NFS: add support for multiple sec= mount options
This patch adds support for multiple security options which can be
specified using a colon-delimited list of security flavors (the same
syntax as nfsd's exports file).
This is useful, for instance, when NFSv4.x mounts cross SECINFO
boundaries. With this patch a user can use "sec=krb5i,krb5p"
to mount a remote filesystem using krb5i, but can still cross
into krb5p-only exports.
New mounts will try all security options before failing. NFSv4.x
SECINFO results will be compared against the sec= flavors to
find the first flavor in both lists or if no match is found will
return -EPERM.
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index f6cc77c..b4a160a 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -964,6 +964,9 @@
server->options = data->options;
server->auth_info = data->auth_info;
+ /* Use the first specified auth flavor. If this flavor isn't
+ * allowed by the server, use the SECINFO path to try the
+ * other specified flavors */
if (data->auth_info.flavor_len >= 1)
data->selected_flavor = data->auth_info.flavors[0];
else