2 files changed, 43 insertions, 0 deletions

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index e4d6a8348adf..0207758de44a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -30,6 +30,12 @@ struct nfs_clone_mount {
 };
 
 /*
+ * Note: RFC 1813 doesn't limit the number of auth flavors that
+ * a server can return, so make something up.
+ */
+#define NFS_MAX_SECFLAVORS      (12)
+
+/*
  * In-kernel mount arguments
  */
 struct nfs_parsed_mount_data {
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index dd8c6f448eaa..ed0a27ed538d 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -33,6 +33,7 @@
 #define MNT_fhs_status_sz       (1)
 #define MNT_fhandle_sz          XDR_QUADLEN(NFS2_FHSIZE)
 #define MNT_fhandle3_sz         (1 + XDR_QUADLEN(NFS3_FHSIZE))
+#define MNT_authflav3_sz        (1 + NFS_MAX_SECFLAVORS)
 
 /*
  * XDR argument and result sizes
@@ -122,6 +123,8 @@ static struct {
 struct mountres {
         int errno;
         struct nfs_fh *fh;
+        unsigned int *auth_count;
+        rpc_authflavor_t *auth_flavors;
 };
 
 struct mnt_fhstatus {
@@ -334,6 +337,40 @@ static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
         return 0;
 }
 
+static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
+{
+        rpc_authflavor_t *flavors = res->auth_flavors;
+        unsigned int *count = res->auth_count;
+        u32 entries, i;
+        __be32 *p;
+
+        if (*count == 0)
+                return 0;
+
+        p = xdr_inline_decode(xdr, sizeof(entries));
+        if (unlikely(p == NULL))
+                return -EIO;
+        entries = ntohl(*p);
+        dprintk("NFS: received %u auth flavors\n", entries);
+        if (entries > NFS_MAX_SECFLAVORS)
+                entries = NFS_MAX_SECFLAVORS;
+
+        p = xdr_inline_decode(xdr, sizeof(u32) * entries);
+        if (unlikely(p == NULL))
+                return -EIO;
+
+        if (entries > *count)
+                entries = *count;
+
+        for (i = 0; i < entries; i++) {
+                flavors[i] = ntohl(*p++);
+                dprintk("NFS:\tflavor %u: %d\n", i, flavors[i]);
+        }
+        *count = i;
+
+        return 0;
+}
+
 static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
                                 struct mnt_fhstatus *res)
 {