From: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Date: Mon, 27 Jan 2020 19:01:39 +0000
Subject: [PATCH] virtiofsd: Add timestamp to the log with FUSE_LOG_DEBUG level
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virtiofsd has some threads, so we see a lot of logs with debug option.
It would be useful for debugging if we can see the timestamp.

Add nano second timestamp, which got by get_clock(), to the log with
FUSE_LOG_DEBUG level if the syslog option isn't set.

The log is like as:

  # ./virtiofsd -d -o vhost_user_socket=/tmp/vhostqemu0 -o source=/tmp/share0 -o cache=auto
  ...
  [5365943125463727] [ID: 00000002] fv_queue_thread: Start for queue 0 kick_fd 9
  [5365943125568644] [ID: 00000002] fv_queue_thread: Waiting for Queue 0 event
  [5365943125573561] [ID: 00000002] fv_queue_thread: Got queue event on Queue 0

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 50fb955aa0e6ede929422146936cf68bf1ca876f)
---
 tools/virtiofsd/passthrough_ll.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index f08324f000..98114a3f4a 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -36,6 +36,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/timer.h"
 #include "fuse_virtio.h"
 #include "fuse_log.h"
 #include "fuse_lowlevel.h"
@@ -2276,7 +2277,13 @@ static void log_func(enum fuse_log_level level, const char *fmt, va_list ap)
     }
 
     if (current_log_level == FUSE_LOG_DEBUG) {
-        localfmt = g_strdup_printf("[ID: %08ld] %s", syscall(__NR_gettid), fmt);
+        if (!use_syslog) {
+            localfmt = g_strdup_printf("[%" PRId64 "] [ID: %08ld] %s",
+                                       get_clock(), syscall(__NR_gettid), fmt);
+        } else {
+            localfmt = g_strdup_printf("[ID: %08ld] %s", syscall(__NR_gettid),
+                                       fmt);
+        }
         fmt = localfmt;
     }