NFSv4.1: add MDS mount DS only check
The DS only role cannot be used to mount.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 280d41f6..d5c5bdf 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1453,6 +1453,10 @@
BUG_ON(!server->nfs_client->rpc_ops);
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
+ /* data servers support only a subset of NFSv4.1 */
+ if (is_ds_only_client(server->nfs_client))
+ return -EPROTONOSUPPORT;
+
fattr = nfs_alloc_fattr();
if (fattr == NULL)
return -ENOMEM;
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 1be36cf..d4cfacc 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -259,6 +259,13 @@
extern int nfs4_init_session(struct nfs_server *server);
extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
struct nfs_fsinfo *fsinfo);
+
+static inline bool
+is_ds_only_client(struct nfs_client *clp)
+{
+ return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
+ EXCHGID4_FLAG_USE_PNFS_DS;
+}
#else /* CONFIG_NFS_v4_1 */
static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
{
@@ -276,6 +283,12 @@
{
return 0;
}
+
+static inline bool
+is_ds_only_client(struct nfs_client *clp)
+{
+ return false;
+}
#endif /* CONFIG_NFS_V4_1 */
extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
