nfs4: set source address when callback is generated

when callback is generated in NFSv4 server, it doesn't set the source
address. When an alias IP is utilized on NFSv4 server and suppose the
client is accessing via that alias IP (e.g. eth0:0), the client invokes
the callback to the IP address that is set on the original device (e.g.
eth0). This behavior results in timeout of xprt.
The patch sets the IP address that the client should invoke callback to.

Signed-off-by: Takuma Umeya <tumeya@redhat.com>
[bfields@redhat.com: Simplify gen_callback arguments, use helper function]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 84b230217b1b..cf6dc83fd545 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -96,6 +96,7 @@ struct nfs4_delegation {
 struct nfs4_cb_conn {
         /* SETCLIENTID info */
         struct sockaddr_storage cb_addr;
+        struct sockaddr_storage cb_saddr;
         size_t                  cb_addrlen;
         u32                     cb_prog; /* used only in 4.0 case;
                                             per-session otherwise */