From: "Martin K. Petersen" Subject: Re: Is it possible for the ext4/btrfs file system to pass some context related info to low level block driver? Date: Tue, 03 May 2011 09:43:29 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Cc: "linux-btrfs\@vger.kernel.org" , "linux-ext4\@vger.kernel.org" , "linux-fsdevel\@vger.kernel.org" , "linux-mmc\@vger.kernel.org" To: "Gao\, Yunpeng" Return-path: Received: from rcsinet10.oracle.com ([148.87.113.121]:46505 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752547Ab1ECNnm (ORCPT ); Tue, 3 May 2011 09:43:42 -0400 In-Reply-To: (Yunpeng Gao's message of "Tue, 3 May 2011 10:44:07 +0800") Sender: linux-ext4-owner@vger.kernel.org List-ID: >>>>> "Yunpeng" == Gao, Yunpeng 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