[dm-devel] [PATCH 6/6] flush and sync before reboot

[lixiaokeng]

Write to /etc/multipath/prkeys, for example
0x0000000000000001 3620f17c1007609293677bb210000058e.
Power-off and restart in 5 seconds. There will
be some 0 byte in /etc/multipath/prkeys.
Here we flush and sync before reboot.

Signed-off-by: Jianbing Jiao <jiangjianbiang at huawei.com>
Signed-off-by: Lixiaokeng <lixiaokeng at huawei.com>
---
 libmultipath/util.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libmultipath/util.c b/libmultipath/util.c
index 1dad90f2..11d4a398 100644
--- a/libmultipath/util.c
+++ b/libmultipath/util.c
@@ -355,6 +355,13 @@ int safe_write(int fd, const void *buf, size_t count)
 		count -= r;
 		buf = (const char *)buf + r;
 	}
+
+	/* sync->disk */
+	if (fsync(fd) < 0) {
+		condlog(0, "failed to fsync fd :%d", fd);
+		return -errno;
+	}
+
 	return 0;
 }

--