linux-ext4 - [PATCH 7/9] gfs2: handle a NULL folio in gfs2_jhead_process

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Date:   Wed, 18 Jan 2023 10:43:27 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>
Cc:     linux-afs@...ts.infradead.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-nilfs@...r.kernel.org
Subject: [PATCH 7/9] gfs2: handle a NULL folio in gfs2_jhead_process_page

filemap_get_folio can return NULL, so exit early for that case.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/gfs2/lops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 1902413d5d123e..51d4b610127cdb 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -472,6 +472,8 @@ static void gfs2_jhead_process_page(struct gfs2_jdesc *jd, unsigned long index,
 	struct folio *folio;
 
 	folio = filemap_get_folio(jd->jd_inode->i_mapping, index);
+	if (!folio)
+		return;
 
 	folio_wait_locked(folio);
 	if (folio_test_error(folio))
-- 
2.39.0