[LU-5989] add subdirectory mounting support for lustre

• Type: New Feature
• Resolution: Duplicate
• Priority: Minor
• Labels: patch
• Assignee: Yang Sheng
• Reporter: Wang Shilong (Inactive)

Description

We might need subdirectory export for Lustre, just like NFS, we could use
it from clients something like this:

mount -t lustre xxxxx -o subdir="/test_dir" <mnt>

Actually, we could implement it using a recursive way, we filter out mount options so that second mount will stop.

Issue Links

• is related to: LU-28 Ability for client to mount subdirectories of a Lustre filesystem