From patchwork Tue Dec 15 00:20:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 11973445 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 42D39C4361B for ; Tue, 15 Dec 2020 00:29:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1ABD922258 for ; Tue, 15 Dec 2020 00:29:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727648AbgLOAYu (ORCPT ); Mon, 14 Dec 2020 19:24:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725976AbgLOAYp (ORCPT ); Mon, 14 Dec 2020 19:24:45 -0500 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D32DC06179C; Mon, 14 Dec 2020 16:24:05 -0800 (PST) Received: by mail-wr1-x441.google.com with SMTP id c5so14509321wrp.6; Mon, 14 Dec 2020 16:24:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=LOsfOtb4JF9iqyizeOjm4tVRPPo2GoTdvRn37AEB3XM=; b=kG976mlGUAT54hMTsT4qHl3ePNNRWB9LFy2HmmL+t6mfRSKdk5umZ6WYomCULDQW9E YuWby+j3W4gWivHpVQQOA/7aIwmkSSLngHeQdb6klQaCptqFG/YV5ejnTwIwlz9HFf2m eDUwq7Rwt+h66HV9wnAS1sesppf+Fpl+3qYXxpDR3ZoWJ27/ZiY4pBb1I/35pIXw34kB Lbi1nxTdy0WE+OGKwC0NKqucdKqyJIKuQSjNNW99pLcDkW/m1CtBI/gMiqbPxZ8kxwzH aobpyU6IKfyxV7UT1aOSZWNXNJ0RQdHNyYaHbm5kYkm08wWJNvMk2ZyFR9EbrghRw0A9 lUHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=LOsfOtb4JF9iqyizeOjm4tVRPPo2GoTdvRn37AEB3XM=; b=LyijsfZas5MN+fpGuiUTO2FGEottJJAESBvtic/a74zNus+hT0RmsfyFSUK/1AXLtt BwgEPKOIqMUawCsaUeJe51wCCKbEmIToRqcdSeH2QD1JSSYG5p/YBvOxfjeSECtGAXq2 gaBQBFsBPryLWtXPTZAWW9n8eWtbZhDL/LkhpxirHRb5ht4e6rkIoXbqkS3yA8YQjJdd bipuX84mikhLIsUMWpzLhPqdcBsjnQgpRyTwvGIdst0+EEX6rIR3gT1e9LBoNpQi/Hts PnMYShvisPWzWcwRMaO2qozvZkWs5mgJ0KetUkMRSjTv5yD8I8wYmLbSgDK1+fwYNfrs R8Kw== X-Gm-Message-State: AOAM5314kP+8hivUKxxpB6HXY4NsKLXshXfQw7XVXM4vuxIrcGrtOATG Y7GlEtTcTvO6jv7s3urnRORnRks6gjzeGgEL X-Google-Smtp-Source: ABdhPJz/AygAoS74uaniu7lJWQGPmncFabpUEeaVcLaoDdNn4iTUPpmUbiF5aWlFvAES8KDtC5RTLg== X-Received: by 2002:a5d:4c4e:: with SMTP id n14mr31759423wrt.209.1607991843559; Mon, 14 Dec 2020 16:24:03 -0800 (PST) Received: from localhost.localdomain ([85.255.232.163]) by smtp.gmail.com with ESMTPSA id b19sm5362012wmj.37.2020.12.14.16.24.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Dec 2020 16:24:03 -0800 (PST) From: Pavel Begunkov To: linux-block@vger.kernel.org Cc: Jens Axboe , Christoph Hellwig , Matthew Wilcox , Ming Lei , Johannes Weiner , Alexander Viro , "Darrick J . Wong" , "Martin K . Petersen" , Jonathan Corbet , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-doc@vger.kernel.org, Christoph Hellwig Subject: [PATCH v1 1/6] target/file: allocate the bvec array as part of struct target_core_file_cmd Date: Tue, 15 Dec 2020 00:20:20 +0000 Message-Id: X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Christoph Hellwig This saves one memory allocation, and ensures the bvecs aren't freed before the AIO completion. This will allow the lower level code to be optimized so that it can avoid allocating another bvec array. Signed-off-by: Christoph Hellwig Signed-off-by: Pavel Begunkov --- drivers/target/target_core_file.c | 20 ++++++-------------- 1 file changed, 6 insertions(+), 14 deletions(-) diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index b0cb5b95e892..cce455929778 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -241,6 +241,7 @@ struct target_core_file_cmd { unsigned long len; struct se_cmd *cmd; struct kiocb iocb; + struct bio_vec bvecs[]; }; static void cmd_rw_aio_complete(struct kiocb *iocb, long ret, long ret2) @@ -268,29 +269,22 @@ fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, struct target_core_file_cmd *aio_cmd; struct iov_iter iter = {}; struct scatterlist *sg; - struct bio_vec *bvec; ssize_t len = 0; int ret = 0, i; - aio_cmd = kmalloc(sizeof(struct target_core_file_cmd), GFP_KERNEL); + aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL); if (!aio_cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); - if (!bvec) { - kfree(aio_cmd); - return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - } - for_each_sg(sgl, sg, sgl_nents, i) { - bvec[i].bv_page = sg_page(sg); - bvec[i].bv_len = sg->length; - bvec[i].bv_offset = sg->offset; + aio_cmd->bvecs[i].bv_page = sg_page(sg); + aio_cmd->bvecs[i].bv_len = sg->length; + aio_cmd->bvecs[i].bv_offset = sg->offset; len += sg->length; } - iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len); + iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len); aio_cmd->cmd = cmd; aio_cmd->len = len; @@ -307,8 +301,6 @@ fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, else ret = call_read_iter(file, &aio_cmd->iocb, &iter); - kfree(bvec); - if (ret != -EIOCBQUEUED) cmd_rw_aio_complete(&aio_cmd->iocb, ret, 0);