[LU-19884] New 'mdt.*.enable_foreign_dir' and 'mdt.*.enable_foreign_dir_gid' parameters

• Type: New Feature
• Resolution: Fixed
• Priority: Medium
• Fix Version/s: Lustre 2.18.0
• Affects Version/s: Lustre 2.18.0
• Labels: dne layout medium
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Colin Faber - TLC

Description

Background: the setdirstripe LMV for remote directories and the LMV for DAOS foreign layouts represent similar directory layouts but differ in content: in the DAOS case, it describes a "directory tree" stored externally to Lustre. The existing enable_remote_dir_gid parameter controls which group can explicitly create subdirectories on MDTs other than the parent's (e.g., root only, a designated admin/power user group, or any user). 

The proposed change will introduce a new tunable "enable_foreign_dir" which will will separate control of foreign directories from enable_remote_* control.

This will allow the governing of foreign creation on remote DAOS "directories" and by whom.

Issue Links

• is related to: LU-11429 MDT parameter enable_remote_dir should be renamed
• is related to: LU-11376 Special file/dir to represent DAOS Containers
• is related to: LU-3537 allow cross-MDT for all metadata operations
• is related to: LU-16524 Limit capabilities of local admin