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nfsd: fix clid_inuse on mount with security change 

In bakeathon testing Solaris client was getting CLID_INUSE error when
doing a krb5 mount soon after an auth_sys mount, or vice versa.

That's not really necessary since in this case the old client doesn't
have any state any more:

	http://tools.ietf.org/html/rfc7530#page-103

	"when the server gets a SETCLIENTID for a client ID that
	currently has no state, or it has state but the lease has
	expired, rather than returning NFS4ERR_CLID_INUSE, the server
	MUST allow the SETCLIENTID and confirm the new client ID if
	followed by the appropriate SETCLIENTID_CONFIRM."

This doesn't fix the problem completely since our client_has_state()
check counts openowners left around to handle close replays, which we
should probably just remove in this case.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2015-10-15 15:33:23 -04:00
parent 778620364e
commit 2b63482185
1 changed files with 8 additions and 2 deletions
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10
fs/nfsd/nfs4state.c
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@ -2262,7 +2262,8 @@ static bool client_has_state(struct nfs4_client *clp)
* Note clp->cl_openowners check isn't quite right: there's no
* need to count owners without stateid's.
*
* Also note we should probably be using this in 4.0 case too.
* Also note in 4.0 case should also be checking for openowners
* kept around just for close handling.
*/
return !list_empty(&clp->cl_openowners)
#ifdef CONFIG_NFSD_PNFS
@ -3049,7 +3050,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
/* Cases below refer to rfc 3530 section 14.2.33: */
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
if (conf) {
if (conf && client_has_state(conf)) {
/* case 0: */
status = nfserr_clid_inuse;
if (clp_used_exchangeid(conf))
@ -3136,6 +3137,11 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
} else { /* case 3: normal case; new or rebooted client */
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = nfserr_clid_inuse;
if (client_has_state(old)
&& !same_creds(&unconf->cl_cred,
&old->cl_cred))
goto out;
status = mark_client_expired_locked(old);
if (status) {
old = NULL;