From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A108C04AB1 for ; Mon, 13 May 2019 07:17:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2A6020578 for ; Mon, 13 May 2019 07:17:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727796AbfEMHRa (ORCPT ); Mon, 13 May 2019 03:17:30 -0400 Received: from mx2.suse.de ([195.135.220.15]:37848 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727568AbfEMHRa (ORCPT ); Mon, 13 May 2019 03:17:30 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id AFA2BAE34; Mon, 13 May 2019 07:17:29 +0000 (UTC) Date: Mon, 13 May 2019 09:17:29 +0200 From: Johannes Thumshirn To: Chris Mason Cc: David Sterba , Linux BTRFS Mailinglist Subject: Re: [PATCH 14/17] btrfs: directly call into crypto framework for checsumming Message-ID: <20190513071729.GD12653@x250> References: <20190510111547.15310-1-jthumshirn@suse.de> <20190510111547.15310-15-jthumshirn@suse.de> <18303EEF-24F1-40BB-9448-A55324AA119A@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Fri, May 10, 2019 at 01:54:30PM +0000, Chris Mason wrote: > Looking at the callers of btrfs_csum_final() and btrfs_csum_data(), lets > just pass the shash_desc from the callers. That way you don't have to > poke at memcpy and shash_desc_ctx(). I wanted to avoid spreading knowledge about the crypto api to deep into the filesystem. I'd actually loved to have something akin to ubifs' ubifs_info::log_hash but wasn't really sure how to handle concurrency. > I'm a little worried about stack usage (at least 360 bytes), but worst > case we can do some percpu gymnastics. > > -chris -- Johannes Thumshirn SUSE Labs Filesystems jthumshirn@suse.de +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Mary Higgins, Sri Rasiah HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850