linux-ext4 - [PATCH 8/9] btrfs: handle a NULL folio in extent_range_redirty_for

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Date:   Wed, 18 Jan 2023 10:43:28 +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 8/9] btrfs: handle a NULL folio in extent_range_redirty_for_io

filemap_get_folio can return NULL, skip those cases.

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

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d55e4531ffd212..a54d2cf74ba020 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -230,6 +230,8 @@ void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end)
 
 	while (index <= end_index) {
 		folio = filemap_get_folio(mapping, index);
+		if (!folio)
+			continue;
 		filemap_dirty_folio(mapping, folio);
 		folio_account_redirty(folio);
 		index += folio_nr_pages(folio);
-- 
2.39.0