linux-kernel - [PATCH 1/3] nbd: pass MSG_* flags to kernel

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Date:	Fri, 27 May 2011 15:00:01 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org,
	Paul Clements <Paul.Clements@...eleye.com>
Subject: [PATCH 1/3] nbd: pass MSG_* flags to kernel_recvmsg()

Unlike kernel_sendmsg(), kernel_recvmsg() requires passing flags explicitly
via last parameter instead of struct msghdr.msg_flags. Therefore calls to
sock_xmit(lo, 0, ..., MSG_WAITALL) have not been processed properly by tcp
layer wrt. the flag. Fix it.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Paul Clements <Paul.Clements@...eleye.com>
---
 drivers/block/nbd.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index e6fc716aca45..1df3bfe5225b 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -192,7 +192,8 @@ static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
 			if (lo->xmit_timeout)
 				del_timer_sync(&ti);
 		} else
-			result = kernel_recvmsg(sock, &msg, &iov, 1, size, 0);
+			result = kernel_recvmsg(sock, &msg, &iov, 1, size,
+						msg.msg_flags);
 
 		if (signal_pending(current)) {
 			siginfo_t info;
-- 
1.7.5.2

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