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nfsd4: allow an EXCHANGE_ID to kill a 4.0 client 

Following rfc 5661 section 2.4.1, we can permit a 4.1 client to remove
an established 4.0 client's state.

(But we don't allow updates.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-05-12 21:32:30 -04:00
parent ea236d0704
commit 1a308118c2
1 changed files with 8 additions and 2 deletions
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10
fs/nfsd/nfs4state.c
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@ -1553,8 +1553,10 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
conf = find_confirmed_client_by_str(dname, strhashval);
if (conf) {
if (!clp_used_exchangeid(conf)) {
status = nfserr_clid_inuse; /* XXX: ? */
goto out;
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
status = nfserr_inval; /* buggy client */
goto out;
}
}
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
/* 18.35.4 case 9 */
@ -1574,6 +1576,10 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
expire_client(conf);
goto out_new;
}
if (!clp_used_exchangeid(conf)) {
status = nfserr_inval;
goto out;
}
/*
* Set bit when the owner id and verifier map to an already
* confirmed client id (18.35.3).