linux-ext4 - Re: Is it possible for the ext4/btrfs file system to pass some context related info to low level block driver?

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Message-ID: <yq1mxj32932.fsf@sermon.lab.mkp.net>
Date:	Tue, 03 May 2011 09:43:29 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	"Gao\, Yunpeng" <yunpeng.gao@...el.com>
Cc:	"linux-btrfs\@vger.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-ext4\@vger.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-fsdevel\@vger.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mmc\@vger.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: Is it possible for the ext4/btrfs file system to pass some context related info to low level block driver?

>>>>> "Yunpeng" == Gao, Yunpeng <yunpeng.gao@...el.com> writes:

Yunpeng> So, my question is, is there any plan or discussion on
Yunpeng> supporting this feature (passing data type info to low level
Yunpeng> block device driver) on file system developments? Especially
Yunpeng> for ext4/btrfs, since now they are very hot in Linux? Thanks.

Yes, I have been working on some changes that allow us to tag bios and
pass the information out to storage. These patches have been on the back
burner for a while due to other commitments. But I'll dig them out and
post them later. We just discussed them a couple of weeks ago at the
Linux Storage Workshop.

In the meantime: Can you point me to the relevant eMMC stuff so I can
see how many tiers or classes we have to work with there?

-- 
Martin K. Petersen	Oracle Linux Engineering
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