ext4_register_li_request

int ext4_register_li_request(struct super_block *sb,     ext4_group_t first_not_zeroed){struct ext4_sb_info *sbi = EXT4_SB(sb);struct ext4_li_request *elr = NULL;ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;int ret = 0;mutex_lock(&ext4_li_mtx);if (sbi->s_li_request != NULL) {/* * Reset timeout so it can be computed again, because * s_li_wait_mult might have changed. */sbi->s_li_request->lr_timeout = 0;goto out;}if (first_not_zeroed == ngroups ||    (sb->s_flags & MS_RDONLY) ||    !test_opt(sb, INIT_INODE_TABLE))goto out;elr = ext4_li_request_new(sb, first_not_zeroed);if (!elr) {ret = -ENOMEM;goto out;}if (NULL == ext4_li_info) {ret = ext4_li_info_new();if (ret)goto out;}mutex_lock(&ext4_li_info->li_list_mtx);list_add(&elr->lr_request, &ext4_li_info->li_request_list);mutex_unlock(&ext4_li_info->li_list_mtx);sbi->s_li_request = elr;/* * set elr to NULL here since it has been inserted to * the request_list and the removal and free of it is * handled by ext4_clear_request_list from now on. */elr = NULL;if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {ret = ext4_run_lazyinit_thread();if (ret)goto out;}out:mutex_unlock(&ext4_li_mtx);if (ret)kfree(elr);return ret;}