On Thu, Sep 23, 2021 at 4:08 PM Chengguang Xu <cgxu519@xxxxxxxxxxxx> wrote: > > Overlayfs needs to call upper layer's ->sync_fs > and __sync_blockdev() to sync metadata during syncfs(2). > > Currently, __sync_blockdev() does not export to module > so introduce new helper sync_fs_and_blockdev() to wrap > those operations. Heads up: looks like __sync_blockdev() will be gone soon, but you will have other exported symbols that overlayfs can use https://lore.kernel.org/linux-fsdevel/20211019062530.2174626-1-hch@xxxxxx/T/ Thanks, Amir.
