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>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f06d058..ca9d4a2 100644 (file)
--- 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));