From: Arun Bharadwaj <arun@linux.vnet.ibm.com>
Date: Thu, 18 Nov 2010 10:36:43 +0000 (+0000)
Subject: Pure nfs client performance using odirect.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b47d19de2c714020ba8f5545a6e7d4968f37eb45;p=linux-beck.git

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>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 84d3c8b90206..e6ace0d93c71 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -867,7 +867,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov,
 		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;