[PATCH 1/3]fs/inode: iunique() Optimize Performance

[Liuweni]

---
move the if condition out the while{}.
While the function executing, the if 
condition won't check again and again.
And this code won't change the function
of iunique().

---
Signed-off-by: Liuwenyi<qingshenlwy@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
diff --git a/fs/inode.c b/fs/inode.c
index 4d8e3be..8ff1e99 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -838,9 +838,10 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
 	ino_t res;
 
 	spin_lock(&inode_lock);
+
+	if (counter <= max_reserved)
+		counter = max_reserved + 1;
 	do {
-		if (counter <= max_reserved)
-			counter = max_reserved + 1;
 		res = counter++;
 		head = inode_hashtable + hash(sb, res);
 		inode = find_inode_fast(sb, head, res);

 				
--------------
Best Regards,
Liuweni
2009-11-25

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