NFS: Use kernel DNS resolver [ver #2]

Use the kernel DNS resolver to translate hostnames to IP addresses.  Create a
new config option to choose between the legacy DNS resolver and the new
resolver.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index cc1bb33b59b8..c5bbdca13ac2 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -100,3 +100,19 @@ config NFS_FSCACHE
         help
           Say Y here if you want NFS data to be cached locally on disc through
           the general filesystem cache manager
+
+config NFS_USE_LEGACY_DNS
+        bool "Use the legacy NFS DNS resolver"
+        depends on NFS_V4
+        help
+          The kernel now provides a method for translating a host name into an
+          IP address.  Select Y here if you would rather use your own DNS
+          resolver script.
+
+          If unsure, say N
+
+config NFS_USE_KERNEL_DNS
+        bool
+        depends on NFS_V4 && !NFS_USE_LEGACY_DNS
+        select DNS_RESOLVER
+        default y