xfs: Use uint64_t to count maximum blocks that can be used by BMBT

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>

Author: Chandan Babu R

fs/xfs/libxfs/xfs_bmap.c

@@ -52,9 +52,9 @@ xfs_bmap_compute_maxlevels(
 	xfs_mount_t	*mp,		/* file system mount structure */
 	int		whichfork)	/* data or attr fork */
 {
-	int		level;		/* btree level */
-	uint		maxblocks;	/* max blocks at this level */
+	uint64_t	maxblocks;	/* max blocks at this level */
 	xfs_extnum_t	maxleafents;	/* max leaf entries possible */
+	int		level;		/* btree level */
 	int		maxrootrecs;	/* max records in root block */
 	int		minleafrecs;	/* min records in leaf block */
 	int		minnoderecs;	/* min records in node block */
@@ -88,7 +88,7 @@ xfs_bmap_compute_maxlevels(
 		if (maxblocks <= maxrootrecs)
 			maxblocks = 1;
 		else
-			maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
+			maxblocks = howmany_64(maxblocks, minnoderecs);
 	}
 	mp->m_bm_maxlevels[whichfork] = level;
 	ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk());