From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 25 May 2018 14:24:24 +0200
Subject: [Cluster-devel] gfs2 iomap: BUG_ON(buffer_unmapped) in
	submit_bh_wbc
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On Thu, May 24, 2018 at 08:25:55PM +0200, Andreas Gruenbacher wrote:
> Didn't get very far with your bh removal patches so far.

I think we could probably lift the whole XFS writeback code to iomap.c
once it stabilizes a little.  It just needs to use struct iomap
instead of the xfs-specific xfs_bmbt_irec, and the file system would
have to provide the map_blocks and end_io hooks.