[LU-7335] store default filesystem layout directly on root inode

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: Lustre 2.9.0
• Labels: medium
• Assignee: Lai Siyao
• Reporter: Andreas Dilger

Description

The use of lov_desc to store the default filesystem layout is restrictive as new layout types are added, and prevents functionality such as using "lfs setstripe" to set a default pool for the filesystem.

The default layout xattr should actually be stored directly on the filesystem root inode, instead of just virtually using that as meaning "store the default layout into lov_desc". That would avoid any feature problems as new layout types are added in the future, since it will just be storing a layout xattr.

Issue Links

• is related to: LU-7813 default pool not inherited when specifying any layout parameter
• is related to: LU-7660 FS default striping settings only honored on MDT 0