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The aim of .flush fop is to hint file-system that flushing its state or caches or any other important data to reliable storage would be desirable now. fuse_flush() passes this hint by sending FUSE_FLUSH request to userspace. However, dirty pages and pages under writeback may be not visible to userspace yet if we won't ensure it explicitly. Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>