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When unpacking the initramfs or when mounting block devices we need to ensure that any delayed fput() finished to prevent spurious errors. The init process can be a proper kernel thread or a user mode helper. In the latter case PF_KTHREAD isn't set. So we need to do both flush_delayed_work() and task_work_run(). Since we'll port block device opening and closing to regular file open and closing we need to ensure the same as for the initramfs. So just make that a little helper. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Srikanth Aithal <sraithal@amd.com> Link: https://lore.kernel.org/r/CA+G9fYttTwsbFuVq10igbSvP5xC6bf_XijM=mpUqrJV=uvUirQ@mail.gmail.com Signed-off-by: Christian Brauner <brauner@kernel.org>