nfsd4: track backchannel connections

We need to keep track of which connections are available for use with
the backchannel, which for the forechannel, and which for both.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 7 insertions, 4 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7e817d13cd82..c470cb78c6c1 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -644,7 +644,7 @@ static void nfsd4_conn_lost(struct svc_xpt_user *u)
         spin_unlock(&clp->cl_lock);
 }
 
-static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp)
+static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
 {
         struct nfsd4_conn *conn;
 
@@ -653,7 +653,7 @@ static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp)
                 return NULL;
         svc_xprt_get(rqstp->rq_xprt);
         conn->cn_xprt = rqstp->rq_xprt;
-        conn->cn_flags = NFS4_CDFC4_FORE;
+        conn->cn_flags = flags;
         INIT_LIST_HEAD(&conn->cn_xpt_user.list);
         return conn;
 }
@@ -682,8 +682,11 @@ static void nfsd4_register_conn(struct nfsd4_conn *conn)
 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses)
 {
         struct nfsd4_conn *conn;
+        u32 flags = NFS4_CDFC4_FORE;
 
-        conn = alloc_conn(rqstp);
+        if (ses->se_flags & SESSION4_BACK_CHAN)
+                flags |= NFS4_CDFC4_BACK;
+        conn = alloc_conn(rqstp, flags);
         if (!conn)
                 return nfserr_jukebox;
         nfsd4_hash_conn(conn, ses);
@@ -1640,7 +1643,7 @@ static void nfsd4_sequence_check_conn(struct svc_rqst *rqstp, struct nfsd4_sessi
         if (c)
                 return;
 
-        new = alloc_conn(rqstp);
+        new = alloc_conn(rqstp, NFS4_CDFC4_FORE);
 
         spin_lock(&clp->cl_lock);
         c = __nfsd4_find_conn(rqstp, ses);