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[147.75.199.223]) by mx.google.com with ESMTPS id vq18-20020a05620a559200b007854ea5fbcbsi1078577qkn.549.2024.02.07.05.34.37 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 05:34:37 -0800 (PST) Received-SPF: pass (google.com: domain of linux-nfs+bounces-1814-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=NN9zccGW; arc=pass (i=1 dkim=pass dkdomain=kernel.org); spf=pass (google.com: domain of linux-nfs+bounces-1814-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-nfs+bounces-1814-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 57F021C2164A for ; Wed, 7 Feb 2024 13:34:37 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 31CFF76C99; Wed, 7 Feb 2024 13:34:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NN9zccGW" X-Original-To: linux-nfs@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D3C876C98 for ; Wed, 7 Feb 2024 13:34:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707312875; cv=none; b=sOKrlQgOp/oSouLg7vuIdHXuBvyHxr5rL6Bf+lbJPEKMZzsmuTaUwJ2Fl5Eyjnpd33DQmJjY3MVH40PMY8xzmrPBwkjFoMoYZg7WnqbOs1buJoquezjfpsUuEEHXFxLZcJTbuoiIpL8JC39JQDF/wfbOpBqo5GmRrOyz//U3NM8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707312875; c=relaxed/simple; bh=Qxi4+VTFYj/InmyR+/ZDxG9veJQZ3x7IbJ+ZtD7l73k=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=THzNoxxgrBH6BBTrMSpI3wc82RLIXeIH0pnaY3XtfyP6tOV2fWUy4TFGis6XnoY/miyfGbo4Z+4tZ9HZ8vvXFny80xelhiwO92MAmfrqZb0kgJpx/irFJbSdRKygYbbdSmhWwqNEalRmfRdL86uQ2uhR5ZRCRabGQr53Pnb4/ow= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NN9zccGW; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B7DBC433F1; Wed, 7 Feb 2024 13:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707312874; bh=Qxi4+VTFYj/InmyR+/ZDxG9veJQZ3x7IbJ+ZtD7l73k=; h=Subject:From:To:Cc:Date:From; b=NN9zccGWiM24YG2YtMXYMvL8i+R6f5JWAW0ofRrflKxL9CflBZ1y8rWVcwvUV0hDw tJhkjxRGHL29Vjj+XLZlAN2qw9Esojo28L8KNjsUe+uFMrPmmHkarnWRgOIgKhU8g3 PEAr4IMrM6WfR+Hl05snC9+n2rbSD9C2uwutD8oYrEZwVaOQCzmNW6TZZR699bvJt5 X9G9dw89LWZ1hzO7WM9Uj4MhDyD8NVWTOw27YZFJ0ywL18y4t4tPxkOeljenp2sVPp bvo289E8eqkQ2B5r8ZSJkeEbWnACYER3vFEIgwGsvqMrcz70xwMQvegZruwRUkO67G AdONBqxJKUiLg== Message-ID: <57b9f5e0c3ec7bc09044b016a3822d0700760c55.camel@kernel.org> Subject: when should the client request a directory delegation? From: Jeff Layton To: linux-nfs Cc: Rick Macklem Date: Wed, 07 Feb 2024 08:34:32 -0500 Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 I've started work on a patchset to add support for directory delegations to the Linux kernel client and server. It's still too rough to post at this point, and for now, I'm just cobbling in a ioctl to drive it. As I started working on some of the client bits, however, I realized that I don't really have a clear picture as to when the client should request a delegation on a directory. It seems like there are a lot of things we could do: One idea: request one on an initial directory readdir. So maybe when the offset is 0 and we don't have a dir delegation already, do: PUTFH:GET_DIR_DELEGATION:READDIR Or, maybe just do it on any readdir when we haven't requested one in a little while? We could also do one on every lookup, when we expect that the result will be a directory. I'm not sure if LOOKUP_DIRECTORY would be a sufficient indicator or if we'd need the vfs to indicate that with a new flag. Would we also want to request one after a mkdir? PUTFH:CREATE:GET_DIR_DELEGATION:GETFH:GET_DIR_DELEGATION:... Assuming we can get this all working, what should drive the client to issues GET_DIR_DELEGATION ops? --=20 Jeff Layton