[LU-10873] Add support for used inode/space on MDT/OST proc

• Type: New Feature
• Resolution: Won't Do
• Priority: Minor
• Assignee: Qian Yingjin (Inactive)
• Reporter: Qian Yingjin (Inactive)

Description

We have a monitoring system which can get the informations from
the /proc entries of Lustre. However, the Lustre doesn't export the
used inode/space on MDT/OST, this patch adds used inode/space info
in osd/lod layer:

/proc/fs/lustre/osd-*/testfs-OST0000/filesused
/proc/fs/lustre/lod/testfs-MDT0000-mdtlov/filesused

/proc/fs/lustre/osd-*/testfs-OST0000/kbytesused
/proc/fs/lustre/lod/testfs-MDT0000-mdtlov/kbytesused