commit 027e6efd2b432232562d726f14702f79792b38cb
Author: Eric Sandeen <sandeen@sandeen.net>
Date:   Mon May 30 10:35:56 2016 +1000

    xfs_db: defang frag command
    
    Too many people freak out about this fictitious "fragmentation
    factor."  As shown in the fact, it is largely meaningless, because
    the number approaches 100% extremely quickly for just a few
    extents per file.
    
    I thought about removing it altogether, but perhaps a note
    about its uselessness, and a more soothing metric (avg extents
    per file) might be useful.
    
    Signed-off-by: Eric Sandeen <sandeen@redhat.com>
    Reviewed-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Dave Chinner <david@fromorbit.com>

Index: xfsprogs-4.5.0/db/frag.c
===================================================================
--- xfsprogs-4.5.0.orig/db/frag.c
+++ xfsprogs-4.5.0/db/frag.c
@@ -172,6 +172,10 @@ frag_f(
 		answer = 0.0;
 	dbprintf(_("actual %llu, ideal %llu, fragmentation factor %.2f%%\n"),
 		extcount_actual, extcount_ideal, answer);
+	dbprintf(_("Note, this number is largely meaningless.\n"));
+	answer = (double)extcount_actual / (double)extcount_ideal;
+	dbprintf(_("Files on this filesystem average %.2f extents per file\n"),
+		answer);
 	return 0;
 }