linux-ext4 - [PATCH v2 9/11] ext4: Switch to using write_cache

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Message-Id: <20221202183943.22640-9-jack@suse.cz>
Date:   Fri,  2 Dec 2022 19:39:34 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Ritesh Harjani <ritesh.list@...il.com>, Jan Kara <jack@...e.cz>
Subject: [PATCH v2 9/11] ext4: Switch to using write_cache_pages() for data=journal writeout

Instead of using generic_writepages(), let's use write_cache_pages() for
writeout of journalled data. It will allow us to stop providing
.writepage callback. Our data=journal writeback path would benefit from
a larger cleanup and refactoring but that's for a separate cleanup
series.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/inode.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 88772e1ddd3b..d14c6d44bdf1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2705,6 +2705,12 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
 	return err;
 }
 
+static int __writepage(struct page *page, struct writeback_control *wbc,
+		       void *data)
+{
+	return ext4_writepage(page, wbc);
+}
+
 static int ext4_do_writepages(struct mpage_da_data *mpd)
 {
 	struct writeback_control *wbc = mpd->wbc;
@@ -2731,7 +2737,9 @@ static int ext4_do_writepages(struct mpage_da_data *mpd)
 		goto out_writepages;
 
 	if (ext4_should_journal_data(inode)) {
-		ret = generic_writepages(mapping, wbc);
+		blk_start_plug(&plug);
+		ret = write_cache_pages(mapping, wbc, __writepage, mapping);
+		blk_finish_plug(&plug);
 		goto out_writepages;
 	}
 
-- 
2.35.3