xnu-792.21.3.tar.gz

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

/*
 * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*
 * hfs_attrlist.c - HFS attribute list processing
 *
 * Copyright (c) 1998-2002, Apple Computer, Inc.  All Rights Reserved.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/attr.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#include <sys/mount_internal.h>
#include <sys/kauth.h>

#include <kern/locks.h>

#include "hfs.h"
#include "hfs_cnode.h"
#include "hfs_mount.h"
#include "hfs_dbg.h"
#include "hfs_attrlist.h"



/* Routines that are shared by hfs_setattr: */
extern int hfs_write_access(struct vnode *vp, kauth_cred_t cred,
                        struct proc *p, Boolean considerFlags);

extern int hfs_chflags(struct vnode *vp, uint32_t flags, kauth_cred_t cred,
                        struct proc *p);

extern int hfs_chmod(struct vnode *vp, int mode, kauth_cred_t cred,
                        struct proc *p);

extern int hfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred,
                        struct proc *p);

__private_extern__ int hfs_vnop_readdirattr(struct vnop_readdirattr_args *ap);

__private_extern__ int hfs_vnop_setattrlist(struct vnop_setattrlist_args  *ap);

__private_extern__ int hfs_vnop_getattrlist(struct vnop_getattrlist_args *ap);

/* Packing routines: */


static void packvolcommonattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct vnode *vp, struct proc *p);

static void packvolattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct vnode *vp);

static void packcommonattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct vnode *vp, struct cat_desc * cdp,
                        struct cat_attr * cap, struct proc *p);

static void packfileattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct cat_attr *cattrp, struct cat_fork *datafork,
                        struct cat_fork *rsrcfork);

static void packdirattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct vnode *vp, struct cat_desc * descp,
                        struct cat_attr * cattrp);


#if 0
static int unpackattrblk(struct attrblock *abp, struct vnode *vp);

static void unpackcommonattr(struct attrblock *abp, struct vnode *vp);

static int unpackvolattr(struct attrblock *abp, struct hfsmount *hfsmp,
                        struct vnode *root_vp);


/*
 * Get a list of attributes.
 */
__private_extern__
int
hfs_vnop_getattrlist(ap)
        struct vnop_getattrlist_args /* {
                struct vnode *a_vp;
                struct attrlist *a_alist
                struct uio *a_uio;
                int a_options;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct cnode *cp;
        struct hfsmount *hfsmp;
        struct attrlist *alist = ap->a_alist;
        proc_t p = vfs_context_proc(ap->a_context);
        int fixedblocksize;
        int attrblocksize;
        int attrbufsize;
        void *attrbufptr = NULL;
        void *attrptr;
        void *varptr;
        struct attrblock attrblk;
        struct cat_fork *datafp = NULL;
        struct cat_fork *rsrcfp = NULL;
        struct cat_fork rsrcfork;
        int lockflags;
        int error = 0;

        if ((alist->bitmapcount != ATTR_BIT_MAP_COUNT) ||
            ((alist->commonattr & ~ATTR_CMN_VALIDMASK) != 0) ||
            ((alist->volattr & ~ATTR_VOL_VALIDMASK) != 0) ||
            ((alist->dirattr & ~ATTR_DIR_VALIDMASK) != 0) ||
            ((alist->fileattr & ~ATTR_FILE_VALIDMASK) != 0)) {
                return (EINVAL);
        }

        /*
         * Requesting volume information requires setting the
         * ATTR_VOL_INFO bit. Also, volume info requests are
         * mutually exclusive with all other info requests.
         */
        if ((alist->volattr != 0) &&
            (((alist->volattr & ATTR_VOL_INFO) == 0) ||
             (alist->dirattr != 0) || (alist->fileattr != 0))) {
                return (EINVAL);
        }

        /* Reject requests for unsupported options for now: */
        if ((alist->commonattr & (ATTR_CMN_NAMEDATTRCOUNT | ATTR_CMN_NAMEDATTRLIST)) ||
            (alist->fileattr & (ATTR_FILE_FILETYPE | ATTR_FILE_FORKCOUNT | ATTR_FILE_FORKLIST))) {
                return (EINVAL);
        }

        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        cp = VTOC(vp);
        hfsmp = VTOHFS(vp);

        /* Requesting volume information requires root vnode */ 
        if ((alist->volattr) && cp->c_fileid != kHFSRootFolderID) {
                error = EINVAL;
                goto exit;
        }
        /* Asking for data fork attributes from the rsrc fork is not supported */
        if (VNODE_IS_RSRC(vp) && (alist->fileattr & ATTR_DATAFORK_MASK)) {
                error = EINVAL;
                goto exit;
        }
        /* This file no longer exists! */
        if (cp->c_flag & (C_NOEXISTS | C_DELETED)) {
                error = ENOENT;
                goto exit;
        }
        /* This file doesn't have a name! */
        if ((cp->c_desc.cd_namelen == 0) && (alist->commonattr & ATTR_CMN_NAME)) {
                error = ENOENT;
                goto exit;
        }

        /* Update cnode times if needed */
        hfs_touchtimes(hfsmp, cp);

        /*
         * If a File ID (ATTR_CMN_OBJPERMANENTID) is requested on
         * an HFS volume we must be sure to create the thread
         * record before returning it. (yikes)
         */
        if (vnode_isreg(vp) &&
            (alist->commonattr & ATTR_CMN_OBJPERMANENTID) &&
            (VTOVCB(vp)->vcbSigWord != kHFSPlusSigWord)) {

                cat_cookie_t cookie;

                if (hfsmp->hfs_flags & HFS_READ_ONLY) {
                        error = EROFS;
                        goto exit;
                }
                if ((error = hfs_write_access(vp, vfs_context_ucred(ap->a_context),
                                              p, false)) != 0) {
                        goto exit;
                }
                /*
                 * Reserve some space in the Catalog file.
                 */
                bzero(&cookie, sizeof(cookie));
                error = cat_preflight(hfsmp, CAT_CREATE, &cookie, p);
                if (error) {
                        goto exit;
                }

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);

                error = cat_insertfilethread(hfsmp, &cp->c_desc);

                hfs_systemfile_unlock(hfsmp, lockflags);

                cat_postflight(hfsmp, &cookie, p);

                if (error)
                        goto exit;
        }
        bzero(&rsrcfork, sizeof(rsrcfork));
        /* Establish known fork data */
        if (cp->c_datafork != NULL) {
                datafp = &cp->c_datafork->ff_data;
                if ((cp->c_rsrcfork == NULL) &&
                    (cp->c_blocks == datafp->cf_blocks))
                        rsrcfp = &rsrcfork;     /* rsrc fork is empty */
        }
        if (cp->c_rsrcfork != NULL)
                rsrcfp = &cp->c_rsrcfork->ff_data;
        
        /*
         * When resource fork data is requested and its not available
         * in the cnode and the fork is not empty then it needs to be
         * fetched from the catalog.
         */
        if ((alist->fileattr & ATTR_RSRCFORK_MASK) && (rsrcfp == NULL)) {

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);

                /* Get resource fork data */
                error = cat_lookup(hfsmp, &cp->c_desc, 1,
                                (struct cat_desc *)0, (struct cat_attr *)0, &rsrcfork, NULL);

                hfs_systemfile_unlock(hfsmp, lockflags);

                if (error)
                        goto exit;

                rsrcfp = &rsrcfork;
        }

        fixedblocksize = hfs_attrblksize(alist);
        attrblocksize = fixedblocksize + (sizeof(uint32_t));  /* uint32_t for length word */
        if (alist->commonattr & ATTR_CMN_NAME)
                attrblocksize += kHFSPlusMaxFileNameBytes + 1;
        if (alist->volattr & ATTR_VOL_MOUNTPOINT)
                attrblocksize += PATH_MAX;
        if (alist->volattr & ATTR_VOL_NAME)
                attrblocksize += kHFSPlusMaxFileNameBytes + 1;
#if 0
        if (alist->commonattr & ATTR_CMN_NAMEDATTRLIST)
                attrblocksize += 0;
        if (alist->fileattr & ATTR_FILE_FORKLIST)
                attrblocksize += 0;
#endif
        attrbufsize = MIN(uio_resid(ap->a_uio), attrblocksize);
        MALLOC(attrbufptr, void *, attrblocksize, M_TEMP, M_WAITOK);
        attrptr = attrbufptr;
        *((uint32_t *)attrptr) = 0;  /* Set buffer length in case of errors */
        ++((uint32_t *)attrptr);     /* Reserve space for length field */
        varptr = ((char *)attrptr) + fixedblocksize;

        attrblk.ab_attrlist = alist;
        attrblk.ab_attrbufpp = &attrptr;
        attrblk.ab_varbufpp = &varptr;
        attrblk.ab_flags = 0;
        attrblk.ab_blocksize = attrblocksize;

        hfs_packattrblk(&attrblk, hfsmp, vp, &cp->c_desc, &cp->c_attr,
                        datafp, rsrcfp, p);

        /* Don't copy out more data than was generated */
        attrbufsize = MIN((u_int)attrbufsize, (u_int)varptr - (u_int)attrbufptr);
         /* Set actual buffer length for return to caller */
        *((uint32_t *)attrbufptr) = attrbufsize;
        error = uiomove((caddr_t)attrbufptr, attrbufsize, ap->a_uio);
exit:
        if (attrbufptr)
                FREE(attrbufptr, M_TEMP);
        hfs_unlock(cp);
        return (error);
}


/*
 * Set a list of attributes.
 */
__private_extern__
int
hfs_vnop_setattrlist(ap)
        struct vnop_setattrlist_args /* {
                struct vnode *a_vp;
                struct attrlist *a_alist
                struct uio *a_uio;
                int a_options;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct cnode *cp;
        struct hfsmount * hfsmp;
        struct attrlist *alist = ap->a_alist;
        kauth_cred_t cred = vfs_context_ucred(ap->a_context);
        struct proc *p = vfs_context_proc(ap->a_context);
        int attrblocksize;
        void *attrbufptr = NULL;
        void *attrptr;
        void *varptr = NULL;
        struct attrblock attrblk;
        uid_t saved_uid;
        gid_t saved_gid;
        mode_t saved_mode;
        uint32_t saved_flags;
        int error = 0;

        hfsmp = VTOHFS(vp);

        if (hfsmp->hfs_flags & HFS_READ_ONLY)
                return (EROFS);
        if ((alist->bitmapcount != ATTR_BIT_MAP_COUNT)     ||
            ((alist->commonattr & ~ATTR_CMN_SETMASK) != 0) ||
            ((alist->volattr & ~ATTR_VOL_SETMASK) != 0)    ||
            ((alist->dirattr & ~ATTR_DIR_SETMASK) != 0)    ||
            ((alist->fileattr & ~ATTR_FILE_SETMASK) != 0)) {
                return (EINVAL);
        }
        if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        cp = VTOC(vp);

        /* 
         * When setting volume attributes make sure
         * that ATTR_VOL_INFO is set and that all
         * the attributes are valid.
         */
        if ((alist->volattr != 0) &&
            (((alist->volattr & ATTR_VOL_INFO) == 0) ||
            (alist->commonattr & ~ATTR_CMN_VOLSETMASK) ||
            (cp->c_fileid != kHFSRootFolderID))) {
                if ((alist->volattr & ATTR_VOL_INFO) == 0)
                        printf("hfs_setattrlist: you forgot to set ATTR_VOL_INFO bit!\n");
                else
                        printf("hfs_setattrlist: you cannot set bits 0x%08X!\n",
                                alist->commonattr & ~ATTR_CMN_VOLSETMASK);
                error = EINVAL;
                goto ErrorExit;
        }
        if (cp->c_flag & (C_NOEXISTS | C_DELETED)) {
                error = ENOENT;
                goto ErrorExit;
        }
        // XXXdbg - don't allow modifying the journal or journal_info_block
        if (hfsmp->jnl && cp->c_datafork) {
                struct HFSPlusExtentDescriptor *extd;
                
                extd = &cp->c_datafork->ff_extents[0];
                if (extd->startBlock == HFSTOVCB(hfsmp)->vcbJinfoBlock || extd->startBlock == hfsmp->jnl_start) {
                        error = EPERM;
                        goto ErrorExit;
                }
        }

        /*
         * Ownership of a file is required in one of two classes of calls:
         *
         * (a) When setting any ownership-requiring attribute other
         *     than ATTR_CMN_FLAGS, or
         * (b) When setting ATTR_CMN_FLAGS on a volume that's not
         *     plain HFS (for which no real per-object ownership
         *     information is stored)
         */
        if ((alist->commonattr & (ATTR_OWNERSHIP_SETMASK & ~ATTR_CMN_FLAGS)) ||
            ((alist->commonattr & ATTR_CMN_FLAGS) &&
             (VTOVCB(vp)->vcbSigWord != kHFSSigWord))) {
                /*
                 * NOTE: The following isn't ENTIRELY complete: even if
                 * you're the superuser you cannot change the flags as
                 * long as SF_IMMUTABLE or SF_APPEND is set and the
                 * securelevel > 0.  This is verified in hfs_chflags
                 * which gets invoked to do the actual flags field
                 * change so this check is sufficient for now.
                 */
                if ((error = hfs_owner_rights(hfsmp, cp->c_uid, cred, p, true)) != 0)
                        goto ErrorExit;
        }
        /*
         * For any other attributes, check to see if the user has
         * write access to the cnode in question [unlike vn_access,
         * ignore IMMUTABLE here]:
         */ 
        if (((alist->commonattr & ~ATTR_OWNERSHIP_SETMASK) != 0) ||
            (alist->volattr != 0) || (alist->dirattr != 0) ||
            (alist->fileattr != 0)) {
                if ((error = hfs_write_access(vp, cred, p, false)) != 0)
                        goto ErrorExit;
        }

        /*
         * Allocate the buffer now to minimize the time we might
         * be blocked holding the catalog lock.
         */
        // LP64todo - fix this
        attrblocksize = uio_resid(ap->a_uio);
        if (attrblocksize < hfs_attrblksize(alist)) {
                error = EINVAL;
                goto ErrorExit;
        }

        MALLOC(attrbufptr, void *, attrblocksize, M_TEMP, M_WAITOK);

        error = uiomove((caddr_t)attrbufptr, attrblocksize, ap->a_uio);
        if (error)
                goto ErrorExit;

        /* Save original state so changes can be detected. */
        saved_uid = cp->c_uid;
        saved_gid = cp->c_gid;
        saved_mode = cp->c_mode;
        saved_flags = cp->c_flags;

        attrptr = attrbufptr;
        attrblk.ab_attrlist = alist;
        attrblk.ab_attrbufpp = &attrptr;
        attrblk.ab_varbufpp = &varptr;
        attrblk.ab_flags = 0;
        attrblk.ab_blocksize = attrblocksize;
        error = unpackattrblk(&attrblk, vp);
        if (error)
                goto ErrorExit;

        /* If unpacking changed the owner/group then call hfs_chown() */
        if ((saved_uid != cp->c_uid) || (saved_gid != cp->c_gid)) {
                uid_t uid;
                gid_t gid;
                
                uid = cp->c_uid;
                cp->c_uid = saved_uid;
                gid = cp->c_gid;
                cp->c_gid = saved_gid;
                if ((error = hfs_chown(vp, uid, gid, cred, p)))
                        goto ErrorExit;
        }
        /* If unpacking changed the mode then call hfs_chmod() */
        if (saved_mode != cp->c_mode) {
                mode_t mode;

                mode = cp->c_mode;
                cp->c_mode = saved_mode;
                if ((error = hfs_chmod(vp, mode, cred, p)))
                        goto ErrorExit;
        }
        /* If unpacking changed the flags then call hfs_chflags() */
        if (saved_flags !=cp->c_flags) {
                uint32_t flags;

                flags = cp->c_flags;
                cp->c_flags = saved_flags;
                if ((error = hfs_chflags(vp, flags, cred, p)))
                        goto ErrorExit;
        }
        /*
         * If any cnode attributes changed then do an update.
         */
        if (alist->volattr == 0) {
                cp->c_flag |= C_MODIFIED;
                if ((error = hfs_update(vp, TRUE))) {
                        goto ErrorExit;
                }
        }
        /* Volume Rename */
        if (alist->volattr & ATTR_VOL_NAME) {
                ExtendedVCB *vcb = VTOVCB(vp);
        
                if (vcb->vcbVN[0] == 0) {
                        /*
                         * Ignore attempts to rename a volume to a zero-length name:
                         * restore the original name from the cnode.
                         */
                        copystr(cp->c_desc.cd_nameptr, vcb->vcbVN, sizeof(vcb->vcbVN), NULL);
                } else {
                        struct cat_desc to_desc;
                        struct cat_desc todir_desc;
                        struct cat_desc new_desc;
                        cat_cookie_t cookie;
                        int catreserve = 0;
                        int catlocked = 0;
                        int started_tr = 0;
                        int lockflags;

                        bzero(&to_desc, sizeof(to_desc));
                        bzero(&todir_desc, sizeof(todir_desc));
                        bzero(&new_desc, sizeof(new_desc));
                        bzero(&cookie, sizeof(cookie));

                        todir_desc.cd_parentcnid = kHFSRootParentID;
                        todir_desc.cd_cnid = kHFSRootFolderID;
                        todir_desc.cd_flags = CD_ISDIR;

                        to_desc.cd_nameptr = vcb->vcbVN;
                        to_desc.cd_namelen = strlen(vcb->vcbVN);
                        to_desc.cd_parentcnid = kHFSRootParentID;
                        to_desc.cd_cnid = cp->c_cnid;
                        to_desc.cd_flags = CD_ISDIR;

                        if ((error = hfs_start_transaction(hfsmp) != 0)) {
                            goto rename_out;
                        }
                        started_tr = 1;

                        /*
                         * Reserve some space in the Catalog file.
                         */
                        error = cat_preflight(hfsmp, CAT_RENAME, &cookie, p);
                        if (error) {
                                goto rename_out;
                        }
                        catreserve = 1;

                        lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_EXCLUSIVE_LOCK);
                        catlocked = 1;

                        error = cat_rename(hfsmp, &cp->c_desc, &todir_desc, &to_desc, &new_desc);
rename_out:                     
                        if (catlocked) {
                                hfs_systemfile_unlock(hfsmp, lockflags);
                        }
                        if (catreserve) {
                                cat_postflight(hfsmp, &cookie, p);
                        }
                        (void) hfs_flushvolumeheader(hfsmp, MNT_WAIT, 0);
                        if (started_tr) {
                            hfs_end_transaction(hfsmp);
                        }
                        
                        if (error) {
                                /* Restore the old name in the VCB */
                                copystr(cp->c_desc.cd_nameptr, vcb->vcbVN, sizeof(vcb->vcbVN), NULL);
                                vcb->vcbFlags |= 0xFF00;
                                goto ErrorExit;
                        }
                        /* Release old allocated name buffer */
                        if (cp->c_desc.cd_flags & CD_HASBUF) {
                                char *name = cp->c_desc.cd_nameptr;
                
                                cp->c_desc.cd_nameptr = 0;
                                cp->c_desc.cd_namelen = 0;
                                cp->c_desc.cd_flags &= ~CD_HASBUF;
                                vfs_removename(name);
                        }                       
                        /* Update cnode's catalog descriptor */
                        replace_desc(cp, &new_desc);
                        vcb->volumeNameEncodingHint = new_desc.cd_encoding;
                        cp->c_touch_chgtime = TRUE;
                }
        }

        /*
         * When the volume name changes or the volume's finder info
         * changes then force them to disk immediately.
         */
        if ((alist->volattr & ATTR_VOL_INFO) &&
            ((alist->volattr & ATTR_VOL_NAME) ||
             (alist->commonattr & ATTR_CMN_FNDRINFO))) {
                (void) hfs_flushvolumeheader(hfsmp, MNT_WAIT, 0);
        }
ErrorExit:
        if (attrbufptr)
                FREE(attrbufptr, M_TEMP);

        hfs_unlock(cp);
        return (error);
}
#endif

/*
 * readdirattr operation will return attributes for the items in the
 * directory specified. 
 *
 * It does not do . and .. entries. The problem is if you are at the root of the
 * hfs directory and go to .. you could be crossing a mountpoint into a
 * different (ufs) file system. The attributes that apply for it may not 
 * apply for the file system you are doing the readdirattr on. To make life 
 * simpler, this call will only return entries in its directory, hfs like.
 * TO DO LATER: 
 * 1. more than one for uiovcnt support.
 * 2. put knohint (hints) in state for next call in
 * 3. credentials checking when rest of hfs does it.
 * 4. Do return permissions concatenation ???
 */

/*                      
#
#% readdirattr  vp      L L L
#
vnop_readdirattr {
        IN struct vnode *vp;
        IN struct attrlist *alist;
        INOUT struct uio *uio;
        IN u_long maxcount:
        IN u_long options;
        OUT u_long *newstate;
        OUT int *eofflag;
        OUT u_long *actualCount;
        OUT u_long **cookies;
        IN kauth_cred_t cred;
};
*/
__private_extern__
int
hfs_vnop_readdirattr(ap)
        struct vnop_readdirattr_args /* {
                struct vnode *a_vp;
                struct attrlist *a_alist;
                struct uio *a_uio;
                u_long a_maxcount;
                u_long a_options;
                u_long *a_newstate;
                int *a_eofflag;
                u_long *a_actualcount;
                vfs_context_t a_context;
        } */ *ap;
{
        struct vnode *dvp = ap->a_vp;
        struct cnode *dcp;
        struct hfsmount * hfsmp;
        struct attrlist *alist = ap->a_alist;
        uio_t uio = ap->a_uio;
        int maxcount = ap->a_maxcount;
        struct proc *p = vfs_context_proc(ap->a_context);
        uint32_t fixedblocksize;
        uint32_t maxattrblocksize;
        uint32_t currattrbufsize;
        void *attrbufptr = NULL;
        void *attrptr;
        void *varptr;
        struct attrblock attrblk;
        int error = 0;
        int depleted = 0;
        int index;
        int i, dir_entries;
        struct cat_desc *lastdescp = NULL;
        struct cat_entrylist *ce_list = NULL;
        directoryhint_t *dirhint = NULL;
        unsigned int tag;
        int shared_cnode_lock = 0;

        *(ap->a_actualcount) = 0;
        *(ap->a_eofflag) = 0;

        /* Check for invalid options and buffer space. */
        if (((ap->a_options & ~(FSOPT_NOINMEMUPDATE | FSOPT_NOFOLLOW)) != 0)
        ||  (uio_resid(uio) <= 0) || (uio_iovcnt(uio) > 1) || (maxcount <= 0))
                return (EINVAL);

        /* This call doesn't take volume attributes. */
        if ((alist->bitmapcount != ATTR_BIT_MAP_COUNT) ||
            ((alist->commonattr & ~ATTR_CMN_VALIDMASK) != 0) ||
            (alist->volattr  != 0) ||
            ((alist->dirattr & ~ATTR_DIR_VALIDMASK) != 0) ||
            ((alist->fileattr & ~ATTR_FILE_VALIDMASK) != 0)) 
                return (EINVAL);

        if ((error = hfs_lock(VTOC(dvp), HFS_EXCLUSIVE_LOCK)))
                return (error);
        dcp = VTOC(dvp);
        hfsmp = VTOHFS(dvp);

        /* Reject requests for unsupported options. */
        if ((alist->commonattr & (ATTR_CMN_NAMEDATTRCOUNT | ATTR_CMN_NAMEDATTRLIST |
             ATTR_CMN_OBJPERMANENTID)) ||
            (alist->fileattr & (ATTR_FILE_FILETYPE | ATTR_FILE_FORKCOUNT |
             ATTR_FILE_FORKLIST | ATTR_FILE_DATAEXTENTS | ATTR_FILE_RSRCEXTENTS))) {
                printf("readdirattr: unsupported attributes! (%s)\n", dcp->c_desc.cd_nameptr);
                error = EINVAL;
                goto exit;
        }

        dir_entries = dcp->c_entries;
        if (dcp->c_attr.ca_fileid == kHFSRootFolderID && (hfsmp->jnl || ((HFSTOVCB(hfsmp)->vcbAtrb & kHFSVolumeJournaledMask) && (hfsmp->hfs_flags & HFS_READ_ONLY)))) {
                dir_entries -= 3;
        }

        /* Convert uio_offset into a directory index. */
        index = uio_offset(uio) & HFS_INDEX_MASK;
        tag = uio_offset(uio) & ~HFS_INDEX_MASK;
        if ((index + 1) > dir_entries) {
                *(ap->a_eofflag) = 1;
                error = 0;
                goto exit;
        }

        /* Get a buffer to hold packed attributes. */
        fixedblocksize = (sizeof(uint32_t) + hfs_attrblksize(alist)); /* 4 bytes for length */
        maxattrblocksize = fixedblocksize;
        if (alist->commonattr & ATTR_CMN_NAME) 
                maxattrblocksize += kHFSPlusMaxFileNameBytes + 1;
        MALLOC(attrbufptr, void *, maxattrblocksize, M_TEMP, M_WAITOK);
        attrptr = attrbufptr;
        varptr = (char *)attrbufptr + fixedblocksize;  /* Point to variable-length storage */

        /* Initialize a catalog entry list. */
        MALLOC(ce_list, struct cat_entrylist *, sizeof(*ce_list), M_TEMP, M_WAITOK);
        bzero(ce_list, sizeof(*ce_list));
        ce_list->maxentries = MAXCATENTRIES;

        /* Get a directory hint (cnode must be locked exclusive) */     
        dirhint = hfs_getdirhint(dcp, ((index - 1) & HFS_INDEX_MASK) | tag);

        /* Hide tag from catalog layer. */
        dirhint->dh_index &= HFS_INDEX_MASK;
        if (dirhint->dh_index == HFS_INDEX_MASK) {
                dirhint->dh_index = -1;
        }

        /*
         * An ATTR_CMN_USERACCESS attribute request can result in a
         * call to kauth_cred_ismember_gid().  So when requesting
         * this attribute we downgrade our exclusive lock on dcp to
         * a shared lock in case kauth_cred_ismember_gid generates
         * an indirect call back into the file system.
         */
        if (alist->commonattr & ATTR_CMN_USERACCESS) {
                lck_rw_lock_exclusive_to_shared(&dcp->c_rwlock);
                dcp->c_lockowner = HFS_SHARED_OWNER;
                shared_cnode_lock = 1;
        }
        /*
         * Obtain a list of catalog entries and pack their attributes until
         * the output buffer is full or maxcount entries have been packed.
         */
        while (!depleted) {
                int maxentries;
                int lockflags;

                /* Constrain our list size. */
                maxentries = uio_resid(uio) / (fixedblocksize + HFS_AVERAGE_NAME_SIZE);
                maxentries = min(maxentries, dcp->c_entries - index);
                maxentries = min(maxentries, maxcount);
                ce_list->maxentries = min(maxentries, ce_list->maxentries);
                lastdescp = NULL;

                lockflags = hfs_systemfile_lock(hfsmp, SFL_CATALOG, HFS_SHARED_LOCK);
                 
                error = cat_getentriesattr(hfsmp, dirhint, ce_list);
                /* Don't forget to release the descriptors later! */

                hfs_systemfile_unlock(hfsmp, lockflags);
 
                if (error == ENOENT) {
                        *(ap->a_eofflag) = TRUE;
                        error = 0;
                        depleted = 1;
                }
                if (error)
                        break;
 
                /* Process the catalog entries. */
                for (i = 0; i < (int)ce_list->realentries; ++i) {
                        struct cnode *cp = NULL;
                        struct vnode *vp = NULL;
                        struct cat_desc * cdescp;
                        struct cat_attr * cattrp;
                        struct cat_fork c_datafork;
                        struct cat_fork c_rsrcfork;

                        bzero(&c_datafork, sizeof(c_datafork));
                        bzero(&c_rsrcfork, sizeof(c_rsrcfork));
                        cdescp = &ce_list->entry[i].ce_desc;
                        cattrp = &ce_list->entry[i].ce_attr;
                        c_datafork.cf_size   = ce_list->entry[i].ce_datasize;
                        c_datafork.cf_blocks = ce_list->entry[i].ce_datablks;
                        c_rsrcfork.cf_size   = ce_list->entry[i].ce_rsrcsize;
                        c_rsrcfork.cf_blocks = ce_list->entry[i].ce_rsrcblks;
                        /*
                         * Get in memory cnode data (if any).
                         */
                        if (!(ap->a_options & FSOPT_NOINMEMUPDATE)) {
                                vp = hfs_chash_getvnode(dcp->c_dev, cattrp->ca_fileid, 0, 0);

                                if (vp != NULL) {
                                        cp = VTOC(vp);
                                        /* Only use cnode's decriptor for non-hardlinks */
                                        if (!(cp->c_flag & C_HARDLINK))
                                                cdescp = &cp->c_desc;
                                        cattrp = &cp->c_attr;
                                        if (cp->c_datafork) {
                                                c_datafork.cf_size   = cp->c_datafork->ff_size;
                                                c_datafork.cf_blocks = cp->c_datafork->ff_blocks;
                                        }
                                        if (cp->c_rsrcfork) {
                                                c_rsrcfork.cf_size   = cp->c_rsrcfork->ff_size;
                                                c_rsrcfork.cf_blocks = cp->c_rsrcfork->ff_blocks;
                                        }
                                }
                        }
                        *((uint32_t *)attrptr)++ = 0; /* move it past length */
                        attrblk.ab_attrlist = alist;
                        attrblk.ab_attrbufpp = &attrptr;
                        attrblk.ab_varbufpp = &varptr;
                        attrblk.ab_flags = 0;
                        attrblk.ab_blocksize = maxattrblocksize;

                        /* Pack catalog entries into attribute buffer. */
                        hfs_packattrblk(&attrblk, hfsmp, vp, cdescp, cattrp,
                                        &c_datafork, &c_rsrcfork, p);
                        currattrbufsize = ((char *)varptr - (char *)attrbufptr);
                
                        /* All done with cnode. */
                        if (vp != NULL) {
                                hfs_unlock(VTOC(vp));
                                vnode_put(vp);
                                vp = NULL;
                                cp = NULL;
                        }

                        /* Make sure there's enough buffer space remaining. */
                        // LP64todo - fix this!
                        if (uio_resid(uio) < 0 || currattrbufsize > (uint32_t)uio_resid(uio)) {
                                depleted = 1;
                                break;
                        } else {
                                *((uint32_t *)attrbufptr) = currattrbufsize;
                                error = uiomove((caddr_t)attrbufptr, currattrbufsize, ap->a_uio);
                                if (error != E_NONE) {
                                        depleted = 1;
                                        break;
                                }
                                attrptr = attrbufptr;
                                varptr = (char *)attrbufptr + fixedblocksize;  /* Point to variable-length storage */
                                /* Save the last valid catalog entry */
                                lastdescp = &ce_list->entry[i].ce_desc;
                                index++;
                                *ap->a_actualcount += 1;

                                /* Termination checks */
                                if ((--maxcount <= 0) ||
                                        // LP64todo - fix this!
                                        uio_resid(uio) < 0 ||
                                    ((uint32_t)uio_resid(uio) < (fixedblocksize + HFS_AVERAGE_NAME_SIZE)) ||
                                    (index >= dir_entries)) {
                                        depleted = 1;
                                        break;
                                }
                        }
                } /* for each catalog entry */

                /* If there are more entries then save the last name. */
                if (index < dir_entries
                &&  !(*(ap->a_eofflag))
                &&  lastdescp != NULL) {

                        /* Remember last entry */
                        if (dirhint->dh_desc.cd_nameptr != NULL) {
                                vfs_removename(dirhint->dh_desc.cd_nameptr);
                        }
                        dirhint->dh_desc.cd_namelen = lastdescp->cd_namelen;
                        dirhint->dh_desc.cd_nameptr =
                                vfs_addname(lastdescp->cd_nameptr, lastdescp->cd_namelen, 0, 0);
                        dirhint->dh_index = index - 1;
                        dirhint->dh_desc.cd_cnid = lastdescp->cd_cnid;
                        dirhint->dh_desc.cd_hint = lastdescp->cd_hint;
                        dirhint->dh_desc.cd_encoding = lastdescp->cd_encoding;
                }
                        
                /* All done with the catalog descriptors. */
                for (i = 0; i < (int)ce_list->realentries; ++i)
                        cat_releasedesc(&ce_list->entry[i].ce_desc);
                ce_list->realentries = 0;

        } /* while not depleted */

        *ap->a_newstate = dcp->c_mtime;

        /* Make sure dcp is locked exclusive before changing c_dirhinttag. */
        if (shared_cnode_lock) {
                /*
                 * If the upgrade fails we loose the lock and
                 * have to take the exclusive lock on our own.
                 */
                if (lck_rw_lock_shared_to_exclusive(&dcp->c_rwlock) != 0)
                        lck_rw_lock_exclusive(&dcp->c_rwlock);
                dcp->c_lockowner = current_thread();
                shared_cnode_lock = 0;
        }

        /* Convert directory index back into a uio_offset. */
        while (tag == 0) tag = (++dcp->c_dirhinttag) << HFS_INDEX_BITS; 
        uio_setoffset(uio, index | tag);
        dirhint->dh_index |= tag;

exit:
        /* Drop directory hint on error or if there are no more entries */
        if (dirhint && (error || index >= dir_entries)) {
                if (shared_cnode_lock) {
                        /*
                         * If the upgrade fails we loose the lock and
                         * have to take the exclusive lock on our own.
                         */
                        if (lck_rw_lock_shared_to_exclusive(&dcp->c_rwlock) != 0)
                                lck_rw_lock_exclusive(&dcp->c_rwlock);
                        dcp->c_lockowner = current_thread();
                }
                hfs_reldirhint(dcp, dirhint);
        }
        if (attrbufptr)
                FREE(attrbufptr, M_TEMP);
        if (ce_list)
                FREE(ce_list, M_TEMP);
                
        hfs_unlock(dcp);
        return (error);
}


/*==================== Attribute list support routines ====================*/

/*
 * Pack cnode attributes into an attribute block.
 */
 __private_extern__
void
hfs_packattrblk(struct attrblock *abp,
                struct hfsmount *hfsmp,
                struct vnode *vp,
                struct cat_desc *descp,
                struct cat_attr *attrp,
                struct cat_fork *datafork,
                struct cat_fork *rsrcfork,
                struct proc *p)
{
        struct attrlist *attrlistp = abp->ab_attrlist;

        if (attrlistp->volattr) {
                if (attrlistp->commonattr)
                        packvolcommonattr(abp, hfsmp, vp, p);

                if (attrlistp->volattr & ~ATTR_VOL_INFO)
                        packvolattr(abp, hfsmp, vp);
        } else {
                if (attrlistp->commonattr)
                        packcommonattr(abp, hfsmp, vp, descp, attrp, p);
        
                if (attrlistp->dirattr && S_ISDIR(attrp->ca_mode))
                        packdirattr(abp, hfsmp, vp, descp,attrp);
        
                if (attrlistp->fileattr && !S_ISDIR(attrp->ca_mode))
                        packfileattr(abp, hfsmp, attrp, datafork, rsrcfork);
        }
}


static char*
mountpointname(struct mount *mp)
{
        size_t namelength = strlen(mp->mnt_vfsstat.f_mntonname);
        int foundchars = 0;
        char *c;
        
        if (namelength == 0)
                return (NULL);
        
        /*
         * Look backwards through the name string, looking for
         * the first slash encountered (which must precede the
         * last part of the pathname).
         */
        for (c = mp->mnt_vfsstat.f_mntonname + namelength - 1;
             namelength > 0; --c, --namelength) {
                if (*c != '/') {
                        foundchars = 1;
                } else if (foundchars) {
                        return (c + 1);
                }
        }
        
        return (mp->mnt_vfsstat.f_mntonname);
}


static void
packnameattr(
        struct attrblock *abp,
        struct vnode *vp,
        char *name,
        int namelen)
{
        void *varbufptr;
        struct attrreference * attr_refptr;
        char *mpname;
        size_t mpnamelen;
        uint32_t attrlength;
        char empty = 0;
        
        /* A cnode's name may be incorrect for the root of a mounted
         * filesystem (it can be mounted on a different directory name
         * than the name of the volume, such as "blah-1").  So for the
         * root directory, it's best to return the last element of the
         location where the volume's mounted:
         */
        if ((vp != NULL) && vnode_isvroot(vp) &&
            (mpname = mountpointname(vnode_mount(vp)))) {
                mpnamelen = strlen(mpname);
                
                /* Trim off any trailing slashes: */
                while ((mpnamelen > 0) && (mpname[mpnamelen-1] == '/'))
                        --mpnamelen;

                /* If there's anything left, use it instead of the volume's name */
                if (mpnamelen > 0) {
                        name = mpname;
                        namelen = mpnamelen;
                }
        }
        if (name == NULL) {
                name = &empty;
                namelen = 0;
        }

        varbufptr = *abp->ab_varbufpp;
        attr_refptr = (struct attrreference *)(*abp->ab_attrbufpp);

        attrlength = namelen + 1;
        attr_refptr->attr_dataoffset = (char *)varbufptr - (char *)attr_refptr;
        attr_refptr->attr_length = attrlength;
        (void) strncpy((unsigned char *)varbufptr, name, attrlength);
        /*
         * Advance beyond the space just allocated and
         * round up to the next 4-byte boundary:
         */
        (char *)(varbufptr) += attrlength + ((4 - (attrlength & 3)) & 3);
        ++attr_refptr;

        *abp->ab_attrbufpp = attr_refptr;
        *abp->ab_varbufpp = varbufptr;
}

/*
 * Pack common volume attributes.
 */
static void
packvolcommonattr(struct attrblock *abp, struct hfsmount *hfsmp, struct vnode *vp, struct proc *p)
{
        attrgroup_t attr;
        void *attrbufptr = *abp->ab_attrbufpp;
        void *varbufptr = *abp->ab_varbufpp;
        struct cnode *cp = VTOC(vp);
        struct mount *mp = VTOVFS(vp);
        ExtendedVCB *vcb = HFSTOVCB(hfsmp);
        u_int32_t attrlength;
        boolean_t is_64_bit = proc_is64bit(p);

        attr = abp->ab_attrlist->commonattr;

        if (ATTR_CMN_NAME & attr) {
                packnameattr(abp, vp, cp->c_desc.cd_nameptr, cp->c_desc.cd_namelen);
                attrbufptr = *abp->ab_attrbufpp;
                varbufptr = *abp->ab_varbufpp;
        }
        if (ATTR_CMN_DEVID & attr) {
                *((dev_t *)attrbufptr)++ = hfsmp->hfs_raw_dev;
        }
        if (ATTR_CMN_FSID & attr) {
                fsid_t fsid;
                
                fsid.val[0] = (long)hfsmp->hfs_raw_dev;
                fsid.val[1] = (long)vfs_typenum(mp);
                *((fsid_t *)attrbufptr) = fsid;
                ++((fsid_t *)attrbufptr);
        }
        if (ATTR_CMN_OBJTYPE & attr) {
                *((fsobj_type_t *)attrbufptr)++ = 0;
        }
        if (ATTR_CMN_OBJTAG & attr) {
                *((fsobj_tag_t *)attrbufptr)++ = VT_HFS;
        }
        if (ATTR_CMN_OBJID & attr)      {
                ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_OBJPERMANENTID & attr) {
                ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_PAROBJID & attr) {
                ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_SCRIPT & attr) {
                uint32_t encoding;
 
                if (vcb->vcbSigWord == kHFSPlusSigWord)
                        encoding = vcb->volumeNameEncodingHint;
                else
                        encoding = hfsmp->hfs_encoding;
                *((text_encoding_t *)attrbufptr)++ = encoding;
        }
        if (ATTR_CMN_CRTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = vcb->vcbCrDate;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = vcb->vcbCrDate;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_MODTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_CHGTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_ACCTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = vcb->vcbLsMod;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_BKUPTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = vcb->vcbVolBkUp;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = vcb->vcbVolBkUp;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_FNDRINFO & attr) {
                bcopy (&vcb->vcbFndrInfo, attrbufptr, sizeof(vcb->vcbFndrInfo));
                (char *)attrbufptr += sizeof(vcb->vcbFndrInfo);
        }
        if (ATTR_CMN_OWNERID & attr) {
                if (cp->c_uid == UNKNOWNUID)
                        *((uid_t *)attrbufptr)++ = kauth_cred_getuid(proc_ucred(p));
                else
                        *((uid_t *)attrbufptr)++ = cp->c_uid;
        }
        if (ATTR_CMN_GRPID & attr) {
                *((gid_t *)attrbufptr)++ = cp->c_gid;
        }

        if (ATTR_CMN_ACCESSMASK & attr) {
                /*
                 * [2856576]  Since we are dynamically changing the owner, also
                 * effectively turn off the set-user-id and set-group-id bits,
                 * just like chmod(2) would when changing ownership.  This prevents
                 * a security hole where set-user-id programs run as whoever is
                 * logged on (or root if nobody is logged in yet!)
                 */
                *((uint32_t *)attrbufptr)++ =
                        (cp->c_uid == UNKNOWNUID) ? cp->c_mode & ~(S_ISUID | S_ISGID) : cp->c_mode;
        }
        if (ATTR_CMN_NAMEDATTRCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = 0;        /* XXX PPD TBC */
        }
        if (ATTR_CMN_NAMEDATTRLIST & attr) {
                attrlength = 0;
                ((struct attrreference *)attrbufptr)->attr_dataoffset = 0;
                ((struct attrreference *)attrbufptr)->attr_length = attrlength;
                /*
                 * Advance beyond the space just allocated and
                 * round up to the next 4-byte boundary:
                 */
                (char *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
                ++((struct attrreference *)attrbufptr);
        }
        if (ATTR_CMN_FLAGS & attr) {
                *((uint32_t *)attrbufptr)++ = cp->c_flags;
        }
        if (ATTR_CMN_USERACCESS & attr) {
                *((uint32_t *)attrbufptr)++ =
                        DerivePermissionSummary(cp->c_uid, cp->c_gid, cp->c_mode,
                                VTOVFS(vp), kauth_cred_get(), proc_self());
        }

        *abp->ab_attrbufpp = attrbufptr;
        *abp->ab_varbufpp = varbufptr;
}


static void
packvolattr(struct attrblock *abp, struct hfsmount *hfsmp, struct vnode *vp)
{
        attrgroup_t attr;
        void *attrbufptr = *abp->ab_attrbufpp;
        void *varbufptr = *abp->ab_varbufpp;
        struct cnode *cp = VTOC(vp);
        struct mount *mp = VTOVFS(vp);
        ExtendedVCB *vcb = HFSTOVCB(hfsmp);
        uint32_t attrlength;

        attr = abp->ab_attrlist->volattr;

        if (ATTR_VOL_FSTYPE & attr) {
                *((uint32_t *)attrbufptr)++ = (uint32_t)vfs_typenum(mp);
        }
        if (ATTR_VOL_SIGNATURE & attr) {
                *((uint32_t *)attrbufptr)++ = (uint32_t)vcb->vcbSigWord;
        }
        if (ATTR_VOL_SIZE & attr) {
                *((off_t *)attrbufptr)++ =
                                (off_t)vcb->totalBlocks * (off_t)vcb->blockSize;
        }
        if (ATTR_VOL_SPACEFREE & attr) {
                *((off_t *)attrbufptr)++ = (off_t)hfs_freeblks(hfsmp, 0) *
                                           (off_t)vcb->blockSize;
        }
        if (ATTR_VOL_SPACEAVAIL & attr) {
                *((off_t *)attrbufptr)++ = (off_t)hfs_freeblks(hfsmp, 1) *
                                           (off_t)vcb->blockSize;
        }
        if (ATTR_VOL_MINALLOCATION & attr) {
                *((off_t *)attrbufptr)++ = (off_t)vcb->blockSize;
        }
        if (ATTR_VOL_ALLOCATIONCLUMP & attr) {
                *((off_t *)attrbufptr)++ = (off_t)(vcb->vcbClpSiz);
        }
        if (ATTR_VOL_IOBLOCKSIZE & attr) {
        *((uint32_t *)attrbufptr)++ = hfsmp->hfs_logBlockSize;
        }
        if (ATTR_VOL_OBJCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = 
                    (uint32_t)vcb->vcbFilCnt + (uint32_t)vcb->vcbDirCnt;
        }
        if (ATTR_VOL_FILECOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = (uint32_t)vcb->vcbFilCnt;
        }
        if (ATTR_VOL_DIRCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = (uint32_t)vcb->vcbDirCnt;
        }
        if (ATTR_VOL_MAXOBJCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = 0xFFFFFFFF;
        }
        if (ATTR_VOL_MOUNTPOINT & attr) {
                ((struct attrreference *)attrbufptr)->attr_dataoffset =
                                (char *)varbufptr - (char *)attrbufptr;
                ((struct attrreference *)attrbufptr)->attr_length =
                                strlen(mp->mnt_vfsstat.f_mntonname) + 1;
                attrlength = ((struct attrreference *)attrbufptr)->attr_length;
                /* round up to the next 4-byte boundary: */
                attrlength = attrlength + ((4 - (attrlength & 3)) & 3);
                (void) bcopy(mp->mnt_vfsstat.f_mntonname, varbufptr, attrlength);
                        
                /* Advance beyond the space just allocated: */
                (char *)varbufptr += attrlength;
                ++((struct attrreference *)attrbufptr);
        }
        if (ATTR_VOL_NAME & attr) {
                ((struct attrreference *)attrbufptr)->attr_dataoffset =
                                (char *)varbufptr - (char *)attrbufptr;
                ((struct attrreference *)attrbufptr)->attr_length =
                                cp->c_desc.cd_namelen + 1;
                attrlength = ((struct attrreference *)attrbufptr)->attr_length;
                /* round up to the next 4-byte boundary: */
                attrlength = attrlength + ((4 - (attrlength & 3)) & 3);
                /* XXX this could read off the end of cd_nameptr! */
                bcopy(cp->c_desc.cd_nameptr, varbufptr, attrlength);

                /* Advance beyond the space just allocated: */
                (char *)varbufptr += attrlength;
                ++((struct attrreference *)attrbufptr);
        }
    if (ATTR_VOL_MOUNTFLAGS & attr) {
        *((uint32_t *)attrbufptr)++ = (uint32_t)vfs_flags(mp);
    }
        if (ATTR_VOL_MOUNTEDDEVICE & attr) {
                ((struct attrreference *)attrbufptr)->attr_dataoffset =
                                (char *)varbufptr - (char *)attrbufptr;
                ((struct attrreference *)attrbufptr)->attr_length =
                                strlen(mp->mnt_vfsstat.f_mntfromname) + 1;
                attrlength = ((struct attrreference *)attrbufptr)->attr_length;
                /* round up to the next 4-byte boundary: */
                attrlength = attrlength + ((4 - (attrlength & 3)) & 3);
                (void) bcopy(mp->mnt_vfsstat.f_mntfromname, varbufptr, attrlength);
                        
                /* Advance beyond the space just allocated: */
                (char *)varbufptr += attrlength;
                ++((struct attrreference *)attrbufptr);
        }
        if (ATTR_VOL_ENCODINGSUSED & attr) {
                *((unsigned long long *)attrbufptr)++ =
                                (unsigned long long)vcb->encodingsBitmap;
        }
        if (ATTR_VOL_CAPABILITIES & attr) {
                vol_capabilities_attr_t *vcapattrptr;
        
                vcapattrptr = (vol_capabilities_attr_t *)attrbufptr;

                if (vcb->vcbSigWord == kHFSPlusSigWord) {
                        u_int32_t journal_active_cap;
                        u_int32_t case_sensitive;
                        
                        if (hfsmp->jnl)
                                journal_active_cap = VOL_CAP_FMT_JOURNAL_ACTIVE;
                        else
                                journal_active_cap = 0;

                        if (hfsmp->hfs_flags & HFS_CASE_SENSITIVE)
                                case_sensitive = VOL_CAP_FMT_CASE_SENSITIVE;
                        else
                                case_sensitive = 0;
                        
                        vcapattrptr->capabilities[VOL_CAPABILITIES_FORMAT] =
                                        VOL_CAP_FMT_PERSISTENTOBJECTIDS |
                                        VOL_CAP_FMT_SYMBOLICLINKS |
                                        VOL_CAP_FMT_HARDLINKS |
                                        VOL_CAP_FMT_JOURNAL |
                                        journal_active_cap |
                                        case_sensitive |
                                        VOL_CAP_FMT_CASE_PRESERVING |
                                        VOL_CAP_FMT_FAST_STATFS | 
                                        VOL_CAP_FMT_2TB_FILESIZE;
                } else { /* Plain HFS */
                        vcapattrptr->capabilities[VOL_CAPABILITIES_FORMAT] =
                                        VOL_CAP_FMT_PERSISTENTOBJECTIDS |
                                        VOL_CAP_FMT_CASE_PRESERVING |
                                        VOL_CAP_FMT_FAST_STATFS ;
                }
                vcapattrptr->capabilities[VOL_CAPABILITIES_INTERFACES] =
                                        VOL_CAP_INT_SEARCHFS |
                                        VOL_CAP_INT_ATTRLIST |
                                        VOL_CAP_INT_NFSEXPORT |
                                        VOL_CAP_INT_READDIRATTR |
                                        VOL_CAP_INT_EXCHANGEDATA |
                                        VOL_CAP_INT_ALLOCATE |
                                        VOL_CAP_INT_VOL_RENAME |
                                        VOL_CAP_INT_ADVLOCK |
                                        VOL_CAP_INT_FLOCK ;
                vcapattrptr->capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
                vcapattrptr->capabilities[VOL_CAPABILITIES_RESERVED2] = 0;

                vcapattrptr->valid[VOL_CAPABILITIES_FORMAT] =
                                        VOL_CAP_FMT_PERSISTENTOBJECTIDS |
                                        VOL_CAP_FMT_SYMBOLICLINKS |
                                        VOL_CAP_FMT_HARDLINKS |
                                        VOL_CAP_FMT_JOURNAL |
                                        VOL_CAP_FMT_JOURNAL_ACTIVE |
                                        VOL_CAP_FMT_NO_ROOT_TIMES |
                                        VOL_CAP_FMT_SPARSE_FILES |
                                        VOL_CAP_FMT_ZERO_RUNS |
                                        VOL_CAP_FMT_CASE_SENSITIVE |
                                        VOL_CAP_FMT_CASE_PRESERVING |
                                        VOL_CAP_FMT_FAST_STATFS |
                                        VOL_CAP_FMT_2TB_FILESIZE;
                vcapattrptr->valid[VOL_CAPABILITIES_INTERFACES] =
                                        VOL_CAP_INT_SEARCHFS |
                                        VOL_CAP_INT_ATTRLIST |
                                        VOL_CAP_INT_NFSEXPORT |
                                        VOL_CAP_INT_READDIRATTR |
                                        VOL_CAP_INT_EXCHANGEDATA |
                                        VOL_CAP_INT_COPYFILE |
                                        VOL_CAP_INT_ALLOCATE |
                                        VOL_CAP_INT_VOL_RENAME |
                                        VOL_CAP_INT_ADVLOCK |
                                        VOL_CAP_INT_FLOCK ;
                vcapattrptr->valid[VOL_CAPABILITIES_RESERVED1] = 0;
                vcapattrptr->valid[VOL_CAPABILITIES_RESERVED2] = 0;

                ++((vol_capabilities_attr_t *)attrbufptr);
        }
        if (ATTR_VOL_ATTRIBUTES & attr) {
                vol_attributes_attr_t *volattrattrp;
                
                volattrattrp = (vol_attributes_attr_t *)attrbufptr;
                volattrattrp->validattr.commonattr = ATTR_CMN_VALIDMASK;
                volattrattrp->validattr.volattr = ATTR_VOL_VALIDMASK;
                volattrattrp->validattr.dirattr = ATTR_DIR_VALIDMASK;
                volattrattrp->validattr.fileattr = ATTR_FILE_VALIDMASK;
                volattrattrp->validattr.forkattr = ATTR_FORK_VALIDMASK;

                volattrattrp->nativeattr.commonattr = ATTR_CMN_VALIDMASK;
                volattrattrp->nativeattr.volattr = ATTR_VOL_VALIDMASK;
                volattrattrp->nativeattr.dirattr = ATTR_DIR_VALIDMASK;
                volattrattrp->nativeattr.fileattr = ATTR_FILE_VALIDMASK;
                volattrattrp->nativeattr.forkattr = ATTR_FORK_VALIDMASK;
                ++((vol_attributes_attr_t *)attrbufptr);
        }
        
        *abp->ab_attrbufpp = attrbufptr;
        *abp->ab_varbufpp = varbufptr;
}


static void
packcommonattr(
        struct attrblock *abp,
        struct hfsmount *hfsmp,
        struct vnode *vp,
        struct cat_desc * cdp,
        struct cat_attr * cap,
        struct proc *p)
{
        attrgroup_t attr = abp->ab_attrlist->commonattr;
        struct mount *mp = HFSTOVFS(hfsmp);
        void *attrbufptr = *abp->ab_attrbufpp;
        void *varbufptr = *abp->ab_varbufpp;
        uint32_t attrlength = 0;
        boolean_t is_64_bit = proc_is64bit(p);
        
        if (ATTR_CMN_NAME & attr) {
                packnameattr(abp, vp, cdp->cd_nameptr, cdp->cd_namelen);
                attrbufptr = *abp->ab_attrbufpp;
                varbufptr = *abp->ab_varbufpp;
        }
        if (ATTR_CMN_DEVID & attr) {
                *((dev_t *)attrbufptr)++ = hfsmp->hfs_raw_dev;
        }
        if (ATTR_CMN_FSID & attr) {
                fsid_t fsid;
                
                fsid.val[0] = (long)hfsmp->hfs_raw_dev;
                fsid.val[1] = (long)vfs_typenum(mp);
                *((fsid_t *)attrbufptr) = fsid;
                ++((fsid_t *)attrbufptr);
        }
        if (ATTR_CMN_OBJTYPE & attr) {
                *((fsobj_type_t *)attrbufptr)++ = IFTOVT(cap->ca_mode);
        }
        if (ATTR_CMN_OBJTAG & attr) {
                *((fsobj_tag_t *)attrbufptr)++ = VT_HFS;
        }
        /*
         * Exporting file IDs from HFS Plus:
         *
         * For "normal" files the c_fileid is the same value as the
         * c_cnid.  But for hard link files, they are different - the
         * c_cnid belongs to the active directory entry (ie the link)
         * and the c_fileid is for the actual inode (ie the data file).
         *
         * The stat call (getattr) will always return the c_fileid
         * and Carbon APIs, which are hardlink-ignorant, will always
         * receive the c_cnid (from getattrlist).
         */
    if (ATTR_CMN_OBJID & attr) {
                ((fsobj_id_t *)attrbufptr)->fid_objno = cdp->cd_cnid;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_OBJPERMANENTID & attr) {
                ((fsobj_id_t *)attrbufptr)->fid_objno = cdp->cd_cnid;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_PAROBJID & attr) {
                ((fsobj_id_t *)attrbufptr)->fid_objno = cdp->cd_parentcnid;
                ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                ++((fsobj_id_t *)attrbufptr);
        }
        if (ATTR_CMN_SCRIPT & attr) {
                *((text_encoding_t *)attrbufptr)++ = cdp->cd_encoding;
        }
        if (ATTR_CMN_CRTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = cap->ca_itime;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = cap->ca_itime;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_MODTIME & attr) {
            if (is_64_bit) {
             ((struct user_timespec *)attrbufptr)->tv_sec = cap->ca_mtime;
             ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
             ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = cap->ca_mtime;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_CHGTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = cap->ca_ctime;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = cap->ca_ctime;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_ACCTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = cap->ca_atime;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = cap->ca_atime;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_BKUPTIME & attr) {
            if (is_64_bit) {
            ((struct user_timespec *)attrbufptr)->tv_sec = cap->ca_btime;
            ((struct user_timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            ((struct timespec *)attrbufptr)->tv_sec = cap->ca_btime;
            ((struct timespec *)attrbufptr)->tv_nsec = 0;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_FNDRINFO & attr) {
                bcopy(&cap->ca_finderinfo, attrbufptr, sizeof(u_int8_t) * 32);
                (char *)attrbufptr += sizeof(u_int8_t) * 32;
        }
        if (ATTR_CMN_OWNERID & attr) {
                *((uid_t *)attrbufptr)++ =
                        (cap->ca_uid == UNKNOWNUID) ? kauth_cred_getuid(proc_ucred(p)) : cap->ca_uid;
        }
        if (ATTR_CMN_GRPID & attr) {
                *((gid_t *)attrbufptr)++ = cap->ca_gid;
        }
        if (ATTR_CMN_ACCESSMASK & attr) {
                /*
                 * [2856576]  Since we are dynamically changing the owner, also
                 * effectively turn off the set-user-id and set-group-id bits,
                 * just like chmod(2) would when changing ownership.  This prevents
                 * a security hole where set-user-id programs run as whoever is
                 * logged on (or root if nobody is logged in yet!)
                 */
                *((uint32_t *)attrbufptr)++ =
                        (cap->ca_uid == UNKNOWNUID) ? cap->ca_mode & ~(S_ISUID | S_ISGID) : cap->ca_mode;
        }
        if (ATTR_CMN_NAMEDATTRCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = 0;
        }
        if (ATTR_CMN_NAMEDATTRLIST & attr) {
                attrlength = 0;
                ((struct attrreference *)attrbufptr)->attr_dataoffset = 0;
                ((struct attrreference *)attrbufptr)->attr_length = attrlength;
                /*
                 * Advance beyond the space just allocated and
                 * round up to the next 4-byte boundary:
                 */
                (char *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
                ++((struct attrreference *)attrbufptr);
        }
        if (ATTR_CMN_FLAGS & attr) {
                *((uint32_t *)attrbufptr)++ = cap->ca_flags;
        }
        if (ATTR_CMN_USERACCESS & attr) {
                *((uint32_t *)attrbufptr)++ =
                        DerivePermissionSummary(cap->ca_uid, cap->ca_gid,
                                cap->ca_mode, mp, proc_ucred(current_proc()),
                                current_proc());
        }
        
        *abp->ab_attrbufpp = attrbufptr;
        *abp->ab_varbufpp = varbufptr;
}

static void
packdirattr(
        struct attrblock *abp,
        struct hfsmount *hfsmp,
        struct vnode *vp,
        struct cat_desc * descp,
        struct cat_attr * cattrp)
{
        attrgroup_t attr = abp->ab_attrlist->dirattr;
        void *attrbufptr = *abp->ab_attrbufpp;
        
        if (ATTR_DIR_LINKCOUNT & attr)
                *((uint32_t *)attrbufptr)++ = cattrp->ca_nlink;
        if (ATTR_DIR_ENTRYCOUNT & attr) {
                uint32_t entries = cattrp->ca_entries;

                if (descp->cd_parentcnid == kHFSRootParentID) {
                        if (hfsmp->hfs_privdir_desc.cd_cnid != 0)
                                --entries;          /* hide private dir */
                        if (hfsmp->jnl || ((HFSTOVCB(hfsmp)->vcbAtrb & kHFSVolumeJournaledMask) && (hfsmp->hfs_flags & HFS_READ_ONLY)))
                                entries -= 2;   /* hide the journal files */
                }

                *((uint32_t *)attrbufptr)++ = entries;
        }
        if (ATTR_DIR_MOUNTSTATUS & attr) {
                if (vp != NULL && vnode_mountedhere(vp) != NULL)
                        *((uint32_t *)attrbufptr)++ = DIR_MNTSTATUS_MNTPOINT;
                else
                        *((uint32_t *)attrbufptr)++ = 0;
        }
        *abp->ab_attrbufpp = attrbufptr;
}

static void
packfileattr(
        struct attrblock *abp,
        struct hfsmount *hfsmp,
        struct cat_attr *cattrp,
        struct cat_fork *datafork,
        struct cat_fork *rsrcfork)
{
        attrgroup_t attr = abp->ab_attrlist->fileattr;
        void *attrbufptr = *abp->ab_attrbufpp;
        void *varbufptr = *abp->ab_varbufpp;
        uint32_t attrlength;
        uint32_t allocblksize;

        allocblksize = HFSTOVCB(hfsmp)->blockSize;

        if (ATTR_FILE_LINKCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = cattrp->ca_nlink;
        }
        if (ATTR_FILE_TOTALSIZE & attr) {
                *((off_t *)attrbufptr)++ = datafork->cf_size + rsrcfork->cf_size;
        }
        if (ATTR_FILE_ALLOCSIZE & attr) {
                *((off_t *)attrbufptr)++ =
                        (off_t)cattrp->ca_blocks * (off_t)allocblksize;
        }
        if (ATTR_FILE_IOBLOCKSIZE & attr) {
                *((uint32_t *)attrbufptr)++ = hfsmp->hfs_logBlockSize;
        }
        if (ATTR_FILE_CLUMPSIZE & attr) {
                *((uint32_t *)attrbufptr)++ = HFSTOVCB(hfsmp)->vcbClpSiz;
        }
        if (ATTR_FILE_DEVTYPE & attr) {
                if (S_ISBLK(cattrp->ca_mode) || S_ISCHR(cattrp->ca_mode))
                        *((uint32_t *)attrbufptr)++ = (uint32_t)cattrp->ca_rdev;
                else
                        *((uint32_t *)attrbufptr)++ = 0;
        }
        if (ATTR_FILE_FILETYPE & attr) {
                *((uint32_t *)attrbufptr)++ = 0;
        }
        if (ATTR_FILE_FORKCOUNT & attr) {
                *((uint32_t *)attrbufptr)++ = 2;
        }
        if (ATTR_FILE_FORKLIST & attr) {
                attrlength = 0;
                ((struct attrreference *)attrbufptr)->attr_dataoffset = 0;
                ((struct attrreference *)attrbufptr)->attr_length = attrlength; 
                /*
                 * Advance beyond the space just allocated and
                 * round up to the next 4-byte boundary:
                 */
                (char *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
                ++((struct attrreference *)attrbufptr);
        }
        if (ATTR_FILE_DATALENGTH & attr) {
                *((off_t *)attrbufptr)++ = datafork->cf_size;
        }
        if (ATTR_FILE_DATAALLOCSIZE & attr) {
                *((off_t *)attrbufptr)++ =
                        (off_t)datafork->cf_blocks * (off_t)allocblksize;
        }
        if (ATTR_FILE_DATAEXTENTS & attr) {
                bcopy(&datafork->cf_extents, attrbufptr, sizeof(extentrecord));
                (char *)attrbufptr += sizeof(extentrecord);
        }
        if (ATTR_FILE_RSRCLENGTH & attr) {
                *((off_t *)attrbufptr)++ = rsrcfork->cf_size;
        }
        if (ATTR_FILE_RSRCALLOCSIZE & attr) {
                *((off_t *)attrbufptr)++ =
                        (off_t)rsrcfork->cf_blocks * (off_t)allocblksize;
        }
        if (ATTR_FILE_RSRCEXTENTS & attr) {
                bcopy(&rsrcfork->cf_extents, attrbufptr, sizeof(extentrecord));
                (char *)attrbufptr += sizeof(extentrecord);
        }
        *abp->ab_attrbufpp = attrbufptr;
        *abp->ab_varbufpp = varbufptr;
}

#if 0
static int
unpackattrblk(struct attrblock *abp, struct vnode *vp)
{
        struct attrlist *attrlistp = abp->ab_attrlist;
        int error;

        if (attrlistp->volattr) {
                error = unpackvolattr(abp, VTOHFS(vp), vp);
                if (error)
                        return (error);
        } else if (attrlistp->commonattr) {
                unpackcommonattr(abp, vp);
        }
        return (0);
}


static void
unpackcommonattr(
        struct attrblock *abp,
        struct vnode *vp)
{
        attrgroup_t attr = abp->ab_attrlist->commonattr;
        void *attrbufptr = *abp->ab_attrbufpp;
        struct cnode *cp = VTOC(vp);
        boolean_t is_64_bit = proc_is64bit(current_proc());

        if (ATTR_CMN_SCRIPT & attr) {
                cp->c_encoding = (u_int32_t)*((text_encoding_t *)attrbufptr)++;
                hfs_setencodingbits(VTOHFS(vp), cp->c_encoding);
        }
        if (ATTR_CMN_CRTIME & attr) {
            if (is_64_bit) {
            cp->c_itime = ((struct user_timespec *)attrbufptr)->tv_sec;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            cp->c_itime = ((struct timespec *)attrbufptr)->tv_sec;
            ++((struct timespec *)attrbufptr);
            }
        }
        if (ATTR_CMN_MODTIME & attr) {
                cp->c_mtime = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
                cp->c_touch_modtime = FALSE;
        }
        if (ATTR_CMN_CHGTIME & attr) {
                cp->c_ctime = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
                cp->c_touch_chgtime = FALSE;
        }
        if (ATTR_CMN_ACCTIME & attr) {
                cp->c_atime = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
                cp->c_touch_acctime = FALSE;
        }
        if (ATTR_CMN_BKUPTIME & attr) {
                cp->c_btime = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
        }
        if (ATTR_CMN_FNDRINFO & attr) {
                bcopy(attrbufptr, &cp->c_attr.ca_finderinfo,
                        sizeof(cp->c_attr.ca_finderinfo));
                (char *)attrbufptr += sizeof(cp->c_attr.ca_finderinfo);
        }
        if (ATTR_CMN_OWNERID & attr) {
                if (VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) {
                        u_int32_t uid = (u_int32_t)*((uid_t *)attrbufptr)++;
                        if (uid != (uid_t)VNOVAL)
                                cp->c_uid = uid;
                } else {
                        ((uid_t *)attrbufptr)++;
                }
        }
        if (ATTR_CMN_GRPID & attr) {
                u_int32_t gid = (u_int32_t)*((gid_t *)attrbufptr)++;
                if (VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) {
                    if (gid != (gid_t)VNOVAL)
                        cp->c_gid = gid;
                }
        }
        if (ATTR_CMN_ACCESSMASK & attr) {
                u_int16_t mode = (u_int16_t)*((uint32_t *)attrbufptr)++;
                if (VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) {
                        if (mode != (mode_t)VNOVAL) {
                                cp->c_mode &= ~ALLPERMS;
                                cp->c_mode |= (mode & ALLPERMS);
                        }
                }
        }
        if (ATTR_CMN_FLAGS & attr) {
                uint32_t flags = *((uint32_t *)attrbufptr)++;
                /*
                 * Flags are settable only on HFS+ volumes.  A special
                 * exception is made for the IMMUTABLE flags
                 * (SF_IMMUTABLE and UF_IMMUTABLE), which can be set on
                 * HFS volumes as well:
                 */
                if ((VTOVCB(vp)->vcbSigWord == kHFSPlusSigWord) ||
                    ((VTOVCB(vp)->vcbSigWord == kHFSSigWord) &&
                     ((flags & ~IMMUTABLE) == 0))) {
                        if (flags != (uint32_t)VNOVAL) {
                                cp->c_flags = flags;
                        }
                }
        }
        *abp->ab_attrbufpp = attrbufptr;
}


static int
unpackvolattr(
        struct attrblock *abp,
        struct hfsmount *hfsmp,
        struct vnode *root_vp)
{
        void *attrbufptr = *abp->ab_attrbufpp;
        attrgroup_t attr;
        int error = 0;
        boolean_t is_64_bit = proc_is64bit(current_proc());

        HFS_MOUNT_LOCK(hfsmp, TRUE);

        attr = abp->ab_attrlist->commonattr;
        if (attr == 0)
                goto volattr;

        if (ATTR_CMN_SCRIPT & attr) {
                hfsmp->volumeNameEncodingHint =
                                (u_int32_t)*(((text_encoding_t *)attrbufptr)++);
        }
        if (ATTR_CMN_CRTIME & attr) {
            if (is_64_bit) {
            hfsmp->vcbCrDate = ((struct user_timespec *)attrbufptr)->tv_sec;
            ++((struct user_timespec *)attrbufptr);
            }
            else {
            hfsmp->vcbCrDate = ((struct timespec *)attrbufptr)->tv_sec;
            ++((struct timespec *)attrbufptr);
            }
                
                /* The volume's create date comes from the root directory */
                VTOC(root_vp)->c_itime = hfsmp->vcbCrDate;
                VTOC(root_vp)->c_flag |= C_MODIFIED;
                /*
                 * XXX Should we also do a relative change to the
                 * the volume header's create date in local time?
                 */
        }
        if (ATTR_CMN_MODTIME & attr) {
                hfsmp->vcbLsMod = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
        }
        if (ATTR_CMN_BKUPTIME & attr) {
                hfsmp->vcbVolBkUp = ((struct timespec *)attrbufptr)->tv_sec;
                ++((struct timespec *)attrbufptr);
        }
        if (ATTR_CMN_FNDRINFO & attr) {
                bcopy(attrbufptr, &hfsmp->vcbFndrInfo, sizeof(hfsmp->vcbFndrInfo));
                (char *)attrbufptr += sizeof(hfsmp->vcbFndrInfo);
        }

volattr:        
        attr = abp->ab_attrlist->volattr & ~ATTR_VOL_INFO;
        /*
         * XXX - no validation is done on the name!
         * It could be empty or garbage (bad UTF-8).
         */
        if (ATTR_VOL_NAME & attr) {
                attrreference_t * attr_refp = (attrreference_t *) attrbufptr;
                
                error = copystr(((char *)attrbufptr) + attr_refp->attr_dataoffset,
                                hfsmp->vcbVN, MIN(attr_refp->attr_length, sizeof(hfsmp->vcbVN)),
                                NULL);
                if (error == 0)
                        (char *)attrbufptr += sizeof(struct attrreference);
        }
        *abp->ab_attrbufpp = attrbufptr;

        hfsmp->vcbFlags |= 0xFF00;
        HFS_MOUNT_UNLOCK(hfsmp, TRUE);

        return (error);
}
#endif

/*
 * Calculate the total size of an attribute block.
 */
 __private_extern__
int
hfs_attrblksize(struct attrlist *attrlist)
{
        int size;
        attrgroup_t a;
        int sizeof_timespec;
        boolean_t is_64_bit = proc_is64bit(current_proc());
        
    if (is_64_bit) 
        sizeof_timespec = sizeof(struct user_timespec);
    else
        sizeof_timespec = sizeof(struct timespec);

#if ((ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID | ATTR_CMN_OBJTYPE |  \
      ATTR_CMN_OBJTAG | ATTR_CMN_OBJID | ATTR_CMN_OBJPERMANENTID |         \
      ATTR_CMN_PAROBJID | ATTR_CMN_SCRIPT | ATTR_CMN_CRTIME |              \
      ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |             \
      ATTR_CMN_BKUPTIME | ATTR_CMN_FNDRINFO | ATTR_CMN_OWNERID |           \
      ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK | ATTR_CMN_NAMEDATTRCOUNT |     \
      ATTR_CMN_NAMEDATTRLIST | ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS)       \
      != ATTR_CMN_VALIDMASK)
#error  hfs_attrblksize: Missing bits in common mask computation!
#endif
        DBG_ASSERT((attrlist->commonattr & ~ATTR_CMN_VALIDMASK) == 0);

#if ((ATTR_VOL_FSTYPE | ATTR_VOL_SIGNATURE | ATTR_VOL_SIZE |                \
      ATTR_VOL_SPACEFREE | ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |   \
      ATTR_VOL_ALLOCATIONCLUMP | ATTR_VOL_IOBLOCKSIZE |                     \
      ATTR_VOL_OBJCOUNT | ATTR_VOL_FILECOUNT | ATTR_VOL_DIRCOUNT |          \
      ATTR_VOL_MAXOBJCOUNT | ATTR_VOL_MOUNTPOINT | ATTR_VOL_NAME |          \
      ATTR_VOL_MOUNTFLAGS | ATTR_VOL_INFO | ATTR_VOL_MOUNTEDDEVICE |        \
      ATTR_VOL_ENCODINGSUSED | ATTR_VOL_CAPABILITIES | ATTR_VOL_ATTRIBUTES) \
      != ATTR_VOL_VALIDMASK)
#error  hfs_attrblksize: Missing bits in volume mask computation!
#endif
        DBG_ASSERT((attrlist->volattr & ~ATTR_VOL_VALIDMASK) == 0);

#if ((ATTR_DIR_LINKCOUNT | ATTR_DIR_ENTRYCOUNT | ATTR_DIR_MOUNTSTATUS)  \
      != ATTR_DIR_VALIDMASK)
#error  hfs_attrblksize: Missing bits in directory mask computation!
#endif
        DBG_ASSERT((attrlist->dirattr & ~ATTR_DIR_VALIDMASK) == 0);

#if ((ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE | ATTR_FILE_ALLOCSIZE |        \
      ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_CLUMPSIZE | ATTR_FILE_DEVTYPE |        \
      ATTR_FILE_FILETYPE | ATTR_FILE_FORKCOUNT | ATTR_FILE_FORKLIST |          \
      ATTR_FILE_DATALENGTH | ATTR_FILE_DATAALLOCSIZE | ATTR_FILE_DATAEXTENTS | \
      ATTR_FILE_RSRCLENGTH | ATTR_FILE_RSRCALLOCSIZE | ATTR_FILE_RSRCEXTENTS)  \
      != ATTR_FILE_VALIDMASK)
#error  hfs_attrblksize: Missing bits in file mask computation!
#endif
        DBG_ASSERT((attrlist->fileattr & ~ATTR_FILE_VALIDMASK) == 0);

#if ((ATTR_FORK_TOTALSIZE | ATTR_FORK_ALLOCSIZE) != ATTR_FORK_VALIDMASK)
#error  hfs_attrblksize: Missing bits in fork mask computation!
#endif
        DBG_ASSERT((attrlist->forkattr & ~ATTR_FORK_VALIDMASK) == 0);

        size = 0;
        
        if ((a = attrlist->commonattr) != 0) {
        if (a & ATTR_CMN_NAME) size += sizeof(struct attrreference);
                if (a & ATTR_CMN_DEVID) size += sizeof(dev_t);
                if (a & ATTR_CMN_FSID) size += sizeof(fsid_t);
                if (a & ATTR_CMN_OBJTYPE) size += sizeof(fsobj_type_t);
                if (a & ATTR_CMN_OBJTAG) size += sizeof(fsobj_tag_t);
                if (a & ATTR_CMN_OBJID) size += sizeof(fsobj_id_t);
                if (a & ATTR_CMN_OBJPERMANENTID) size += sizeof(fsobj_id_t);
                if (a & ATTR_CMN_PAROBJID) size += sizeof(fsobj_id_t);
                if (a & ATTR_CMN_SCRIPT) size += sizeof(text_encoding_t);
        if (a & ATTR_CMN_CRTIME) size += sizeof_timespec;
        if (a & ATTR_CMN_MODTIME) size += sizeof_timespec;
        if (a & ATTR_CMN_CHGTIME) size += sizeof_timespec;
        if (a & ATTR_CMN_ACCTIME) size += sizeof_timespec;
        if (a & ATTR_CMN_BKUPTIME) size += sizeof_timespec;
                if (a & ATTR_CMN_FNDRINFO) size += 32 * sizeof(u_int8_t);
                if (a & ATTR_CMN_OWNERID) size += sizeof(uid_t);
                if (a & ATTR_CMN_GRPID) size += sizeof(gid_t);
                if (a & ATTR_CMN_ACCESSMASK) size += sizeof(uint32_t);
                if (a & ATTR_CMN_NAMEDATTRCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_CMN_NAMEDATTRLIST) size += sizeof(struct attrreference);
                if (a & ATTR_CMN_FLAGS) size += sizeof(uint32_t);
                if (a & ATTR_CMN_USERACCESS) size += sizeof(uint32_t);
        };
        if ((a = attrlist->volattr) != 0) {
                if (a & ATTR_VOL_FSTYPE) size += sizeof(uint32_t);
                if (a & ATTR_VOL_SIGNATURE) size += sizeof(uint32_t);
                if (a & ATTR_VOL_SIZE) size += sizeof(off_t);
                if (a & ATTR_VOL_SPACEFREE) size += sizeof(off_t);
                if (a & ATTR_VOL_SPACEAVAIL) size += sizeof(off_t);
                if (a & ATTR_VOL_MINALLOCATION) size += sizeof(off_t);
                if (a & ATTR_VOL_ALLOCATIONCLUMP) size += sizeof(off_t);
                if (a & ATTR_VOL_IOBLOCKSIZE) size += sizeof(uint32_t);
                if (a & ATTR_VOL_OBJCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_VOL_FILECOUNT) size += sizeof(uint32_t);
                if (a & ATTR_VOL_DIRCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_VOL_MAXOBJCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_VOL_MOUNTPOINT) size += sizeof(struct attrreference);
                if (a & ATTR_VOL_NAME) size += sizeof(struct attrreference);
                if (a & ATTR_VOL_MOUNTFLAGS) size += sizeof(uint32_t);
                if (a & ATTR_VOL_MOUNTEDDEVICE) size += sizeof(struct attrreference);
                if (a & ATTR_VOL_ENCODINGSUSED) size += sizeof(unsigned long long);
                if (a & ATTR_VOL_CAPABILITIES) size += sizeof(vol_capabilities_attr_t);
                if (a & ATTR_VOL_ATTRIBUTES) size += sizeof(vol_attributes_attr_t);
        };
        if ((a = attrlist->dirattr) != 0) {
                if (a & ATTR_DIR_LINKCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_DIR_ENTRYCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_DIR_MOUNTSTATUS) size += sizeof(uint32_t);
        };
        if ((a = attrlist->fileattr) != 0) {
                if (a & ATTR_FILE_LINKCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_FILE_TOTALSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_ALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_IOBLOCKSIZE) size += sizeof(uint32_t);
                if (a & ATTR_FILE_CLUMPSIZE) size += sizeof(uint32_t);
                if (a & ATTR_FILE_DEVTYPE) size += sizeof(uint32_t);
                if (a & ATTR_FILE_FILETYPE) size += sizeof(uint32_t);
                if (a & ATTR_FILE_FORKCOUNT) size += sizeof(uint32_t);
                if (a & ATTR_FILE_FORKLIST) size += sizeof(struct attrreference);
                if (a & ATTR_FILE_DATALENGTH) size += sizeof(off_t);
                if (a & ATTR_FILE_DATAALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_DATAEXTENTS) size += sizeof(extentrecord);
                if (a & ATTR_FILE_RSRCLENGTH) size += sizeof(off_t);
                if (a & ATTR_FILE_RSRCALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_RSRCEXTENTS) size += sizeof(extentrecord);
        };
        if ((a = attrlist->forkattr) != 0) {
                if (a & ATTR_FORK_TOTALSIZE) size += sizeof(off_t);
                if (a & ATTR_FORK_ALLOCSIZE) size += sizeof(off_t);
        };

        return size;
}


__private_extern__
unsigned long
DerivePermissionSummary(uid_t obj_uid, gid_t obj_gid, mode_t obj_mode,
                struct mount *mp, kauth_cred_t cred, struct proc *p)
{
        unsigned long permissions;

        if (obj_uid == UNKNOWNUID)
                obj_uid = kauth_cred_getuid(proc_ucred(p));

        /* User id 0 (root) always gets access. */
        if (!suser(cred, NULL)) {
                permissions = R_OK | W_OK | X_OK;
                goto Exit;
        };

        /* Otherwise, check the owner. */
        if (hfs_owner_rights(VFSTOHFS(mp), obj_uid, cred, p, false) == 0) {
                permissions = ((unsigned long)obj_mode & S_IRWXU) >> 6;
                goto Exit;
        }

        /* Otherwise, check the groups. */
        if (! (((unsigned int)vfs_flags(mp)) & MNT_UNKNOWNPERMISSIONS)) {
                int is_member;

                if (kauth_cred_ismember_gid(cred, obj_gid, &is_member) == 0 && is_member) {
                        permissions = ((unsigned long)obj_mode & S_IRWXG) >> 3;
                        goto Exit;
                }
        }

        /* Otherwise, settle for 'others' access. */
        permissions = (unsigned long)obj_mode & S_IRWXO;

Exit:
        return (permissions);    
}