[LU-9293] ocd_ibits_known is not checked

• Status: Closed
• Project: Lustre
• Type: Bug
• Priority: Minor
• Reporter: Mikhail Pershin
• Assignee: Mikhail Pershin
• Resolution: Fixed
• Severity: 3

Description

the ocd_ibits_known field contains supported MDS inodebits from the client/server and maintained properly on both sides but not used anywhere. The only case is mdc_lock_match() where it is checked to exclude bits not supported on server.
Meanwhile the LOV sets ocd_ibits_known to MDS_INODEBITS_UPDATE only, but MDT-MDT locks can be LOOKUP and XATTR at the same time and everything works just fine.
That makes no sense so cleanup is needed in this area to use ocd_ibits_known properly and check it against enqueued locks.

Issue Links

• is related to: LU-10175 DoM:Full support for the LDLM lock co...

Comments

[Andreas Dilger]

I also see ocd_ibits_known being checked in client_common_fill_super() and mdc_xattr_common() to enable the xattr cache (MDS_INODELOCK_XATTR). The only other new ibits types are:

• MDS_INODELOCK_LAYOUT but the "interoperability" of that flag has already passed (I don't recall exact details) so all clients and servers are assumed to have this support.
• MDS_INODELOCK_PERM is masked on the client by mdc_lock_match() so I don't think there needs to be a compatibility check. Older servers and clients don't require this since it is only for DNE.

[Andreas Dilger]

Mike, is this still an issue?