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 e9be396..186adbf 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1866,6 +1866,8 @@
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 @@
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)
