linux-ext4 - [PATCH 07/11] ext4: Warn on read-only filesystem in ext4_journal_check

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Date:   Fri, 16 Jun 2023 18:50:53 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 07/11] ext4: Warn on read-only filesystem in ext4_journal_check_start()

Now that filesystem abort marks the filesystem as shutdown, we shouldn't
be ever hitting the sb_rdonly() check in ext4_journal_check_start().
Since this is a suitable place for catching all sorts of programming
errors, convert the check to WARN_ON instead of dropping it.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/ext4_jbd2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index b72a22a57d20..ca0eaf2147b0 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -70,8 +70,9 @@ static int ext4_journal_check_start(struct super_block *sb)
 	if (unlikely(ext4_forced_shutdown(sb)))
 		return -EIO;
 
-	if (sb_rdonly(sb))
+	if (WARN_ON_ONCE(sb_rdonly(sb)))
 		return -EROFS;
+
 	WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
 	journal = EXT4_SB(sb)->s_journal;
 	/*
-- 
2.35.3