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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CB83C77B7A for ; Wed, 17 May 2023 02:32:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231981AbjEQCcF (ORCPT ); Tue, 16 May 2023 22:32:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230078AbjEQCcD (ORCPT ); Tue, 16 May 2023 22:32:03 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AFB310E3 for ; Tue, 16 May 2023 19:32:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9BB18640C7 for ; Wed, 17 May 2023 02:32:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D72EC433EF; Wed, 17 May 2023 02:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684290722; bh=EGWWvTtIz/wefBtSbQjyXbGccmk7EVTm65ykgv4tinQ=; h=Date:Subject:To:References:From:In-Reply-To:From; b=JZH/SIc3l8kO4VCTPoT1GAbA53InelUdM05t7DUEP7A85TszHsbe2z7LoVUIPDMno sHQ+LsphgUkO0H1IavoQUOjYM4HYMj92ouwYS6ePPjqmYnZRxKWK+M/ApYZYyNp7Xr QygGe3TAOW1sCUUvW7uqwwfg8oW+k2cxqsfKPmDtJI0VR9SgQAJ2CyBxW+JPwYw0rQ JTlPLUBy1kk/or+3s3Wbge7A1GHgP3vIJwwqc8k3jyO59Pm5oW/hGc/NgF4ImQuXju HgJd/7hH0+aDobDheNoBDL6XauiiPKPpT41srRH0gqCQNWBjhvk3//HCNSrQa/RXlK tCqLXe+3f2ISg== Message-ID: Date: Wed, 17 May 2023 10:32:00 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [f2fs-dev] Is compression available under direct-io mode? Content-Language: en-US To: Sijie Lan , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: From: Chao Yu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2023/5/12 9:10, Sijie Lan wrote: > Hi, guys, > > When I do some specific test scenarios, I want to do some direct write > after data have been compressed in F2FS, but when I track the internal > functions, it seems F2FS forces my direct-io request to buffer-io > mode. Does it mean we can not do the write direct-io if we applied the Yes, compression feature depends on page cache. Thanks, > compression feature? In other words, must f2fs use an inside buffer to > provide compression functions? > > > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel