nfsd41: Use separate DRC for setclientid
Instead of trying to share the generic 4.1 reply cache code for the
CREATE_SESSION reply cache, it's simpler to handle CREATE_SESSION
separately.
The nfs41 single slot clientid DRC holds the results of create session
processing. CREATE_SESSION can be preceeded by a SEQUENCE operation
(an embedded CREATE_SESSION) and the create session single slot cache must be
maintained. nfsd4_replay_cache_entry() and nfsd4_store_cache_entry() do not
implement the replay of an embedded CREATE_SESSION.
The clientid DRC slot does not need the inuse, cachethis or other fields that
the multiple slot session cache uses. Replace the clientid DRC cache struct
nfs4_slot cache with a new nfsd4_clid_slot cache. Save the xdr struct
nfsd4_create_session into the cache at the end of processing, and on a replay,
replace the struct for the replay request with the cached version all while
under the state lock.
nfsd4_proc_compound will handle both the solo and embedded CREATE_SESSION case
via the normal use of encode_operation.
Errors that do not change the create session cache:
A create session NFS4ERR_STALE_CLIENTID error means that a client record
(and associated create session slot) could not be found and therefore can't
be changed. NFSERR_SEQ_MISORDERED errors do not change the slot cache.
All other errors get cached.
Remove the clientid DRC specific check in nfs4svc_encode_compoundres to
put the session only if cstate.session is set which will now always be true.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index a6c87d6..58bb197 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -127,6 +127,25 @@
u32 rdma_attrs;
};
+struct nfsd4_create_session {
+ clientid_t clientid;
+ struct nfs4_sessionid sessionid;
+ u32 seqid;
+ u32 flags;
+ struct nfsd4_channel_attrs fore_channel;
+ struct nfsd4_channel_attrs back_channel;
+ u32 callback_prog;
+ u32 uid;
+ u32 gid;
+};
+
+/* The single slot clientid cache structure */
+struct nfsd4_clid_slot {
+ u32 sl_seqid;
+ __be32 sl_status;
+ struct nfsd4_create_session sl_cr_ses;
+};
+
struct nfsd4_session {
struct kref se_ref;
struct list_head se_hash; /* hash by sessionid */
@@ -193,7 +212,7 @@
/* for nfs41 */
struct list_head cl_sessions;
- struct nfsd4_slot cl_slot; /* create_session slot */
+ struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
u32 cl_exchange_flags;
struct nfs4_sessionid cl_sessionid;
};