NFS: Retry mounting NFSROOT

[pandora-kernel.git] / init / do_mounts.c

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 0f6e1d9..db6e5ee 100644 (file)
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -398,15 +398,42 @@ out:
 }
  
 #ifdef CONFIG_ROOT_NFS
+
+#define NFSROOT_TIMEOUT_MIN    5
+#define NFSROOT_TIMEOUT_MAX    30
+#define NFSROOT_RETRY_MAX      5
+
 static int __init mount_nfs_root(void)
 {
        char *root_dev, *root_data;
+       unsigned int timeout;
+       int try, err;
 
-       if (nfs_root_data(&root_dev, &root_data) != 0)
-               return 0;
-       if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
+       err = nfs_root_data(&root_dev, &root_data);
+       if (err != 0)
                return 0;
-       return 1;
+
+       /*
+        * The server or network may not be ready, so try several
+        * times.  Stop after a few tries in case the client wants
+        * to fall back to other boot methods.
+        */
+       timeout = NFSROOT_TIMEOUT_MIN;
+       for (try = 1; ; try++) {
+               err = do_mount_root(root_dev, "nfs",
+                                       root_mountflags, root_data);
+               if (err == 0)
+                       return 1;
+               if (try > NFSROOT_RETRY_MAX)
+                       break;
+
+               /* Wait, in case the server refused us immediately */
+               ssleep(timeout);
+               timeout <<= 1;
+               if (timeout > NFSROOT_TIMEOUT_MAX)
+                       timeout = NFSROOT_TIMEOUT_MAX;
+       }
+       return 0;
 }
 #endif