From patchwork Fri Apr 1 06:34:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 8720431 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9313F9FC89 for ; Fri, 1 Apr 2016 06:35:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 614A6203AA for ; Fri, 1 Apr 2016 06:35:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C35B203AE for ; Fri, 1 Apr 2016 06:35:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758301AbcDAGfh (ORCPT ); Fri, 1 Apr 2016 02:35:37 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:12218 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754119AbcDAGfb (ORCPT ); Fri, 1 Apr 2016 02:35:31 -0400 X-IronPort-AV: E=Sophos;i="5.20,367,1444665600"; d="scan'208";a="419971" Received: from unknown (HELO cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 01 Apr 2016 14:35:16 +0800 Received: from localhost.localdomain (unknown [10.167.226.34]) by cn.fujitsu.com (Postfix) with ESMTP id D31394056404; Fri, 1 Apr 2016 14:35:14 +0800 (CST) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Wang Xiaoguang Subject: [PATCH v10 02/21] btrfs: dedupe: Introduce function to initialize dedupe info Date: Fri, 1 Apr 2016 14:34:53 +0800 Message-Id: <1459492512-31435-3-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1459492512-31435-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1459492512-31435-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: D31394056404.AB7F7 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: quwenruo@cn.fujitsu.com X-Spam-Status: No, score=-7.9 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 Add generic function to initialize dedupe info. Signed-off-by: Qu Wenruo Signed-off-by: Wang Xiaoguang --- fs/btrfs/Makefile | 2 +- fs/btrfs/dedupe.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/dedupe.h | 16 +++++- 3 files changed, 169 insertions(+), 3 deletions(-) create mode 100644 fs/btrfs/dedupe.c diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 128ce17..1b8c627 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -9,7 +9,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ export.o tree-log.o free-space-cache.o zlib.o lzo.o \ compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \ - uuid-tree.o props.o hash.o free-space-tree.o + uuid-tree.o props.o hash.o free-space-tree.o dedupe.o btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c new file mode 100644 index 0000000..2211588 --- /dev/null +++ b/fs/btrfs/dedupe.c @@ -0,0 +1,154 @@ +/* + * Copyright (C) 2016 Fujitsu. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ +#include "ctree.h" +#include "dedupe.h" +#include "btrfs_inode.h" +#include "transaction.h" +#include "delayed-ref.h" + +struct inmem_hash { + struct rb_node hash_node; + struct rb_node bytenr_node; + struct list_head lru_list; + + u64 bytenr; + u32 num_bytes; + + u8 hash[]; +}; + +static int init_dedupe_info(struct btrfs_dedupe_info **ret_info, u16 type, + u16 backend, u64 blocksize, u64 limit) +{ + struct btrfs_dedupe_info *dedupe_info; + + dedupe_info = kzalloc(sizeof(*dedupe_info), GFP_NOFS); + if (!dedupe_info) + return -ENOMEM; + + dedupe_info->hash_type = type; + dedupe_info->backend = backend; + dedupe_info->blocksize = blocksize; + dedupe_info->limit_nr = limit; + + /* only support SHA256 yet */ + dedupe_info->dedupe_driver = crypto_alloc_shash("sha256", 0, 0); + if (IS_ERR(dedupe_info->dedupe_driver)) { + int ret; + + ret = PTR_ERR(dedupe_info->dedupe_driver); + kfree(dedupe_info); + return ret; + } + + dedupe_info->hash_root = RB_ROOT; + dedupe_info->bytenr_root = RB_ROOT; + dedupe_info->current_nr = 0; + INIT_LIST_HEAD(&dedupe_info->lru_list); + mutex_init(&dedupe_info->lock); + + *ret_info = dedupe_info; + return 0; +} + +static int check_dedupe_parameter(struct btrfs_fs_info *fs_info, u16 hash_type, + u16 backend, u64 blocksize, u64 limit_nr, + u64 limit_mem, u64 *ret_limit) +{ + if (blocksize > BTRFS_DEDUPE_BLOCKSIZE_MAX || + blocksize < BTRFS_DEDUPE_BLOCKSIZE_MIN || + blocksize < fs_info->tree_root->sectorsize || + !is_power_of_2(blocksize)) + return -EINVAL; + /* + * For new backend and hash type, we return special return code + * as they can be easily expended. + */ + if (hash_type >= ARRAY_SIZE(btrfs_dedupe_sizes)) + return -EOPNOTSUPP; + if (backend >= BTRFS_DEDUPE_BACKEND_COUNT) + return -EOPNOTSUPP; + + /* Backend specific check */ + if (backend == BTRFS_DEDUPE_BACKEND_INMEMORY) { + if (!limit_nr && !limit_mem) + *ret_limit = BTRFS_DEDUPE_LIMIT_NR_DEFAULT; + else { + u64 tmp = (u64)-1; + + if (limit_mem) { + tmp = limit_mem / (sizeof(struct inmem_hash) + + btrfs_dedupe_hash_size(hash_type)); + /* Too small limit_mem to fill a hash item */ + if (!tmp) + return -EINVAL; + } + if (!limit_nr) + limit_nr = (u64)-1; + + *ret_limit = min(tmp, limit_nr); + } + } + if (backend == BTRFS_DEDUPE_BACKEND_ONDISK) + *ret_limit = 0; + return 0; +} + +int btrfs_dedupe_enable(struct btrfs_fs_info *fs_info, u16 type, u16 backend, + u64 blocksize, u64 limit_nr, u64 limit_mem) +{ + struct btrfs_dedupe_info *dedupe_info; + u64 limit = 0; + int ret = 0; + + /* only one limit is accepted for enable*/ + if (limit_nr && limit_mem) + return -EINVAL; + + ret = check_dedupe_parameter(fs_info, type, backend, blocksize, + limit_nr, limit_mem, &limit); + if (ret < 0) + return ret; + + dedupe_info = fs_info->dedupe_info; + if (dedupe_info) { + /* Check if we are re-enable for different dedupe config */ + if (dedupe_info->blocksize != blocksize || + dedupe_info->hash_type != type || + dedupe_info->backend != backend) { + btrfs_dedupe_disable(fs_info); + goto enable; + } + + /* On-fly limit change is OK */ + mutex_lock(&dedupe_info->lock); + fs_info->dedupe_info->limit_nr = limit; + mutex_unlock(&dedupe_info->lock); + return 0; + } + +enable: + ret = init_dedupe_info(&dedupe_info, type, backend, blocksize, limit); + if (ret < 0) + return ret; + fs_info->dedupe_info = dedupe_info; + /* We must ensure dedupe_enabled is modified after dedupe_info */ + smp_wmb(); + fs_info->dedupe_enabled = 1; + return ret; +} diff --git a/fs/btrfs/dedupe.h b/fs/btrfs/dedupe.h index 40f4808..e5d0d34 100644 --- a/fs/btrfs/dedupe.h +++ b/fs/btrfs/dedupe.h @@ -39,6 +39,9 @@ #define BTRFS_DEDUPE_BLOCKSIZE_MIN (16 * 1024) #define BTRFS_DEDUPE_BLOCKSIZE_DEFAULT (128 * 1024) +/* Default dedupe limit on number of hash */ +#define BTRFS_DEDUPE_LIMIT_NR_DEFAULT (32 * 1024) + /* Hash algorithm, only support SHA256 yet */ #define BTRFS_DEDUPE_HASH_SHA256 0 @@ -81,8 +84,17 @@ static inline int btrfs_dedupe_hash_hit(struct btrfs_dedupe_hash *hash) return (hash && hash->bytenr); } -int btrfs_dedupe_hash_size(u16 type); -struct btrfs_dedupe_hash *btrfs_dedupe_alloc_hash(u16 type); +static inline int btrfs_dedupe_hash_size(u16 type) +{ + if (WARN_ON(type >= ARRAY_SIZE(btrfs_dedupe_sizes))) + return -EINVAL; + return sizeof(struct btrfs_dedupe_hash) + btrfs_dedupe_sizes[type]; +} + +static inline struct btrfs_dedupe_hash *btrfs_dedupe_alloc_hash(u16 type) +{ + return kzalloc(btrfs_dedupe_hash_size(type), GFP_NOFS); +} /* * Initial inband dedupe info