Message-ID: <1337062917.2528.109.camel@sauron.fi.intel.com>
Subject: Re: [PATCH] UBIFS: add crypto lookup field to tree node cache
From: Artem Bityutskiy <dedekind1@gmail.com>
Reply-To: dedekind1@gmail.com
To: Joel Reardon <joel@clambassador.com>
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Date: Tue, 15 May 2012 09:21:57 +0300
In-Reply-To: <alpine.DEB.2.00.1205111323010.17715@eristoteles.iwoars.net>
References: <alpine.DEB.2.00.1205111323010.17715@eristoteles.iwoars.net>
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On Fri, 2012-05-11 at 13:24 +0200, Joel Reardon wrote:
> This patch adds a new field to the TNC's zbranch and allows it to be set =
when
> a node is added or replaced. The field is called 'crypto_lookup' and it r=
efers
> to a location in the key storage area---a pointer to a key that is used t=
o
> encrypt/decrypt the data node. It can be set to 0 or a negative number wh=
en it
> is not being used. When a new node is added, this value is passed and set
> When a node is replace, the old value is replaced with the new value.
>=20
> These values will be used in future patchs. Replacing a
> crypto_lookup value will also mark the old value as deleted and the new v=
alue
> as used; adding a new node will mark the value as used. Additionally, del=
eting
> or removing TNC nodes will mark the values as deleted.
>=20
> TNC's crypto_lookup values are not stored on disk. They will be stored in=
 the
> data
> node's header. Therefore, if a crypto_lookup value is invalid (but a vali=
d one
> is to be expected and needs to be used) then a function will be added tha=
t
> reads the data node to
> obtain the value. Additionally, when a data node is ever read, the
> crypto_lookup position that is read will be set in the corresponding zbra=
nch.
>=20
> The values are not stored on disk to avoid having different on-disk forma=
ts of
> the the ubifs_branch structure.
>=20
> Signed-off-by: Joel Reardon <reardonj@inf.ethz.ch>

Pushed to the "joel" branch, thanks!

--=20
Best Regards,
Artem Bityutskiy

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