If there are more non-courteous clients than the calculated limit, we
should fail the request rather than report a soft failure and
encouraging the client to retry indefinitely.
If there a courteous clients which push us over the limit, then expedite
their removal.
This is not known to have caused a problem is production use, but
testing of lots of clients reports repeated NFS4ERR_DELAY responses
which doesn't seem helpful.
Also remove an outdated comment - we do use a slab cache.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
fs/nfsd/nfs4state.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a20c2c9d7d45..88936f3189e1 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2212,21 +2212,20 @@ STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
return 1;
}
-/*
- * XXX Should we use a slab cache ?
- * This type of memory management is somewhat inefficient, but we use it
- * anyway since SETCLIENTID is not a common operation.
- */
static struct nfs4_client *alloc_client(struct xdr_netobj name,
struct nfsd_net *nn)
{
struct nfs4_client *clp;
int i;
- if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
+ if (atomic_read(&nn->nfs4_client_count) -
+ atomic_read(&nn->nfsd_courtesy_clients) >= nn->nfs4_max_clients)
+ return ERR_PTR(-EREMOTEIO);
+
+ if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients &&
+ atomic_read(&nn->nfsd_courtesy_clients) > 0)
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
- return NULL;
- }
+
clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
if (clp == NULL)
return NULL;
@@ -3115,8 +3114,8 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
struct dentry *dentries[ARRAY_SIZE(client_files)];
clp = alloc_client(name, nn);
- if (clp == NULL)
- return NULL;
+ if (IS_ERR_OR_NULL(clp))
+ return clp;
ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
if (ret) {
@@ -3498,6 +3497,8 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
new = create_client(exid->clname, rqstp, &verf);
if (new == NULL)
return nfserr_jukebox;
+ if (IS_ERR(new))
+ return nfserr_resource;
status = copy_impl_id(new, exid);
if (status)
goto out_nolock;
@@ -4416,6 +4417,8 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
new = create_client(clname, rqstp, &clverifier);
if (new == NULL)
return nfserr_jukebox;
+ if (IS_ERR(new))
+ return nfserr_resource;
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
if (conf && client_has_state(conf)) {
--
2.44.0
