From patchwork Thu Nov 17 00:17:18 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 9433139 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 299186021C for ; Wed, 16 Nov 2016 22:41:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1B5B428F01 for ; Wed, 16 Nov 2016 22:41:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1096629179; Wed, 16 Nov 2016 22:41:59 +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=-6.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM autolearn=unavailable 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 BCDDD28F01 for ; Wed, 16 Nov 2016 22:41:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1424357AbcKPWlO (ORCPT ); Wed, 16 Nov 2016 17:41:14 -0500 Received: from p3plsmtps2ded02.prod.phx3.secureserver.net ([208.109.80.59]:59528 "EHLO p3plsmtps2ded02.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941035AbcKPWfY (ORCPT ); Wed, 16 Nov 2016 17:35:24 -0500 Received: from linuxonhyperv.com ([72.167.245.219]) by : HOSTING RELAY : with SMTP id 78bfc1z9PO2Wo78bfc4Yjq; Wed, 16 Nov 2016 15:23:03 -0700 x-originating-ip: 72.167.245.219 Received: by linuxonhyperv.com (Postfix, from userid 528) id 1B1DF190298; Wed, 16 Nov 2016 16:18:00 -0800 (PST) From: Matthew Wilcox To: linux-kernel@vger.kernel.org, Andrew Morton , Konstantin Khlebnikov , Ross Zwisler Cc: linux-fsdevel@vger.kernel.org, Matthew Wilcox , linux-mm@kvack.org, "Kirill A . Shutemov" Subject: [PATCH 15/29] radix-tree: Create node_tag_set() Date: Wed, 16 Nov 2016 16:17:18 -0800 Message-Id: <1479341856-30320-54-git-send-email-mawilcox@linuxonhyperv.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1479341856-30320-1-git-send-email-mawilcox@linuxonhyperv.com> References: <1479341856-30320-1-git-send-email-mawilcox@linuxonhyperv.com> X-CMAE-Envelope: MS4wfC7gyTSeBxx+x4f2XL9XwexeU1IrJs4MMrfTSoDLLEB7MYdCsaqYWRCfdzZaGx67u9KAKrpDFT3rcTAG2kVFZJ5lRYc3N4sSyNC/CpSWb5PmkSJ4QHHq dmYPJqPM9lJh475rX7Ww8k5HcsQ7PlbZKHpzJn0CGefKRvoqfdMJysusIIFbD7Go3R1cllGS+wV2MK42gJkl0zh0o0PVMSXaJpwpYjzQO6W/02ucnqAJIFKw lnymGa0KQR5crmc8OplxRhqui7ZJ1aFPDxuNa0vAptuJ/htJLZpTykxtRyWp+C72ZG0O4dRV0w9szERz0dLOPnu3KzNpgb5zGk2klrQlf+j1TkmcQikCWKhD 4vrbz0CzwJv5aYtNXcqhFqfvwpDxqCGGvcd3IUqs2Vrp6ABUyozkC9r19DXfyKvUktI7xdU+i1hKtwGKHXrFccA2oxfo8/UbH+WDDfxwkVmy/+sQ/lg= Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox Similar to node_tag_clear(), factor node_tag_set() out of radix_tree_range_tag_if_tagged(). Signed-off-by: Matthew Wilcox --- lib/radix-tree.c | 41 +++++++++++++++++++---------------------- 1 file changed, 19 insertions(+), 22 deletions(-) diff --git a/lib/radix-tree.c b/lib/radix-tree.c index baf4ba1..bf1303f 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -1028,6 +1028,22 @@ static void node_tag_clear(struct radix_tree_root *root, root_tag_clear(root, tag); } +static void node_tag_set(struct radix_tree_root *root, + struct radix_tree_node *node, + unsigned int tag, unsigned int offset) +{ + while (node) { + if (tag_get(node, tag, offset)) + return; + tag_set(node, tag, offset); + offset = node->offset; + node = node->parent; + } + + if (!root_tag_get(root, tag)) + root_tag_set(root, tag); +} + /** * radix_tree_tag_clear - clear a tag on a radix tree node * @root: radix tree root @@ -1268,7 +1284,7 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root, unsigned long nr_to_tag, unsigned int iftag, unsigned int settag) { - struct radix_tree_node *parent, *node, *child; + struct radix_tree_node *node, *child; unsigned long maxindex; unsigned long tagged = 0; unsigned long index = *first_indexp; @@ -1303,22 +1319,8 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root, continue; } - /* tag the leaf */ tagged++; - tag_set(node, settag, offset); - - /* walk back up the path tagging interior nodes */ - parent = node; - for (;;) { - offset = parent->offset; - parent = parent->parent; - if (!parent) - break; - /* stop if we find a node with the tag already set */ - if (tag_get(parent, settag, offset)) - break; - tag_set(parent, settag, offset); - } + node_tag_set(root, node, settag, offset); next: /* Go to next entry in node */ index = ((index >> node->shift) + 1) << node->shift; @@ -1340,12 +1342,7 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root, if (tagged >= nr_to_tag) break; } - /* - * We need not to tag the root tag if there is no tag which is set with - * settag within the range from *first_indexp to last_index. - */ - if (tagged > 0) - root_tag_set(root, settag); + *first_indexp = index; return tagged;