[Virtio-fs] [PATCH] virtiofsd: conditional compile seccomp flag support

[Eric Ren]

SCMP_FLTATTR_CTL_TSYNC flag is only available on
Linux Kernel 3.17 or greater. So, conditional compile
to make virtio-fs work on older host kernel.

Signed-off-by: Eric Ren <renzhen at linux.alibaba.com>
---
 contrib/virtiofsd/seccomp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contrib/virtiofsd/seccomp.c b/contrib/virtiofsd/seccomp.c
index 4e388adc9c..5a28a90859 100644
--- a/contrib/virtiofsd/seccomp.c
+++ b/contrib/virtiofsd/seccomp.c
@@ -11,6 +11,7 @@
 #include <errno.h>
 #include <seccomp.h>
 #include <glib.h>
+#include <linux/version.h>
 #include "seccomp.h"
 
 static const int syscall_whitelist[] = {
@@ -92,9 +93,12 @@ void setup_seccomp(void)
 		err(1, "seccomp_init()");
 	}
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
+	// SCMP_FLTATR_CTL_TSYNC flag is only available on Linux Kernel 3.17 or greater
 	if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_TSYNC, 1) != 0) {
 		err(1, "seccomp_attr_set(ctx, SCMP_FLTATTR_CTL_TSYNC, 1)");
 	}
+#endif
 
 	for (i = 0; i < G_N_ELEMENTS(syscall_whitelist); i++) {
 		if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW,
-- 
2.17.2 (Apple Git-113)