From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [RFC][PATCH] mmc: add an ioctl for erasing Date: Mon, 31 May 2010 04:47:09 -0400 Message-ID: <20100531084709.GA7784@infradead.org> References: <4BF68EFC.70101@nokia.com> <20100521140714.GB15070@infradead.org> <4C037731.5030301@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from bombadil.infradead.org ([18.85.46.34]:60319 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754459Ab0EaIrM (ORCPT ); Mon, 31 May 2010 04:47:12 -0400 Content-Disposition: inline In-Reply-To: <4C037731.5030301@nokia.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Adrian Hunter Cc: Christoph Hellwig , Andrew Morton , "linux-mmc@vger.kernel.org" , LKML On Mon, May 31, 2010 at 11:45:37AM +0300, Adrian Hunter wrote: > Sorry for the slow reply, I have been away. > > Connecting erase to discard was rejected for performance reasons in 2008. > Refer: > > http://thread.gmane.org/gmane.linux.file-systems/25378/focus=25606 The discard implementation changed a lot since those days. Discard requests now have their own request size limitation which is separate form that for normal requests, and we also store the alignment requirement for them separately.