OpenAFS CVS Commit: openafs/src/WINNT/afsd by jaltman
Wed, 26 Dec 2007 11:18:38 EST
Update of /cvs/openafs/src/WINNT/afsd
In directory GRAND.CENTRAL.ORG:/home/jaltman/openafs/cvs-1-3/src/WINNT/afsd
The case of openafs.org and grand.central.org is a hideous abuse of
the AFS cell name space. There are many negatives associated with
trying to support two different cell names pointing at overlapping
(1) The CM can store duplicate entries for all of the data simply because
the cell name that was used is different
(2) If the CM attempts to optimize the data storage by aliasing or otherwise
combining the cell names as part of one cm_cell_t object, then future
attempts to separate the two cell names will require the destruction
of the cache.
(3) If the CM does not associate a callback revoke with a particular cell,
then the status data associated with any entry that matches the revoked
AFSFid will be discarded. For volume callbacks this can have a serious
impact because volume IDs are not unique across cells and discarding
status data for readonly volumes that are in use can result in a
significant number of FetchStatus requests being sent to the associated
There are other issues as well involving authentication.
The case of openafs.org advertising the vlserver addresses of
grand.central.org should be considered a hack; a hack that the Windows
client will no longer ensure will work.
Additional debugging messages have been added to assist individuals attempting
to debug why callback revokes do not appear to take affect when two cell
names share the same vlserver data.
--- DELTA config follows ---
windows-callback-restore-multi-cell-servers-20071226 openafs/src/WINNT/afsd/cm_callback.c 1.69 1.70
windows-callback-restore-multi-cell-servers-20071226 openafs/src/WINNT/afsd/cm_cell.c 1.31 1.32