btrfs: constify arguments of compare_inode_defrag()

A comparator function does not change its parameters, make them const.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/defrag.c b/fs/btrfs/defrag.c
index e2949f6..e4bb5a8 100644 (file)
--- a/fs/btrfs/defrag.c
+++ b/fs/btrfs/defrag.c
@@ -45,8 +45,8 @@ struct inode_defrag {
        u32 extent_thresh;
 };
 
-static int compare_inode_defrag(struct inode_defrag *defrag1,
-                                 struct inode_defrag *defrag2)
+static int compare_inode_defrag(const struct inode_defrag *defrag1,
+                               const struct inode_defrag *defrag2)
 {
        if (defrag1->root > defrag2->root)
                return 1;