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,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 762BEC43444 for ; Wed, 16 Jan 2019 17:50:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 496BC2082F for ; Wed, 16 Jan 2019 17:50:15 +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="JAjYdqRp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727651AbfAPRuO (ORCPT ); Wed, 16 Jan 2019 12:50:14 -0500 Received: from mail-io1-f66.google.com ([209.85.166.66]:35357 "EHLO mail-io1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727647AbfAPRuO (ORCPT ); Wed, 16 Jan 2019 12:50:14 -0500 Received: by mail-io1-f66.google.com with SMTP id f4so5607638ion.2 for ; Wed, 16 Jan 2019 09:50:13 -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=AAKxls5Es8ExKqpwMiUOBUcGduRQU3BNIbRWpRo7VtQ=; b=JAjYdqRpFCWSALrrMNGoaq4Q6g1wZltZ+wP7rIrj8GJnPvz1ZIH112d/Is7kTVeFZi rBg2KZFToJCKtuvT0w+zv+/8hBxNpZMDC19u6Bpy7VC/tg7ZLn8+RiXceBsucKMXKulz dVVFLn6XacmgRpRxcsH59uYTeRn0eK0x1b8cAwAvPGZDf3aVlF5enIZ45rUixTF5SXRn ly9VzimSKbCGr31OgNjW7asySBgszrwMO20EqSQZ5cWFq5ffZeKhnrjbYL9SxWzvDyMe I7igqcaPyHcwnohegEqV3ue5PQBBsK1vLEZgDy/mVD7NlpYJqEBtwsmCsaUnTtXYq6ii zALw== 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=AAKxls5Es8ExKqpwMiUOBUcGduRQU3BNIbRWpRo7VtQ=; b=jpkoWk5XwJu9lgL8MoVhr+eiXDnsu2xRssYMfhc1fHGPk0eq5s165bdLaDFyPD66FI IMV6Tsr+hUdkPYpMYI+X4Q5r0dzkcdQ0ykU77+rrMi4WMnZGrkWZCEQAJIfGLiMm8jIG KVQdng7rSjTUGFqKOfuFnVJXEQJ1R4Dlk2DmH0Ib2JNOWwiW8Mz/2s5ue4fstgtsDd/F gtI3Rglvin/NAzrwv28Ox/N/R+RLlOLwLGSietJc5VVOJa4X2llUhG5BxNEAX8Z9fWtN rfSJCihf/wyHHT5faL6i5hmkWAqBdeeEenbIDhY/cgVSWluE3THp6nTETxpHLakUZWpu mSZA== X-Gm-Message-State: AJcUukfDmIwh41QaHm8xJnJ96h7lxjpMJ0YYQ4vXOPefCoizy9W8vZXb HohUSfCITbeqhS64lo33hIe9jw== X-Google-Smtp-Source: ALg8bN7SaUv3pm0Mmji9ZYEsqX8JYxytaBbb+529Vo4M4SAlY1VFvslRQZa8Imy2FPYKoqNSjCKg4g== X-Received: by 2002:a6b:b502:: with SMTP id e2mr5114023iof.43.1547661013181; Wed, 16 Jan 2019 09:50:13 -0800 (PST) Received: from x1.localdomain ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id x128sm3705690itb.8.2019.01.16.09.50.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 16 Jan 2019 09:50:12 -0800 (PST) From: Jens Axboe To: linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, linux-block@vger.kernel.org, linux-arch@vger.kernel.org Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com, Jens Axboe Subject: [PATCH 01/15] fs: add an iopoll method to struct file_operations Date: Wed, 16 Jan 2019 10:49:49 -0700 Message-Id: <20190116175003.17880-2-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190116175003.17880-1-axboe@kernel.dk> References: <20190116175003.17880-1-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. TODO: we can probably union ki_cookie with the existing hint and I/O priority fields to avoid struct kiocb growth. 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