From patchwork Tue Feb 2 03:05:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 8186351 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A1C8EBEEE5 for ; Tue, 2 Feb 2016 03:08:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C8DD620254 for ; Tue, 2 Feb 2016 03:08:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB53020218 for ; Tue, 2 Feb 2016 03:08:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752516AbcBBDI1 (ORCPT ); Mon, 1 Feb 2016 22:08:27 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:65010 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752349AbcBBDIH (ORCPT ); Mon, 1 Feb 2016 22:08:07 -0500 X-IronPort-AV: E=Sophos;i="5.20,367,1444665600"; d="scan'208";a="310385" Received: from unknown (HELO cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 02 Feb 2016 11:07:56 +0800 Received: from localhost.localdomain (unknown [10.167.226.34]) by cn.fujitsu.com (Postfix) with ESMTP id 8C38D4056413; Tue, 2 Feb 2016 11:07:51 +0800 (CST) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Wang Xiaoguang Subject: [PATCH v5 04/19] btrfs: dedup: Introduce function to remove hash from in-memory tree Date: Tue, 2 Feb 2016 11:05:36 +0800 Message-Id: <1454382351-31775-5-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1454382351-31775-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1454382351-31775-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 8C38D4056413.AB76E X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: quwenruo@cn.fujitsu.com X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/fs/btrfs/dedup.c b/fs/btrfs/dedup.c index b6bff0a..57c9dfe 100644 --- a/fs/btrfs/dedup.c +++ b/fs/btrfs/dedup.c @@ -255,3 +255,91 @@ int btrfs_dedup_add(struct btrfs_trans_handle *trans, return inmem_add(dedup_info, hash); return -EINVAL; } + +static struct inmem_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 inmem_hash *entry = NULL; + + while (*p) { + parent = *p; + entry = rb_entry(parent, struct inmem_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 inmem_hash *hash; + + mutex_lock(&dedup_info->lock); + hash = inmem_search_bytenr(dedup_info, bytenr); + if (!hash) { + mutex_unlock(&dedup_info->lock); + return 0; + } + + __inmem_del(dedup_info, hash); + mutex_unlock(&dedup_info->lock); + return 0; +} + +/* Remove a dedup hash from dedup tree */ +int btrfs_dedup_del(struct btrfs_trans_handle *trans, + struct btrfs_dedup_info *dedup_info, u64 bytenr) +{ + 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_dedup_info *dedup_info) +{ + struct inmem_hash *entry, *tmp; + + mutex_lock(&dedup_info->lock); + list_for_each_entry_safe(entry, tmp, &dedup_info->lru_list, lru_list) + __inmem_del(dedup_info, entry); + mutex_unlock(&dedup_info->lock); +} + +int btrfs_dedup_disable(struct btrfs_fs_info *fs_info) +{ + struct btrfs_dedup_info *dedup_info; + + /* Here we don't want to increase refs of dedup_info */ + spin_lock(&fs_info->dedup_ref_lock); + dedup_info = fs_info->dedup_info; + + /* Block other caller from deduping */ + fs_info->dedup_info = NULL; + spin_unlock(&fs_info->dedup_ref_lock); + + if (!dedup_info) + return 0; + + /* Wait all existing callers exit */ + wait_event(dedup_info->refs_wq, atomic_read(&dedup_info->refs) == 0); + + /* now we are OK to clean up everything */ + if (dedup_info->backend == BTRFS_DEDUP_BACKEND_INMEMORY) + inmem_destroy(dedup_info); + + crypto_free_shash(dedup_info->dedup_driver); + kfree(dedup_info); + return 0; +}