From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([59.151.112.132]:1693 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753274AbbL2IC1 (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 CAE7540427F0 for ; Tue, 29 Dec 2015 16:01:25 +0800 (CST) From: Qu Wenruo To: CC: Wang Xiaoguang Subject: [PATCH 02/14] btrfs: dedup: Introduce function to initialize dedup info Date: Tue, 29 Dec 2015 16:01:11 +0800 Message-ID: <1451376083-30474-3-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 Add generic function to initialize dedup info. Signed-off-by: Qu Wenruo Signed-off-by: Wang Xiaoguang --- fs/btrfs/Makefile | 2 +- fs/btrfs/dedup.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/dedup.h | 14 ++++++-- 3 files changed, 109 insertions(+), 3 deletions(-) create mode 100644 fs/btrfs/dedup.c diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 6d1d0b9..a8bd917 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 + uuid-tree.o props.o hash.o dedup.o btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o diff --git a/fs/btrfs/dedup.c b/fs/btrfs/dedup.c new file mode 100644 index 0000000..c1fadff --- /dev/null +++ b/fs/btrfs/dedup.c @@ -0,0 +1,96 @@ +/* + * Copyright (C) 2015 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 "dedup.h" +#include "btrfs_inode.h" +#include "transaction.h" +#include "delayed-ref.h" + +int btrfs_dedup_enable(struct btrfs_fs_info *fs_info, u16 type, u16 backend, + u64 blocksize, u64 limit) +{ + struct btrfs_dedup_info *dedup_info; + int ret = 0; + + /* Sanity check */ + if (blocksize > BTRFS_DEDUP_BLOCKSIZE_MAX || + blocksize < BTRFS_DEDUP_BLOCKSIZE_MIN || + blocksize < fs_info->tree_root->sectorsize || + !is_power_of_2(blocksize)) + return -EINVAL; + if (type > ARRAY_SIZE(btrfs_dedup_sizes)) + return -EINVAL; + if (backend >= BTRFS_DEDUP_BACKEND_LAST) + return -EINVAL; + if (backend == BTRFS_DEDUP_BACKEND_INMEMORY && limit == 0) + limit = 4096; /* default value */ + if (backend == BTRFS_DEDUP_BACKEND_ONDISK && limit != 0) + limit = 0; + + if (fs_info->dedup_info) { + dedup_info = fs_info->dedup_info; + + /* Check if we are re-enable for different dedup config */ + if (dedup_info->blocksize != blocksize || + dedup_info->hash_type != type || + dedup_info->backend != backend) { + btrfs_dedup_disable(fs_info); + goto enable; + } + + /* On-fly limit change is OK */ + spin_lock(&dedup_info->lock); + fs_info->dedup_info->limit_nr = limit; + spin_unlock(&dedup_info->lock); + return 0; + } + +enable: + fs_info->dedup_info = kzalloc(sizeof(*dedup_info), GFP_NOFS); + if (!fs_info->dedup_info) + return -ENOMEM; + + dedup_info = fs_info->dedup_info; + + dedup_info->hash_type = type; + dedup_info->backend = backend; + dedup_info->blocksize = blocksize; + dedup_info->limit_nr = limit; + + /* Only support SHA256 yet */ + dedup_info->dedup_driver = crypto_alloc_shash("sha256", 0, 0); + if (IS_ERR(dedup_info->dedup_driver)) { + btrfs_err(fs_info, "failed to init sha256 driver"); + ret = PTR_ERR(dedup_info->dedup_driver); + goto out; + } + + dedup_info->hash_root = RB_ROOT; + dedup_info->bytenr_root = RB_ROOT; + dedup_info->current_nr = 0; + INIT_LIST_HEAD(&dedup_info->lru_list); + spin_lock_init(&dedup_info->lock); + + fs_info->dedup_info = dedup_info; +out: + if (ret < 0) { + kfree(dedup_info); + fs_info->dedup_info = NULL; + } + return ret; +} diff --git a/fs/btrfs/dedup.h b/fs/btrfs/dedup.h index fd2e392..3cd6d14 100644 --- a/fs/btrfs/dedup.h +++ b/fs/btrfs/dedup.h @@ -79,8 +79,18 @@ struct btrfs_dedup_info { struct btrfs_trans_handle; -int btrfs_dedup_hash_size(u16 type); -struct btrfs_dedup_hash *btrfs_dedup_alloc_hash(u16 type); +static inline int btrfs_dedup_hash_size(u16 type) +{ + if (WARN_ON(type >= ARRAY_SIZE(btrfs_dedup_sizes))) + return -EINVAL; + return sizeof(struct btrfs_dedup_hash) + btrfs_dedup_sizes[type]; +} + +static inline struct btrfs_dedup_hash *btrfs_dedup_alloc_hash(u16 type) +{ + return kzalloc(btrfs_dedup_hash_size(type), GFP_NOFS); +} + /* * Initial inband dedup info -- 2.6.4