enable user-defined extended attributes for ext3 file systems; 增加ext3 文件系統的擴展屬性；

To enable user-defined extended attributes for ext3 file systems (i.e. device), use:

tune2fs -o user_xattr /dev/device

Alternatively, extended attributes for a file system can be enabled at mount time, as in:

mount /dev/device /path/to/cache -o user_xattr

命令來自於：redhat 7 官方文檔；更多內容請關註 cnblogs.com/xuyaowen;