[LU-15656] Deprecate legacy root squash mechanism

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.15.0
• Labels: sec
• Severity: 3
• Assignee: Sebastien Buisson
• Reporter: Sebastien Buisson

Description

The legacy root squash mechanism relies on 2 parameters:

• the root_squash parameter specifies the UID and GID to which the root user is squashed when accessing the Lustre file system;
• the nosquash_nids parameter specifies the set of clients to which root squash does not apply.

This legacy mechanism has become redundant with the ability provided by the nodemap feature to implement root squash, in a much more flexible way.

So for newer Lustre versions, we would like to prevent setting the root_squash and nosquash_nids parameters on newly formatted file systems. On upgraded file systems, it would still be possible to change the already set values.

Issue Links

• is duplicated by: LU-4990 nodemap: replace existing root squash code with default_nodemap handling
• is related to: LUDOC-505 set_param must not be used to set root squash parameters