nfsd41: sessionid hashing

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Simple sessionid hashing using its monotonically increasing sequence number.

Locking considerations:
sessionid_hashtbl access is controlled by the sessionid_lock spin lock.
It must be taken for insert, delete, and lookup.
nfsd4_sequence looks up the session id and if the session is found,
it calls nfsd4_get_session (still under the sessionid_lock).
nfsd4_destroy_session calls nfsd4_put_session after unhashing
it, so when the session's kref reaches zero it's going to get freed.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[we don't use a prime for sessionid hash table size]
[use sessionid_lock spin lock]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

...

This commit is contained in:

Marc Eshel 2009-04-03 08:27:52 +03:00 • committed by J. Bruce Fields

parent c4bf786806

commit 5282fd724b

2 changed files with 61 additions and 1 deletions

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55

fs/nfsd/nfs4state.c

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7

include/linux/nfsd/state.h

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