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 9AE09C77B6E for ; Thu, 30 Mar 2023 11:38:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231714AbjC3Lid (ORCPT ); Thu, 30 Mar 2023 07:38:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231577AbjC3Lia (ORCPT ); Thu, 30 Mar 2023 07:38:30 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EE319ECB for ; Thu, 30 Mar 2023 04:37:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680176230; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=P0DTv4gl8fMLayIUkvMe05PQQKcmNOxgRlRQJo/UHTk=; b=GaYWEunEOGJ96sKqVBNGqvUpBkA75E9iaUrnI7llwvx3iTO6kvVfexsNgXKj0AQX1kTrD6 0/szhv2h65XWYg3PnefDF3U1VK7bOKdb46R96HPa+WT4jhxgOvcyuBBHn1z2eqx4omQQ7q u22tCK8Lu4d4x8exX3+oeI66NmqEaEg= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-449-0F5Xh6MCNryUTMXNPDqzxw-1; Thu, 30 Mar 2023 07:37:06 -0400 X-MC-Unique: 0F5Xh6MCNryUTMXNPDqzxw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 4D6A21C0754C; Thu, 30 Mar 2023 11:37:06 +0000 (UTC) Received: from localhost (ovpn-8-19.pek2.redhat.com [10.72.8.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 55D9DC15BA0; Thu, 30 Mar 2023 11:37:04 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Miklos Szeredi , ZiyangZhang , Xiaoguang Wang , Bernd Schubert , Pavel Begunkov , Stefan Hajnoczi , Dan Williams , Ming Lei Subject: [PATCH V6 05/17] io_uring: support OP_READ/OP_WRITE for fused secondary request Date: Thu, 30 Mar 2023 19:36:18 +0800 Message-Id: <20230330113630.1388860-6-ming.lei@redhat.com> In-Reply-To: <20230330113630.1388860-1-ming.lei@redhat.com> References: <20230330113630.1388860-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Start to allow fused secondary request to support OP_READ/OP_WRITE, and the buffer can be retrieved from the primary request. Once the secondary request is completed, the primary request buffer will be returned back. Signed-off-by: Ming Lei --- io_uring/opdef.c | 4 ++++ io_uring/rw.c | 21 +++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/io_uring/opdef.c b/io_uring/opdef.c index 63b90e8e65f8..d81c9afd65ed 100644 --- a/io_uring/opdef.c +++ b/io_uring/opdef.c @@ -235,6 +235,8 @@ const struct io_issue_def io_issue_defs[] = { .ioprio = 1, .iopoll = 1, .iopoll_queue = 1, + .fused_secondary = 1, + .buf_dir = WRITE, .prep = io_prep_rw, .issue = io_read, }, @@ -248,6 +250,8 @@ const struct io_issue_def io_issue_defs[] = { .ioprio = 1, .iopoll = 1, .iopoll_queue = 1, + .fused_secondary = 1, + .buf_dir = READ, .prep = io_prep_rw, .issue = io_write, }, diff --git a/io_uring/rw.c b/io_uring/rw.c index 5431caf1e331..5ce7c8a2f74d 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -19,6 +19,7 @@ #include "kbuf.h" #include "rsrc.h" #include "rw.h" +#include "fused_cmd.h" struct io_rw { /* NOTE: kiocb has the file as the first member, so don't do it here */ @@ -371,6 +372,18 @@ static struct iovec *__io_import_iovec(int ddir, struct io_kiocb *req, size_t sqe_len; ssize_t ret; + /* + * fused_secondary OP passes buffer offset from sqe->addr actually, since + * the fused cmd buf's mapped start address is zero. + */ + if (io_req_use_fused_buf(req)) { + ret = io_import_buf_from_fused(rw->addr, rw->len, ddir, + iter, req); + if (ret) + return ERR_PTR(ret); + return NULL; + } + if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { ret = io_import_fixed(ddir, iter, req->imu, rw->addr, rw->len); if (ret) @@ -443,11 +456,19 @@ static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) */ static ssize_t loop_rw_iter(int ddir, struct io_rw *rw, struct iov_iter *iter) { + struct io_kiocb *req = cmd_to_io_kiocb(rw); struct kiocb *kiocb = &rw->kiocb; struct file *file = kiocb->ki_filp; ssize_t ret = 0; loff_t *ppos; + /* + * Fused secondary req hasn't user buffer, so ->read/->write can't + * be supported + */ + if (io_req_use_fused_buf(req)) + return -EOPNOTSUPP; + /* * Don't support polled IO through this interface, and we can't * support non-blocking either. For the latter, this just causes -- 2.39.2