From patchwork Thu Apr 8 14:04:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 418245 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=unavailable 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 63E8FC433ED for ; Thu, 8 Apr 2021 14:05:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24DC06102A for ; Thu, 8 Apr 2021 14:05:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231842AbhDHOFL (ORCPT ); Thu, 8 Apr 2021 10:05:11 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:37153 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231803AbhDHOFI (ORCPT ); Thu, 8 Apr 2021 10:05:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617890697; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gSWYbhIaJdMrpl7aiwuuHeD5yWsVtmcOiCOXzWCEKpk=; b=ZmXyKpUjhY330RUaMDpL+XJecCSnfbvA8OLocuTBe8IojoR2j7KRmEyRloW8rc/NuP6cVO 3bk28ImSoQkY5pG7F0irovGmyJFWatr3WzhMhOR/N0Ozq+J19PVIW8qGM0kgLbJRor3KJN QnK2Eh1ogZKBukNLocyWgwEE+g9wLAg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-496-Y6CR6-g9PnGwphTM_rO9Jg-1; Thu, 08 Apr 2021 10:04:54 -0400 X-MC-Unique: Y6CR6-g9PnGwphTM_rO9Jg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 12AEB801FCE; Thu, 8 Apr 2021 14:04:53 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-119-35.rdu2.redhat.com [10.10.119.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id F36525D747; Thu, 8 Apr 2021 14:04:46 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v6 04/30] fs: Document file_ra_state From: David Howells To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , David Wysochanski , "Matthew Wilcox (Oracle)" , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org Date: Thu, 08 Apr 2021 15:04:46 +0100 Message-ID: <161789068619.6155.1397999970593531574.stgit@warthog.procyon.org.uk> In-Reply-To: <161789062190.6155.12711584466338493050.stgit@warthog.procyon.org.uk> References: <161789062190.6155.12711584466338493050.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Matthew Wilcox (Oracle) Turn the comments into kernel-doc and improve the wording slightly. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: David Howells Link: https://lore.kernel.org/r/20210407201857.3582797-3-willy@infradead.org/ --- include/linux/fs.h | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index ec8f3ddf4a6a..33831a8bda52 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -891,18 +891,22 @@ struct fown_struct { int signum; /* posix.1b rt signal to be delivered on IO */ }; -/* - * Track a single file's readahead state +/** + * struct file_ra_state - Track a file's readahead state. + * @start: Where the most recent readahead started. + * @size: Number of pages read in the most recent readahead. + * @async_size: Start next readahead when this many pages are left. + * @ra_pages: Maximum size of a readahead request. + * @mmap_miss: How many mmap accesses missed in the page cache. + * @prev_pos: The last byte in the most recent read request. */ struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned int size; /* # of readahead pages */ - unsigned int async_size; /* do asynchronous readahead when - there are only # of pages ahead */ - - unsigned int ra_pages; /* Maximum readahead window */ - unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ - loff_t prev_pos; /* Cache last read() position */ + pgoff_t start; + unsigned int size; + unsigned int async_size; + unsigned int ra_pages; + unsigned int mmap_miss; + loff_t prev_pos; }; /*