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 C9002C433F5 for ; Mon, 9 May 2022 15:51:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238651AbiEIPyz (ORCPT ); Mon, 9 May 2022 11:54:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238643AbiEIPyz (ORCPT ); Mon, 9 May 2022 11:54:55 -0400 Received: from mail-il1-x12e.google.com (mail-il1-x12e.google.com [IPv6:2607:f8b0:4864:20::12e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30F274507B for ; Mon, 9 May 2022 08:50:59 -0700 (PDT) Received: by mail-il1-x12e.google.com with SMTP id n6so7678745ili.7 for ; Mon, 09 May 2022 08:50:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=XgEoW4oMmVhh6sQOitGdyc460zF0pM4QEeVw/SsJmZM=; b=Y0ywXcXs7DQU0XbZQH9uhoWjqvd8Wb5g8B9xxxqWget+rW3tr8Lny3E4b28HCg2xnu ivNT/XsLJqU1JMHZ1NS/hOAnMtozj5/tFFsg191lnJB71WbtTsIeL2fdSmZQVjL5Tg8W f6I25d19Yx9sZbE4Ge5chFHksc+NPyGuLdWVcBuBnNNfg2/pDcwxx0Bk8w5ZRcR6w5gc EXkTecv4UGnRQ799Q5Hh6yR2oi7uRfhqyv5+x4LL2JyWxidnzLW5QSmkj9r7RLpAE97y 0DzSRgdsCwLL93GEzZlWb5kIVAuZ20oS6LEBQg5gCMQDn41l/HIvXz0lU2tcO3oTVTwF APDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=XgEoW4oMmVhh6sQOitGdyc460zF0pM4QEeVw/SsJmZM=; b=EHwgHdqRao7TKShuP3zIRSDaFtMSFAyWzn1j7zJDz9T/vdUfHdNoPle8/flFTuNMfJ 4jQS4trhEYjt727pVZE4+aWH66HWk1kx4lcalicpibVzhg0vvrpkdL2VH2DbZjiVl2+k 3CR9GtXaOMBpEEbIiuI5VDezgMsTsC3X54qq30aFEwAaXhcIxpFjc81fuC+wZyk0hgdu 3JCEwqrSGKa1tiypewsLENIO7WP2/splwy+D3e+4Hb3kyaRVMdHMvngAYwyKLRB3R/+9 9yFs9T0saeNet/Er/WOd65NgYFBAqZFdBtE5V6pgzSbeUIJGxtZtUgOR4JsrLYiLyp0u YAVw== X-Gm-Message-State: AOAM532jNIC5RqBzASCQjQQGbED9IRsSUf5MYQiZLAORh4yfK5m1e6Rk NiXd9hFT65QvJEFj9BCMFE5EWU9HW9PN8Q== X-Google-Smtp-Source: ABdhPJxSxsBwWK6NPh8vUC/kaqMVU22nMKX2ZitwPmHsGAS+paRSnPjST8nElRbNL3mJpxHabTz6lg== X-Received: by 2002:a05:6e02:180d:b0:2cf:8481:4aa9 with SMTP id a13-20020a056e02180d00b002cf84814aa9mr6280407ilv.96.1652111458143; Mon, 09 May 2022 08:50:58 -0700 (PDT) Received: from m1.localdomain ([207.135.234.126]) by smtp.gmail.com with ESMTPSA id a1-20020a056638004100b0032b3a78177esm3696499jap.66.2022.05.09.08.50.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 May 2022 08:50:57 -0700 (PDT) From: Jens Axboe To: io-uring@vger.kernel.org Cc: asml.silence@gmail.com, haoxu.linux@gmail.com Subject: [PATCHSET v2 0/6] Allow allocated direct descriptors Date: Mon, 9 May 2022 09:50:49 -0600 Message-Id: <20220509155055.72735-1-axboe@kernel.dk> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hi, Currently using direct descriptors with open or accept requires the application to manage the descriptor space, picking which slot to use for any given file. However, there are cases where it's useful to just get a direct descriptor and not care about which value it is, instead just return it like a normal open or accept would. This will also be useful for multishot accept support, where allocated direct descriptors are a requirement to make that feature work with these kinds of files. This adds support for allocating a new fixed descriptor. This is chosen by passing in IORING_FILE_INDEX_ALLOC as the fixed slot, which is beyond any valid value for the file_index. Can also be found here: https://git.kernel.dk/cgit/linux-block/log/?h=for-5.19/io_uring-fixed-alloc fs/io_uring.c | 113 +++++++++++++++++++++++++++++++--- include/uapi/linux/io_uring.h | 17 ++++- 2 files changed, 120 insertions(+), 10 deletions(-) v2: - Fix unnecessary clear (Hao) - Add define for allocating a descriptor rather than use UINT_MAX. - Add patch bumping max file table size to 1M (from 32K) - Add ability to register a sparse file table upfront rather then have the application pass in a big array of -1. -- Jens Axboe