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authorPavel Emelyanov2013-06-11 14:41:24 +0400
committerDavid S. Miller2013-06-12 15:07:21 -0700
commit274038f8c94c493e2977983e2aecb5f5f0778479 (patch)
tree59c639c040acb5af3eafe2a2eb7787c03dd5bfbf /drivers/net/tun.c
parent7c0cadc69ca2ac8893aa162ee80d92a805840909 (diff)
tun: Report "persist" flag to userspace
The TUN_PERSIST flag is not reported at all -- both TUNGETIFF, and sysfs "flags" attribute skip one. Knowing whether a device is persistent or not is critical for checkpoint-restore, thus I propose to add the read-only IFF_PERSIST one for this. Setting this new IFF_PERSIST is hardly possible, as TUNSETIFF doesn't check for unknown flags being zero and thus there can be trash. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 89776c592151..b90a73165d30 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1530,6 +1530,9 @@ static int tun_flags(struct tun_struct *tun)
if (tun->flags & TUN_TAP_MQ)
flags |= IFF_MULTI_QUEUE;
+ if (tun->flags & TUN_PERSIST)
+ flags |= IFF_PERSIST;
+
return flags;
}