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>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7e817d13cd8232e2e957b5ee48c68faed4dc8b43..c470cb78c6c15fbb19f7e64642dcb31f00e91d9f 100644 (file)
--- 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);