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These changes fall into three categores which are:

1) Eliminate compiler warning (COMP)
2) Bug fixes (BUG)
3) Reduce CPU cycles. (CPU)
Update prototype for blkmap_get to accept a single blkmap.

/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/*
 * Block mapping code taken from xfs_db.
 */

/*
 * Block map entry.
 */
typedef struct blkent {
	xfs_dfiloff_t	startoff;
	xfs_dfilblks_t	nblks;
	xfs_dfsbno_t	blks[1];
} blkent_t;
#define	BLKENT_SIZE(n)	\
	(offsetof(blkent_t, blks) + (sizeof(xfs_dfsbno_t) * (n)))

/*
 * Block map.
 */
typedef	struct blkmap {
	int		naents;
	int		nents;
	blkent_t	*ents[1];
} blkmap_t;
#define	BLKMAP_SIZE(n)	\
	(offsetof(blkmap_t, ents) + (sizeof(blkent_t *) * (n)))

/*
 * Extent descriptor.
 */
typedef struct bmap_ext {
	xfs_dfiloff_t	startoff;
	xfs_dfsbno_t	startblock;
	xfs_dfilblks_t	blockcount;
	int		flag;
} bmap_ext_t;

void		blkent_append(blkent_t **entp, xfs_dfsbno_t b,
			      xfs_dfilblks_t c);
blkent_t	*blkent_new(xfs_dfiloff_t o, xfs_dfsbno_t b, xfs_dfilblks_t c);
void		blkent_prepend(blkent_t **entp, xfs_dfsbno_t b,
			       xfs_dfilblks_t c);
blkmap_t	*blkmap_alloc(xfs_extnum_t);
void		blkmap_free(blkmap_t *blkmap);
xfs_dfsbno_t	blkmap_get(blkmap_t *blkmap, xfs_dfiloff_t o);
int		blkmap_getn(blkmap_t *blkmap, xfs_dfiloff_t o,
			    xfs_dfilblks_t nb, bmap_ext_t **bmpp, 
			    bmap_ext_t *bmpp_single);
void		blkmap_grow(blkmap_t **blkmapp, blkent_t **entp,
			    blkent_t *newent);
xfs_dfiloff_t	blkmap_last_off(blkmap_t *blkmap);
xfs_dfiloff_t	blkmap_next_off(blkmap_t *blkmap, xfs_dfiloff_t o, int *t);
void		blkmap_set_blk(blkmap_t **blkmapp, xfs_dfiloff_t o,
			       xfs_dfsbno_t b);
void		blkmap_set_ext(blkmap_t **blkmapp, xfs_dfiloff_t o,
			       xfs_dfsbno_t b, xfs_dfilblks_t c);
void		blkmap_shrink(blkmap_t *blkmap, blkent_t **entp);