为方便用户使用PaddleFlow存储功能，不过多依赖其他模块，现PaddleFlow存储模块提供存储管理的相关接口以及mount的相关接口，方便用户快速使用PaddleFlow的功能。
fs 提供了create,show, delete, list, mount，link,unlink, listlink, showlink九种不同的方法。 九种不同操作的示例如下：
paddleflow fs list -u username// 展示fs列表 -u 表示特定用户的fs
paddleflow fs show fsname -u username// 显示某个fs详情 -u 表示特定用户的fs
paddleflow fs delete fsname -u username // 删除某个fs -u 表示特定用户的fs
paddleflow fs create fsname url -o ak=xxx -o sk=xxx //创建fs
paddleflow fs mount fsname /home/mountpath -u username //把某个文件系统挂载到本地
paddleflow fs link fsname fspath url -o ak=xxx -o sk=xxx -u username //创建link -u 表示特定用户的fs
paddleflow fs unlink fsname fspath -u username // 删除某个特定用户特点文件系统下的link -u 表示特定用户的fs
paddleflow fs listlink fsname -u username// 展示某个文件系统下面的link列表 -u 表示特定用户的fs
paddleflow fs showlink fsname fspath -u username// 显示某个link详情 -u 表示特定用户的fs存储列表：用户输入paddleflow fs list
+----------+---------+--------+-----------------------------------+--------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | owner | type | server address | sub path | properties |
+==========+=========+========+===================================+====================+=============================================================================================================================================================================================================================================+
| sftp1 | root | sftp | localhost:8001 | /data2 | {'password': 'xxx', 'user': 'xxx'} |
+----------+---------+--------+-----------------------------------+--------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| hdfs1 | root | hdfs | 192.168.1.2:9000,192.168.1.3:9000 | /elsiefs | {'dfs.namenode.address': '192.168.1.2:9000,192.168.1.3:9000', 'group': 'test', 'user': 'test'}存储详情：用户输入paddleflow fs show {fs_name}，界面上显示
+--------+---------+--------+------------------+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | owner | type | server address | sub path | properties |
+========+=========+========+==================+============+=============================================================================================================================================================================================================================================+
| s3-1 | root | s3 | s3.com | /myfs1 | {'accessKey': 'xxx', 'bucket': 'test', 'endpoint': 's3.com', 'region': 'bj', 'secretKey': 'xxx'} |
+--------+---------+--------+------------------+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+创建存储：用户输入paddleflow fs create {fs_name} {fs_url} -o {}，可以通过paddleflow fs create --help查看具体创建选项,界面上显示，查看不同类型存储创建方式
fs[{fs_name}] create success
删除存储：用户输入paddleflow fs delete {fs_name}，界面上显示
fs[{fs_name}] delete success
mount命令：用户输入paddleflow fs mount {fs_name} {mountpath}，界面上显示
mount success，还可以通过paddleflow fs mount --help查看挂载其他详细参数，如下
Usage: paddleflow fs mount [OPTIONS] FSNAME PATH
mount fs
FSNAME: mount fs name which contain mount fs and mount path
PATH: your local mount path
Options:
-u, --username TEXT Mount the specified fs by username, only useful for root.
-o, --o TEXT mount options:
-o block-size: data cache block size (default: 20971520), if block-size equals to 0, it means that no data cache is used
-o data-cache-path: directory path of local data cache (default:"/var/cache/pfs-cache-dir/data-cache")
-o data-cache-expire: file data cache timeout (default 0s)
-o meta-cache-path: directory path of meta cache (default:"/var/cache/pfs-cache-dir/meta-cache")
-o meta-cache-driver: meta driver type (e.g. mem, disk)",
-o meta-cache-expire: file meta cache timeout (default 5s)
-o entry-cache-expire: file entry cache timeout (default 5s)
某个文件系统下的Link列表：用户输入paddleflow fs listlink {fsname}
+----------+---------+--------+------------+------------------+--------------------+-------------------+
| name | owner | type | fs path | server address | sub path | properties |
+==========+=========+========+============+==================+====================+===================+
| local12 | root | local | /linktest1 | | /home/yoursubpath/1| {'debug': 'true'} |
+----------+---------+--------+------------+------------------+--------------------+-------------------+
| local12 | root | local | /linktest2 | | /home/yoursubpath/1| {'debug': 'true'} |
+----------+---------+--------+------------+------------------+--------------------+-------------------+某个Link详情：用户输入paddleflow fs showlink {fsname} {fspath}，界面上显示
+----------+---------+--------+------------+------------------+--------------------+-------------------+
| name | owner | type | fs path | server address | sub path | properties |
+==========+=========+========+============+==================+====================+===================+
| local12 | root | local | /linktest1 | | /home/yoursubpath/7| {'debug': 'true'} |
+----------+---------+--------+------------+------------------+--------------------+-------------------+创建link：用户输入paddleflow fs link {fs_name} {fspath} {fs_url} -o {}，可以通过paddleflow fs link --help查看具体创建选项,界面上显示
fs[{fs_name}] create link success
删除link：用户输入paddleflow fs unlink {fs_name} {fspath}，界面上显示
fs[{fs_name}] delete link success