From patchwork Sun Apr 30 09:35:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 13227173 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 A3F4DC7EE21 for ; Sun, 30 Apr 2023 09:37:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229655AbjD3Jhp (ORCPT ); Sun, 30 Apr 2023 05:37:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230163AbjD3Jhm (ORCPT ); Sun, 30 Apr 2023 05:37:42 -0400 Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8DD4A2693 for ; Sun, 30 Apr 2023 02:37:41 -0700 (PDT) Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-3f173af665fso7655995e9.3 for ; Sun, 30 Apr 2023 02:37:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682847460; x=1685439460; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=/I+SXBlP5m5skW9dAnqAKLCKy57FKwiqD1z+msHPm2g=; b=PMbAC/g+BiMHyF893heaIHe7yxcmuLzyesy22WmK857xvQThW7+Zl7MGtGWcCWbgjo VnbMpvOKDf8V6WGOfL0Ed2qnL/xE352VGxFClU09gNDJ7LmDNhm/7B9setToYLjovq3R gUgIPO3JO3JOxheCgVnvH4PLhIzb64v7uenLqxZ77xiZ3zHhXFWddZo9NFAaGvVCY6ie eKJBxSPDU5MEBkXG/LqzkaZHAAdNh3iKi+I2A0+ubf9hKmYEZOqKgS4EfcX5BJHkQ6oF atnGhRtjlbV/zoSr+rSA6xnTfroyYOgd/cWUppbSK9EhoFQ868/Z5pj+E1jmohkjqlYt 9jug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682847460; x=1685439460; 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:message-id:reply-to; bh=/I+SXBlP5m5skW9dAnqAKLCKy57FKwiqD1z+msHPm2g=; b=SgIh0u0VedMuV9G4QlUWFfiOH3WDEha4zy3hU6rwVOHyYTD1l9Q1NHLDr5pe1ULKd4 uc/zXI7HHC9Jq7bdCcii8I0U3Oyz1BpH2N/fpWa1ToOWKXDl4EQ/hl1r8v049Lv/Xqct AAYWeIpuAdwMcczz17fOuc+IGC3unycakyxxP2955FyOFU2kYDIdNADxPlaU2o0RIopd kSKCOg44Koy/yua6wMPJ2fnqJtozNwHNRwkzfJzQRQ/jznhMbgo0YnzuoOEyO0KC3Aw/ TNS4txN5PajwLSvlb3/bGa3mHYxvLQ2CXAysqItD8tuvpi7pml+QTRZ4YimhjaXo0XIU hvfg== X-Gm-Message-State: AC+VfDxWzzEQtL7Rona0plfGMhlYKWG25jIAzsryYg/bG3UPRIWlC0PM pawPOvp00QzAoR98shWmxQFNEnOKEdY= X-Google-Smtp-Source: ACHHUZ4fs7cxek3ysOf9I8NDt0Gh1fnihK6DstK4skxwa2H//clRrDp6/QffkCCn9q965n7sLTxxJg== X-Received: by 2002:a7b:c5d9:0:b0:3ed:b048:73f4 with SMTP id n25-20020a7bc5d9000000b003edb04873f4mr7553794wmk.5.1682847459670; Sun, 30 Apr 2023 02:37:39 -0700 (PDT) Received: from 127.0.0.1localhost (188.31.116.198.threembb.co.uk. [188.31.116.198]) by smtp.gmail.com with ESMTPSA id u19-20020a05600c00d300b003f17eaae2c9sm29473170wmm.1.2023.04.30.02.37.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 Apr 2023 02:37:39 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: asml.silence@gmail.com, ming.lei@redhat.com Subject: [RFC 6/7] io_uring/rsrc: introduce helper installing one buffer Date: Sun, 30 Apr 2023 10:35:28 +0100 Message-Id: X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add a new helper called io_install_buffer(), which will be used later for operations willing to install buffers into the registered buffer table. Signed-off-by: Pavel Begunkov --- io_uring/rsrc.c | 15 +++++++++++++++ io_uring/rsrc.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 3799470fd45e..db4286b42dce 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -517,6 +517,21 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, return done ? done : err; } +int io_install_buffer(struct io_ring_ctx *ctx, + struct io_mapped_ubuf *imu, + unsigned i) +{ + if (unlikely(i >= ctx->nr_user_bufs)) + return -EFAULT; + + i = array_index_nospec(i, ctx->nr_user_bufs); + if (unlikely(ctx->user_bufs[i] != ctx->dummy_ubuf)) + return -EINVAL; + + ctx->user_bufs[i] = imu; + return 0; +} + static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, struct io_uring_rsrc_update2 *up, unsigned nr_args) diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 29ce9a8a2277..aba95bdd060e 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -75,6 +75,9 @@ void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, unsigned int nr_args, u64 __user *tags); +int io_install_buffer(struct io_ring_ctx *ctx, struct io_mapped_ubuf *imu, + unsigned i); + void __io_sqe_files_unregister(struct io_ring_ctx *ctx); int io_sqe_files_unregister(struct io_ring_ctx *ctx); int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,