NFS: Use the DNS resolver in the mount code.

In the referral code, use it to look up the new server's ip address if the
fs_locations attribute contains a hostname.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index ef22ee8..2636c26 100644 (file)
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -17,6 +17,7 @@
 #include <linux/inet.h>
 #include "internal.h"
 #include "nfs4_fs.h"
+#include "dns_resolve.h"
 
 #define NFSDBG_FACILITY                NFSDBG_VFS
 
@@ -95,6 +96,20 @@ static int nfs4_validate_fspath(const struct vfsmount *mnt_parent,
        return 0;
 }
 
+static size_t nfs_parse_server_name(char *string, size_t len,
+               struct sockaddr *sa, size_t salen)
+{
+       ssize_t ret;
+
+       ret = rpc_pton(string, len, sa, salen);
+       if (ret == 0) {
+               ret = nfs_dns_resolve_name(string, len, sa, salen);
+               if (ret < 0)
+                       ret = 0;
+       }
+       return ret;
+}
+
 static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                                     char *page, char *page2,
                                     const struct nfs4_fs_location *location)
@@ -121,7 +136,8 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
 
                if (memchr(buf->data, IPV6_SCOPE_DELIMITER, buf->len))
                        continue;
-               mountdata->addrlen = rpc_pton(buf->data, buf->len,
+               mountdata->addrlen = nfs_parse_server_name(buf->data,
+                               buf->len,
                                mountdata->addr, mountdata->addrlen);
                if (mountdata->addrlen == 0)
                        continue;