From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([222.73.24.84]:35808 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1758135AbcCVBit (ORCPT ); Mon, 21 Mar 2016 21:38:49 -0400 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Wang Xiaoguang Subject: [PATCH v8 14/27] btrfs: dedupe: Add support for adding hash for on-disk backend Date: Tue, 22 Mar 2016 09:35:39 +0800 Message-Id: <1458610552-9845-15-git-send-email-quwenruo@cn.fujitsu.com> In-Reply-To: <1458610552-9845-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1458610552-9845-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Now on-disk backend can add hash now. Signed-off-by: Wang Xiaoguang Signed-off-by: Qu Wenruo --- fs/btrfs/dedupe.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c index c38137e..6a80afc 100644 --- a/fs/btrfs/dedupe.c +++ b/fs/btrfs/dedupe.c @@ -405,6 +405,87 @@ out: return 0; } +static int ondisk_search_bytenr(struct btrfs_trans_handle *trans, + struct btrfs_dedupe_info *dedupe_info, + struct btrfs_path *path, u64 bytenr, + int prepare_del); +static int ondisk_search_hash(struct btrfs_dedupe_info *dedupe_info, u8 *hash, + u64 *bytenr_ret, u32 *num_bytes_ret); +static int ondisk_add(struct btrfs_trans_handle *trans, + struct btrfs_dedupe_info *dedupe_info, + struct btrfs_dedupe_hash *hash) +{ + struct btrfs_path *path; + struct btrfs_root *dedupe_root = dedupe_info->dedupe_root; + struct btrfs_key key; + struct btrfs_dedupe_hash_item *hash_item; + u64 bytenr; + u32 num_bytes; + int hash_len = btrfs_dedupe_sizes[dedupe_info->hash_type]; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + mutex_lock(&dedupe_info->lock); + + ret = ondisk_search_bytenr(NULL, dedupe_info, path, hash->bytenr, 0); + if (ret < 0) + goto out; + if (ret > 0) { + ret = 0; + goto out; + } + btrfs_release_path(path); + + ret = ondisk_search_hash(dedupe_info, hash->hash, &bytenr, &num_bytes); + if (ret < 0) + goto out; + /* Same hash found, don't re-add to save dedupe tree space */ + if (ret > 0) { + ret = 0; + goto out; + } + + /* Insert hash->bytenr item */ + memcpy(&key.objectid, hash->hash + hash_len - 8, 8); + key.type = BTRFS_DEDUPE_HASH_ITEM_KEY; + key.offset = hash->bytenr; + + ret = btrfs_insert_empty_item(trans, dedupe_root, path, &key, + sizeof(*hash_item) + hash_len); + WARN_ON(ret == -EEXIST); + if (ret < 0) + goto out; + hash_item = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_dedupe_hash_item); + btrfs_set_dedupe_hash_len(path->nodes[0], hash_item, hash->num_bytes); + write_extent_buffer(path->nodes[0], hash->hash, + (unsigned long)(hash_item + 1), hash_len); + btrfs_mark_buffer_dirty(path->nodes[0]); + btrfs_release_path(path); + + /* Then bytenr->hash item */ + key.objectid = hash->bytenr; + key.type = BTRFS_DEDUPE_BYTENR_ITEM_KEY; + memcpy(&key.offset, hash->hash + hash_len - 8, 8); + + ret = btrfs_insert_empty_item(trans, dedupe_root, path, &key, hash_len); + WARN_ON(ret == -EEXIST); + if (ret < 0) + goto out; + write_extent_buffer(path->nodes[0], hash->hash, + btrfs_item_ptr_offset(path->nodes[0], path->slots[0]), + hash_len); + btrfs_mark_buffer_dirty(path->nodes[0]); + +out: + mutex_unlock(&dedupe_info->lock); + btrfs_free_path(path); + return ret; +} + int btrfs_dedupe_add(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info, struct btrfs_dedupe_hash *hash) @@ -426,6 +507,8 @@ int btrfs_dedupe_add(struct btrfs_trans_handle *trans, if (dedupe_info->backend == BTRFS_DEDUPE_BACKEND_INMEMORY) return inmem_add(dedupe_info, hash); + if (dedupe_info->backend == BTRFS_DEDUPE_BACKEND_ONDISK) + return ondisk_add(trans, dedupe_info, hash); return -EINVAL; } -- 2.7.3