Use 2 as fallback inode number on 32 Bit kernel

[Amon Ott <a.ott@xxxxxxxxxxxx>]

Hi folks,

the current code in 32 Bit use 1 as fallback number, if the inode number 
calculation returns 0. This always collides with the inode number of the root 
inode. The attached patch changes the fallback number to 2, which seems to be 
unused on our test systems.

Amon Ott
-- 
Dr. Amon Ott
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commit e9b257a3b1364980f3247e110c4ded56b4fbe54a
Author: Amon Ott <ao@xxxxxxxxxxxx>
Date:   Fri Jan 20 15:40:51 2012 +0100

    Use 2 instead of 1 as fallback for 32 Bit inode number.
    
    The root directory of the Ceph mount has inode number 1, so falling back
    to 1 always creates a collision. 2 is unused on my test systems and seems
    less likely to collide.
    
    Signed-off-by: Amon Ott <ao@xxxxxxxxxxxx>

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 9d19790..595f026 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -351,7 +351,7 @@ static inline u32 ceph_ino_to_ino32(__u64 vino)
 	u32 ino = vino & 0xffffffff;
 	ino ^= vino >> 32;
 	if (!ino)
-		ino = 1;
+		ino = 2;
 	return ino;
 }