xfs: replace xfs_bmbt_lookup_ge with xfs_bmbt_lookup_first

We only use xfs_bmbt_lookup_ge to look up the first bmap record in an
inode, so replace xfs_bmbt_lookup_ge with a special purpose helper that
is a bit more descriptive.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_bmap.c

@@ -120,16 +120,13 @@ xfs_bmbt_lookup_eq(
 }
 
 STATIC int				/* error */
-xfs_bmbt_lookup_ge(
+xfs_bmbt_lookup_first(
 	struct xfs_btree_cur	*cur,
-	xfs_fileoff_t		off,
-	xfs_fsblock_t		bno,
-	xfs_filblks_t		len,
 	int			*stat)	/* success/failure */
 {
-	cur->bc_rec.b.br_startoff = off;
-	cur->bc_rec.b.br_startblock = bno;
-	cur->bc_rec.b.br_blockcount = len;
+	cur->bc_rec.b.br_startoff = 0;
+	cur->bc_rec.b.br_startblock = 0;
+	cur->bc_rec.b.br_blockcount = 0;
 	return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
 }
 
@@ -965,7 +962,8 @@ xfs_bmap_add_attrfork_btree(
 		cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
 		cur->bc_private.b.dfops = dfops;
 		cur->bc_private.b.firstblock = *firstblock;
-		if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
+		error = xfs_bmbt_lookup_first(cur, &stat);
+		if (error)
 			goto error0;
 		/* must be at least one entry */
 		XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0);