From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([59.151.112.132]:45782 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753275AbbL2IC1 (ORCPT ); Tue, 29 Dec 2015 03:02:27 -0500 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 0618A409257A for ; Tue, 29 Dec 2015 16:01:27 +0800 (CST) From: Qu Wenruo To: CC: Wang Xiaoguang Subject: [PATCH 04/14] btrfs: dedup: Introduce function to remove hash from in-memory tree Date: Tue, 29 Dec 2015 16:01:13 +0800 Message-ID: <1451376083-30474-5-git-send-email-quwenruo@cn.fujitsu.com> In-Reply-To: <1451376083-30474-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1451376083-30474-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Wang Xiaoguang Introduce static function inmem_del() to remove hash from in-memory dedup tree. And implement btrfs_dedup_del() and btrfs_dedup_destroy() interfaces. Signed-off-by: Qu Wenruo Signed-off-by: Wang Xiaoguang --- fs/btrfs/dedup.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) diff --git a/fs/btrfs/dedup.c b/fs/btrfs/dedup.c index cafbce1..658c493 100644 --- a/fs/btrfs/dedup.c +++ b/fs/btrfs/dedup.c @@ -210,3 +210,80 @@ int btrfs_dedup_add(struct btrfs_trans_handle *trans, struct btrfs_root *root, return inmem_add(dedup_info, hash); return -EINVAL; } + +static struct btrfs_dedup_hash * +inmem_search_bytenr(struct btrfs_dedup_info *dedup_info, u64 bytenr) +{ + struct rb_node **p = &dedup_info->bytenr_root.rb_node; + struct rb_node *parent = NULL; + struct btrfs_dedup_hash *entry = NULL; + + while (*p) { + parent = *p; + entry = rb_entry(parent, struct btrfs_dedup_hash, bytenr_node); + + if (bytenr < entry->bytenr) + p = &(*p)->rb_left; + else if (bytenr > entry->bytenr) + p = &(*p)->rb_right; + else + return entry; + } + + return NULL; +} + +/* Delete a hash from in-memory dedup tree */ +static int inmem_del(struct btrfs_dedup_info *dedup_info, u64 bytenr) +{ + struct btrfs_dedup_hash *hash; + + spin_lock(&dedup_info->lock); + hash = inmem_search_bytenr(dedup_info, bytenr); + if (!hash) { + spin_unlock(&dedup_info->lock); + return 0; + } + + __inmem_del(dedup_info, hash); + spin_unlock(&dedup_info->lock); + return 0; +} + +/* Remove a dedup hash from dedup tree */ +int btrfs_dedup_del(struct btrfs_trans_handle *trans, struct btrfs_root *root, + u64 bytenr) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_dedup_info *dedup_info = fs_info->dedup_info; + + if (!dedup_info) + return 0; + + if (dedup_info->backend == BTRFS_DEDUP_BACKEND_INMEMORY) + return inmem_del(dedup_info, bytenr); + return -EINVAL; +} + +static void inmem_destroy(struct btrfs_fs_info *fs_info) +{ + struct btrfs_dedup_hash *entry, *tmp; + struct btrfs_dedup_info *dedup_info = fs_info->dedup_info; + + spin_lock(&dedup_info->lock); + list_for_each_entry_safe(entry, tmp, &dedup_info->lru_list, lru_list) + __inmem_del(dedup_info, entry); + spin_unlock(&dedup_info->lock); +} + +int btrfs_dedup_disable(struct btrfs_fs_info *fs_info) +{ + struct btrfs_dedup_info *dedup_info = fs_info->dedup_info; + + if (!dedup_info) + return 0; + + if (dedup_info->backend == BTRFS_DEDUP_BACKEND_INMEMORY) + inmem_destroy(fs_info); + return 0; +} -- 2.6.4