[PATCH][BUG]: Pure nfs client performance using odirect.

[Arun R Bharadwaj <arun@linux.vnet.ibm.com>]

Pure nfs client performance using odirect.

When an application opens a file with O_DIRECT flag, if the size of
the data that is written is equal to wsize, the client sends a
WRITE RPC with stable flag set to UNSTABLE followed by a single
COMMIT RPC rather than sending a single WRITE RPC with the stable
flag set to FILE_SYNC. This a bug.

Patch to fix this.

Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>

Index: linux-2.6.36-rc7/fs/nfs/direct.c
===================================================================
--- linux-2.6.36-rc7.orig/fs/nfs/direct.c	2010-11-18 15:53:15.904972002 +0530
+++ linux-2.6.36-rc7/fs/nfs/direct.c	2010-11-18 15:54:01.184972001 +0530
@@ -867,7 +867,7 @@
 		goto out;
 	nfs_alloc_commit_data(dreq);
 
-	if (dreq->commit_data == NULL || count < wsize)
+	if (dreq->commit_data == NULL || count <= wsize)
 		sync = NFS_FILE_SYNC;
 
 	dreq->inode = inode;