From patchwork Tue Sep 6 16:11:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12967797 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 600CEECAAA1 for ; Tue, 6 Sep 2022 16:37:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234075AbiIFQhO (ORCPT ); Tue, 6 Sep 2022 12:37:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238987AbiIFQgs (ORCPT ); Tue, 6 Sep 2022 12:36:48 -0400 Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED7BE2FD for ; Tue, 6 Sep 2022 09:13:11 -0700 (PDT) Received: by mail-ej1-x62c.google.com with SMTP id lx1so24380684ejb.12 for ; Tue, 06 Sep 2022 09:13:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=9aXUsW604JS9V3Fc+GjNX2IX1E1/9dHoWdwhnM48rJ0=; b=Ed2boOrvQ3UGGKJMhcfosQKcKXCTeLogGLhIXbTtUfGc47V5By/VItHpQjUGLdVh7Y WaiyAtnPZKxP83X3wRoxXwu9lDSiYff8qE56Hy2PbbUq6SqLvVmwi371QY/X0V9LxOOn HC00+HgzSSLCDrduqoQhx3wIrRNKNrsPm5rztAAW1Jpr6kcDnX4V5UCwG0F4ke07NEcb 7wA08ACNSdR7jVpmkEYPGMOvZT3vA6OOuezWR3LdGYw3yyaXUCCaOn3hVzTnEapU6CLY PTtI+dEioZ4nfSeLsV6V8FfLZX4XKLMXtx2g1KJ3/Wj3cnnGyKoCuxxnT25t+Nolm9cW XXUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=9aXUsW604JS9V3Fc+GjNX2IX1E1/9dHoWdwhnM48rJ0=; b=sPSmmIzBtY6om0qH0FFVWQGQEYdMn21hloQ8cMaUO+Dxw8ZT32KknR3FFl8xIH6lx5 zQ70Y8lcck3uWGtKr/l49q8EGSF/6S1tIPAl1eYXVlao0SSHo9+nrsBiu25rEMw0jW+k F6V/EoQ+EOG2m3N70ufbbeJIUbTLWZwwFe4CFUO/+nvg7XFZ6p2DU4BU6IfHRn+qBEAt 0kkXxUapXObumpkXYIuFO9joK7/ku4yi+aD8ZBhASRZsdLDbP2+d5WThZekAeKEx9zlL SyYC5RyTXCWzcYTaxvIVzbGL1OkmlDnWPG9zwzkAtB1Rv53dQ5ftpig1bl4ERX6gOIkD YbvQ== X-Gm-Message-State: ACgBeo3yPTEeLW5bhM9WEBap34YWsx8KOtEx0OfFOISa0dOSjtNTmdnZ uelwahE5ms04QiyxRqlxwLv51dEHMq4= X-Google-Smtp-Source: AA6agR6kRxu6FmfcFXDO1eHyyCq0jZd380XWPCPyxZVi0mQdn684uU3BwT+vuNkmoGIntsiiL5XtXQ== X-Received: by 2002:a17:907:720b:b0:731:6e49:dc93 with SMTP id dr11-20020a170907720b00b007316e49dc93mr40827369ejc.421.1662480790228; Tue, 06 Sep 2022 09:13:10 -0700 (PDT) Received: from 127.0.0.1localhost.com ([2620:10d:c092:600::2:1bab]) by smtp.gmail.com with ESMTPSA id kw16-20020a170907771000b007512bf1b7ecsm6556385ejc.118.2022.09.06.09.13.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Sep 2022 09:13:09 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [PATCH 1/2] io_uring/kbuf: fix not advancing READV kbuf ring Date: Tue, 6 Sep 2022 17:11:16 +0100 Message-Id: X-Mailer: git-send-email 2.37.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org When we don't recycle a selected ring buffer we should advance the head of the ring, so don't just skip io_kbuf_recycle() for IORING_OP_READV but adjust the ring. Fixes: 934447a603b22 ("io_uring: do not recycle buffer in READV") Signed-off-by: Pavel Begunkov Reviewed-by: Dylan Yudaken --- io_uring/kbuf.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/io_uring/kbuf.h b/io_uring/kbuf.h index d6af208d109f..746fbf31a703 100644 --- a/io_uring/kbuf.h +++ b/io_uring/kbuf.h @@ -91,9 +91,13 @@ static inline void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) * buffer data. However if that buffer is recycled the original request * data stored in addr is lost. Therefore forbid recycling for now. */ - if (req->opcode == IORING_OP_READV) + if (req->opcode == IORING_OP_READV) { + if ((req->flags & REQ_F_BUFFER_RING) && req->buf_list) { + req->buf_list->head++; + req->buf_list = NULL; + } return; - + } if (req->flags & REQ_F_BUFFER_SELECTED) io_kbuf_recycle_legacy(req, issue_flags); if (req->flags & REQ_F_BUFFER_RING)