From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Date: Tue, 21 Oct 2014 23:04:34 -0700
Subject: [Cluster-devel] [PATCH][try6] VFS: new want_holesize and
 got_holesize buffer_head flags for fiemap
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This looks like a big indicator that get_blocks is the wrong
interface for fiemap.