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Commit fc821d59 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

pnfs/NFSv4.1: Add multipath capabilities to pNFS flexfiles servers over NFSv3 



This adds multipathing to pNFS over NFSv3 as described in the flexfiles
draft spec.
Ideally, we'd like to do the same for pNFS files, but the NFSv4.1 protocol
requires a call to EXCHANGE_ID in order to test that the connection can do
session trunking.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 7f554890

fs/nfs/pnfs_nfs.c

+13 −3
Original line number Diff line number Diff line
@@ -606,12 +606,22 @@ static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 
		dprintk("%s: DS %s: trying address %s\n",

			__func__, ds->ds_remotestr, da->da_remotestr);



		if (!IS_ERR(clp)) {

			struct xprt_create xprt_args = {

				.ident = XPRT_TRANSPORT_TCP,

				.net = clp->cl_net,

				.dstaddr = (struct sockaddr *)&da->da_addr,

				.addrlen = da->da_addrlen,

				.servername = clp->cl_hostname,

			};

			/* Add this address as an alias */

			rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,

					rpc_clnt_test_and_add_xprt, NULL);

		} else

			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)) {