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NFSD: Document the phases of CREATE_SESSION

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As described in RFC 8881 Section 18.36.4, CREATE_SESSION can be
split into four phases. NFSD's implementation now does it like that
description.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2024-02-08 11:00:35 -05:00
parent e4469c6cc6
commit b910544a5a
1 changed files with 6 additions and 0 deletions
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6
fs/nfsd/nfs4state.c
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@ -3762,6 +3762,8 @@ nfsd4_create_session(struct svc_rqst *rqstp,
goto out_free_session;
spin_lock(&nn->client_lock);
/* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */
unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
conf = find_confirmed_client(&cr_ses->clientid, true, nn);
if (!conf && !unconf) {
@ -3769,6 +3771,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
goto out_free_conn;
}
/* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */
if (conf)
cs_slot = &conf->cl_cs_slot;
else
@ -3784,6 +3787,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
cs_slot->sl_seqid++;
cr_ses->seqid = cs_slot->sl_seqid;
/* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */
if (conf) {
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(conf, rqstp))
@ -3810,6 +3814,8 @@ nfsd4_create_session(struct svc_rqst *rqstp,
move_to_confirmed(unconf);
conf = unconf;
}
/* RFC 8881 Section 18.36.4 Phase 4: Session creation. */
status = nfs_ok;
/* Persistent sessions are not supported */
cr_ses->flags &= ~SESSION4_PERSIST;