udf: Write LVID to disk after opening / closing

So far we just marked the buffer as dirty and left writing on flusher thread
but especially on opening that opens possible race window where we could write
other modified fs structures to disk before we mark filesystem as open. So sync
LVID buffer to disk after opening and closing fs.

Reported-by: Steve Nickel <snickel58@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/super.c b/fs/udf/super.c
index e9be396a558d944fde7086cce64d22c672cdc5b7..186adbf94b20b770ce29f7bf503f48c20eac2e3b 100644 (file)
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1866,6 +1866,8 @@ static void udf_open_lvid(struct super_block *sb)
        mark_buffer_dirty(bh);
        sbi->s_lvid_dirty = 0;
        mutex_unlock(&sbi->s_alloc_mutex);
+       /* Make opening of filesystem visible on the media immediately */
+       sync_dirty_buffer(bh);
 }
 
 static void udf_close_lvid(struct super_block *sb)
@@ -1906,6 +1908,8 @@ static void udf_close_lvid(struct super_block *sb)
        mark_buffer_dirty(bh);
        sbi->s_lvid_dirty = 0;
        mutex_unlock(&sbi->s_alloc_mutex);
+       /* Make closing of filesystem visible on the media immediately */
+       sync_dirty_buffer(bh);
 }
 
 u64 lvid_get_unique_id(struct super_block *sb)