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Commit 94de8b27 authored by Andy Adamson's avatar Andy Adamson Committed by Trond Myklebust
Browse files

NFSv4.1: add MDS mount DS only check 



The DS only role cannot be used to mount.

Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent d6fb79d4

fs/nfs/client.c

+4 −0
Original line number Diff line number Diff line
@@ -1453,6 +1453,10 @@ static int nfs4_server_common_setup(struct nfs_server *server, 
	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;

fs/nfs/nfs4_fs.h

+13 −0
Original line number Diff line number Diff line
@@ -259,6 +259,13 @@ extern int nfs4_proc_destroy_session(struct nfs4_session *); 
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 @@ static inline int nfs4_init_session(struct nfs_server *server) 
{

	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[];