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[2620:137:e000::1:20]) by mx.google.com with ESMTP id f71-20020a636a4a000000b0043941e5532dsi13473056pgc.391.2022.12.04.21.58.46; Sun, 04 Dec 2022 21:59:09 -0800 (PST) Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=HMEOq0pa; spf=pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231393AbiLEFoU (ORCPT + 99 others); Mon, 5 Dec 2022 00:44:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231349AbiLEFoT (ORCPT ); Mon, 5 Dec 2022 00:44:19 -0500 Received: from mail-oa1-x29.google.com (mail-oa1-x29.google.com [IPv6:2001:4860:4864:20::29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 983056400 for ; Sun, 4 Dec 2022 21:44:18 -0800 (PST) Received: by mail-oa1-x29.google.com with SMTP id 586e51a60fabf-14449b7814bso7340894fac.3 for ; Sun, 04 Dec 2022 21:44:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=wMq2tf2ShcsNl+2tdhGNSD1zJfbMMgZKuh64RqXis70=; b=HMEOq0paowfg15cOBn/I51q5Db4h+QbKKHDl9ikzS4HwT9TDv+ZpiR4rXcHA5Th5Lp DgYMFJBBpN0fnoVeusSBPNkakF48m7h2iLfWvo1P6VVGlkq5jmGmVqAwYRtbGdiU7tZ1 SADyJCQ3dd9KZ+qV26B7zJL7/QsVjFaEWLEAEMj+go/SAsKFC9RMVmC3K19Uu8YNzXqp aVXgJyIApgPlW4SduWqnrYjI80AKPB5/3bYr3qufnMWWERjBfBAjuT2mz9v9X0vTZ8FZ aD6LbxQzERXJEuloYbXV9SBVRdmupfg347ZIYkb65tRtu4Lqq/XyEHrE2Ogn2qVshHhW YDQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wMq2tf2ShcsNl+2tdhGNSD1zJfbMMgZKuh64RqXis70=; b=ZzJSd7MiWNTvVawkTHNYNu0qxcuqcTLplxzK7e/2qs6DVdfpusBhXdCqbC0IMlS79c imQCnT8LICm31Pg+wrKapZ1jDuX3HwaOee6EQNVH+dapq0SxYCY1e8TXhcLzjE7O4HdQ NGsHlvu8ch+/VcmoSWRn8CQ9OG/0LrGzqaguR8YJyh8HcNEoRthM8rlcY3elOoetwyNP k8ejVXRdPkK0DL3LuhobJduwr2NzI1sK4NwnvaHk2kMOpiD6D3MvOz9e9qEnLaNpDSJk WfpkALZz02DKa4Q6gtlmc7/UPU5Y7oZ0ZsfFxSy+Uioidu2t7wuqD/Dos3HQnXC2fAxk rEWw== X-Gm-Message-State: ANoB5pmrd6qHBq6K3e2leN4Gtf+kzpVTEHNGZCkkoflccTHyysBAIKLf IVDxp4c8pSZt1asvXHeJeJUIueizyJ+qowM8ENFsgLinwXE1dA== X-Received: by 2002:a05:6870:c352:b0:132:d3f8:bad4 with SMTP id e18-20020a056870c35200b00132d3f8bad4mr37442553oak.58.1670219057775; Sun, 04 Dec 2022 21:44:17 -0800 (PST) MIME-Version: 1.0 From: Jidong Xiao Date: Sun, 4 Dec 2022 22:44:07 -0700 Message-ID: Subject: Is Linux NFS block size 512 bytes or is this a bug? To: linux-nfs@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Hi, I saw this line in fs/nfsd/nfs3xdr.c: /* used */ p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); It seems we are left-shifting the blocks 9 bits, to get the number of bytes used. Is this a bug or we know the block size is always 512 bytes? -Jidong