From: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com> Add generic function to initialize dedup info.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> Signed-off-by: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com> --- fs/btrfs/Makefile | 2 +- fs/btrfs/dedup.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/dedup.h | 17 ++++++++-- 3 files changed, 113 insertions(+), 3 deletions(-) create mode 100644 fs/btrfs/dedup.c diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 128ce17..a6207ff 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 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..2abe178 --- /dev/null +++ b/fs/btrfs/dedup.c @@ -0,0 +1,97 @@ +/* + * 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_nr) +{ + struct btrfs_dedup_info *dedup_info; + u64 limit = limit_nr; + 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_nr == 0) + limit = 4096; /* default value */ + if (backend == BTRFS_DEDUP_BACKEND_ONDISK && limit_nr != 0) + limit = 0; + + dedup_info = fs_info->dedup_info; + if (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 */ + mutex_lock(&dedup_info->lock); + fs_info->dedup_info->limit_nr = limit; + mutex_unlock(&dedup_info->lock); + return 0; + } + +enable: + dedup_info = kzalloc(sizeof(*dedup_info), GFP_NOFS); + if (dedup_info) + return -ENOMEM; + + 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); + mutex_init(&dedup_info->lock); + + fs_info->dedup_info = dedup_info; + /* We must ensure dedup_enabled is modified after dedup_info */ + smp_wmb(); + fs_info->dedup_enabled = 1; + +out: + if (ret < 0) + kfree(dedup_info); + return ret; +} diff --git a/fs/btrfs/dedup.h b/fs/btrfs/dedup.h index 8e1ff03..83a7512 100644 --- a/fs/btrfs/dedup.h +++ b/fs/btrfs/dedup.h @@ -37,6 +37,9 @@ #define BTRFS_DEDUP_BLOCKSIZE_MIN (16 * 1024) #define BTRFS_DEDUP_BLOCKSIZE_DEFAULT (128 * 1024) +/* Default dedup limit on number of hash */ +#define BTRFS_DEDUP_LIMIT_NR_DEFAULT (32 * 1024) + /* Hash algorithm, only support SHA256 yet */ #define BTRFS_DEDUP_HASH_SHA256 0 @@ -74,8 +77,18 @@ 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 -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html