linux-kernel - lift the xfs writepage code into iomap v6

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Message-Id: <20191006154608.24738-1-hch@lst.de>
Date:   Sun,  6 Oct 2019 17:45:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Darrick J . Wong" <darrick.wong@...cle.com>
Cc:     Damien Le Moal <Damien.LeMoal@....com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: lift the xfs writepage code into iomap v6

Hi all,

this series cleans up the xfs writepage code and then lifts it to
fs/iomap.c so that it could be use by other file system.  I've been
wanting to 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 v5:
 - move the tracing code to fs/iomap/trace.[ch]
 - fix a bisection issue with the tracing code
 - add an assert that xfs_end_io now only gets "complicated" completions
 - better document the iomap_writeback_ops methods in iomap.h

Changes since v4:
 - rebased on top 5.4-rc1
 - drop the addition of list_pop / list_pop_entry
 - re-split a few patches to better fit Darricks scheme of keeping the
   iomap additions separate from the XFS switchover

Changes since v3:
 - re-split the pages to add new code to iomap and then switch xfs to
   it later (Darrick)

Changes since v2:
 - rebased to v5.3-rc1
 - folded in a few changes from the gfs2 enablement series

Changes since v1:
 - rebased to the latest xfs for-next tree
 - keep the preallocated transactions for size updates
 - rename list_pop to list_pop_entry and related cleanups
 - better document the nofs context handling
 - document that the iomap tracepoints are not a stable API