linux-kernel - Re: [RFC,PATCH] efi: Add support for a UEFI variable filesystem

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Date:	Thu, 30 Aug 2012 19:36:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
CC:	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Matt Domsch <Matt_Domsch@...l.com>
Subject: Re: [RFC,PATCH] efi: Add support for a UEFI variable filesystem

Wouldn't that be better handled by O_APPEND?



Jeremy Kerr <jeremy.kerr@...onical.com> wrote:

>Hi hpa,
>
>Thanks for the review!
>
>> However, I have a question... rather than putting the attributes as
>the
>> first data bytes, would it be better to make it either part of the
>> filename (assuming there is at least one character other than / which
>> can be reasonably relied upon to not be part of the name); for
>example:
>>
>> 	LangCodes,BS,RT
>>
>> ... or ...
>>
>> 	LangCodes,6
>
>This will get tricky when handling EFI_VARIABLE_APPEND_WRITE: this 
>attribute will never appear in the attributes returned by
>GetVariable(), 
>but may be passed to SetVariable(). If we put attributes in the 
>filename, we'd need to handle writes to both names, and/or have 
>duplicate dentries for each variable. We could do it, but the
>filesystem 
>interface might be a little messy.
>
>[Supporting append writes is essential for key database updates, which 
>may be signed]
>
>Cheers,
>
>
>Jeremy

-- 
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