From patchwork Thu Jun 17 08:24:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 462249 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=-15.9 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 88A18C2B9F4 for ; Thu, 17 Jun 2021 08:24:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 71885613FB for ; Thu, 17 Jun 2021 08:24:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230503AbhFQI0s (ORCPT ); Thu, 17 Jun 2021 04:26:48 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:51055 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230463AbhFQI0s (ORCPT ); Thu, 17 Jun 2021 04:26:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623918280; 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=oBoiLG20PHadkXP0nta7KsZBfAwpclCVLrQiu4UaB3Y=; b=VgDnuW0IasaEvgqISitDeIFzakYoRo8XqYkpRfw+Q93pTnRA1UfczcFn4+3B9c9RxRhrsZ lKTTYV9SeQ7zidZERJiNJ77k4fJbtmpgCRp/qIUpybUS4gQwMk1SRO1BJN6HRljmF4uL6m SelCectbWa9WuJ8FRFVIVaRx5yw+5vU= 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-345-CoHpN6cVNNeyz26sBwuBHw-1; Thu, 17 Jun 2021 04:24:34 -0400 X-MC-Unique: CoHpN6cVNNeyz26sBwuBHw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7661C803621; Thu, 17 Jun 2021 08:24:33 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-118-65.rdu2.redhat.com [10.10.118.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 697381007623; Thu, 17 Jun 2021 08:24:28 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v2 3/3] netfs: fix test for whether we can skip read when writing beyond EOF From: David Howells To: linux-cachefs@redhat.com, linux-afs@lists.infradead.org Cc: Andrew W Elble , Jeff Layton , ceph-devel@vger.kernel.org, dhowells@redhat.com, Jeff Layton , "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 17 Jun 2021 09:24:27 +0100 Message-ID: <162391826758.1173366.11794946719301590013.stgit@warthog.procyon.org.uk> In-Reply-To: <162391823192.1173366.9740514875196345746.stgit@warthog.procyon.org.uk> References: <162391823192.1173366.9740514875196345746.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Jeff Layton It's not sufficient to skip reading when the pos is beyond the EOF. There may be data at the head of the page that we need to fill in before the write. Add a new helper function that corrects and clarifies the logic of when we can skip reads, and have it only zero out the part of the page that won't have data copied in for the write. Finally, don't set the page Uptodate after zeroing. It's not up to date since the write data won't have been copied in yet. [DH made the following changes: - Prefixed the new function with "netfs_". - Don't call zero_user_segments() for a full-page write. - Altered the beyond-last-page check to avoid a DIV instruction and got rid of then-redundant zero-length file check. ] Fixes: e1b1240c1ff5f ("netfs: Add write_begin helper") Reported-by: Andrew W Elble Signed-off-by: Jeff Layton Signed-off-by: David Howells cc: ceph-devel@vger.kernel.org Link: https://lore.kernel.org/r/20210613233345.113565-1-jlayton@kernel.org/ Link: https://lore.kernel.org/r/162367683365.460125.4467036947364047314.stgit@warthog.procyon.org.uk/ # v1 Reviewed-by: Matthew Wilcox (Oracle) --- fs/netfs/read_helper.c | 49 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 36 insertions(+), 13 deletions(-) diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c index 725614625ed4..0b6cd3b8734c 100644 --- a/fs/netfs/read_helper.c +++ b/fs/netfs/read_helper.c @@ -1011,12 +1011,42 @@ int netfs_readpage(struct file *file, } EXPORT_SYMBOL(netfs_readpage); -static void netfs_clear_thp(struct page *page) +/** + * netfs_skip_page_read - prep a page for writing without reading first + * @page: page being prepared + * @pos: starting position for the write + * @len: length of write + * + * In some cases, write_begin doesn't need to read at all: + * - full page write + * - write that lies in a page that is completely beyond EOF + * - write that covers the the page from start to EOF or beyond it + * + * If any of these criteria are met, then zero out the unwritten parts + * of the page and return true. Otherwise, return false. + */ +static bool netfs_skip_page_read(struct page *page, loff_t pos, size_t len) { - unsigned int i; + struct inode *inode = page->mapping->host; + loff_t i_size = i_size_read(inode); + size_t offset = offset_in_thp(page, pos); + + /* Full page write */ + if (offset == 0 && len >= thp_size(page)) + return true; + + /* pos beyond last page in the file */ + if (pos - offset >= i_size) + goto zero_out; + + /* Write that covers from the start of the page to EOF or beyond */ + if (offset == 0 && (pos + len) >= i_size) + goto zero_out; - for (i = 0; i < thp_nr_pages(page); i++) - clear_highpage(page + i); + return false; +zero_out: + zero_user_segments(page, 0, offset, offset + len, thp_size(page)); + return true; } /** @@ -1024,7 +1054,7 @@ static void netfs_clear_thp(struct page *page) * @file: The file to read from * @mapping: The mapping to read from * @pos: File position at which the write will begin - * @len: The length of the write in this page + * @len: The length of the write (may extend beyond the end of the page chosen) * @flags: AOP_* flags * @_page: Where to put the resultant page * @_fsdata: Place for the netfs to store a cookie @@ -1061,8 +1091,6 @@ int netfs_write_begin(struct file *file, struct address_space *mapping, struct inode *inode = file_inode(file); unsigned int debug_index = 0; pgoff_t index = pos >> PAGE_SHIFT; - int pos_in_page = pos & ~PAGE_MASK; - loff_t size; int ret; DEFINE_READAHEAD(ractl, file, NULL, mapping, index); @@ -1090,13 +1118,8 @@ int netfs_write_begin(struct file *file, struct address_space *mapping, * within the cache granule containing the EOF, in which case we need * to preload the granule. */ - size = i_size_read(inode); if (!ops->is_cache_enabled(inode) && - ((pos_in_page == 0 && len == thp_size(page)) || - (pos >= size) || - (pos_in_page == 0 && (pos + len) >= size))) { - netfs_clear_thp(page); - SetPageUptodate(page); + netfs_skip_page_read(page, pos, len)) { netfs_stat(&netfs_n_rh_write_zskip); goto have_page_no_wait; }