nfs41: minorversion support for nfs4_{init,destroy}_callback

move nfs4_init_callback into nfs4_init_client_minor_version
and nfs4_destroy_callback into nfs4_clear_client_minor_version

as these need to happen also when auto-negotiating the minorversion
once the callback service for nfs41 becomes different than for nfs4.0

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: Fix checkpatch warning]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Type check arguments of nfs_callback_up]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: Backchannel: Remove FIXME comment]
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index a886e69..4b1313e 100644 (file)
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -59,7 +59,7 @@ module_param_call(callback_tcpport, param_set_port, param_get_int,
  * This is the callback kernel thread.
  */
 static int
-nfs_callback_svc(void *vrqstp)
+nfs4_callback_svc(void *vrqstp)
 {
        int err, preverr = 0;
        struct svc_rqst *rqstp = vrqstp;
@@ -97,20 +97,12 @@ nfs_callback_svc(void *vrqstp)
 }
 
 /*
- * Bring up the callback thread if it is not already up.
+ * Prepare to bring up the NFSv4 callback service
  */
-int nfs_callback_up(void)
+struct svc_rqst *
+nfs4_callback_up(struct svc_serv *serv)
 {
-       struct svc_serv *serv = NULL;
-       int ret = 0;
-
-       mutex_lock(&nfs_callback_mutex);
-       if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
-               goto out;
-       serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
-       ret = -ENOMEM;
-       if (!serv)
-               goto out_err;
+       int ret;
 
        ret = svc_create_xprt(serv, "tcp", PF_INET,
                                nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
@@ -131,18 +123,53 @@ int nfs_callback_up(void)
                goto out_err;
 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 
-       nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
-       if (IS_ERR(nfs_callback_info.rqst)) {
-               ret = PTR_ERR(nfs_callback_info.rqst);
-               nfs_callback_info.rqst = NULL;
+       return svc_prepare_thread(serv, &serv->sv_pools[0]);
+
+out_err:
+       if (ret == 0)
+               ret = -ENOMEM;
+       return ERR_PTR(ret);
+}
+
+/*
+ * Bring up the callback thread if it is not already up.
+ */
+int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
+{
+       struct svc_serv *serv = NULL;
+       struct svc_rqst *rqstp;
+       int (*callback_svc)(void *vrqstp);
+       char svc_name[12];
+       int ret = 0;
+
+       mutex_lock(&nfs_callback_mutex);
+       if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
+               goto out;
+       serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
+       if (!serv) {
+               ret = -ENOMEM;
+               goto out_err;
+       }
+
+       if (!minorversion) {
+               rqstp = nfs4_callback_up(serv);
+               callback_svc = nfs4_callback_svc;
+       } else {
+               BUG();  /* for now */
+       }
+
+       if (IS_ERR(rqstp)) {
+               ret = PTR_ERR(rqstp);
                goto out_err;
        }
 
        svc_sock_update_bufs(serv);
 
-       nfs_callback_info.task = kthread_run(nfs_callback_svc,
+       sprintf(svc_name, "nfsv4.%u-svc", minorversion);
+       nfs_callback_info.rqst = rqstp;
+       nfs_callback_info.task = kthread_run(callback_svc,
                                             nfs_callback_info.rqst,
-                                            "nfsv4-svc");
+                                            svc_name);
        if (IS_ERR(nfs_callback_info.task)) {
                ret = PTR_ERR(nfs_callback_info.task);
                svc_exit_thread(nfs_callback_info.rqst);

diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index e110e28..9b907f4 100644 (file)
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -63,7 +63,7 @@ extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getat
 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
 
 #ifdef CONFIG_NFS_V4
-extern int nfs_callback_up(void);
+extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 extern void nfs_callback_down(void);
 #else
 #define nfs_callback_up()      (0)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d9657d4..df2b40d 100644 (file)
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -47,9 +47,6 @@
 #include "internal.h"
 #include "fscache.h"
 
-static int nfs4_init_callback(struct nfs_client *);
-static void nfs4_destroy_callback(struct nfs_client *);
-
 #define NFSDBG_FACILITY                NFSDBG_CLIENT
 
 static DEFINE_SPINLOCK(nfs_client_lock);
@@ -124,9 +121,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
 
        clp->rpc_ops = cl_init->rpc_ops;
 
-       if (nfs4_init_callback(clp) < 0)
-               goto error_2;
-
        atomic_set(&clp->cl_count, 1);
        clp->cl_cons_state = NFS_CS_INITING;
 
@@ -136,7 +130,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
        if (cl_init->hostname) {
                clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
                if (!clp->cl_hostname)
-                       goto error_3;
+                       goto error_cleanup;
        }
 
        INIT_LIST_HEAD(&clp->cl_superblocks);
@@ -161,9 +155,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
 
        return clp;
 
-error_3:
-       nfs4_destroy_callback(clp);
-error_2:
+error_cleanup:
        kfree(clp);
 error_0:
        return NULL;
@@ -207,6 +199,8 @@ static void nfs4_clear_client_minor_version(struct nfs_client *clp)
 
        clp->cl_call_sync = _nfs4_call_sync;
 #endif /* CONFIG_NFS_V4_1 */
+
+       nfs4_destroy_callback(clp);
 }
 
 /*
@@ -225,8 +219,6 @@ static void nfs_free_client(struct nfs_client *clp)
        if (!IS_ERR(clp->cl_rpcclient))
                rpc_shutdown_client(clp->cl_rpcclient);
 
-       nfs4_destroy_callback(clp);
-
        if (clp->cl_machine_cred != NULL)
                put_rpccred(clp->cl_machine_cred);
 
@@ -1104,7 +1096,8 @@ static int nfs4_init_callback(struct nfs_client *clp)
        int error;
 
        if (clp->rpc_ops->version == 4) {
-               error = nfs_callback_up();
+               error = nfs_callback_up(clp->cl_minorversion,
+                                       clp->cl_rpcclient->cl_xprt);
                if (error < 0) {
                        dprintk("%s: failed to start callback. Error = %d\n",
                                __func__, error);
@@ -1139,7 +1132,7 @@ static int nfs4_init_client_minor_version(struct nfs_client *clp)
        }
 #endif /* CONFIG_NFS_V4_1 */
 
-       return 0;
+       return nfs4_init_callback(clp);
 }
 
 /*