NFS: use scope from exchange_id to skip reclaim

[linux-imx.git] / fs / nfs / nfs4proc.c

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5879b23e0c99a1b0dfcff8c072bb0432ade497bf..5f4912f72282ec24771e6a92c5ea68423e723be2 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4781,6 +4781,16 @@ out_inval:
        return -NFS4ERR_INVAL;
 }
 
+static bool
+nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
+{
+       if (a->server_scope_sz == b->server_scope_sz &&
+           memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
+               return true;
+
+       return false;
+}
+
 /*
  * nfs4_proc_exchange_id()
  *
@@ -4823,9 +4833,31 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
                                init_utsname()->domainname,
                                clp->cl_rpcclient->cl_auth->au_flavor);
 
+       res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
+       if (unlikely(!res.server_scope))
+               return -ENOMEM;
+
        status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
        if (!status)
                status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
+
+       if (!status) {
+               if (clp->server_scope &&
+                   !nfs41_same_server_scope(clp->server_scope,
+                                            res.server_scope)) {
+                       dprintk("%s: server_scope mismatch detected\n",
+                               __func__);
+                       set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
+                       kfree(clp->server_scope);
+                       clp->server_scope = NULL;
+               }
+
+               if (!clp->server_scope)
+                       clp->server_scope = res.server_scope;
+               else
+                       kfree(res.server_scope);
+       }
+
        dprintk("<-- %s status= %d\n", __func__, status);
        return status;
 }