From patchwork Mon Mar 23 10:24:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 11452677 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BCD51159A for ; Mon, 23 Mar 2020 10:25:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A5F722074D for ; Mon, 23 Mar 2020 10:25:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727981AbgCWKZk (ORCPT ); Mon, 23 Mar 2020 06:25:40 -0400 Received: from mx2.suse.de ([195.135.220.15]:38516 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727948AbgCWKZj (ORCPT ); Mon, 23 Mar 2020 06:25:39 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 7F7F2B22C for ; Mon, 23 Mar 2020 10:25:37 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH 24/40] btrfs: Rename remove_backref_node() to btrfs_backref_cleanup_node() and move it to backref.c Date: Mon, 23 Mar 2020 18:24:00 +0800 Message-Id: <20200323102416.112862-25-wqu@suse.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200323102416.112862-1-wqu@suse.com> References: <20200323102416.112862-1-wqu@suse.com> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Also add comment explaining the cleanup progress, to differ it from btrfs_backref_drop_node(). Signed-off-by: Qu Wenruo --- fs/btrfs/backref.c | 38 ++++++++++++++++++++++++++++++++ fs/btrfs/backref.h | 9 ++++++++ fs/btrfs/relocation.c | 51 ++++--------------------------------------- 3 files changed, 51 insertions(+), 47 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 2bf3bf2d7b85..0c8950750682 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -2515,3 +2515,41 @@ struct btrfs_backref_edge *btrfs_backref_alloc_edge( cache->nr_edges++; return edge; } + +void btrfs_backref_cleanup_node(struct btrfs_backref_cache *cache, + struct btrfs_backref_node *node) +{ + struct btrfs_backref_node *upper; + struct btrfs_backref_edge *edge; + + if (!node) + return; + + BUG_ON(!node->lowest && !node->detached); + while (!list_empty(&node->upper)) { + edge = list_entry(node->upper.next, struct btrfs_backref_edge, + list[LOWER]); + upper = edge->node[UPPER]; + list_del(&edge->list[LOWER]); + list_del(&edge->list[UPPER]); + btrfs_backref_free_edge(cache, edge); + + if (RB_EMPTY_NODE(&upper->rb_node)) { + BUG_ON(!list_empty(&node->upper)); + btrfs_backref_drop_node(cache, node); + node = upper; + node->lowest = 1; + continue; + } + /* + * add the node to leaf node list if no other + * child block cached. + */ + if (list_empty(&upper->lower)) { + list_add_tail(&upper->lower, &cache->leaves); + upper->lowest = 1; + } + } + + btrfs_backref_drop_node(cache, node); +} diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h index a6d568449c88..068a28c8e37b 100644 --- a/fs/btrfs/backref.h +++ b/fs/btrfs/backref.h @@ -349,4 +349,13 @@ static inline void btrfs_backref_drop_node(struct btrfs_backref_cache *tree, btrfs_backref_free_node(tree, node); } +/* + * Drop the backref node from cache, also cleaning up all its + * upper edges and any uncached nodes in the path. + * + * This cleanup happens bottom up, thus the node should either + * be the lowest node in the cache or detached node. + */ +void btrfs_backref_cleanup_node(struct btrfs_backref_cache *cache, + struct btrfs_backref_node *node); #endif diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 47649ff1052f..4c687318f70b 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -160,9 +160,6 @@ struct reloc_control { #define MOVE_DATA_EXTENTS 0 #define UPDATE_DATA_PTRS 1 -static void remove_backref_node(struct btrfs_backref_cache *cache, - struct btrfs_backref_node *node); - static void mark_block_processed(struct reloc_control *rc, struct btrfs_backref_node *node) { @@ -193,13 +190,13 @@ static void backref_cache_cleanup(struct btrfs_backref_cache *cache) while (!list_empty(&cache->detached)) { node = list_entry(cache->detached.next, struct btrfs_backref_node, list); - remove_backref_node(cache, node); + btrfs_backref_cleanup_node(cache, node); } while (!list_empty(&cache->leaves)) { node = list_entry(cache->leaves.next, struct btrfs_backref_node, lower); - remove_backref_node(cache, node); + btrfs_backref_cleanup_node(cache, node); } cache->last_trans = 0; @@ -275,46 +272,6 @@ static struct btrfs_backref_node *walk_down_backref( *index = 0; return NULL; } -/* - * remove a backref node from the backref cache - */ -static void remove_backref_node(struct btrfs_backref_cache *cache, - struct btrfs_backref_node *node) -{ - struct btrfs_backref_node *upper; - struct btrfs_backref_edge *edge; - - if (!node) - return; - - BUG_ON(!node->lowest && !node->detached); - while (!list_empty(&node->upper)) { - edge = list_entry(node->upper.next, struct btrfs_backref_edge, - list[LOWER]); - upper = edge->node[UPPER]; - list_del(&edge->list[LOWER]); - list_del(&edge->list[UPPER]); - btrfs_backref_free_edge(cache, edge); - - if (RB_EMPTY_NODE(&upper->rb_node)) { - BUG_ON(!list_empty(&node->upper)); - btrfs_backref_drop_node(cache, node); - node = upper; - node->lowest = 1; - continue; - } - /* - * add the node to leaf node list if no other - * child block cached. - */ - if (list_empty(&upper->lower)) { - list_add_tail(&upper->lower, &cache->leaves); - upper->lowest = 1; - } - } - - btrfs_backref_drop_node(cache, node); -} static void update_backref_node(struct btrfs_backref_cache *cache, struct btrfs_backref_node *node, u64 bytenr) @@ -352,7 +309,7 @@ static int update_backref_cache(struct btrfs_trans_handle *trans, while (!list_empty(&cache->detached)) { node = list_entry(cache->detached.next, struct btrfs_backref_node, list); - remove_backref_node(cache, node); + btrfs_backref_cleanup_node(cache, node); } while (!list_empty(&cache->changed)) { @@ -3038,7 +2995,7 @@ static int relocate_tree_block(struct btrfs_trans_handle *trans, } out: if (ret || node->level == 0 || node->cowonly) - remove_backref_node(&rc->backref_cache, node); + btrfs_backref_cleanup_node(&rc->backref_cache, node); return ret; }