NLM - set per fsid grace period
Subsystems (2)
PATCH 2/4 NLM - set per fsid grace period
This change enables per NFS-export entry lockd grace period. The implementation is based on a double linked list fo_fsid_list that contains entries of fsid info. It is expected this would not be a frequent event. The fo_fsid_list is short and the entries expire within a maximum of 50 seconds. The grace period setting follows the existing NLM grace period handling logic and is triggered via echoing the NFS export filesystem id into nfsd procfs entry as:
shell> echo 1234 > nlm_set_grace_for_fsid
-- Wendy
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Quoted 7 lines · Wendy Cheng
This change enables per NFS-export entry lockd grace period. The implementation is based on a double linked list
fo_fsid_listthat contains entries of fsid info. It is expected this would not be a frequent event. Thefo_fsid_listis short and the entries expire within a maximum of 50 seconds. The grace period setting follows the existing NLM grace period handling logic and is triggered via echoing the NFS export filesystem id into nfsd procfs entry as:
Your patch creates a new per-export structure that is private to lockd. It may be easier to put the grace period value into the export entry, and check for that in nlm_fopen. It feels more natural than adding a whole new shadow export table just for the benefit of lockd. (Especially when you consider future extensions like being able to search the list by dev_t or uuid or whatever)
Olaf
Signature · 11 lines
Olaf Kirch | --- o --- Nous sommes du soleil we love when we play [email protected] | / | \ sol.dhoop.naytheet.ah kin.ir.samse.qurax ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ NFS maillist - [email protected] https://lists.sourceforge.net/lists/listinfo/nfs
Quoted 11 lines · Olaf Kirch
Quoted 8 lines · Wendy Cheng
This change enables per NFS-export entry lockd grace period. The implementation is based on a double linked list
fo_fsid_listthat contains entries of fsid info. It is expected this would not be a frequent event. Thefo_fsid_listis short and the entries expire within a maximum of 50 seconds. The grace period setting follows the existing NLM grace period handling logic and is triggered via echoing the NFS export filesystem id into nfsd procfs entry as:
Quoted 7 lines
Your patch creates a new per-export structure that is private to lockd. It may be easier to put the grace period value into the export entry, and check for that in
nlm_fopen. It feels more natural than adding a whole new shadow export table just for the benefit of lockd. (Especially when you consider future extensions like being able to search the list bydev_tor uuid or whatever)
I'm traveling so may not be able to do intelligent responses until next Monday.
However, I should have made it clear that these patches are minimum changes to keep NFS V3 failover going due to large amount of existing installations and users. The real efforts and future enhancements should be placed on NFS V4. That's the reason most of the code in this patch set are stand-alone addition and I have been trying not to mingle the changes with main-line nfsd-lockd code.
Ideally we would like to avoid this grace period eventually if we can (by transferring the locks from one server to another server without NFS clients' involvement).
-- Wendy
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