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Date:	Thu, 19 Jun 2014 23:42:56 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Liu hua <sdu.liu@...wei.com>,
	"anton@...msg.org" <anton@...msg.org>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Wang Nan <wangnan0@...wei.com>,
	"peifeiyue@...wei.com" <peifeiyue@...wei.com>
Subject: RE: Should Pstore(ramoops) records customized information?

> BTW, I note that "extern struct pstore_info *psinfo" locates in
> fs/pstore/internal.h. So users out of directory "fs/pstore/" can not use pstore to
> record messages. We do not want other kernel users to use pstore, right?  And can we
> break this?

Yes we can make some interface visible to the rest of the kernel ... probably
not the raw "*psinfo" though. Perhaps the pstore_alloc_ring_buffer() and
pstore_write_ring_buffer() functions should be the ones exported to the
rest of the kernel.

> ditoo.. Since other backends like efi and erst may can not privide such ring buffer.
> So pstore_alloc_ring_buffer should be a funciton pointer of pstore_info struct.

Yes - that allows less capable backend like ERST and efivars to not provide the
service.  Since it becomes internal, you can drop the "pstore_" prefix.  E.g.
something like:

int pstore_alloc_ring_buffer(char *name, int size)
{
	return psinfo->alloc_ring_buffer(name, size);
}
EXPORT_SYMBOL_GPL(pstore_alloc_ring_buffer);

... and you have to find/make some global header for the "extern" declaration.

-Tony


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