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    SubjectRe: [RFC PATCH v5 09/10] fs: introduce new helper sync_fs_and_blockdev()
    On Thu, Sep 23, 2021 at 4:08 PM Chengguang Xu <cgxu519@mykernel.net> 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@lst.de/T/

    Thanks,
    Amir.

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