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Theorem refine-fsync

ofh = abs-of(of), fs = abs-files(files), abs(root, ROOT_INO)(dirs), psynced → asynced, root.dir?, fids-cons(root, fs, ofh), of-cons(of, dirs, files), dom of < ino, afs-cons(dirs, files) ⊦ ⟪vfs_fsync#(path, isdir, user, dirs, files; asynced; err)⟫ ⟨posix_fsync#(path, isdir, user, root, fs, ofh; ; psynced, err0)⟩ ((ofh = abs-of(of) ∧ fs = abs-files(files) ∧ abs(root, ROOT_INO)(dirs) ∧ (psynced → asynced)) ∧ err = err0)

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