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From: Christoph Hellwig <hch@lst.de>
To: linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Jan Kara <jack@suse.com>,
	David Howells <dhowells@redhat.com>,
	Brian Foster <bfoster@redhat.com>,
	linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 16/17] writeback: Remove a use of write_cache_pages() from do_writepages()
Date: Mon, 18 Dec 2023 16:35:52 +0100
Message-Id: <20231218153553.807799-17-hch@lst.de>
In-Reply-To: <20231218153553.807799-1-hch@lst.de>
References: <20231218153553.807799-1-hch@lst.de>
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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

Use the new for_each_writeback_folio() directly instead of indirecting
through a callback.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 mm/page-writeback.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index fbffd30a9cc93f..d3c2c78e0c67ce 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2564,13 +2564,21 @@ int write_cache_pages(struct address_space *mapping,
 }
 EXPORT_SYMBOL(write_cache_pages);
 
-static int writepage_cb(struct folio *folio, struct writeback_control *wbc,
-		void *data)
+static int writeback_use_writepage(struct address_space *mapping,
+		struct writeback_control *wbc)
 {
-	struct address_space *mapping = data;
-	int ret = mapping->a_ops->writepage(&folio->page, wbc);
-	mapping_set_error(mapping, ret);
-	return ret;
+	struct blk_plug plug;
+	struct folio *folio;
+	int err;
+
+	blk_start_plug(&plug);
+	for_each_writeback_folio(mapping, wbc, folio, err) {
+		err = mapping->a_ops->writepage(&folio->page, wbc);
+		mapping_set_error(mapping, err);
+	}
+	blk_finish_plug(&plug);
+
+	return err;
 }
 
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
@@ -2586,12 +2594,7 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 		if (mapping->a_ops->writepages) {
 			ret = mapping->a_ops->writepages(mapping, wbc);
 		} else if (mapping->a_ops->writepage) {
-			struct blk_plug plug;
-
-			blk_start_plug(&plug);
-			ret = write_cache_pages(mapping, wbc, writepage_cb,
-						mapping);
-			blk_finish_plug(&plug);
+			ret = writeback_use_writepage(mapping, wbc);
 		} else {
 			/* deal with chardevs and other special files */
 			ret = 0;
-- 
2.39.2