From: Andy Adamson <andros@xxxxxxxxxx>
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
---
fs/nfs/nfs4_fs.h | 2 ++
fs/nfs/nfs4client.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 4be567a..eb315e1 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -277,6 +277,8 @@ extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
struct nfs_fsinfo *fsinfo);
extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
bool sync);
+extern int nfs4_detect_session_trunking(struct nfs_client *clp,
+ struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
static inline bool
is_ds_only_client(struct nfs_client *clp)
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index f356d50..37a9416 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -595,6 +595,99 @@ out_major_mismatch:
return false;
}
+/*
+ * Returns true if server minor ids match
+ */
+static bool
+nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1,
+ struct nfs41_server_owner *o2)
+{
+ /* Check eir_server_owner so_minor_id */
+ if (o1->minor_id != o2->minor_id)
+ goto out_minor_mismatch;
+
+ dprintk("NFS: --> %s server owner minor IDs s match\n", __func__);
+ return true;
+
+out_minor_mismatch:
+ dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__);
+ return false;
+}
+
+/*
+ * Returns true if the server scopes match
+ */
+static bool
+nfs4_check_server_scope(struct nfs41_server_scope *s1,
+ struct nfs41_server_scope *s2)
+{
+ if (s1->server_scope_sz != s2->server_scope_sz)
+ goto out_scope_mismatch;
+ if (memcmp(s1->server_scope, s2->server_scope,
+ s1->server_scope_sz) != 0)
+ goto out_scope_mismatch;
+
+ dprintk("NFS: --> %s server scopes match\n", __func__);
+ return true;
+
+out_scope_mismatch:
+ dprintk("NFS: --> %s server scopes do not match\n",
+ __func__);
+ return false;
+}
+
+/**
+ * nfs4_detect_session_trunking - Checks for ssession trunking called
+ * after a successuful EXCHANGE_ID testing a multi-addr connection to be
+ * potentially added as a session trunk
+ *
+ * @clp: original mount nfs_client
+ * @res: result structure from an exchange_id using the original mount
+ * nfs_client with a new multi_addr transport
+ *
+ * Returns zero on success, otherwise -EINVAL
+ *
+ * Note: since the exchange_id for the new multi_addr transport uses the
+ * same nfs_client from the original mount, the cl_owner_id is reused,
+ * so eir_clientowner is the same.
+ */
+int nfs4_detect_session_trunking(struct nfs_client *clp,
+ struct nfs41_exchange_id_res *res,
+ struct rpc_xprt *xprt)
+{
+ int status = -EINVAL;
+ /* Check eir_clientid */
+ if (!nfs4_match_clientids(clp->cl_clientid, res->clientid))
+ goto out;
+
+ /* Check eir_server_owner so_major_id */
+ if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
+ res->server_owner))
+ goto out;
+
+ /* Check eir_server_owner so_minor_id */
+ if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner,
+ res->server_owner))
+ goto out;
+
+ /* Check eir_server_scope */
+ if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
+ goto out;
+
+ status = 0;
+out:
+ if (status)
+ pr_info("NFS: %s: Session trunking failed for %s status %d\n",
+ clp->cl_hostname,
+ xprt->address_strings[RPC_DISPLAY_ADDR], status);
+ else
+ pr_info("NFS: %s: Session trunking succeeded for %s\n",
+ clp->cl_hostname,
+ xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+ return status;
+}
+
/**
* nfs41_walk_client_list - Find nfs_client that matches a client/server owner
*
--
1.8.3.1
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