xfs: kill XFS_DIR2...FIRSTDB macros

They are just simple wrappers around xfs_dir2_byte_to_db(), and
we've already removed one usage earlier in the patch set. Kill
the rest before we start removing the xfs_mount from conversion
functions.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>



diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c
index f571723..dc4ef19 100644
--- a/fs/xfs/xfs_dir2_leaf.c
+++ b/fs/xfs/xfs_dir2_leaf.c
@@ -347,8 +347,8 @@
 	int			error;
 
 	ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
-	ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
-	       bno < XFS_DIR2_FREE_FIRSTDB(mp));
+	ASSERT(bno >= xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET) &&
+	       bno < xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET));
 
 	error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp,
 			       XFS_DATA_FORK);
@@ -404,7 +404,7 @@
 		return error;
 	}
 	ldb = xfs_dir2_da_to_db(mp, blkno);
-	ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp));
+	ASSERT(ldb == xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET));
 	/*
 	 * Initialize the leaf block, get a buffer for it.
 	 */
@@ -1798,7 +1798,8 @@
 	/*
 	 * Get rid of the freespace block.
 	 */
-	error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp);
+	error = xfs_dir2_shrink_inode(args,
+			xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET), fbp);
 	if (error) {
 		/*
 		 * This can't fail here because it can only happen when