NFSD: Create PF_INET6 listener in write_ports

Try to create a PF_INET6 listener for NFSD, if IPv6 is enabled in the
kernel.

Make sure nfsd_serv's reference count is decreased if
__write_ports_addxprt() failed to create a listener.  See
__write_ports_addfd().

Our current plan is to rely on rpc.nfsd to create appropriate IPv6
listeners when server-side NFS/IPv6 support is desired.  Legacy
behavior, via the write_threads or write_svc kernel APIs, will remain
the same -- only IPv4 listeners are created.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[bfields@citi.umich.edu: Move error-handling code to end]
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f43ecd61fa8135023343069968a2235b334e4490..0f0e77f2012f64951d9b8c1fc54f19156fab6f62 100644 (file)
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -988,6 +988,7 @@ static ssize_t __write_ports_delfd(char *buf)
 static ssize_t __write_ports_addxprt(char *buf)
 {
        char transport[16];
+       struct svc_xprt *xprt;
        int port, err;
 
        if (sscanf(buf, "%15s %4u", transport, &port) != 2)
@@ -1003,8 +1004,23 @@ static ssize_t __write_ports_addxprt(char *buf)
        err = svc_create_xprt(nfsd_serv, transport,
                                PF_INET, port, SVC_SOCK_ANONYMOUS);
        if (err < 0)
-               return err;
+               goto out_err;
+
+       err = svc_create_xprt(nfsd_serv, transport,
+                               PF_INET6, port, SVC_SOCK_ANONYMOUS);
+       if (err < 0 && err != -EAFNOSUPPORT)
+               goto out_close;
        return 0;
+out_close:
+       xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
+       if (xprt != NULL) {
+               svc_close_xprt(xprt);
+               svc_xprt_put(xprt);
+       }
+out_err:
+       /* Decrease the count, but don't shut down the service */
+       nfsd_serv->sv_nrthreads--;
+       return err;
 }
 
 /*