From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gabriel de Perthuis <g2p.code-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: Can't enable writeback
Date: Sat, 17 Aug 2013 12:56:58 +0000 (UTC)
Message-ID: <kunruq$541$1@ger.gmane.org>
References: <520F65C8.8050301@internode.on.net>
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> I try to enable writeback:
> 
>    sudo echo writeback > /sys/block/bcache0/cache_mode
> 
> it returns the error
> 
>    bash: /sys/block/bcache0/cache_mode: No such file or directory

You're confusing bcache0 with bcache0/bcache

    echo writeback |sudo tee -a /sys/block/bcache0/bcache/cache_mode

will work.