From: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Date: Mon, 27 Jan 2020 19:01:54 +0000
Subject: [PATCH] virtiofsd: support nanosecond resolution for file timestamp
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Define HAVE_STRUCT_STAT_ST_ATIM to 1 if `st_atim' is member of `struct
stat' which means support nanosecond resolution for the file timestamp
fields.

Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 8a792b034d4b315251fd842bb4c73a133aa1368f)
---
 configure                   | 16 ++++++++++++++++
 tools/virtiofsd/fuse_misc.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/configure b/configure
index afe9393f04..dd50b03b01 100755
--- a/configure
+++ b/configure
@@ -5217,6 +5217,19 @@ if compile_prog "" "" ; then
     strchrnul=yes
 fi
 
+#########################################
+# check if we have st_atim
+
+st_atim=no
+cat > $TMPC << EOF
+#include <sys/stat.h>
+#include <stddef.h>
+int main(void) { return offsetof(struct stat, st_atim); }
+EOF
+if compile_prog "" "" ; then
+    st_atim=yes
+fi
+
 ##########################################
 # check if trace backend exists
 
@@ -6918,6 +6931,9 @@ fi
 if test "$strchrnul" = "yes" ; then
   echo "HAVE_STRCHRNUL=y" >> $config_host_mak
 fi
+if test "$st_atim" = "yes" ; then
+  echo "HAVE_STRUCT_STAT_ST_ATIM=y" >> $config_host_mak
+fi
 if test "$byteswap_h" = "yes" ; then
   echo "CONFIG_BYTESWAP_H=y" >> $config_host_mak
 fi
diff --git a/tools/virtiofsd/fuse_misc.h b/tools/virtiofsd/fuse_misc.h
index f252baa752..5c618ce21f 100644
--- a/tools/virtiofsd/fuse_misc.h
+++ b/tools/virtiofsd/fuse_misc.h
@@ -7,6 +7,7 @@
  */
 
 #include <pthread.h>
+#include "config-host.h"
 
 /*
  * Versioned symbols cannot be used in some cases because it