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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 79D33C169C4 for ; Tue, 29 Jan 2019 19:27:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C2CC20989 for ; Tue, 29 Jan 2019 19:27:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="oo28UMh4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728962AbfA2T1J (ORCPT ); Tue, 29 Jan 2019 14:27:09 -0500 Received: from mail-it1-f194.google.com ([209.85.166.194]:50755 "EHLO mail-it1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728444AbfA2T1J (ORCPT ); Tue, 29 Jan 2019 14:27:09 -0500 Received: by mail-it1-f194.google.com with SMTP id z7so6447914iti.0 for ; Tue, 29 Jan 2019 11:27:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=FY7i8A/t+ar+CVDsIpMVwrTPPHLhDb6dZzvnPNdG5Kc=; b=oo28UMh4aY3+/hNDsX1I7V4eXLEngmqGOwr7uFwz1YJroefW/lcDshRjhZnJPJy1kY J4x9OLu3/wdxO/eDri2b5mgdNIzBJd58YAkzR7i7e/Sk1+mxnU/+eoD0Jkxr7jR1jCx1 elD6PjTK76AgcXmiGc9LloC4B6AKglfdtE5YK7GhCzzpVaRfYLCRuTqXIEmchFVIx2cH TY9T8z9/V99MsFdluji32y8nIOs9tdKjlYEx0XvbHfG/+8ZftaVmYCdeoWDW0vtvvvR8 80g68ka5YurEFZ2PZr+2Ok4QYrl8QJP30o2YpSS38Os8jEltZPKqDyrAXdGUUlcMiC9I SlxQ== 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; bh=FY7i8A/t+ar+CVDsIpMVwrTPPHLhDb6dZzvnPNdG5Kc=; b=JJ9Ck9hcWxrJg+V6fBrdC17GwbVidIoZXcnDR927Gs24NMeBhnYp56EHwLYKEd3yW3 NXmsTkLysyd5wPRvOjEHoXTdgUPZdR5UeHCcW5VBOstxeGgB6uCu7YnpkTzJzSkQ0F4I hBC/w5KbljUWizsNe15d/TrDFBVMV6Rl/2rp5d6nIq8Vxa6ODiHd3sUoJbeDa2o+UAAp 9Elffo8bF8P66Y2ciuBcVAQt5aUOyJK2oaXptLgFMisJthX15LnxctxzZq38WxalQLzJ aFPIMUwY4g+1PppumaaDqRJmryYLpnyN1f5v50e4dG3N5/NB9/tkIQTmZuh7QgN/mTHX cTeg== X-Gm-Message-State: AJcUukf2zv1frRR05FzdvUsdRmnFWoYtU+sMyvSd1AtUyA+7c2u1c19o o2JZFUr9OsOHBzGMwy6hwTSrCg== X-Google-Smtp-Source: ALg8bN7UXi5FwCNUaGvbXjEO7V/orLTEku1mGRlujGnUZAgee5RAzLFK4V3AO59v7DtlJ2TJBc0bMQ== X-Received: by 2002:a02:410e:: with SMTP id x14mr16057161jaa.36.1548790028504; Tue, 29 Jan 2019 11:27:08 -0800 (PST) Received: from localhost.localdomain ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id y3sm15223203iol.55.2019.01.29.11.27.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Jan 2019 11:27:07 -0800 (PST) From: Jens Axboe To: linux-aio@kvack.org, linux-block@vger.kernel.org, linux-api@vger.kernel.org Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com, jannh@google.com, Jens Axboe Subject: [PATCH 01/18] fs: add an iopoll method to struct file_operations Date: Tue, 29 Jan 2019 12:26:45 -0700 Message-Id: <20190129192702.3605-2-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190129192702.3605-1-axboe@kernel.dk> References: <20190129192702.3605-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Christoph Hellwig This new methods is used to explicitly poll for I/O completion for an iocb. It must be called for any iocb submitted asynchronously (that is with a non-null ki_complete) which has the IOCB_HIPRI flag set. The method is assisted by a new ki_cookie field in struct iocb to store the polling cookie. Reviewed-by: Johannes Thumshirn Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- Documentation/filesystems/vfs.txt | 3 +++ include/linux/fs.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 8dc8e9c2913f..761c6fd24a53 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -857,6 +857,7 @@ struct file_operations { ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); + int (*iopoll)(struct kiocb *kiocb, bool spin); int (*iterate) (struct file *, struct dir_context *); int (*iterate_shared) (struct file *, struct dir_context *); __poll_t (*poll) (struct file *, struct poll_table_struct *); @@ -902,6 +903,8 @@ otherwise noted. write_iter: possibly asynchronous write with iov_iter as source + iopoll: called when aio wants to poll for completions on HIPRI iocbs + iterate: called when the VFS needs to read the directory contents iterate_shared: called when the VFS needs to read the directory contents diff --git a/include/linux/fs.h b/include/linux/fs.h index 811c77743dad..ccb0b7a63aa5 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -310,6 +310,7 @@ struct kiocb { int ki_flags; u16 ki_hint; u16 ki_ioprio; /* See linux/ioprio.h */ + unsigned int ki_cookie; /* for ->iopoll */ } __randomize_layout; static inline bool is_sync_kiocb(struct kiocb *kiocb) @@ -1786,6 +1787,7 @@ struct file_operations { ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); + int (*iopoll)(struct kiocb *kiocb, bool spin); int (*iterate) (struct file *, struct dir_context *); int (*iterate_shared) (struct file *, struct dir_context *); __poll_t (*poll) (struct file *, struct poll_table_struct *); -- 2.17.1