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xfs: use the iomap writeback code v2

From:  Christoph Hellwig <hch-AT-lst.de>
To:  darrick.wong-AT-oracle.com, linux-xfs-AT-vger.kernel.org
Subject:  xfs: use the iomap writeback code v2
Date:  Tue, 3 Sep 2019 14:57:38 +0200
Message-ID:  <20190903125743.2970-1-hch@lst.de>
Cc:  linux-fsdevel-AT-vger.kernel.org
Archive-link:  Article

This series cleans up the xfs writepage code and then lifts it to
fs/iomap/ so that it could be use by other file systems.  I've been
wanting to [do] this for a while so that I could eventually convert gfs2
over to it, but I never got to it.  Now Damien has a new zonefs file
system for semi-raw access to zoned block devices that would like to use
the iomap code instead of reinventing it, so I finally had to do the
work.

Changes since v1:
 - rebased to latest iomap-for-next
 - fix up a comment to use iomap instead of imap
 - update a commit log


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