linux-kernel - RE: [PATCH v2 3/5] efi_pstore: Remove a logic erasing entries from a write callback to hold multiple logs

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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D4138899AF@USINDEM103.corp.hds.com>
Date:	Thu, 25 Oct 2012 21:37:50 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Mike Waychison <mikew@...gle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>,
	"Matthew Garrett (mjg@...hat.com)" <mjg@...hat.com>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [PATCH v2 3/5] efi_pstore: Remove a logic erasing entries from
 a write callback to hold multiple logs

> > On the other hand, patch 5/5 changes the format by adding sequence counter.
> > But efi_pstore_read is modied to work correctly in it.
> >
> >         dump-type0-1-1-1351113059-cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
> >
> >         Variable Name: dump-type0-1-1-1351113059
> >         GUID: cfc8fc79-be2e-4ddc-97f0-9f98bfe298a0
> >
> > If I need to elaborate more, please feel free to ask me:) I'm not sure
> > if I understand your question completely.
> 
> In this case, I think efi_pstore_read in patch 5/5 should probably fall-back to trying to do a sscanf(...) == 3 if the sscanf(...) == 4 test fails
> so that dumps for older dumps from previous kernels are still visible to users, no?  They can perhaps get a default count of 0?
> efi_pstore_erase would have to be updated to understand this as well.

OK. I understand your concern.
I will update my patch to work with an old format too.
In addition to efi_pstore_read(), efi_pstore_erase should be modified.

Anyway, I will post a patch v3 later.

Thank you for reviewing.

Seiji
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