perf trace: Store the major number for a file when storing its pathname

We keep a table for the fds to map them back to pathnames when showing
'fd' based APIs such as write(), store as well the major number for the
device the path is in, to use in things like choosing the right ioctl
'cmd' beautifier.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-qjkds7bnk7v7fk2xhqsb0a4v@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

@@ -60,6 +60,7 @@
 #include <linux/stringify.h>
 #include <linux/time64.h>
 #include <fcntl.h>
+#include <sys/sysmacros.h>
 
 #include "sane_ctype.h"
 
@@ -959,6 +960,7 @@ static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)
 
 struct file {
 	char *pathname;
+	int  dev_maj;
 };
 
 /**
@@ -1068,6 +1070,9 @@ static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pat
 	struct file *file = thread_trace__files_entry(ttrace, fd);
 
 	if (file != NULL) {
+		struct stat st;
+		if (stat(pathname, &st) == 0)
+			file->dev_maj = major(st.st_rdev);
 		file->pathname = strdup(pathname);
 		if (file->pathname)
 			return 0;