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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>
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2 changed files with 17 additions and 0 deletions
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@ -1453,6 +1453,10 @@ static int nfs4_server_common_setup(struct nfs_server *server,
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BUG_ON(!server->nfs_client->rpc_ops);
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BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
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/* data servers support only a subset of NFSv4.1 */
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if (is_ds_only_client(server->nfs_client))
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return -EPROTONOSUPPORT;
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fattr = nfs_alloc_fattr();
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if (fattr == NULL)
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return -ENOMEM;
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@ -259,6 +259,13 @@ extern int nfs4_proc_destroy_session(struct nfs4_session *);
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extern int nfs4_init_session(struct nfs_server *server);
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extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
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struct nfs_fsinfo *fsinfo);
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static inline bool
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is_ds_only_client(struct nfs_client *clp)
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{
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return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
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EXCHGID4_FLAG_USE_PNFS_DS;
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}
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#else /* CONFIG_NFS_v4_1 */
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static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
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{
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@ -276,6 +283,12 @@ static inline int nfs4_init_session(struct nfs_server *server)
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{
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return 0;
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}
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static inline bool
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is_ds_only_client(struct nfs_client *clp)
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{
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return false;
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}
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#endif /* CONFIG_NFS_V4_1 */
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extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
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