist && blist->b_lblkno < 0)
! 1852: blist = LIST_NEXT(blist, b_vnbufs);
! 1853: if (blist == NULL &&
! 1854: (blist = LIST_FIRST(&vp->v_dirtyblkhd)) &&
! 1855: (flags & V_SAVEMETA))
! 1856: while (blist && blist->b_lblkno < 0)
! 1857: blist = LIST_NEXT(blist, b_vnbufs);
! 1858: if (!blist)
! 1859: break;
! 1860:
! 1861: for (bp = blist; bp; bp = nbp) {
! 1862: nbp = LIST_NEXT(bp, b_vnbufs);
! 1863: if (flags & V_SAVEMETA && bp->b_lblkno < 0)
! 1864: continue;
! 1865: if (bp->b_flags & B_BUSY) {
! 1866: bp->b_flags |= B_WANTED;
! 1867: error = tsleep(bp, slpflag | (PRIBIO + 1),
! 1868: "vinvalbuf", slptimeo);
! 1869: if (error) {
! 1870: splx(s);
! 1871: return (error);
! 1872: }
! 1873: break;
! 1874: }
! 1875: bremfree(bp);
! 1876: bp->b_flags |= B_BUSY;
! 1877: /*
! 1878: * XXX Since there are no node locks for NFS, I believe
! 1879: * there is a slight chance that a delayed write will
! 1880: * occur while sleeping just above, so check for it.
! 1881: */
! 1882: if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) {
! 1883: splx(s);
! 1884: (void) VOP_BWRITE(bp);
! 1885: goto loop;
! 1886: }
! 1887: bp->b_flags |= B_INVAL;
! 1888: brelse(bp);
! 1889: }
! 1890: }
! 1891: if (!(flags & V_SAVEMETA) &&
! 1892: (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd)))
! 1893: panic("vinvalbuf: flush failed");
! 1894: splx(s);
! 1895: return (0);
! 1896: }
! 1897:
! 1898: void
! 1899: vflushbuf(struct vnode *vp, int sync)
! 1900: {
! 1901: struct buf *bp, *nbp;
! 1902: int s;
! 1903:
! 1904: loop:
! 1905: s = splbio();
! 1906: for (bp = LIST_FIRST(&vp->v_dirtyblkhd);
! 1907: bp != LIST_END(&vp->v_dirtyblkhd); bp = nbp) {
! 1908: nbp = LIST_NEXT(bp, b_vnbufs);
! 1909: if ((bp->b_flags & B_BUSY))
! 1910: continue;
! 1911: if ((bp->b_flags & B_DELWRI) == 0)
! 1912: panic("vflushbuf: not dirty");
! 1913: bremfree(bp);
! 1914: bp->b_flags |= B_BUSY;
! 1915: splx(s);
! 1916: /*
! 1917: * Wait for I/O associated with indirect blocks to complete,
! 1918: * since there is no way to quickly wait for them below.
! 1919: */
! 1920: if (bp->b_vp == vp || sync == 0)
! 1921: (void) bawrite(bp);
! 1922: else
! 1923: (void) bwrite(bp);
! 1924: goto loop;
! 1925: }
! 1926: if (sync == 0) {
! 1927: splx(s);
! 1928: return;
! 1929: }
! 1930: vwaitforio(vp, 0, "vflushbuf", 0);
! 1931: if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
! 1932: splx(s);
! 1933: #ifdef DIAGNOSTIC
! 1934: vprint("vflushbuf: dirty", vp);
! 1935: #endif
! 1936: goto loop;
! 1937: }
! 1938: splx(s);
! 1939: }
! 1940:
! 1941: /*
! 1942: * Associate a buffer with a vnode.
! 1943: *
! 1944: * Manipulates buffer vnode queues. Must be called at splbio().
! 1945: */
! 1946: void
! 1947: bgetvp(struct vnode *vp, struct buf *bp)
! 1948: {
! 1949: splassert(IPL_BIO);
! 1950:
! 1951:
! 1952: if (bp->b_vp)
! 1953: panic("bgetvp: not free");
! 1954: vhold(vp);
! 1955: bp->b_vp = vp;
! 1956: if (vp->v_type == VBLK || vp->v_type == VCHR)
! 1957: bp->b_dev = vp->v_rdev;
! 1958: else
! 1959: bp->b_dev = NODEV;
! 1960: /*
! 1961: * Insert onto list for new vnode.
! 1962: */
! 1963: bufinsvn(bp, &vp->v_cleanblkhd);
! 1964: }
! 1965:
! 1966: /*
! 1967: * Disassociate a buffer from a vnode.
! 1968: *
! 1969: * Manipulates vnode buffer queues. Must be called at splbio().
! 1970: */
! 1971: void
! 1972: brelvp(struct buf *bp)
! 1973: {
! 1974: struct vnode *vp;
! 1975:
! 1976: splassert(IPL_BIO);
! 1977:
! 1978: if ((vp = bp->b_vp) == (struct vnode *) 0)
! 1979: panic("brelvp: NULL");
! 1980: /*
! 1981: * Delete from old vnode list, if on one.
! 1982: */
! 1983: if (LIST_NEXT(bp, b_vnbufs) != NOLIST)
! 1984: bufremvn(bp);
! 1985: if ((vp->v_bioflag & VBIOONSYNCLIST) &&
! 1986: LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
! 1987: vp->v_bioflag &= ~VBIOONSYNCLIST;
! 1988: LIST_REMOVE(vp, v_synclist);
! 1989: }
! 1990: bp->b_vp = (struct vnode *) 0;
! 1991:
! 1992: #ifdef DIAGNOSTIC
! 1993: if (vp->v_holdcnt == 0)
! 1994: panic("brelvp: holdcnt");
! 1995: #endif
! 1996: vp->v_holdcnt--;
! 1997:
! 1998: /*
! 1999: * If it is on the holdlist and the hold count drops to
! 2000: * zero, move it to the free list.
! 2001: */
! 2002: if ((vp->v_bioflag & VBIOONFREELIST) &&
! 2003: vp->v_holdcnt == 0 && vp->v_usecount == 0) {
! 2004: TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
! 2005: TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
! 2006: }
! 2007: }
! 2008:
! 2009: /*
! 2010: * Replaces the current vnode associated with the buffer, if any,
! 2011: * with a new vnode.
! 2012: *
! 2013: * If an output I/O is pending on the buffer, the old vnode
! 2014: * I/O count is adjusted.
! 2015: *
! 2016: * Ignores vnode buffer queues. Must be called at splbio().
! 2017: */
! 2018: void
! 2019: buf_replacevnode(struct buf *bp, struct vnode *newvp)
! 2020: {
! 2021: struct vnode *oldvp = bp->b_vp;
! 2022:
! 2023: splassert(IPL_BIO);
! 2024:
! 2025: if (oldvp)
! 2026: brelvp(bp);
! 2027:
! 2028: if ((bp->b_flags & (B_READ | B_DONE)) == 0) {
! 2029: newvp->v_numoutput++; /* put it on swapdev */
! 2030: vwakeup(oldvp);
! 2031: }
! 2032:
! 2033: bgetvp(newvp, bp);
! 2034: bufremvn(bp);
! 2035: }
! 2036:
! 2037: /*
! 2038: * Used to assign buffers to the appropriate clean or dirty list on
! 2039: * the vnode and to add newly dirty vnodes to the appropriate
! 2040: * filesystem syncer list.
! 2041: *
! 2042: * Manipulates vnode buffer queues. Must be called at splbio().
! 2043: */
! 2044: void
! 2045: reassignbuf(struct buf *bp)
! 2046: {
! 2047: struct buflists *listheadp;
! 2048: int delay;
! 2049: struct vnode *vp = bp->b_vp;
! 2050:
! 2051: splassert(IPL_BIO);
! 2052:
! 2053: /*
! 2054: * Delete from old vnode list, if on one.
! 2055: */
! 2056: if (LIST_NEXT(bp, b_vnbufs) != NOLIST)
! 2057: bufremvn(bp);
! 2058:
! 2059: /*
! 2060: * If dirty, put on list of dirty buffers;
! 2061: * otherwise insert onto list of clean buffers.
! 2062: */
! 2063: if ((bp->b_flags & B_DELWRI) == 0) {
! 2064: listheadp = &vp->v_cleanblkhd;
! 2065: if ((vp->v_bioflag & VBIOONSYNCLIST) &&
! 2066: LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
! 2067: vp->v_bioflag &= ~VBIOONSYNCLIST;
! 2068: LIST_REMOVE(vp, v_synclist);
! 2069: }
! 2070: } else {
! 2071: listheadp = &vp->v_dirtyblkhd;
! 2072: if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) {
! 2073: switch (vp->v_type) {
! 2074: case VDIR:
! 2075: delay = syncdelay / 2;
! 2076: break;
! 2077: case VBLK:
! 2078: if (vp->v_specmountpoint != NULL) {
! 2079: delay = syncdelay / 3;
! 2080: break;
! 2081: }
! 2082: /* FALLTHROUGH */
! 2083: default:
! 2084: delay = syncdelay;
! 2085: }
! 2086: vn_syncer_add_to_worklist(vp, delay);
! 2087: }
! 2088: }
! 2089: bufinsvn(bp, listheadp);
! 2090: }
! 2091:
! 2092: int
! 2093: vfs_register(struct vfsconf *vfs)
! 2094: {
! 2095: struct vfsconf *vfsp;
! 2096: struct vfsconf **vfspp;
! 2097:
! 2098: #ifdef DIAGNOSTIC
! 2099: /* Paranoia? */
! 2100: if (vfs->vfc_refcount != 0)
! 2101: printf("vfs_register called with vfc_refcount > 0\n");
! 2102: #endif
! 2103:
! 2104: /* Check if filesystem already known */
! 2105: for (vfspp = &vfsconf, vfsp = vfsconf; vfsp;
! 2106: vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next)
! 2107: if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
! 2108: return (EEXIST);
! 2109:
! 2110: if (vfs->vfc_typenum > maxvfsconf)
! 2111: maxvfsconf = vfs->vfc_typenum;
! 2112:
! 2113: vfs->vfc_next = NULL;
! 2114:
! 2115: /* Add to the end of the list */
! 2116: *vfspp = vfs;
! 2117:
! 2118: /* Call vfs_init() */
! 2119: if (vfs->vfc_vfsops->vfs_init)
! 2120: (*(vfs->vfc_vfsops->vfs_init))(vfs);
! 2121:
! 2122: return 0;
! 2123: }
! 2124:
! 2125: int
! 2126: vfs_unregister(struct vfsconf *vfs)
! 2127: {
! 2128: struct vfsconf *vfsp;
! 2129: struct vfsconf **vfspp;
! 2130: int maxtypenum;
! 2131:
! 2132: /* Find our vfsconf struct */
! 2133: for (vfspp = &vfsconf, vfsp = vfsconf; vfsp;
! 2134: vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) {
! 2135: if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
! 2136: break;
! 2137: }
! 2138:
! 2139: if (!vfsp) /* Not found */
! 2140: return (ENOENT);
! 2141:
! 2142: if (vfsp->vfc_refcount) /* In use */
! 2143: return (EBUSY);
! 2144:
! 2145: /* Remove from list and free */
! 2146: *vfspp = vfsp->vfc_next;
! 2147:
! 2148: maxtypenum = 0;
! 2149:
! 2150: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
! 2151: if (vfsp->vfc_typenum > maxtypenum)
! 2152: maxtypenum = vfsp->vfc_typenum;
! 2153:
! 2154: maxvfsconf = maxtypenum;
! 2155: return 0;
! 2156: }
! 2157:
! 2158: /*
! 2159: * Check if vnode represents a disk device
! 2160: */
! 2161: int
! 2162: vn_isdisk(struct vnode *vp, int *errp)
! 2163: {
! 2164: if (vp->v_type != VBLK && vp->v_type != VCHR)
! 2165: return (0);
! 2166:
! 2167: return (1);
! 2168: }
! 2169:
! 2170: #ifdef DDB
! 2171: #include <machine/db_machdep.h>
! 2172: #include <ddb/db_interface.h>
! 2173: #include <ddb/db_output.h>
! 2174:
! 2175: void
! 2176: vfs_buf_print(struct buf *bp, int full, int (*pr)(const char *, ...))
! 2177: {
! 2178:
! 2179: (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n"
! 2180: " proc %p error %d flags %b\n",
! 2181: bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev,
! 2182: bp->b_proc, bp->b_error, bp->b_flags, B_BITS);
! 2183:
! 2184: (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx sync 0x%x\n"
! 2185: " data %p saveaddr %p dep %p iodone %p\n",
! 2186: bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, bp->b_synctime,
! 2187: bp->b_data, bp->b_saveaddr, LIST_FIRST(&bp->b_dep), bp->b_iodone);
! 2188:
! 2189: (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n",
! 2190: bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend);
! 2191:
! 2192: #ifdef FFS_SOFTUPDATES
! 2193: if (full)
! 2194: softdep_print(bp, full, pr);
! 2195: #endif
! 2196: }
! 2197:
! 2198: const char *vtypes[] = { VTYPE_NAMES };
! 2199: const char *vtags[] = { VTAG_NAMES };
! 2200:
! 2201: void
! 2202: vfs_vnode_print(struct vnode *vp, int full, int (*pr)(const char *, ...))
! 2203: {
! 2204:
! 2205: #define NENTS(n) (sizeof n / sizeof(n[0]))
! 2206: (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n",
! 2207: vp->v_tag > NENTS(vtags)? "<unk>":vtags[vp->v_tag], vp->v_tag,
! 2208: vp->v_type > NENTS(vtypes)? "<unk>":vtypes[vp->v_type],
! 2209: vp->v_type, vp->v_mount, vp->v_mountedhere);
! 2210:
! 2211: (*pr)("data %p usecount %d writecount %ld holdcnt %ld numoutput %d\n",
! 2212: vp->v_data, vp->v_usecount, vp->v_writecount,
! 2213: vp->v_holdcnt, vp->v_numoutput);
! 2214:
! 2215: /* uvm_object_printit(&vp->v_uobj, full, pr); */
! 2216:
! 2217: if (full) {
! 2218: struct buf *bp;
! 2219:
! 2220: (*pr)("clean bufs:\n");
! 2221: LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) {
! 2222: (*pr)(" bp %p\n", bp);
! 2223: vfs_buf_print(bp, full, pr);
! 2224: }
! 2225:
! 2226: (*pr)("dirty bufs:\n");
! 2227: LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) {
! 2228: (*pr)(" bp %p\n", bp);
! 2229: vfs_buf_print(bp, full, pr);
! 2230: }
! 2231: }
! 2232: }
! 2233:
! 2234: void
! 2235: vfs_mount_print(struct mount *mp, int full, int (*pr)(const char *, ...))
! 2236: {
! 2237: struct vfsconf *vfc = mp->mnt_vfc;
! 2238: struct vnode *vp;
! 2239: int cnt = 0;
! 2240:
! 2241: (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n",
! 2242: mp->mnt_flag, MNT_BITS,
! 2243: mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data);
! 2244:
! 2245: (*pr)("vfsconf: ops %p name \"%s\" num %d ref %d flags 0x%x\n",
! 2246: vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum,
! 2247: vfc->vfc_refcount, vfc->vfc_flags);
! 2248:
! 2249: (*pr)("statvfs cache: bsize %x iosize %x\nblocks %u free %u avail %u\n",
! 2250: mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks,
! 2251: mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail);
! 2252:
! 2253: (*pr)(" files %u ffiles %u\n", mp->mnt_stat.f_files,
! 2254: mp->mnt_stat.f_ffree);
! 2255:
! 2256: (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%x\n",
! 2257: mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1],
! 2258: mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime);
! 2259:
! 2260: (*pr)(" syncwrites %lu asyncwrites = %lu\n",
! 2261: mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites);
! 2262:
! 2263: (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\"\n",
! 2264: mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname,
! 2265: mp->mnt_stat.f_mntfromname);
! 2266:
! 2267: (*pr)("locked vnodes:");
! 2268: /* XXX would take mountlist lock, except ddb has no context */
! 2269: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
! 2270: if (VOP_ISLOCKED(vp)) {
! 2271: if (!LIST_NEXT(vp, v_mntvnodes))
! 2272: (*pr)(" %p", vp);
! 2273: else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4))))
! 2274: (*pr)("\n\t%p", vp);
! 2275: else
! 2276: (*pr)(", %p", vp);
! 2277: }
! 2278: (*pr)("\n");
! 2279:
! 2280: if (full) {
! 2281: (*pr)("all vnodes:\n\t");
! 2282: /* XXX would take mountlist lock, except ddb has no context */
! 2283: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
! 2284: if (!LIST_NEXT(vp, v_mntvnodes))
! 2285: (*pr)(" %p", vp);
! 2286: else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4))))
! 2287: (*pr)(" %p,\n\t", vp);
! 2288: else
! 2289: (*pr)(" %p,", vp);
! 2290: (*pr)("\n", vp);
! 2291: }
! 2292: }
! 2293: #endif /* DDB */
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