linux-kernel - Convert write_cache_pages() to an iterator v3

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Message-Id: <20231218153553.807799-1-hch@lst.de>
Date: Mon, 18 Dec 2023 16:35:36 +0100
From: Christoph Hellwig <hch@....de>
To: linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Jan Kara <jack@...e.com>,
	David Howells <dhowells@...hat.com>,
	Brian Foster <bfoster@...hat.com>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Convert write_cache_pages() to an iterator v3

Hi all,

this is basically a evolution of the series Matthew Wilcox originally
set in June.  Based on comments from Jan a Brian this now actually
untangles some of the more confusing conditional in the writeback code
before refactoring it into the iterator.  Because of that all the
later patches need a fair amount of rebasing and I've not carried any
reviewed-by over.

The original cover letter is below:

Dave Howells doesn't like the indirect function call imposed by
write_cache_pages(), so refactor it into an iterator.  I took the
opportunity to add the ability to iterate a folio_batch without having
an external variable.

This is against next-20230623.  If you try to apply it on top of a tree
which doesn't include the pagevec removal series, IT WILL CRASH because
it won't reinitialise folio_batch->i and the iteration will index out
of bounds.

I have a feeling the 'done' parameter could have a better name, but I
can't think what it might be.

Diffstat:
 include/linux/pagevec.h   |   18 ++
 include/linux/writeback.h |   19 ++
 mm/page-writeback.c       |  333 +++++++++++++++++++++++++---------------------
 3 files changed, 220 insertions(+), 150 deletions(-)