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

Google-Bug-Id: 20939131
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f06d0589ddba..ca9d4a2fed41 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));