linux-kernel - [PATCH 4.9 58/74] NFSv2: Fix write regression

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Date:   Fri, 20 Sep 2019 00:04:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Stancek <jstancek@...hat.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 58/74] NFSv2: Fix write regression

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit d33d4beb522987d1c305c12500796f9be3687dee ]

Ensure we update the write result count on success, since the
RPC call itself does not do so.

Reported-by: Jan Stancek <jstancek@...hat.com>
Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Tested-by: Jan Stancek <jstancek@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/proc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index f3e8bcbd29a09..06e72229be123 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -610,8 +610,10 @@ static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
 
 static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 {
-	if (task->tk_status >= 0)
+	if (task->tk_status >= 0) {
+		hdr->res.count = hdr->args.count;
 		nfs_writeback_update_inode(hdr);
+	}
 	return 0;
 }
 
-- 
2.20.1