From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 15AAEC43331 for ; Thu, 26 Mar 2020 08:34:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E8E8520772 for ; Thu, 26 Mar 2020 08:34:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727849AbgCZIeM (ORCPT ); Thu, 26 Mar 2020 04:34:12 -0400 Received: from mx2.suse.de ([195.135.220.15]:49712 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727843AbgCZIeL (ORCPT ); Thu, 26 Mar 2020 04:34:11 -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 5BEA7AFD8 for ; Thu, 26 Mar 2020 08:34:10 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH v2 24/39] btrfs: Rename remove_backref_node() to btrfs_backref_cleanup_node() and move it to backref.c Date: Thu, 26 Mar 2020 16:33:01 +0800 Message-Id: <20200326083316.48847-25-wqu@suse.com> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200326083316.48847-1-wqu@suse.com> References: <20200326083316.48847-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 | 53 ++++--------------------------------------- 3 files changed, 52 insertions(+), 48 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 9475b6ccc7eb..5cab1b71d0b5 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -2511,3 +2511,41 @@ 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 5e8d368d9a82..5bc3700fea1d 100644 --- a/fs/btrfs/backref.h +++ b/fs/btrfs/backref.h @@ -353,4 +353,13 @@ 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 fd94bd18f2ad..04d9b88d92aa 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -153,9 +153,6 @@ 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) { @@ -186,13 +183,13 @@ 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; @@ -268,46 +265,6 @@ 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) @@ -345,7 +302,7 @@ 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)) { @@ -1120,7 +1077,7 @@ struct btrfs_backref_node *build_backref_tree(struct reloc_control *rc, btrfs_backref_free_node(cache, lower); } - remove_backref_node(cache, node); + btrfs_backref_cleanup_node(cache, node); ASSERT(list_empty(&cache->useless_node) && list_empty(&cache->pending_edge)); return ERR_PTR(err); @@ -3088,7 +3045,7 @@ 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; } -- 2.26.0