tools lib fs: Pass filename to debugfs__strerror_open

It was hardcoded for one specific tracepoint, leftover from its initial
user: 'perf trace'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-j1jicvwljy5qx1nah4mkmyke@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/api/fs/debugfs.c

@@ -100,7 +100,7 @@ char *debugfs_mount(const char *mountpoint)
 	return debugfs_mountpoint;
 }
 
-int debugfs__strerror_open(int err, char *buf, size_t size)
+int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename)
 {
 	char sbuf[128];
 
@@ -114,9 +114,9 @@ int debugfs__strerror_open(int err, char *buf, size_t size)
 		break;
 	case EACCES:
 		snprintf(buf, size,
-			 "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
+			 "Error:\tNo permissions to read %s/%s\n"
 			 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
-			 debugfs_mountpoint, debugfs_mountpoint);
+			 debugfs_mountpoint, filename, debugfs_mountpoint);
 		break;
 	default:
 		snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));

tools/lib/api/fs/debugfs.h

@@ -26,6 +26,6 @@ char *debugfs_mount(const char *mountpoint);
 
 extern char debugfs_mountpoint[];
 
-int debugfs__strerror_open(int err, char *buf, size_t size);
+int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename);
 
 #endif /* __API_DEBUGFS_H__ */

tools/perf/builtin-trace.c

@@ -2056,7 +2056,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 	if (trace->trace_syscalls &&
 	    perf_evlist__add_syscall_newtp(evlist, trace__sys_enter,
 					   trace__sys_exit))
-		goto out_error_tp;
+		goto out_error_raw_syscalls;
 
 	if (trace->trace_syscalls)
 		perf_evlist__add_vfs_getname(evlist);
@@ -2210,7 +2210,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 	char errbuf[BUFSIZ];
 
 out_error_tp:
-	debugfs__strerror_open(errno, errbuf, sizeof(errbuf));
+out_error_raw_syscalls:
+	debugfs__strerror_open(errno, errbuf, sizeof(errbuf), "tracing/events/raw_syscalls");
 	goto out_error;
 
 out_error_mmap: