rbd: Clean up after the previous commit

[mirror_qemu.git] / trace / ftrace.c

diff --git a/trace/ftrace.c b/trace/ftrace.c
index 46b7fdb1f2b88db605831644ff086c790b8f6e27..7de104debaf0f3e655634c173820dc3263f70bca 100644 (file)
--- a/trace/ftrace.c
+++ b/trace/ftrace.c
@@ -9,12 +9,9 @@
  *
  */
 
-#include <stdio.h>
-#include <string.h>
-#include <fcntl.h>
-#include <limits.h>
-#include "trace.h"
+#include "qemu/osdep.h"
 #include "trace/control.h"
+#include "trace/ftrace.h"
 
 int trace_marker_fd;
 
@@ -42,40 +39,24 @@ static int find_debugfs(char *debugfs)
     return 1;
 }
 
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
-    TraceEventID i;
-
-    for (i = 0; i < trace_event_count(); i++) {
-        TraceEvent *ev = trace_event_id(i);
-        stream_printf(stream, "%s [Event ID %u] : state %u\n",
-                      trace_event_get_name(ev), i, trace_event_get_state_dynamic(ev));
-    }
-}
-
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
-{
-    ev->dstate = state;
-}
-
-bool trace_backend_init(const char *events, const char *file)
+bool ftrace_init(void)
 {
     char debugfs[PATH_MAX];
     char path[PATH_MAX];
     int debugfs_found;
     int trace_fd = -1;
 
-    if (file) {
-        fprintf(stderr, "error: -trace file=...: "
-                "option not supported by the selected tracing backend\n");
-        return false;
-    }
-
     debugfs_found = find_debugfs(debugfs);
     if (debugfs_found) {
         snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs);
         trace_fd = open(path, O_WRONLY);
         if (trace_fd < 0) {
+            if (errno == EACCES) {
+                trace_marker_fd = open("/dev/null", O_WRONLY);
+                if (trace_marker_fd != -1) {
+                    return true;
+                }
+            }
             perror("Could not open ftrace 'tracing_on' file");
             return false;
         } else {
@@ -97,6 +78,5 @@ bool trace_backend_init(const char *events, const char *file)
         return false;
     }
 
-    trace_backend_init_events(events);
     return true;
 }