linux-kernel - Re: Correct way to remove a cache device?

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Message-ID: <CAHnuAexhYVpBg3Hq9i79Yt7LmiAxaf=ZDFR14=EOQCd8HiwyuA@mail.gmail.com>
Date:	Tue, 1 Apr 2014 09:01:55 +0200
From:	Daniel Smedegaard Buus <danielbuus@...il.com>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	Kent Overstreet <kmo@...erainc.com>,
	Nicholas Swenson <nks@...erainc.com>,
	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Correct way to remove a cache device?

I couldn't figure out a predictable way to detach it properly. Even
when doing it as early as possible in the boot sequence, it'd succeed
anywhere from the first time I tried to seven reboots later.

I actually ended up doing something very nasty, but very efficient: I
simply dd zeroes to the beginning of the cache device, then reboot,
and the kernel would no longer recognize the cache device, and I could
continue normally.

Not pretty by any standard (actually makes me feel like showering),
but it works ;)
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