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: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/pnfs_nfs.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index 81ac6480f9e7..4aaed890048f 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -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);
- clp = get_v3_ds_connect(mds_srv->nfs_client,
+ 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)) {
--
2.5.0
--
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