Merge branch 'nfs-for-3.3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

[firefly-linux-kernel-4.4.55.git] / init / do_mounts.c

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 0f6e1d985a3b2851c662337c1671b57cc4270f0a..2974c8b3b351b4a15b38acca4478e4032fece9fa 100644 (file)
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -325,17 +325,19 @@ static void __init get_fs_names(char *page)
 
 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
 {
+       struct super_block *s;
        int err = sys_mount(name, "/root", fs, flags, data);
        if (err)
                return err;
 
        sys_chdir((const char __user __force *)"/root");
-       ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
+       s = current->fs->pwd.dentry->d_sb;
+       ROOT_DEV = s->s_dev;
        printk(KERN_INFO
               "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
-              current->fs->pwd.mnt->mnt_sb->s_type->name,
-              current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
-              " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
+              s->s_type->name,
+              s->s_flags & MS_RDONLY ?  " readonly" : "",
+              MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
        return 0;
 }
 
@@ -398,15 +400,42 @@ 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