linux-kernel - [PATCH 5/6] fs: don't call ->writepage from __mpage

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Date:   Mon, 13 Jun 2022 07:37:14 +0200
From:   Christoph Hellwig <hch@....de>
To:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.com>,
        Dave Kleikamp <shaggy@...nel.org>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, jfs-discussion@...ts.sourceforge.net,
        ntfs3@...ts.linux.dev
Subject: [PATCH 5/6] fs: don't call ->writepage from __mpage_writepage

All callers of mpage_writepage use block_write_full_page as their
->writepage implementation when called from mpage_writepages
(although for ntfs3 this is obsfucated a bit).

Just call block_write_full_page directly instead of going through
the ->writepage indirection.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/mpage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/mpage.c b/fs/mpage.c
index 31a97a0acf5f5..a354ef2b4b4eb 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -624,7 +624,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
 	/*
 	 * The caller has a ref on the inode, so *mapping is stable
 	 */
-	ret = mapping->a_ops->writepage(page, wbc);
+	ret = block_write_full_page(page, mpd->get_block, wbc);
 	mapping_set_error(mapping, ret);
 out:
 	mpd->bio = bio;
-- 
2.30.2