xnu-124.7.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_vfsops.c

/*
 * Copyright (c) 1999-2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      hfs_vfsops.c
 *  derived from        @(#)ufs_vfsops.c        8.8 (Berkeley) 5/20/95
 *
 *      (c) Copyright 1997-1998 Apple Computer, Inc. All rights reserved.
 *
 *      hfs_vfsops.c -- VFS layer for loadable HFS file system.
 *
 *      HISTORY
 *       9-Nov-1999     Don Brady       Fix error handling in hfs_unmount [2399157].
 *       9-Sep-1999     Don Brady       Clear system file fcbModified flags in hfs_flushvolumeheader/hfs_flushMDB.
 *       5-Aug-1999     Pat Dirks       Moved special HFS flag from f_fsid.val[0][0] to mount flags (#2293117).
 *      23-Jul-1999     Pat Dirks       Added special-case code for root's parent directory in hfs_vget (#2263664).
 *       9-Jun-1999     Don Brady       Fix hfs_mount for reload and read-only downgrade cases.
 *       2-Jun-1999     Don Brady       Fix hfs_statfs to return correct f_files value.
 *       4-May-1999     Don Brady       Remove obsolete loadable module code.
 *      22-Mar-1999     Don Brady       Hide our private meta data in hfs_vget.
 *              18-May-1999     Don Brady       Add hfs_mountroot for HFS Plus rooting.
 *              22-Mar-1999     Don Brady       Hide our private meta data in hfs_vget.
 *              12-Nov-1998     Pat Dirks       Changed hfs_statfs to return volume's actual log. block size (#2286198).
 *              22-Aug-1998     Scott Roberts   Assign uid,gid, and mask for default on objects.
 *              29-Jul-1998     Pat Dirks               Fixed changed hfs_vget() to release complex node when retrying for data fork node.
 *              27-Jul-1998     Scott Roberts   Changes hfs_vget() to return data forks instead of complex.
 *         14-Jul-1998  CHW                     Added check for use count of device node in hfs_mountfs
 *          1-Jul-1998  Don Brady               Always set kHFSVolumeUnmountedMask bit of vcb->vcbAtrb in hfs_unmount.
 *         30-Jun-1998  Don Brady               Removed hard-coded EINVAL error in hfs_mountfs (for radar #2249539).
 *         24-Jun-1998  Don Brady               Added setting of timezone to hfs_mount (radar #2226387).
 *              4-Jun-1998      Don Brady               Use VPUT/VRELE macros instead of vput/vrele.
 *              6-May-1998      Scott Roberts   Updated hfs_vget with kernel changes.
 *              29-Apr-1998     Don Brady               Update hfs_statfs to actually fill in statfs fields (radar #2227092).
 *              23-Apr-1998     Pat Dirks               Cleaned up code to call brelse() on errors from bread().
 *               4/20/1998      Don Brady               Remove course-grained hfs metadata locking.
 *               4/18/1998      Don Brady               Add VCB locking.
 *               4/16/1998      Don Brady       hfs_unmount now flushes the volume bitmap. Add b-tree locking to hfs_vget.
 *                4/8/1998      Don Brady       Replace hfs_mdbupdate with hfs_flushvolumeheader and hfs_flushMDB.
 *                4/8/1998      Don Brady       In hfs_unmount call hfs_mdbupdate before trashing metafiles!
 *                4/3/1998      Don Brady       Call InitCatalogCache instead of PostInitFS.
 *                4/1/1998      Don Brady       Get rid of gHFSFlags, gReqstVol and gFlushOnlyFlag globals (not used).
 *               3/30/1998      Don Brady       In hfs_unmount use SKIPSYSTEM option on first vflush.
 *               3/26/1998      Don Brady       Changed hfs_unmount to call vflush before calling hfsUnmount.
 *                                                              In hfs_mountfs don't mount hfs-wrapper.
 *               3/19/1998      Pat Dirks       Fixed bug in hfs_mount where device vnode was being
 *                                                              released on way out.
 *      11/14/1997      Pat Dirks       Derived from hfs_vfsops.c
 */
#include <sys/param.h>
#include <sys/systm.h>

#include <sys/ubc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <dev/disk.h>
#include <sys/lock.h>
#include <miscfs/specfs/specdev.h>
#include <hfs/hfs_mount.h>

#include "hfs.h"
#include "hfs_dbg.h"
#include "hfs_endian.h"

#include "hfscommon/headers/FileMgrInternal.h"
#include "hfscommon/headers/BTreesInternal.h"

#if     HFS_DIAGNOSTIC
int hfs_dbg_all = 0;
int hfs_dbg_vfs = 0;
int hfs_dbg_vop = 0;
int hfs_dbg_load = 0;
int hfs_dbg_io = 0;
int hfs_dbg_utils = 0;
int hfs_dbg_rw = 0;
int hfs_dbg_lookup = 0;
int hfs_dbg_tree = 0;
int hfs_dbg_err = 0;
int hfs_dbg_test = 0;
#endif

/*
 * HFS File System globals:
 */
Ptr                                     gBufferAddress[BUFFERPTRLISTSIZE];
struct buf                      *gBufferHeaderPtr[BUFFERPTRLISTSIZE];
int                                     gBufferListIndex;
simple_lock_data_t      gBufferPtrListLock;

//static char hfs_fs_name[MFSNAMELEN] = "hfs";

/* The following represent information held in low-memory on the MacOS: */

struct FSVarsRec        *gFSMVars;

/*
 * Global variables defined in other modules:
 */
extern struct vnodeopv_desc hfs_vnodeop_opv_desc;

extern struct vnode *hfs_vhashget(dev_t dev, UInt32 nodeID, UInt8 forkType);

extern OSErr HFSPlusToHFSExtents( const HFSPlusExtentRecord     oldExtents, HFSExtentRecord newExtents);


extern void inittodr( time_t base);
extern OSErr GetVolumeNameFromCatalog(ExtendedVCB *vcb);
extern void CopyCatalogToObjectMeta(struct hfsCatalogInfo *catInfo, struct vnode *vp, struct hfsfilemeta *fm);
extern void CopyCatalogToFCB(struct hfsCatalogInfo *catInfo, struct vnode *vp);
extern void hfs_name_CatToMeta(CatalogNodeData *nodeData, struct hfsfilemeta *fm);

int hfs_changefs(struct mount *mp, struct hfs_mount_args *args, struct proc *p);

int hfs_reload(struct mount *mp, struct ucred *cred, struct proc *p);
int hfs_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p, struct hfs_mount_args *args);
int hfs_vget(struct mount *mp, void *objID, struct vnode **vpp);
void hfs_vhashinit();
void hfs_converterinit(void);


static int hfs_statfs();


/*
 * Called by vfs_mountroot when mounting HFS Plus as root.
 */
int
hfs_mountroot()
{
        extern struct vnode *rootvp;
        struct mount *mp;
        struct proc *p = current_proc();        /* XXX */
        struct hfsmount *hfsmp;
        int error;
        
        /*
         * Get vnode for rootdev.
         */
        if ((error = bdevvp(rootdev, &rootvp))) {
                printf("hfs_mountroot: can't setup bdevvp");
                return (error);
        }
        if ((error = vfs_rootmountalloc("hfs", "root_device", &mp)))
                return (error);
        if ((error = hfs_mountfs(rootvp, mp, p, NULL))) {
                mp->mnt_vfc->vfc_refcount--;
                vfs_unbusy(mp, p);
                _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
                return (error);
        }
        simple_lock(&mountlist_slock);
        CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
        simple_unlock(&mountlist_slock);
        
        /* Init hfsmp */
        hfsmp = VFSTOHFS(mp);

        hfsmp->hfs_dir_mask = (S_IRWXU|S_IRWXG|S_IRWXO);                /* 0777 */
        hfsmp->hfs_file_mask = (S_IRWXU|S_IRWXG|S_IRWXO);               /* 0777 */

        (void)hfs_statfs(mp, &mp->mnt_stat, p);
        
        vfs_unbusy(mp, p);
        inittodr(to_bsd_time(HFSTOVCB(hfsmp)->vcbLsMod));
        return (0);
}


/*
 * VFS Operations.
 *
 * mount system call
 */

int
hfs_mount (mp, path, data, ndp, p)
        register struct mount *mp;
        char *path;
        caddr_t data;
        struct nameidata *ndp;
        struct proc *p;
{
        struct hfsmount *hfsmp = NULL;
        struct vnode *devvp;
        struct hfs_mount_args args;
        size_t size;
        int retval = E_NONE;
        int flags;
        mode_t accessmode;
        int loadconv = 0;

        if ((retval = copyin(data, (caddr_t)&args, sizeof(args))))
                goto error_exit;

        /*
         * If updating, check whether changing from read-only to
         * read/write; if there is no device name, that's all we do.
         */
        if (mp->mnt_flag & MNT_UPDATE) {

                hfsmp = VFSTOHFS(mp);
                if ((hfsmp->hfs_fs_ronly == 0) && (mp->mnt_flag & MNT_RDONLY)) {
                
                        /* use VFS_SYNC to push out System (btree) files */
                        retval = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p);
                        if (retval && ((mp->mnt_flag & MNT_FORCE) == 0))
                                goto error_exit;
                
                        flags = WRITECLOSE;
                        if (mp->mnt_flag & MNT_FORCE)
                                flags |= FORCECLOSE;
                                
                        if ((retval = hfs_flushfiles(mp, flags)))
                                goto error_exit;
                        hfsmp->hfs_fs_clean = 1;
                        hfsmp->hfs_fs_ronly = 1;
                        if (HFSTOVCB(hfsmp)->vcbSigWord == kHFSPlusSigWord)
                                retval = hfs_flushvolumeheader(hfsmp, MNT_WAIT);
                        else
                                retval = hfs_flushMDB(hfsmp, MNT_WAIT);

                        /* also get the volume bitmap blocks */
                        if (!retval)
                                retval = VOP_FSYNC(hfsmp->hfs_devvp, NOCRED, MNT_WAIT, p);

                        if (retval) {
                                hfsmp->hfs_fs_clean = 0;
                                hfsmp->hfs_fs_ronly = 0;
                                goto error_exit;
                        }
                }

                if ((mp->mnt_flag & MNT_RELOAD) &&
                        (retval = hfs_reload(mp, ndp->ni_cnd.cn_cred, p)))
                        goto error_exit;

                if (hfsmp->hfs_fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
                        /*
                         * If upgrade to read-write by non-root, then verify
                         * that user has necessary permissions on the device.
                         */
                        if (p->p_ucred->cr_uid != 0) {
                                devvp = hfsmp->hfs_devvp;
                                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
                                if ((retval = VOP_ACCESS(devvp, VREAD | VWRITE, p->p_ucred, p))) {
                                        VOP_UNLOCK(devvp, 0, p);
                                        goto error_exit;
                                }
                                VOP_UNLOCK(devvp, 0, p);
                        }
                        if (HFSTOVCB(hfsmp)->vcbSigWord == kHFSPlusSigWord)
                                retval = hfs_flushvolumeheader(hfsmp, MNT_WAIT);
                        else
                                retval = hfs_flushMDB(hfsmp, MNT_WAIT);
        
                        if (retval != E_NONE)
                                goto error_exit;

                        /* only change hfs_fs_ronly after a successfull write */
                        hfsmp->hfs_fs_ronly = 0;
                        hfsmp->hfs_fs_clean = 0;
                }

                if ((hfsmp->hfs_fs_ronly == 0) &&
                    (HFSTOVCB(hfsmp)->vcbSigWord == kHFSPlusSigWord)) {
                        /* setup private/hidden directory for unlinked files */
                        hfsmp->hfs_private_metadata_dir = FindMetaDataDirectory(HFSTOVCB(hfsmp));
                }

                if (args.fspec == 0) {
                        /*
                         * Process export requests.
                         */
                        return vfs_export(mp, &hfsmp->hfs_export, &args.export);
                }
        }

        /*
         * Not an update, or updating the name: look up the name
         * and verify that it refers to a sensible block device.
         */
        NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
        retval = namei(ndp);
        if (retval != E_NONE) {
                DBG_ERR(("hfs_mount: CAN'T GET DEVICE: %s, %x\n", args.fspec, ndp->ni_vp->v_rdev));
                goto error_exit;
        }

        devvp = ndp->ni_vp;

        if (devvp->v_type != VBLK) {
                vrele(devvp);
                retval = ENOTBLK;
                goto error_exit;
        }
        if (major(devvp->v_rdev) >= nblkdev) {
                vrele(devvp);
                retval = ENXIO;
                goto error_exit;
        }

        /*
         * If mount by non-root, then verify that user has necessary
         * permissions on the device.
         */
        if (p->p_ucred->cr_uid != 0) {
                accessmode = VREAD;
                if ((mp->mnt_flag & MNT_RDONLY) == 0)
                        accessmode |= VWRITE;
                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
                if ((retval = VOP_ACCESS(devvp, accessmode, p->p_ucred, p))) {
                        vput(devvp);
                        goto error_exit;
                }
                VOP_UNLOCK(devvp, 0, p);
        }

        if ((mp->mnt_flag & MNT_UPDATE) == 0) {
                retval = hfs_mountfs(devvp, mp, p, &args);
                if (retval != E_NONE)
                        vrele(devvp);
        } else {
                if (devvp != hfsmp->hfs_devvp)
                        retval = EINVAL;        /* needs translation */
                else
                        retval = hfs_changefs(mp, &args, p);
                vrele(devvp);
        }

        if (retval != E_NONE) {
                goto error_exit;
        }

        
        /* Set the mount flag to indicate that we support volfs  */
        mp->mnt_flag |= MNT_DOVOLFS;
    if (VFSTOVCB(mp)->vcbSigWord == kHFSSigWord) {
        /* HFS volumes only want roman-encoded names: */
        mp->mnt_flag |= MNT_FIXEDSCRIPTENCODING;
    }
        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN-1, &size);
        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        (void)hfs_statfs(mp, &mp->mnt_stat, p);
        return (E_NONE);

error_exit:

        return (retval);
}


/* change fs mount parameters */
int
hfs_changefs(mp, args, p)
        struct mount *mp;
        struct hfs_mount_args *args;
        struct proc *p;
{
        int retval;
        int namefix, permfix, permswitch;
        struct hfsmount *hfsmp;
        struct hfsnode *hp;
        mode_t hfs_file_mask;
        ExtendedVCB *vcb;
        hfsCatalogInfo catInfo;
        register struct vnode *vp, *nvp;
        hfs_to_unicode_func_t   get_unicode_func;
        unicode_to_hfs_func_t   get_hfsname_func;

        hfsmp = VFSTOHFS(mp);
        vcb = HFSTOVCB(hfsmp);
        permswitch = (((hfsmp->hfs_unknownpermissions != 0) && ((mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) == 0)) ||
                                        ((hfsmp->hfs_unknownpermissions == 0) && ((mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) != 0)));
        hfsmp->hfs_unknownpermissions = ((mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) != 0);
        namefix =  permfix = 0;

        /* change the timezone (Note: this affects all hfs volumes and hfs+ volume create dates) */
        if (args->hfs_timezone.tz_minuteswest != VNOVAL) {
                gTimeZone = args->hfs_timezone;
        }

        /* change the default uid, gid and/or mask */
        if ((args->hfs_uid != (uid_t)VNOVAL) && (hfsmp->hfs_uid != args->hfs_uid)) {
                hfsmp->hfs_uid = args->hfs_uid;
                ++permfix;
        }
        if ((args->hfs_gid != (gid_t)VNOVAL) && (hfsmp->hfs_gid != args->hfs_gid)) {
                hfsmp->hfs_gid = args->hfs_gid;
                ++permfix;
        }
        if (args->hfs_mask != (mode_t)VNOVAL) {
                if (hfsmp->hfs_dir_mask != (args->hfs_mask & ALLPERMS)) {
                        hfsmp->hfs_dir_mask = args->hfs_mask & ALLPERMS;
                        hfsmp->hfs_file_mask = args->hfs_mask & ALLPERMS;
                        if ((args->flags != VNOVAL) && (args->flags & HFSFSMNT_NOXONFILES))
                                hfsmp->hfs_file_mask = (args->hfs_mask & DEFFILEMODE);
                        ++permfix;
                }
        }
        
        /* change the hfs encoding value (hfs only) */
        if ((HFSTOVCB(hfsmp)->vcbSigWord == kHFSSigWord)        &&
            (hfsmp->hfs_encoding != (u_long)VNOVAL)             &&
            (hfsmp->hfs_encoding != args->hfs_encoding)) {

                retval = hfs_getconverter(args->hfs_encoding, &get_unicode_func, &get_hfsname_func);
                if (retval) goto error_exit;

                /*
                 * Connect the new hfs_get_unicode converter but leave
                 * the old hfs_get_hfsname converter in place so that
                 * we can lookup existing vnodes to get their correctly
                 * encoded names.
                 *
                 * When we're all finished, we can then connect the new
                 * hfs_get_hfsname converter and release our interest
                 * in the old converters.
                 */
                hfsmp->hfs_get_unicode = get_unicode_func;
                ++namefix;
        }


        if (!(namefix || permfix || permswitch)) goto exit;

        /*
         * For each active vnode fix things that changed
         *
         * Note that we can visit a vnode more than once
         * and we can race with fsync.
         */
        simple_lock(&mntvnode_slock);
loop:
        for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
                /*
                 * If the vnode that we are about to fix is no longer
                 * associated with this mount point, start over.
                 */
                if (vp->v_mount != mp)
                    goto loop;
         
                simple_lock(&vp->v_interlock);
                nvp = vp->v_mntvnodes.le_next;
                if (vp->v_flag & VSYSTEM) {
                        simple_unlock(&vp->v_interlock);
                        continue;
                }
                simple_unlock(&mntvnode_slock);
                retval = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p);
                if (retval) {
                    simple_lock(&mntvnode_slock);
                    if (retval == ENOENT)
                        goto loop;
                    continue;
                }
        
                hp = VTOH(vp);

                INIT_CATALOGDATA(&catInfo.nodeData, 0);
                
                catInfo.hint = kNoHint;
                retval = hfs_getcatalog(vcb, H_DIRID(hp), H_NAME(hp), hp->h_meta->h_namelen, &catInfo);
                /* If we couldn't find this guy skip to the next one */
                if (retval) {
                        if (namefix)
                                cache_purge(vp);
                        vput(vp);
                        simple_lock(&mntvnode_slock);
                        continue;
                }

                H_HINT(hp) = catInfo.hint;
                if (permswitch || (permfix && (hp->h_meta->h_metaflags & IN_UNSETACCESS))) {
                        if ((vcb->vcbSigWord == kHFSPlusSigWord) && (catInfo.nodeData.cnd_mode & IFMT)) {
                                if (mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) {
                                        /*
                                         *      Override the permissions as determined by the mount auguments
                                         *  in ALMOST the same way unset permissions are treated but keep
                                         *      track of whether or not the file or folder is hfs locked
                                         *  by leaving the h_pflags field unchanged from what was unpacked
                                         *  out of the catalog.
                                         */ 
                                        hp->h_meta->h_metaflags |= IN_UNSETACCESS;                      
                                        hp->h_meta->h_uid = VTOHFS(vp)->hfs_uid;
                                        hp->h_meta->h_gid = VTOHFS(vp)->hfs_gid;
                                } else {
                                        hp->h_meta->h_uid = catInfo.nodeData.cnd_ownerID;
                                        hp->h_meta->h_gid = catInfo.nodeData.cnd_groupID;
                                };
                                hp->h_meta->h_mode = (mode_t)catInfo.nodeData.cnd_mode;
                        } else {
                                /*
                                 *      Set the permissions as determined by the mount auguments
                                 *      but keep in account if the file or folder is hfs locked
                                 */ 
                                hp->h_meta->h_metaflags |= IN_UNSETACCESS;                      
                                hp->h_meta->h_uid = VTOHFS(vp)->hfs_uid;
                                hp->h_meta->h_gid = VTOHFS(vp)->hfs_gid;
                                
                                /* Default access is full read/write/execute: */
                                hp->h_meta->h_mode = ACCESSPERMS;       /* 0777: rwxrwxrwx */
                                /* ... but no more than that permitted by the mount point's: */
                                if ((hp->h_meta->h_mode & IFMT) == IFDIR) {
                                        hp->h_meta->h_mode &= VTOHFS(vp)->hfs_dir_mask;
                                } else {
                                        hp->h_meta->h_mode &= VTOHFS(vp)->hfs_file_mask;
                                }
                        };
                };
                
                /*
                 * If we're switching name converters then...
                 *   Remove the existing entry from the namei cache.
                 *   Update name to one based on new encoder.
                 */
                if (namefix) {
                        cache_purge(vp);
                        hfs_name_CatToMeta(&catInfo.nodeData, hp->h_meta);

                        if (catInfo.nodeData.cnd_nodeID == kHFSRootFolderID)
                                strncpy(vcb->vcbVN, H_NAME(hp), NAME_MAX);
                }

                CLEAN_CATALOGDATA(&catInfo.nodeData);

                vput(vp);
                simple_lock(&mntvnode_slock);

                } /* end for (vp...) */
                simple_unlock(&mntvnode_slock);


exit:   
        /*
         * If we're switching name converters we can now
         * connect the new hfs_get_hfsname converter and
         * release our interest in the old converters.
         */
        if (namefix) {
                u_long old_encoding = hfsmp->hfs_encoding;

                hfsmp->hfs_get_hfsname = get_hfsname_func;
                hfsmp->hfs_encoding = args->hfs_encoding;
                vcb->volumeNameEncodingHint = args->hfs_encoding;

                (void) hfs_relconverter(old_encoding);
        }

        return (0);

error_exit:

        return (retval);
}


/*
 * Reload all incore data for a filesystem (used after running fsck on
 * the root filesystem and finding things to fix). The filesystem must
 * be mounted read-only.
 *
 * Things to do to update the mount:
 *      1) invalidate all cached meta-data.
 *      2) re-read volume header from disk.
 *      3) re-load meta-file info (extents, file size).
 *      4) re-load B-tree header data.
 *      5) invalidate all inactive vnodes.
 *      6) invalidate all cached file data.
 *      7) re-read hfsnode data for all active vnodes.
 */
int
hfs_reload(mountp, cred, p)
        register struct mount *mountp;
        struct ucred *cred;
        struct proc *p;
{
        register struct vnode *vp, *nvp, *devvp;
        struct hfsnode *hp;
        struct buf *bp;
        int     size, error, i;
        struct hfsmount *hfsmp;
        struct HFSPlusVolumeHeader *vhp;
        ExtendedVCB *vcb;
        FCB *fcb;

        if ((mountp->mnt_flag & MNT_RDONLY) == 0)
                return (EINVAL);

        hfsmp = VFSTOHFS(mountp);
        vcb = HFSTOVCB(hfsmp);

        if (vcb->vcbSigWord == kHFSSigWord)
                return (EINVAL);        /* rooting from HFS is not supported! */

        /*
         * Invalidate all cached meta-data.
         */
        devvp = hfsmp->hfs_devvp;
        if (vinvalbuf(devvp, 0, cred, p, 0, 0))
                panic("hfs_reload: dirty1");
        InvalidateCatalogCache(vcb);

        /*
         * Re-read VolumeHeader from disk.
         */
        size = kMDBSize;
        error = bread(  hfsmp->hfs_devvp,
                        IOBLKNOFORBLK((vcb->hfsPlusIOPosOffset / 512) + kMasterDirectoryBlock, size),
                        IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, size),
                        NOCRED,
                        &bp);
        if (error) {
                if (bp != NULL)
                        brelse(bp);
                return (error);
        }

        vhp = (HFSPlusVolumeHeader *) ((char *)bp->b_data +
                        IOBYTEOFFSETFORBLK((vcb->hfsPlusIOPosOffset / 512) + kMasterDirectoryBlock, size));

        if ((ValidVolumeHeader(vhp) != 0) || (vcb->blockSize != SWAP_BE32 (vhp->blockSize))) {
                brelse(bp);
                return (EIO);           /* XXX needs translation */
        }

        vcb->vcbLsMod                   = SWAP_BE32 (vhp->modifyDate);
        vcb->vcbAtrb                    = (UInt16) SWAP_BE32 (vhp->attributes); /* VCB only uses lower 16 bits */
        vcb->vcbClpSiz                  = SWAP_BE32 (vhp->rsrcClumpSize);
        vcb->vcbNxtCNID                 = SWAP_BE32 (vhp->nextCatalogID);
        vcb->vcbVolBkUp                 = SWAP_BE32 (vhp->backupDate);
        vcb->vcbWrCnt                   = SWAP_BE32 (vhp->writeCount);
        vcb->vcbFilCnt                  = SWAP_BE32 (vhp->fileCount);
        vcb->vcbDirCnt                  = SWAP_BE32 (vhp->folderCount);
        vcb->nextAllocation     = SWAP_BE32 (vhp->nextAllocation);
        vcb->totalBlocks                = SWAP_BE32 (vhp->totalBlocks);
        vcb->freeBlocks                 = SWAP_BE32 (vhp->freeBlocks);
        vcb->checkedDate                = SWAP_BE32 (vhp->checkedDate);
        vcb->encodingsBitmap    = SWAP_BE64 (vhp->encodingsBitmap);
        bcopy(vhp->finderInfo, vcb->vcbFndrInfo, sizeof(vhp->finderInfo));    
        vcb->localCreateDate    = SWAP_BE32 (vhp->createDate); /* hfs+ create date is in local time */ 

        /*
         * Re-load meta-file vnode data (extent info, file size, etc).
         */
        fcb = VTOFCB((struct vnode *)vcb->extentsRefNum);
        /* bcopy(vhp->extentsFile.extents, fcb->fcbExtents, sizeof(HFSPlusExtentRecord)); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        fcb->fcbExtents[i].startBlock   = SWAP_BE32 (vhp->extentsFile.extents[i].startBlock);
        fcb->fcbExtents[i].blockCount   = SWAP_BE32 (vhp->extentsFile.extents[i].blockCount);
    }
        fcb->fcbEOF                     = SWAP_BE64 (vhp->extentsFile.logicalSize);
        fcb->fcbPLen            = SWAP_BE32 (vhp->extentsFile.totalBlocks) * vcb->blockSize;
        fcb->fcbClmpSize        = SWAP_BE32 (vhp->extentsFile.clumpSize);

        fcb = VTOFCB((struct vnode *)vcb->catalogRefNum);
        /* bcopy(vhp->catalogFile.extents, fcb->fcbExtents, sizeof(HFSPlusExtentRecord)); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        fcb->fcbExtents[i].startBlock   = SWAP_BE32 (vhp->catalogFile.extents[i].startBlock);
        fcb->fcbExtents[i].blockCount   = SWAP_BE32 (vhp->catalogFile.extents[i].blockCount);
    }
        fcb->fcbPLen            = SWAP_BE64 (vhp->catalogFile.logicalSize);
        fcb->fcbPLen            = SWAP_BE32 (vhp->catalogFile.totalBlocks) * vcb->blockSize;
        fcb->fcbClmpSize        = SWAP_BE32 (vhp->catalogFile.clumpSize);

        fcb = VTOFCB((struct vnode *)vcb->allocationsRefNum);
        /* bcopy(vhp->allocationFile.extents, fcb->fcbExtents, sizeof(HFSPlusExtentRecord)); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        fcb->fcbExtents[i].startBlock   = SWAP_BE32 (vhp->allocationFile.extents[i].startBlock);
        fcb->fcbExtents[i].blockCount   = SWAP_BE32 (vhp->allocationFile.extents[i].blockCount);
    }
        fcb->fcbEOF                     = SWAP_BE64 (vhp->allocationFile.logicalSize);
        fcb->fcbPLen            = SWAP_BE32 (vhp->allocationFile.totalBlocks) * vcb->blockSize;
        fcb->fcbClmpSize        = SWAP_BE32 (vhp->allocationFile.clumpSize);

        brelse(bp);
        vhp = NULL;

        /*
         * Re-load B-tree header data
         */
        fcb = VTOFCB((struct vnode *)vcb->extentsRefNum);
        if (error = MacToVFSError( BTReloadData(fcb) ))
                return (error);

        fcb = VTOFCB((struct vnode *)vcb->catalogRefNum);
        if (error = MacToVFSError( BTReloadData(fcb) ))
                return (error);

        /* Now that the catalog is ready, get the volume name */
        /* also picks up the create date in GMT */
        if ((error = MacToVFSError( GetVolumeNameFromCatalog(vcb) )))
                return (error);

        /* Re-establish private/hidden directory for unlinked files */
        hfsmp->hfs_private_metadata_dir = FindMetaDataDirectory(vcb);

loop:
        simple_lock(&mntvnode_slock);
        for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
                if (vp->v_mount != mountp) {
                        simple_unlock(&mntvnode_slock);
                        goto loop;
                }
                nvp = vp->v_mntvnodes.le_next;

                /*
                 * Invalidate all inactive vnodes.
                 */
                if (vrecycle(vp, &mntvnode_slock, p))
                        goto loop;

                /*
                 * Invalidate all cached file data.
                 */
                simple_lock(&vp->v_interlock);
                simple_unlock(&mntvnode_slock);
                if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
                        goto loop;
                }
                if (vinvalbuf(vp, 0, cred, p, 0, 0))
                        panic("hfs_reload: dirty2");

                /*
                 * Re-read hfsnode data for all active vnodes (non-metadata files).
                 */
                hp = VTOH(vp);
                if ((vp->v_flag & VSYSTEM) == 0) {
                        hfsCatalogInfo catInfo;

                        /* lookup by fileID since name could have changed */
                        catInfo.hint = kNoHint;
                        INIT_CATALOGDATA(&catInfo.nodeData, 0);

                        if ((error = hfs_getcatalog(vcb, H_FILEID(hp), NULL, -1, &catInfo))) {
                                vput(vp);
                                CLEAN_CATALOGDATA(&catInfo.nodeData);
                                return (error);
                        }

                        H_HINT(hp) = catInfo.hint;
            if (hp->h_meta->h_metaflags & IN_LONGNAME)
                                FREE(H_NAME(hp), M_TEMP);
                        H_NAME(hp) = NULL;
            hp->h_meta->h_namelen = 0;
                        CopyCatalogToObjectMeta(&catInfo, vp, hp->h_meta);
                        CopyCatalogToFCB(&catInfo, vp);
                        
                        CLEAN_CATALOGDATA(&catInfo.nodeData);
                }

                vput(vp);
                simple_lock(&mntvnode_slock);
        }
        simple_unlock(&mntvnode_slock);

        return (0);
}


/*
 * Common code for mount and mountroot
 */
int
hfs_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p, struct hfs_mount_args *args)
{
    int                         retval = E_NONE;
    register struct hfsmount    *hfsmp;
    struct buf                                  *bp;
    dev_t                       dev;
    HFSMasterDirectoryBlock             *mdbp;
    int                         ronly;
    struct ucred                                *cred;
        u_long diskBlks;
        u_long blksize;
    DBG_VFS(("hfs_mountfs: mp = 0x%lX\n", (u_long)mp));

    dev = devvp->v_rdev;
    cred = p ? p->p_ucred : NOCRED;
    /*
     * Disallow multiple mounts of the same device.
     * Disallow mounting of a device that is currently in use
     * (except for root, which might share swap device for miniroot).
     * Flush out any old buffers remaining from a previous use.
     */
    if ((retval = vfs_mountedon(devvp)))
        return (retval);
    if ((vcount(devvp) > 1) && (devvp != rootvp))
                return (EBUSY);
    if ((retval = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)))
        return (retval);

    ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
    DBG_VFS(("hfs_mountfs: opening device...\n"));
    if ((retval = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)))
        return (retval);

    blksize = kHFSBlockSize;
    DBG_VFS(("hfs_mountfs: size = %d (DEV_BSIZE = %d).\n", blksize, DEV_BSIZE));

    bp = NULL;
    hfsmp = NULL;

        /*      
         * XXX SER Currently we only support 512 block size systems. This might change
         * So this is a place holder to remind us that the mdb might not be 512 aligned
         * retval = VOP_IOCTL(devvp, DKIOCGETBLOCKSIZE, &blksize, FWRITE, cred, p);
         * if (retval) return retval;
         */

    /*
         * the next three lines should probably be replaced
         * with a call to the yet unimplemented function VOP_SETBLOCKSIZE
         */
        retval = VOP_IOCTL(devvp, DKIOCSETBLOCKSIZE, &blksize, FWRITE, cred, p);
        if (retval) return retval;
        devvp->v_specsize = blksize;

    DBG_VFS(("hfs_mountfs: reading MDB [block no. %d + %d bytes, size %d bytes]...\n",
             IOBLKNOFORBLK(kMasterDirectoryBlock, blksize),
             IOBYTEOFFSETFORBLK(kMasterDirectoryBlock, blksize),
             IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, blksize)));

    if ((retval = bread(devvp, IOBLKNOFORBLK(kMasterDirectoryBlock, blksize),
                                                   IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, blksize), cred, &bp))) {
        goto error_exit;
        };
    mdbp = (HFSMasterDirectoryBlock*) ((char *)bp->b_data + IOBYTEOFFSETFORBLK(kMasterDirectoryBlock, blksize));

    MALLOC(hfsmp, struct hfsmount *, sizeof(struct hfsmount), M_HFSMNT, M_WAITOK);
    bzero(hfsmp, sizeof(struct hfsmount));

        simple_lock_init(&hfsmp->hfs_renamelock);

    DBG_VFS(("hfs_mountfs: Initializing hfsmount structure at 0x%lX...\n", (u_long)hfsmp));
    /*
     *  Init the volume information structure
     */
    mp->mnt_data = (qaddr_t)hfsmp;
    hfsmp->hfs_mp = mp;                                         /* Make VFSTOHFS work */
    hfsmp->hfs_vcb.vcb_hfsmp = hfsmp;           /* Make VCBTOHFS work */
    hfsmp->hfs_raw_dev = devvp->v_rdev;
    hfsmp->hfs_devvp = devvp;
    hfsmp->hfs_phys_block_size = blksize;
    
    /* The hfs_log_block_size field is updated in the respective hfs_MountHFS[Plus]Volume routine */
    hfsmp->hfs_logBlockSize = BestBlockSizeFit(SWAP_BE32 (mdbp->drAlBlkSiz), MAXBSIZE, hfsmp->hfs_phys_block_size);
    hfsmp->hfs_fs_ronly = ronly;
    hfsmp->hfs_unknownpermissions = ((mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) != 0);
        if (args) {
                hfsmp->hfs_uid = (args->hfs_uid == (uid_t)VNOVAL) ? UNKNOWNUID : args->hfs_uid;
                if (hfsmp->hfs_uid == 0xfffffffd) hfsmp->hfs_uid = UNKNOWNUID;
                hfsmp->hfs_gid = (args->hfs_gid == (gid_t)VNOVAL) ? UNKNOWNGID : args->hfs_gid;
                if (hfsmp->hfs_gid == 0xfffffffd) hfsmp->hfs_gid = UNKNOWNGID;
                if (args->hfs_mask != (mode_t)VNOVAL) {
                        hfsmp->hfs_dir_mask = args->hfs_mask & ALLPERMS;
                        if (args->flags & HFSFSMNT_NOXONFILES) {
                                hfsmp->hfs_file_mask = (args->hfs_mask & DEFFILEMODE);
                        } else {
                                hfsmp->hfs_file_mask = args->hfs_mask & ALLPERMS;
                        }
                } else {
                        hfsmp->hfs_dir_mask = UNKNOWNPERMISSIONS & ALLPERMS;            /* 0777: rwx---rwx */
                        hfsmp->hfs_file_mask = UNKNOWNPERMISSIONS & DEFFILEMODE;        /* 0666: no --x by default? */
                };
        } else {
                /* Even w/o explicit mount arguments, MNT_UNKNOWNPERMISSIONS requires setting up uid, gid, and mask: */
                if (mp->mnt_flag & MNT_UNKNOWNPERMISSIONS) {
                        hfsmp->hfs_uid = UNKNOWNUID;
                        hfsmp->hfs_gid = UNKNOWNGID;
                        hfsmp->hfs_dir_mask = UNKNOWNPERMISSIONS & ALLPERMS;            /* 0777: rwx---rwx */
                        hfsmp->hfs_file_mask = UNKNOWNPERMISSIONS & DEFFILEMODE;        /* 0666: no --x by default? */
                };
        };
        
        /*      See above comment for DKIOCGETBLOCKSIZE
         * retval = VOP_IOCTL(devvp, DKIOCSETBLOCKSIZE, &blksize, FWRITE, cred, p);
         * if (retval) return retval;
         */

        retval = VOP_IOCTL(devvp, DKIOCNUMBLKS, (caddr_t)&diskBlks, 0, cred, p);
        if (retval) return retval;

        if (SWAP_BE16 (mdbp->drSigWord) == kHFSPlusSigWord) {
        /* Enidan swap volume header in place */
        /* SWAP_HFS_PLUS_VOLUME_HEADER ((HFSPlusVolumeHeader *)bp->b_data); */

                /* mount wrapper-less HFS-Plus volume */
                (void) hfs_getconverter(0, &hfsmp->hfs_get_unicode, &hfsmp->hfs_get_hfsname);
                retval = hfs_MountHFSPlusVolume(hfsmp, (HFSPlusVolumeHeader*) bp->b_data, 0, diskBlks, p);

        /* Enidan un-swap volume header in place */
        /* SWAP_HFS_PLUS_VOLUME_HEADER ((HFSPlusVolumeHeader *)bp->b_data); */

        } else if (SWAP_BE16 (mdbp->drEmbedSigWord) == kHFSPlusSigWord) {
                u_long embBlkOffset;
                HFSPlusVolumeHeader     *vhp;

                embBlkOffset = SWAP_BE16 (mdbp->drAlBlSt) +
                    (SWAP_BE16 (mdbp->drEmbedExtent.startBlock) * (SWAP_BE32 (mdbp->drAlBlkSiz)/kHFSBlockSize));
                /* calculate virtual number of 512-byte sectors */
                diskBlks = SWAP_BE16 (mdbp->drEmbedExtent.blockCount) * (SWAP_BE32 (mdbp->drAlBlkSiz)/kHFSBlockSize);

                brelse(bp);
                bp = NULL;              /* done with MDB, go grab Volume Header */
                mdbp = NULL;

                retval = bread( devvp,
                                IOBLKNOFORBLK(kMasterDirectoryBlock+embBlkOffset, blksize),
                                IOBYTECCNTFORBLK(kMasterDirectoryBlock+embBlkOffset, kMDBSize, blksize),
                                cred,
                                &bp);
                if (retval) {
                        goto error_exit;
                };
                vhp = (HFSPlusVolumeHeader*) ((char *)bp->b_data + IOBYTEOFFSETFORBLK(kMasterDirectoryBlock, blksize));

        /* Enidan swap volume header in place */
        /* SWAP_HFS_PLUS_VOLUME_HEADER (vhp); */

                /* mount embedded HFS Plus volume */
                (void) hfs_getconverter(0, &hfsmp->hfs_get_unicode, &hfsmp->hfs_get_hfsname);
                retval = hfs_MountHFSPlusVolume(hfsmp, vhp, embBlkOffset, diskBlks, p);

        /* Enidan un-swap volume header in place */
        /* SWAP_HFS_PLUS_VOLUME_HEADER (vhp); */

        } else if (devvp != rootvp) {
                if (args) {
                        hfsmp->hfs_encoding = args->hfs_encoding;
                        HFSTOVCB(hfsmp)->volumeNameEncodingHint = args->hfs_encoding;


                        /* establish the timezone */
                        gTimeZone = args->hfs_timezone;
                }

                retval = hfs_getconverter(hfsmp->hfs_encoding, &hfsmp->hfs_get_unicode, &hfsmp->hfs_get_hfsname);
                if (retval) goto error_exit;

                /* mount HFS volume */
                retval = hfs_MountHFSVolume( hfsmp, mdbp, diskBlks, p);
                
                if (retval)
                        (void) hfs_relconverter(hfsmp->hfs_encoding);

        } else {
                /* sorry, we cannot root from HFS */
                retval = EINVAL;
    }

        if ( retval ) {
                goto error_exit;
        }

    brelse(bp);
    bp = NULL;
        
    mp->mnt_stat.f_fsid.val[0] = (long)dev;
    mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
    mp->mnt_maxsymlinklen = 0;
    devvp->v_specflags |= SI_MOUNTEDON;

    if (ronly == 0) {
        hfsmp->hfs_fs_clean = 0;
        if (HFSTOVCB(hfsmp)->vcbSigWord == kHFSPlusSigWord)
                (void) hfs_flushvolumeheader(hfsmp, MNT_WAIT);
        else
                (void) hfs_flushMDB(hfsmp, MNT_WAIT);
    }
    goto std_exit;

error_exit:
        DBG_VFS(("hfs_mountfs: exiting with error %d...\n", retval));

    if (bp)
        brelse(bp);
    (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
    if (hfsmp) {
        FREE(hfsmp, M_HFSMNT);
        mp->mnt_data = (qaddr_t)0;
    }

std_exit:
        return (retval);
}


/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
int hfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
    DBG_FUNC_NAME("hfs_start");
    DBG_PRINT_FUNC_NAME();

    return (0);
}


/*
 * unmount system call
 */
int
hfs_unmount(mp, mntflags, p)
        struct mount *mp;
        int mntflags;
        struct proc *p;
{
        struct hfsmount *hfsmp = VFSTOHFS(mp);
        int retval = E_NONE;
        int flags;

        flags = 0;
        if (mntflags & MNT_FORCE)
                flags |= FORCECLOSE;

        if ((retval = hfs_flushfiles(mp, flags)))
                return (retval);

        /*
         * Flush out the b-trees, volume bitmap and Volume Header
         */
        if (hfsmp->hfs_fs_ronly == 0) {
                retval = VOP_FSYNC(HFSTOVCB(hfsmp)->catalogRefNum, NOCRED, MNT_WAIT, p);
                if (retval && ((mntflags & MNT_FORCE) == 0))
                        return (retval);

                retval = VOP_FSYNC(HFSTOVCB(hfsmp)->extentsRefNum, NOCRED, MNT_WAIT, p);
                if (retval && ((mntflags & MNT_FORCE) == 0))
                        return (retval);

                if (retval = VOP_FSYNC(hfsmp->hfs_devvp, NOCRED, MNT_WAIT, p)) {
                        if ((mntflags & MNT_FORCE) == 0)
                                return (retval);
                }
                
                /* See if this volume is damaged, is so do not unmount cleanly */
                if (HFSTOVCB(hfsmp)->vcbFlags & kHFS_DamagedVolume) {
                        hfsmp->hfs_fs_clean = 0;
                        HFSTOVCB(hfsmp)->vcbAtrb &= ~kHFSVolumeUnmountedMask;
                } else {
            hfsmp->hfs_fs_clean = 1;
            HFSTOVCB(hfsmp)->vcbAtrb |= kHFSVolumeUnmountedMask;
                }
                if (HFSTOVCB(hfsmp)->vcbSigWord == kHFSPlusSigWord)
                        retval = hfs_flushvolumeheader(hfsmp, MNT_WAIT);
                else
                        retval = hfs_flushMDB(hfsmp, MNT_WAIT);
       
                if (retval) {
                        hfsmp->hfs_fs_clean = 0;
                        HFSTOVCB(hfsmp)->vcbAtrb &= ~kHFSVolumeUnmountedMask;
                        if ((mntflags & MNT_FORCE) == 0)
                                return (retval);        /* could not flush everything */
                }
        }

        /*
         *      Invalidate our caches and release metadata vnodes
         */
        (void) hfsUnmount(hfsmp, p);

        if (HFSTOVCB(hfsmp)->vcbSigWord == kHFSSigWord)
                (void) hfs_relconverter(hfsmp->hfs_encoding);

        hfsmp->hfs_devvp->v_specflags &= ~SI_MOUNTEDON;
        retval = VOP_CLOSE(hfsmp->hfs_devvp, hfsmp->hfs_fs_ronly ? FREAD : FREAD|FWRITE,
                        NOCRED, p);
        vrele(hfsmp->hfs_devvp);

        FREE(hfsmp, M_HFSMNT);
        mp->mnt_data = (qaddr_t)0;

        return (retval);
}


/*
 * Return the root of a filesystem.
 *
 *              OUT - vpp, should be locked and vget()'d (to increment usecount and lock)
 */
int hfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
    struct vnode *nvp;
    int retval;
    UInt32 rootObjID = kRootDirID;

    DBG_FUNC_NAME("hfs_root");
    DBG_PRINT_FUNC_NAME();

    if ((retval = VFS_VGET(mp, &rootObjID, &nvp)))
        return (retval);

    *vpp = nvp;
    return (0);
}


/*
 * Do operations associated with quotas
 */
int hfs_quotactl(mp, cmds, uid, arg, p)
struct mount *mp;
int cmds;
uid_t uid;
caddr_t arg;
struct proc *p;
{
    DBG_FUNC_NAME("hfs_quotactl");
    DBG_PRINT_FUNC_NAME();

    return (EOPNOTSUPP);
}


/*
 * Get file system statistics.
 */
static int
hfs_statfs(mp, sbp, p)
        struct mount *mp;
        register struct statfs *sbp;
        struct proc *p;
{
        ExtendedVCB *vcb = VFSTOVCB(mp);
        struct hfsmount *hfsmp = VFSTOHFS(mp);
        u_long freeCNIDs;

        DBG_FUNC_NAME("hfs_statfs");
        DBG_PRINT_FUNC_NAME();

        freeCNIDs = (u_long)0xFFFFFFFF - (u_long)vcb->vcbNxtCNID;

        sbp->f_bsize = vcb->blockSize;
        sbp->f_iosize = hfsmp->hfs_logBlockSize;
        sbp->f_blocks = vcb->totalBlocks;
        sbp->f_bfree = vcb->freeBlocks;
        sbp->f_bavail = vcb->freeBlocks;
        sbp->f_files = vcb->totalBlocks - 2;  /* max files is constrained by total blocks */
        sbp->f_ffree = MIN(freeCNIDs, vcb->freeBlocks);
        
        sbp->f_type = 0;
        if (sbp != &mp->mnt_stat) {
                sbp->f_type = mp->mnt_vfc->vfc_typenum;
                bcopy((caddr_t)mp->mnt_stat.f_mntonname,
                        (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
                bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
                        (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
        }
        return (0);
}


/*
 * Go through the disk queues to initiate sandbagged IO;
 * go through the inodes to write those that have been modified;
 * initiate the writing of the super block if it has been modified.
 *
 * Note: we are always called with the filesystem marked `MPBUSY'.
 */
static int hfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
    struct vnode                *nvp, *vp;
    struct hfsnode              *hp;
    struct hfsmount             *hfsmp = VFSTOHFS(mp);
    ExtendedVCB                 *vcb;
    int error, allerror = 0;

    DBG_FUNC_NAME("hfs_sync");
    DBG_PRINT_FUNC_NAME();

        /*
         * During MNT_UPDATE hfs_changefs might be manipulating
         * vnodes so back off
         */
        if (mp->mnt_flag & MNT_UPDATE)
                return (0);

    hfsmp = VFSTOHFS(mp);
    if (hfsmp->hfs_fs_ronly != 0) {
        panic("update: rofs mod");
    };

    /*
     * Write back each 'modified' vnode
     */

loop:;
    simple_lock(&mntvnode_slock);
    for (vp = mp->mnt_vnodelist.lh_first;
         vp != NULL;
         vp = nvp) {
        /*
         * If the vnode that we are about to sync is no longer
         * associated with this mount point, start over.
         */
        if (vp->v_mount != mp) {
            simple_unlock(&mntvnode_slock);
            goto loop;
        }
        simple_lock(&vp->v_interlock);
        nvp = vp->v_mntvnodes.le_next;
        hp = VTOH(vp);

        if ((vp->v_type == VNON) || (((hp->h_nodeflags & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0) &&
            (vp->v_dirtyblkhd.lh_first == NULL) && !(vp->v_flag & VHASDIRTY))) {
            simple_unlock(&vp->v_interlock);
            simple_unlock(&mntvnode_slock);
            simple_lock(&mntvnode_slock);
            continue;
        }

        simple_unlock(&mntvnode_slock);
        error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p);
        if (error) {
            if (error == ENOENT)
                goto loop;
            simple_lock(&mntvnode_slock);
            continue;
        }
                
        if ((error = VOP_FSYNC(vp, cred, waitfor, p))) {
            DBG_ERR(("hfs_sync: error %d calling fsync on vnode 0x%X.\n", error, (u_int)vp));
            allerror = error;
        };
        DBG_ASSERT(*((volatile int *)(&(vp)->v_interlock))==0);
        vput(vp);
        simple_lock(&mntvnode_slock);
    };

        vcb = HFSTOVCB(hfsmp);

    /* Now reprocess the BTree node, stored above */
    {
    struct vnode                *btvp;
        /*
         * If the vnode that we are about to sync is no longer
         * associated with this mount point, start over.
         */
        btvp = vcb->extentsRefNum;
        if ((btvp==0) || (btvp->v_type == VNON) || (btvp->v_mount != mp))
            goto skipBtree;
        simple_lock(&btvp->v_interlock);
        hp = VTOH(btvp);
        if (((hp->h_nodeflags & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0) &&
            (btvp->v_dirtyblkhd.lh_first == NULL) && !(btvp->v_flag & VHASDIRTY)) {
            simple_unlock(&btvp->v_interlock);
            goto skipBtree;
        }
        simple_unlock(&mntvnode_slock);
        error = vget(btvp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p);
        if (error) {
            simple_lock(&mntvnode_slock);
            goto skipBtree;
        }
        if ((error = VOP_FSYNC(btvp, cred, waitfor, p)))
            allerror = error;
        VOP_UNLOCK(btvp, 0, p);
        vrele(btvp);
        simple_lock(&mntvnode_slock);
    };

skipBtree:;

    simple_unlock(&mntvnode_slock);

    /*
     * Force stale file system control information to be flushed.
     */
    if ((error = VOP_FSYNC(hfsmp->hfs_devvp, cred, waitfor, p)))
        allerror = error;
    /*
     * Write back modified superblock.
     */

    if (IsVCBDirty(vcb)) {
        if (vcb->vcbSigWord == kHFSPlusSigWord)
                error = hfs_flushvolumeheader(hfsmp, waitfor);
        else
                error = hfs_flushMDB(hfsmp, waitfor);
        
        if (error)
            allerror = error;
    };

    return (allerror);
}


/*
 * File handle to vnode
 *
 * Have to be really careful about stale file handles:
 * - check that the hfsnode number is valid
 * - call hfs_vget() to get the locked hfsnode
 * - check for an unallocated hfsnode (i_mode == 0)
 * - check that the given client host has export rights and return
 *   those rights via. exflagsp and credanonp
 */
int
hfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
        struct hfsfid *hfsfhp;
        struct vnode *nvp;
        int result;
        struct netcred *np;
    DBG_FUNC_NAME("hfs_fhtovp");
    DBG_PRINT_FUNC_NAME();

        *vpp = NULL;
        hfsfhp = (struct hfsfid *)fhp;

        /*
         * Get the export permission structure for this <mp, client> tuple.
         */
        np = vfs_export_lookup(mp, &VFSTOHFS(mp)->hfs_export, nam);
        if (np == NULL) {
                return EACCES;
        };

        result = VFS_VGET(mp, &hfsfhp->hfsfid_cnid, &nvp);
        if (result) return result;
        if (nvp == NULL) return ESTALE;
        
        if ((hfsfhp->hfsfid_gen != VTOH(nvp)->h_meta->h_crtime)) {
                vput(nvp);
                return ESTALE;
        };
        
        *vpp = nvp;
        *exflagsp = np->netc_exflags;
        *credanonp = &np->netc_anon;
        
    return 0;
}


/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
static int hfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
        struct hfsnode *hp;
        struct hfsfid *hfsfhp;
        struct proc *p = current_proc();
        int result;
    u_int32_t fileID;
    DBG_FUNC_NAME("hfs_vptofh");
    DBG_PRINT_FUNC_NAME();

        hp = VTOH(vp);
        hfsfhp = (struct hfsfid *)fhp;
        
        /* If a file handle is requested for a file on an HFS volume we must be sure
                to create the thread record before returning the object id in the filehandle
                to make sure the file can be retrieved by fileid if necessary:
         */
        if ((vp->v_type == VREG) && ISHFS(VTOVCB(vp))) {
                /* Create a thread record and return the FileID [which is the file's fileNumber] */
                /* lock catalog b-tree */
                if ((result = hfs_metafilelocking(VTOHFS(vp), kHFSCatalogFileID, LK_EXCLUSIVE, p)) != 0) return result;
                result = hfsCreateFileID(VTOVCB(vp), H_DIRID(hp), H_NAME(hp), H_HINT(hp), &fileID);
                (void) hfs_metafilelocking(VTOHFS(vp), kHFSCatalogFileID, LK_RELEASE, p);
                if (result) {
                        DBG_ERR(("hfs_vptofh: error %d on CreateFileIDRef.\n", result));
                        return result;
                };
                DBG_ASSERT(fileID == H_FILEID(hp));
        };

        hfsfhp->hfsfid_len = sizeof(struct hfsfid);
        hfsfhp->hfsfid_pad = 0;
        hfsfhp->hfsfid_cnid = H_FILEID(hp);
        hfsfhp->hfsfid_gen = hp->h_meta->h_crtime;
        
        return 0;
}


/*
 * Initial HFS filesystems, done only once.
 */
int
hfs_init(vfsp)
struct vfsconf *vfsp;
{
    int i;
    static int done = 0;
    OSErr err;

    DBG_FUNC_NAME("hfs_init");
    DBG_PRINT_FUNC_NAME();

    if (done)
        return (0);
    done = 1;
    hfs_vhashinit();
    hfs_converterinit();

    simple_lock_init (&gBufferPtrListLock);

    for (i = BUFFERPTRLISTSIZE - 1; i >= 0; --i) {
        gBufferAddress[i] = NULL;
        gBufferHeaderPtr[i] = NULL;
    };
    gBufferListIndex = 0;

    /*
     * Do any initialization that the MacOS/MacOS X shared code relies on
     * (normally done as part of MacOS's startup):
     */
    MALLOC(gFSMVars, FSVarsRec *, sizeof(FSVarsRec), M_TEMP, M_WAITOK);
    bzero(gFSMVars, sizeof(FSVarsRec));

        /*
         * Allocate Catalog Iterator cache...
         */
        err = InitCatalogCache();
#if HFS_DIAGNOSTIC
    if (err) panic("hfs_init: Error returned from InitCatalogCache() call.");
#endif
        /*
         * XXX do we need to setup the following?
         *
         * GMT offset, Unicode globals, CatSearch Buffers, BTSscanner
         */

    return E_NONE;
}


/*
 * fast filesystem related variables.
 */
static int hfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
    DBG_FUNC_NAME("hfs_sysctl");
    DBG_PRINT_FUNC_NAME();

    return (EOPNOTSUPP);
}


/*      This will return a vnode of either a directory or a data vnode based on an object id. If
 *  it is a file id, its data fork will be returned.
 */
int
hfs_vget(struct mount *mp,
         void *ino,
         struct vnode **vpp)
{
    struct hfsmount     *hfsmp;
    dev_t                               dev;
    int                                 retval = E_NONE;

    DBG_VFS(("hfs_vget: ino = %ld\n", *(UInt32 *)ino));

        /* Check if unmount in progress */
        if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
                *vpp = NULL;
                return (EPERM);
        }

    hfsmp = VFSTOHFS(mp);
    dev = hfsmp->hfs_raw_dev;
        
        /* First check to see if it is in the cache */
    *vpp = hfs_vhashget(dev, *(UInt32 *)ino, kDefault);

        /* hide open files that have been deleted */
    if (*vpp != NULL) {
            if ((VTOH(*vpp)->h_meta->h_metaflags & IN_NOEXISTS) ||
                (hfsmp->hfs_private_metadata_dir != 0) &&
                (H_DIRID(VTOH(*vpp)) == hfsmp->hfs_private_metadata_dir)) {
                    vput(*vpp);
                    retval = ENOENT;
                    goto Err_Exit;
            }
    }
    
        /* The vnode is not in the cache, so lets make it */
    if (*vpp == NULL)
      {
        hfsCatalogInfo          catInfo;
        struct proc                     *p = current_proc();
        UInt8                           forkType;

                INIT_CATALOGDATA(&catInfo.nodeData, 0);
                catInfo.hint = kNoHint;
                /* Special-case the root's parent directory (DirID = 1) because
                   it doesn't actually exist in the catalog: */
                if ((*vpp == NULL) && (*(UInt32 *)ino == kRootParID)) {
                        bzero(&catInfo, sizeof(catInfo));
                        catInfo.nodeData.cnd_type = kCatalogFolderNode;
                        catInfo.nodeData.cnm_nameptr = catInfo.nodeData.cnm_namespace;
                        catInfo.nodeData.cnm_namespace[0] = '/';
                        catInfo.nodeData.cnm_length = 1;
                        catInfo.nodeData.cnd_nodeID = kRootParID;
                        catInfo.nodeData.cnm_parID = kRootParID;
                        catInfo.nodeData.cnd_valence = 1;
                        catInfo.nodeData.cnd_ownerID = 0;
                        catInfo.nodeData.cnd_groupID = 0;
                        catInfo.nodeData.cnd_mode = (S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO);
            } else {

            /* lock catalog b-tree */
            retval = hfs_metafilelocking(hfsmp, kHFSCatalogFileID, LK_SHARED, p);
            if (retval != E_NONE) goto Lookup_Err_Exit;

            retval = hfs_getcatalog(VFSTOVCB(mp), *(UInt32 *)ino, NULL, -1, &catInfo);

            /* unlock catalog b-tree */
            (void) hfs_metafilelocking(hfsmp, kHFSCatalogFileID, LK_RELEASE, p);

            if (retval != E_NONE) goto Lookup_Err_Exit;

            /* hide open files that have been deleted */
            if ((hfsmp->hfs_private_metadata_dir != 0) &&
                (catInfo.nodeData.cnm_parID == hfsmp->hfs_private_metadata_dir)) {
                retval = ENOENT;
                goto Lookup_Err_Exit;
                };
            };

        forkType = (catInfo.nodeData.cnd_type == kCatalogFolderNode) ? kDirectory : kDataFork;
        retval = hfs_vcreate(VFSTOVCB(mp), &catInfo, forkType, vpp);
                
Lookup_Err_Exit:
                CLEAN_CATALOGDATA(&catInfo.nodeData);
      };

        UBCINFOCHECK("hfs_vget", *vpp);

Err_Exit:

        if (retval != E_NONE) {
        DBG_VFS(("hfs_vget: Error returned of %d\n", retval));
                }
        else {
        DBG_VFS(("hfs_vget: vp = 0x%x\n", (u_int)*vpp));
                }

    return (retval);

}

/*
 * Flush out all the files in a filesystem.
 */
int
hfs_flushfiles(struct mount *mp, int flags)
{
        int error;

        error = vflush(mp, NULLVP, (SKIPSYSTEM | SKIPSWAP | flags));
        error = vflush(mp, NULLVP, (SKIPSYSTEM | flags));

        return (error);
}

short hfs_flushMDB(struct hfsmount *hfsmp, int waitfor)
{
        ExtendedVCB                     *vcb = HFSTOVCB(hfsmp);
        FCB                                             *fcb;
        HFSMasterDirectoryBlock *mdb;
        struct buf                              *bp;
        int                                             retval;
        int                     size = kMDBSize;        /* 512 */
        ByteCount                               namelen;

        if (vcb->vcbSigWord != kHFSSigWord)
                return EINVAL;

    DBG_ASSERT(hfsmp->hfs_devvp != NULL);

        retval = bread(hfsmp->hfs_devvp, IOBLKNOFORBLK(kMasterDirectoryBlock, size),
                                        IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, size), NOCRED, &bp);
        if (retval) {
            DBG_VFS((" hfs_flushMDB bread return error! (%d)\n", retval));
                if (bp) brelse(bp);
                return retval;
        }

    DBG_ASSERT(bp != NULL);
    DBG_ASSERT(bp->b_data != NULL);
    DBG_ASSERT(bp->b_bcount == size);

        mdb = (HFSMasterDirectoryBlock *)((char *)bp->b_data + IOBYTEOFFSETFORBLK(kMasterDirectoryBlock, size));
    
        VCB_LOCK(vcb);
        mdb->drCrDate   = SWAP_BE32 (UTCToLocal(vcb->vcbCrDate));
        mdb->drLsMod    = SWAP_BE32 (UTCToLocal(vcb->vcbLsMod));
        mdb->drAtrb             = SWAP_BE16 (vcb->vcbAtrb);
        mdb->drNmFls    = SWAP_BE16 (vcb->vcbNmFls);
        mdb->drAllocPtr = SWAP_BE16 (vcb->nextAllocation);
        mdb->drClpSiz   = SWAP_BE32 (vcb->vcbClpSiz);
        mdb->drNxtCNID  = SWAP_BE32 (vcb->vcbNxtCNID);
        mdb->drFreeBks  = SWAP_BE16 (vcb->freeBlocks);

        namelen = strlen(vcb->vcbVN);
        retval = utf8_to_hfs(vcb, namelen, vcb->vcbVN, mdb->drVN);
        /* Retry with MacRoman in case that's how it was exported. */
        if (retval)
                retval = utf8_to_mac_roman(namelen, vcb->vcbVN, mdb->drVN);
        
        mdb->drVolBkUp  = SWAP_BE32 (UTCToLocal(vcb->vcbVolBkUp));
        mdb->drVSeqNum  = SWAP_BE16 (vcb->vcbVSeqNum);
        mdb->drWrCnt    = SWAP_BE32 (vcb->vcbWrCnt);
        mdb->drNmRtDirs = SWAP_BE16 (vcb->vcbNmRtDirs);
        mdb->drFilCnt   = SWAP_BE32 (vcb->vcbFilCnt);
        mdb->drDirCnt   = SWAP_BE32 (vcb->vcbDirCnt);
        
        bcopy(vcb->vcbFndrInfo, mdb->drFndrInfo, sizeof(mdb->drFndrInfo));

        fcb = VTOFCB(vcb->extentsRefNum);
        /* HFSPlusToHFSExtents(fcb->fcbExtents, mdb->drXTExtRec); */
        mdb->drXTExtRec[0].startBlock = SWAP_BE16 (fcb->fcbExtents[0].startBlock);
        mdb->drXTExtRec[0].blockCount = SWAP_BE16 (fcb->fcbExtents[0].blockCount);
        mdb->drXTExtRec[1].startBlock = SWAP_BE16 (fcb->fcbExtents[1].startBlock);
        mdb->drXTExtRec[1].blockCount = SWAP_BE16 (fcb->fcbExtents[1].blockCount);
        mdb->drXTExtRec[2].startBlock = SWAP_BE16 (fcb->fcbExtents[2].startBlock);
        mdb->drXTExtRec[2].blockCount = SWAP_BE16 (fcb->fcbExtents[2].blockCount);
    
        mdb->drXTFlSize = SWAP_BE32 (fcb->fcbPLen);
        mdb->drXTClpSiz = SWAP_BE32 (fcb->fcbClmpSize);
        
        fcb = VTOFCB(vcb->catalogRefNum);
        /* HFSPlusToHFSExtents(fcb->fcbExtents, mdb->drCTExtRec); */
        mdb->drCTExtRec[0].startBlock = SWAP_BE16 (fcb->fcbExtents[0].startBlock);
        mdb->drCTExtRec[0].blockCount = SWAP_BE16 (fcb->fcbExtents[0].blockCount);
        mdb->drCTExtRec[1].startBlock = SWAP_BE16 (fcb->fcbExtents[1].startBlock);
        mdb->drCTExtRec[1].blockCount = SWAP_BE16 (fcb->fcbExtents[1].blockCount);
        mdb->drCTExtRec[2].startBlock = SWAP_BE16 (fcb->fcbExtents[2].startBlock);
        mdb->drCTExtRec[2].blockCount = SWAP_BE16 (fcb->fcbExtents[2].blockCount);
    
        mdb->drCTFlSize = SWAP_BE32 (fcb->fcbPLen);
        mdb->drCTClpSiz = SWAP_BE32 (fcb->fcbClmpSize);
        VCB_UNLOCK(vcb);

    if (waitfor != MNT_WAIT)
                bawrite(bp);
    else 
                retval = VOP_BWRITE(bp);
 
        MarkVCBClean( vcb );

        return (retval);
}


short hfs_flushvolumeheader(struct hfsmount *hfsmp, int waitfor)
{
    ExtendedVCB                         *vcb = HFSTOVCB(hfsmp);
    FCB                                         *fcb;
    HFSPlusVolumeHeader         *volumeHeader;
    int                                         retval;
    int                     size = sizeof(HFSPlusVolumeHeader);
    struct buf                          *bp;
    int                                         i;

        if (vcb->vcbSigWord != kHFSPlusSigWord)
                return EINVAL;

        retval = bread(hfsmp->hfs_devvp, IOBLKNOFORBLK((vcb->hfsPlusIOPosOffset / 512) + kMasterDirectoryBlock, size),
                                        IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, size), NOCRED, &bp);
        if (retval) {
            DBG_VFS((" hfs_flushvolumeheader bread return error! (%d)\n", retval));
                if (bp) brelse(bp);
                return retval;
        }

    DBG_ASSERT(bp != NULL);
    DBG_ASSERT(bp->b_data != NULL);
    DBG_ASSERT(bp->b_bcount == size);

        volumeHeader = (HFSPlusVolumeHeader *)((char *)bp->b_data +
                                        IOBYTEOFFSETFORBLK((vcb->hfsPlusIOPosOffset / 512) + kMasterDirectoryBlock, size));

        /*
         * For embedded HFS+ volumes, update create date if it changed
         * (ie from a setattrlist call)
         */
        if ((vcb->hfsPlusIOPosOffset != 0) && (SWAP_BE32 (volumeHeader->createDate) != vcb->localCreateDate))
          {
                struct buf                              *bp2;
                HFSMasterDirectoryBlock *mdb;

                retval = bread(hfsmp->hfs_devvp, IOBLKNOFORBLK(kMasterDirectoryBlock, kMDBSize),
                                                IOBYTECCNTFORBLK(kMasterDirectoryBlock, kMDBSize, kMDBSize), NOCRED, &bp2);
                if (retval != E_NONE) {
                        if (bp2) brelse(bp2);
                } else {
                        mdb = (HFSMasterDirectoryBlock *)((char *)bp2->b_data + IOBYTEOFFSETFORBLK(kMasterDirectoryBlock, kMDBSize));

                        if ( SWAP_BE32 (mdb->drCrDate) != vcb->localCreateDate )
                          {
                                mdb->drCrDate = SWAP_BE32 (vcb->localCreateDate);       /* pick up the new create date */

                                (void) VOP_BWRITE(bp2);         /* write out the changes */
                          }
                        else
                          {
                                brelse(bp2);                                            /* just release it */
                          }
                  }     
          }

        VCB_LOCK(vcb);
        /* Note: only update the lower 16 bits worth of attributes */
        volumeHeader->attributes                 =      SWAP_BE32 ((SWAP_BE32 (volumeHeader->attributes) & 0xFFFF0000) + (UInt16) vcb->vcbAtrb);
        volumeHeader->lastMountedVersion =  SWAP_BE32 (kHFSPlusMountVersion);
        volumeHeader->createDate                 =  SWAP_BE32 (vcb->localCreateDate);  /* volume create date is in local time */
        volumeHeader->modifyDate                 =  SWAP_BE32 (vcb->vcbLsMod);
        volumeHeader->backupDate                 =  SWAP_BE32 (vcb->vcbVolBkUp);
        volumeHeader->checkedDate                =  SWAP_BE32 (vcb->checkedDate);
        volumeHeader->fileCount                  =      SWAP_BE32 (vcb->vcbFilCnt);
        volumeHeader->folderCount                =      SWAP_BE32 (vcb->vcbDirCnt);
        volumeHeader->freeBlocks                 =      SWAP_BE32 (vcb->freeBlocks);
        volumeHeader->nextAllocation     =      SWAP_BE32 (vcb->nextAllocation);
        volumeHeader->rsrcClumpSize              =      SWAP_BE32 (vcb->vcbClpSiz);
        volumeHeader->dataClumpSize              =      SWAP_BE32 (vcb->vcbClpSiz);
        volumeHeader->nextCatalogID              =      SWAP_BE32 (vcb->vcbNxtCNID);
        volumeHeader->writeCount                 =      SWAP_BE32 (vcb->vcbWrCnt);
        volumeHeader->encodingsBitmap    =      SWAP_BE64 (vcb->encodingsBitmap);

        bcopy( vcb->vcbFndrInfo, volumeHeader->finderInfo, sizeof(volumeHeader->finderInfo) );

        VCB_UNLOCK(vcb);

        fcb = VTOFCB(vcb->extentsRefNum);
        /* bcopy( fcb->fcbExtents, volumeHeader->extentsFile.extents, sizeof(HFSPlusExtentRecord) ); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        volumeHeader->extentsFile.extents[i].startBlock = SWAP_BE32 (fcb->fcbExtents[i].startBlock);
        volumeHeader->extentsFile.extents[i].blockCount = SWAP_BE32 (fcb->fcbExtents[i].blockCount);
    }
    
        fcb->fcbFlags &= ~fcbModifiedMask;
        volumeHeader->extentsFile.logicalSize = SWAP_BE64 (fcb->fcbEOF);
        volumeHeader->extentsFile.totalBlocks = SWAP_BE32 (fcb->fcbPLen / vcb->blockSize);
        volumeHeader->extentsFile.clumpSize   = SWAP_BE32 (fcb->fcbClmpSize);

        fcb = VTOFCB(vcb->catalogRefNum);
        /* bcopy( fcb->fcbExtents, volumeHeader->catalogFile.extents, sizeof(HFSPlusExtentRecord) ); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        volumeHeader->catalogFile.extents[i].startBlock = SWAP_BE32 (fcb->fcbExtents[i].startBlock);
        volumeHeader->catalogFile.extents[i].blockCount = SWAP_BE32 (fcb->fcbExtents[i].blockCount);
    }
    
        fcb->fcbFlags &= ~fcbModifiedMask;
        volumeHeader->catalogFile.logicalSize = SWAP_BE64 (fcb->fcbEOF);
        volumeHeader->catalogFile.totalBlocks = SWAP_BE32 (fcb->fcbPLen / vcb->blockSize);
        volumeHeader->catalogFile.clumpSize   = SWAP_BE32 (fcb->fcbClmpSize);

        fcb = VTOFCB(vcb->allocationsRefNum);
        /* bcopy( fcb->fcbExtents, volumeHeader->allocationFile.extents, sizeof(HFSPlusExtentRecord) ); */
    for (i = 0; i < kHFSPlusExtentDensity; i++) {
        volumeHeader->allocationFile.extents[i].startBlock      = SWAP_BE32 (fcb->fcbExtents[i].startBlock);
        volumeHeader->allocationFile.extents[i].blockCount      = SWAP_BE32 (fcb->fcbExtents[i].blockCount);
    }
    
        fcb->fcbFlags &= ~fcbModifiedMask;
        volumeHeader->allocationFile.logicalSize = SWAP_BE64 (fcb->fcbEOF);
        volumeHeader->allocationFile.totalBlocks = SWAP_BE32 (fcb->fcbPLen / vcb->blockSize);
        volumeHeader->allocationFile.clumpSize   = SWAP_BE32 (fcb->fcbClmpSize);

    if (waitfor != MNT_WAIT)
        bawrite(bp);
    else 
                retval = VOP_BWRITE(bp);
 
        MarkVCBClean( vcb );

        return (retval);
}


/*
 *      Moved here to avoid having to define prototypes
 */

/*
 * hfs vfs operations.
 */
struct vfsops hfs_vfsops = {
    hfs_mount,
    hfs_start,
    hfs_unmount,
    hfs_root,
    hfs_quotactl,
    hfs_statfs,
    hfs_sync,
    hfs_vget,
    hfs_fhtovp,
    hfs_vptofh,
    hfs_init,
    hfs_sysctl
};