linux-kernel - RE: [PATCH 0/2] make all stored entries accessible.

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Date:	Thu, 31 Oct 2013 20:22:03 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Seiji Aguchi <seiji.aguchi@....com>, Madper Xie <bbboson@...il.com>
CC:	Madper Xie <cxie@...hat.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"anton@...msg.org" <anton@...msg.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/2] make all stored entries accessible.

>> 1. combine timestamp, count and part into "id".
>>    for now, in efi-pstore.c, *id = part. and we could simply change it
>>    to unique one. F.E. *id = (timestamp * 100 + part) * 100 + count.
>
> My opinion close to 1.
> But, the "*id" should not be the complex one like (timestamp * 100 + part) * 100 + count.
> Rather, it should be a simple sequential number beginning with 1.

I also like option 1 ... but I think the "id" should be a persistent value for
a given saved record.  So some func(timestamp, part, count) would be a
good idea.  If we try using "sequential" numbers - and don't manage to
clear out /sys/fs/pstore each time - then we may have the same "dmesg"
file show up with different names on each boot.

Right now I have a simple script to save & clear ... not much more
complex than:

	cd /sys/fs/pstore
	cp * /var/log/save-pstore
	rm *

This depends on not re-using filenames (otherwise new files in pstore
might overwrite older saved files in my /var/log/save-pstore area).

-Tony
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