From patchwork Thu Feb 7 19:55:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 10802073 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C645D6C2 for ; Thu, 7 Feb 2019 19:56:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B629D2E259 for ; Thu, 7 Feb 2019 19:56:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AA4172E2A2; Thu, 7 Feb 2019 19:56:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 359682E25F for ; Thu, 7 Feb 2019 19:56:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727264AbfBGT4B (ORCPT ); Thu, 7 Feb 2019 14:56:01 -0500 Received: from mail-it1-f195.google.com ([209.85.166.195]:35962 "EHLO mail-it1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727122AbfBGT4B (ORCPT ); Thu, 7 Feb 2019 14:56:01 -0500 Received: by mail-it1-f195.google.com with SMTP id c9so2967336itj.1 for ; Thu, 07 Feb 2019 11:56:00 -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=pB0024BHqxQbFqcC6bm8p7+6qjmI2rEZP9GcpS5QfRU=; b=SdLVDThfQNGGBvSdx2ieObxXUNxV541kXy7C0CKM0Rn+mwquJwHo+7gPZhNqgdgfhz mMjsRgcrqrMGitpc7N0Yt/Pcc4l2jtxQwdsW85Q+xcilRZJjip9LEpVO8b3hg+rhaMWp oLZmNfLIhl9FYvzAFjmFBT4cq4qmNacpd3uLzdeNzOAou6pTnrLT47Y9xC3UK/yMvudJ u8VZERigj5XAUy1wutp9LoBeoMuyZo3jzSdG+QTITcqbRi3xhQ0B5CIl7omlucUuAys7 JiwiUWfR71TYjLFm1uKYjOxQSQfkYWOyqpsTtZC7IUxQJuAlRxEXkRinetKcu8d5bkwr huAg== 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=pB0024BHqxQbFqcC6bm8p7+6qjmI2rEZP9GcpS5QfRU=; b=B/L+yPe2CPw8hYqL94dMLRFo4tCpO9I8i4eoQmhxN2RPIs8DHRwgV6ybs5H8gu7lLA KGdv8B6NrPWD6PNgdhmVHVhbxbzgG2MCGdDAeoDLqIzMCYyLyPTu0B5Fgjd5iuIVQr/r KL7fcSj4scCmE1AIo2tdoeGGWbUekhNyccHOd94fZa3cMfBBDzNxUIaObmUY2A4bNI4d G1qH5liz+FO5sjDJ9dZDNBgMOKHmJqtD2jP4LUKmKrIK3+tSrsxkVDnr7507yeA56Zbm fDEzBPRBVJdfEFEY/SuZ98liidmd+mHNBMohM6lAbgUh2QeeyRWj18gYiIpelzQtNtlg B8iQ== X-Gm-Message-State: AHQUAubFmqtWtztLq1E9Ap+PM0zLqq7vNy/SAmpOWrW2Rq5+r5pJa9aI B1V3x+bgihe7SpesPARUBlqCWA== X-Google-Smtp-Source: AHgI3IZZSQU6u2qINr0s2sauHZQdvYQMMdS3/lnt0YCN4YBBAZgcgcRWg9XPNRgw8QA8qOeovGxfFw== X-Received: by 2002:a24:68d0:: with SMTP id v199mr1628018itb.73.1549569360177; Thu, 07 Feb 2019 11:56:00 -0800 (PST) Received: from localhost.localdomain ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id y26sm5092782iob.16.2019.02.07.11.55.58 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 Feb 2019 11:55:59 -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, viro@ZenIV.linux.org.uk, Jens Axboe Subject: [PATCH 01/18] fs: add an iopoll method to struct file_operations Date: Thu, 7 Feb 2019 12:55:35 -0700 Message-Id: <20190207195552.22770-2-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190207195552.22770-1-axboe@kernel.dk> References: <20190207195552.22770-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 29d8e2cfed0e..dedcc2e9265c 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) @@ -1787,6 +1788,7 @@ 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 *);