NFSv4.1: Exchange ID must use GFP_NOFS allocation mode

Exchange ID can be called in a lease reclaim situation, so it
will deadlock if it then tries to write out dirty NFS pages.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index e8988c0..f8817e8 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5192,20 +5192,20 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
                                clp->cl_rpcclient->cl_auth->au_flavor);
 
        res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
-                                       GFP_KERNEL);
+                                       GFP_NOFS);
        if (unlikely(res.server_owner == NULL)) {
                status = -ENOMEM;
                goto out;
        }
 
        res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
-                                       GFP_KERNEL);
+                                       GFP_NOFS);
        if (unlikely(res.server_scope == NULL)) {
                status = -ENOMEM;
                goto out_server_owner;
        }
 
-       res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
+       res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
        if (unlikely(res.impl_id == NULL)) {
                status = -ENOMEM;
                goto out_server_scope;