NFSD: Forget state for a specific client

Write the client's ip address to any state file and all appropriate
state for that client will be forgotten.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9fb8e52580f3..eff734033437 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4763,6 +4763,21 @@ u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
         return count;
 }
 
+struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
+{
+        struct nfs4_client *clp;
+        struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, nfsd_net_id);
+
+        if (!nfsd_netns_ready(nn))
+                return NULL;
+
+        list_for_each_entry(clp, &nn->client_lru, cl_lru) {
+                if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
+                        return clp;
+        }
+        return NULL;
+}
+
 #endif /* CONFIG_NFSD_FAULT_INJECTION */
 
 /* initialization to perform at module load time: */