Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757074AbYKWHMS (ORCPT ); Sun, 23 Nov 2008 02:12:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751901AbYKWHMI (ORCPT ); Sun, 23 Nov 2008 02:12:08 -0500 Received: from cantor.suse.de ([195.135.220.2]:35426 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751772AbYKWHMG (ORCPT ); Sun, 23 Nov 2008 02:12:06 -0500 Message-ID: <4929023C.2060302@suse.de> Date: Sun, 23 Nov 2008 16:11:56 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.17 (X11/20080922) MIME-Version: 1.0 To: Linux Kernel Mailing List , dwmw2@infradead.org, Nick Piggin , Jens Axboe , IDE/ATA development list , Jeff Garzik , Dongjun Shin , chris.mason@oracle.com, Jens Axboe Cc: Matthew Wilcox Subject: Re: about TRIM/DISCARD support and barriers References: <4928E010.4090801@kernel.org> In-Reply-To: <4928E010.4090801@kernel.org> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1208 Lines: 33 Hello, cc'ing Matthew whom I forgot to cc in the first message. Matthew, the original message is... http://lkml.org/lkml/2008/11/22/260 Tejun Heo wrote: > Dongjun Shin who works for Samsung SSD dep asked me about libata TRIM > support and pointed me to the new DISCARD support David Woodhouse got > merged for 2.6.28. I took a look at the code and blk-layer > interface-wise we seemed to be ready both for filesystems and userland > (so that fsck or something which runs background can mark unused > blocks) but there doesn't seem to be any low level driver which > actually implements ->prepare_discard_fn or fs which sets the DISCARD > flag. Dongjun, the only doc I can find about ATA TRIM is the following one. http://t13.org/Documents/UploadedDocuments/docs2007/e07154r3-Data_Set_Management_Proposal_for_ATA-ACS2.pdf And AFAICS this hasn't made into ACS yet. Is this what you guys are gonna implement and Windows7 is gonna use? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/