On 04/01/2016 02:35 AM, Qu Wenruo wrote:
Since we will introduce a new on-disk based dedupe method, introduce new interfaces to resume previous dedupe setup.And since we introduce a new tree for status, also add disable handler for it. Signed-off-by: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com> Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> --- fs/btrfs/dedupe.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++++- fs/btrfs/dedupe.h | 13 ++++ fs/btrfs/disk-io.c | 25 ++++++- fs/btrfs/disk-io.h | 1 + 4 files changed, 232 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c index cfb7fea..a274c1c 100644 --- a/fs/btrfs/dedupe.c +++ b/fs/btrfs/dedupe.c @@ -21,6 +21,8 @@ #include "transaction.h" #include "delayed-ref.h" #include "qgroup.h" +#include "disk-io.h" +#include "locking.h" struct inmem_hash { struct rb_node hash_node; @@ -102,10 +104,69 @@ static int init_dedupe_info(struct btrfs_dedupe_info **ret_info, u16 type, return 0; } +static int init_dedupe_tree(struct btrfs_fs_info *fs_info, + struct btrfs_dedupe_info *dedupe_info) +{ + struct btrfs_root *dedupe_root; + struct btrfs_key key; + struct btrfs_path *path; + struct btrfs_dedupe_status_item *status; + struct btrfs_trans_handle *trans; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + trans = btrfs_start_transaction(fs_info->tree_root, 2); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + dedupe_root = btrfs_create_tree(trans, fs_info, + BTRFS_DEDUPE_TREE_OBJECTID); + if (IS_ERR(dedupe_root)) { + ret = PTR_ERR(dedupe_root); + btrfs_abort_transaction(trans, fs_info->tree_root, ret); + goto out; + } + dedupe_info->dedupe_root = dedupe_root; + + key.objectid = 0; + key.type = BTRFS_DEDUPE_STATUS_ITEM_KEY; + key.offset = 0; + + ret = btrfs_insert_empty_item(trans, dedupe_root, path, &key, + sizeof(*status)); + if (ret < 0) { + btrfs_abort_transaction(trans, fs_info->tree_root, ret); + goto out; + } + + status = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_dedupe_status_item); + btrfs_set_dedupe_status_blocksize(path->nodes[0], status, + dedupe_info->blocksize); + btrfs_set_dedupe_status_limit(path->nodes[0], status, + dedupe_info->limit_nr); + btrfs_set_dedupe_status_hash_type(path->nodes[0], status, + dedupe_info->hash_type); + btrfs_set_dedupe_status_backend(path->nodes[0], status, + dedupe_info->backend); + btrfs_mark_buffer_dirty(path->nodes[0]); +out: + btrfs_free_path(path); + if (ret == 0) + btrfs_commit_transaction(trans, fs_info->tree_root);
Still need to call btrfs_end_transaction() if we aborted to clean things up. Thanks,
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