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);    
}