Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:23308 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932858Ab1EaWtS (ORCPT ); Tue, 31 May 2011 18:49:18 -0400 From: Weston Andros Adamson To: trond@netapp.com Cc: linux-nfs@vger.kernel.org, Weston Andros Adamson Subject: [PATCH 3/3] NFS: pnfs: loop over multipath addrs on connect Date: Tue, 31 May 2011 18:48:58 -0400 Message-Id: <1306882138-6528-4-git-send-email-dros@netapp.com> In-Reply-To: <1306882138-6528-1-git-send-email-dros@netapp.com> References: <1306882138-6528-1-git-send-email-dros@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 Don't just use the first addr in the multipath list - instead, loop over addresses when calling nfs4_set_ds_client() (which calls connect) until it is successful. Although this is not real multipath support, it's a quick fix to handle when an MDS sends a list of addresses for a DS and some of the addr families are unsupported or misconfigured (like no routable ipv6 addr assigned). This will attempt all paths to the DS before giving up, instead of immediately falling back to the MDS. As before, an error encountered after a successful connect() will cause all i/o to fall back to the MDS. Signed-off-by: Weston Andros Adamson --- fs/nfs/nfs4filelayoutdev.c | 14 +++++++++----- 1 files changed, 9 insertions(+), 5 deletions(-) diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c index f26c1cf..aff4d9a 100644 --- a/fs/nfs/nfs4filelayoutdev.c +++ b/fs/nfs/nfs4filelayoutdev.c @@ -169,7 +169,7 @@ _data_server_match_all_addrs_locked(struct list_head *dsaddrs1, static int nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) { - struct nfs_client *clp; + struct nfs_client *clp = ERR_PTR(-EIO); struct nfs4_pnfs_ds_addr *da; int status = 0; @@ -178,13 +178,17 @@ nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) BUG_ON(list_empty(&ds->ds_addrs)); - da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); - dprintk("%s: using the first address for DS %s: %s\n", - __func__, ds->ds_remotestr, da->da_remotestr); + list_for_each_entry(da, &ds->ds_addrs, da_node) { + dprintk("%s: DS %s: trying address %s\n", + __func__, ds->ds_remotestr, da->da_remotestr); - clp = nfs4_set_ds_client(mds_srv->nfs_client, + clp = nfs4_set_ds_client(mds_srv->nfs_client, (struct sockaddr *)&da->da_addr, da->da_addrlen, IPPROTO_TCP); + if (!IS_ERR(clp)) + break; + } + if (IS_ERR(clp)) { status = PTR_ERR(clp); goto out; -- 1.7.5.2