nfs41: create NFSv3 DS connection if specified
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <Thomas.Haynes@primarydata.com>
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index ad211a4..23c851d 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -10,6 +10,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/sunrpc/addr.h>
+#include <linux/module.h>
#include "nfs4session.h"
#include "internal.h"
@@ -550,7 +551,75 @@
wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
}
-static int _nfs4_pnfs_ds_connect(struct nfs_server *mds_srv,
+static struct nfs_client *(*get_v3_ds_connect)(
+ struct nfs_client *mds_clp,
+ const struct sockaddr *ds_addr,
+ int ds_addrlen,
+ int ds_proto,
+ unsigned int ds_timeo,
+ unsigned int ds_retrans,
+ rpc_authflavor_t au_flavor);
+
+static bool load_v3_ds_connect(void)
+{
+ if (!get_v3_ds_connect) {
+ get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
+ WARN_ON_ONCE(!get_v3_ds_connect);
+ }
+
+ return(get_v3_ds_connect != NULL);
+}
+
+void __exit nfs4_pnfs_v3_ds_connect_unload(void)
+{
+ if (get_v3_ds_connect) {
+ symbol_put(nfs3_set_ds_client);
+ get_v3_ds_connect = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload);
+
+static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
+ struct nfs4_pnfs_ds *ds,
+ unsigned int timeo,
+ unsigned int retrans,
+ rpc_authflavor_t au_flavor)
+{
+ struct nfs_client *clp = ERR_PTR(-EIO);
+ struct nfs4_pnfs_ds_addr *da;
+ int status = 0;
+
+ dprintk("--> %s DS %s au_flavor %d\n", __func__,
+ ds->ds_remotestr, au_flavor);
+
+ if (!load_v3_ds_connect())
+ goto out;
+
+ list_for_each_entry(da, &ds->ds_addrs, da_node) {
+ dprintk("%s: DS %s: trying address %s\n",
+ __func__, ds->ds_remotestr, da->da_remotestr);
+
+ clp = get_v3_ds_connect(mds_srv->nfs_client,
+ (struct sockaddr *)&da->da_addr,
+ da->da_addrlen, IPPROTO_TCP,
+ timeo, retrans, au_flavor);
+ if (!IS_ERR(clp))
+ break;
+ }
+
+ if (IS_ERR(clp)) {
+ status = PTR_ERR(clp);
+ goto out;
+ }
+
+ smp_wmb();
+ ds->ds_clp = clp;
+ dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
+out:
+ return status;
+}
+
+static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
struct nfs4_pnfs_ds *ds,
unsigned int timeo,
unsigned int retrans,
@@ -562,7 +631,7 @@
int status = 0;
dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
- mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor);
+ au_flavor);
list_for_each_entry(da, &ds->ds_addrs, da_node) {
dprintk("%s: DS %s: trying address %s\n",
@@ -609,8 +678,19 @@
if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
int err = 0;
- err = _nfs4_pnfs_ds_connect(mds_srv, ds, timeo, retrans,
- minor_version, au_flavor);
+ if (version == 3) {
+ err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
+ retrans, au_flavor);
+ } else if (version == 4) {
+ err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
+ retrans, minor_version,
+ au_flavor);
+ } else {
+ dprintk("%s: unsupported DS version %d\n", __func__,
+ version);
+ err = -EPROTONOSUPPORT;
+ }
+
if (err)
nfs4_mark_deviceid_unavailable(devid);
nfs4_clear_ds_conn_bit(ds);