NFS: Add a boot parameter to disable 64 bit inode numbers

This boot parameter will allow legacy 32-bit applications which call stat()
to continue to function even if the NFSv3/v4 server uses 64-bit inode
numbers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4d175c7..83e2104 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1073,6 +1073,13 @@
 			[NFS] set the maximum lifetime for idmapper cache
 			entries.
 
+	nfs.enable_ino64=
+			[NFS] enable 64-bit inode numbers.
+			If zero, the NFS client will fake up a 32-bit inode
+			number for the readdir() and stat() syscalls instead
+			of returning the full 64-bit number.
+			The default is to return 64-bit inode numbers.
+
 	nmi_watchdog=	[KNL,BUGS=X86-32] Debugging features for SMP kernels
 
 	no387		[BUGS=X86-32] Tells the kernel to use the 387 maths