Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422717AbcKPWYp (ORCPT ); Wed, 16 Nov 2016 17:24:45 -0500 Received: from p3plsmtps2ded01.prod.phx3.secureserver.net ([208.109.80.58]:48276 "EHLO p3plsmtps2ded01.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S938977AbcKPWYM (ORCPT ); Wed, 16 Nov 2016 17:24:12 -0500 x-originating-ip: 72.167.245.219 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 16:16:42 -0800 Message-Id: <1479341856-30320-18-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: MS4wfBGzj7szfEWrsrJyWSPt3WE0BzMWXUn9UQzCodZilZ8Rqwo3A8lJel5uM5XSE+QF+RnEYMjC91y5cARd/Pvu+0f7skwUQkdT6m099GclRZu0MXI9HY6w /vzWehVI9cO3T9fTLqLX8ybvMuy5INroc7OBBmK4+bI0xAqPQUJzKsrNYdB03lV1a7HjA1b4t4sEU8hv50QYdj9L7a721jp4l2aBYFeuKMGv2BH4iDVSJodc AFBZAydNNi3ofT8kJSp5uEamX0C+gpoSI2SkfVq1EO6aGzfw0dEao08GK3mDCondKbD0UCXKYFhPzqWn7SgS3eJW1ofKiImq73FSr8wPvJOXcBl3mistPYrc hS6i8Ywo3Lx+QBmi9V33aSwggtymUqvRpVKyjjgPhEYWgqQnDA12TzKNjd80Fo3HCK6vmmrNj8Xuvwc99ziWa3QN5a8+Z8GbtqQB9Kk3fevvQOcjLC4= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2409 Lines: 86 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; -- 2.10.2