linux-kernel - [PATCH v2] Tools: hv: fix file overwriting of hv_fcopy

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Message-Id: <1403915037-21658-1-git-send-email-yuezha@microsoft.com>
Date:	Fri, 27 Jun 2014 17:23:57 -0700
From:	Yue Zhang <yuezha@...rosoft.com>
To:	kys@...rosoft.com, haiyangz@...rosoft.com,
	driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org, olaf@...fle.de, jasowang@...hat.com,
	apw@...onical.com
Cc:	decui@...rosoft.com, huishao@...rosoft.com
Subject: [PATCH v2] Tools: hv: fix file overwriting of hv_fcopy_daemon

From: Yue Zhang <yuezha@...rosoft.com>

hv_fcopy_daemon fails to overwrite a file if the target file already
exits.

Add O_TRUNC flag on opening.

Signed-off-by: Yue Zhang <yuezha@...rosoft.com>
---
 tools/hv/hv_fcopy_daemon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
index fba1c75..2a86297 100644
--- a/tools/hv/hv_fcopy_daemon.c
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -88,7 +88,8 @@ static int hv_start_fcopy(struct hv_start_fcopy *smsg)
 		}
 	}
 
-	target_fd = open(target_fname, O_RDWR | O_CREAT | O_CLOEXEC, 0744);
+	target_fd = open(target_fname,
+			O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
 	if (target_fd == -1) {
 		syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
 		goto done;
-- 
1.9.1

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