[PATCH] ext4: don't save the error information if the block device is read-only

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Google-Bug-Id: 20939131
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
---
 fs/ext4/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f06d058..ca9d4a2 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -294,6 +294,8 @@ static void __save_error_info(struct super_block *sb, const char *func,
 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 
 	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
+	if (bdev_read_only(sb->s_bdev))
+		return;
 	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 	es->s_last_error_time = cpu_to_le32(get_seconds());
 	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
-- 
2.3.0

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