> On Apr 27, 2016, at 11:36 AM, andros@xxxxxxxxxx wrote:
>
> From: Andy Adamson <andros@xxxxxxxxxx>
>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> ---
> fs/nfs/super.c | 24 ++++++++++++++++++++++++
> net/sunrpc/xprtmultipath.c | 1 +
> 2 files changed, 25 insertions(+)
>
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index 70a4fda..1dc1e18 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -605,8 +605,32 @@ static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
> int showdefaults)
> {
> struct nfs_client *clp = nfss->nfs_client;
> + struct rpc_clnt *clnt = clp->cl_rpcclient;
> + struct rpc_xprt_switch *xps;
> + struct rpc_xprt *pos;
> + unsigned int nxprts;
>
> seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
> + rcu_read_lock();
> + xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
> + pos = xprt_iter_xprt(&clnt->cl_xpi);
> + if (xps == NULL || pos == NULL)
> + return;
^^ you need an rcu_read_unlock() before the return.
-dros
> + nxprts = xps->xps_nxprts;
> + list_for_each_entry_rcu(pos, &xps->xps_xprt_list, xprt_switch) {
> + if (nxprts == 0)
> + break;
> + if (pos->address_strings[RPC_DISPLAY_ADDR] == NULL)
> + break;
> + /* Do not display mount xprt as a multiaddr */
> + if (pos == rcu_access_pointer(clp->cl_rpcclient->cl_xprt))
> + continue;
> + seq_printf(m, ",multiaddr=%s",
> + pos->address_strings[RPC_DISPLAY_ADDR]);
> + nxprts--;
> + }
> + rcu_read_unlock();
> + xprt_switch_put(xps);
> }
> #else
> static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
> diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c
> index 360f64c..708c22a 100644
> --- a/net/sunrpc/xprtmultipath.c
> +++ b/net/sunrpc/xprtmultipath.c
> @@ -403,6 +403,7 @@ struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi)
> WARN_ON_ONCE(!rcu_read_lock_held());
> return xprt_iter_ops(xpi)->xpi_xprt(xpi);
> }
> +EXPORT_SYMBOL_GPL(xprt_iter_xprt);
>
> static
> struct rpc_xprt *xprt_iter_get_helper(struct rpc_xprt_iter *xpi,
> --
> 1.8.3.1
>
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