linux-kernel - [PATCH 12/21] perf tools: Do not check debugfs MAGIC for tracing files

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Date:	Wed, 11 Feb 2015 18:09:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 12/21] perf tools: Do not check debugfs MAGIC for tracing files

From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>

It's rather strange to be checking the debugfs MAGIC number for the
tracing directory. A system admin may want to have a custom set of
events to trace and it should be allowed to let the admin make a temp
file (even for tracing virtual boxes, this is useful).

Also with the coming tracefs, the files may not even be under debugfs,
so checking the debugfs MAGIC number is pointless.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: http://lkml.kernel.org/r/20150202193552.546175764@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/api/fs/debugfs.c     | 28 ++++++++++++++--------------
 tools/lib/api/fs/debugfs.h     |  1 -
 tools/perf/util/parse-events.c | 19 -------------------
 3 files changed, 14 insertions(+), 34 deletions(-)

diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index d2b18e887071..d21d4d6b4fd2 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -20,6 +20,20 @@ static const char * const debugfs_known_mountpoints[] = {
 
 static bool debugfs_found;
 
+/* verify that a mountpoint is actually a debugfs instance */
+
+static int debugfs_valid_mountpoint(const char *debugfs)
+{
+	struct statfs st_fs;
+
+	if (statfs(debugfs, &st_fs) < 0)
+		return -ENOENT;
+	else if ((long)st_fs.f_type != (long)DEBUGFS_MAGIC)
+		return -ENOENT;
+
+	return 0;
+}
+
 /* find the path to the mounted debugfs */
 const char *debugfs_find_mountpoint(void)
 {
@@ -60,20 +74,6 @@ const char *debugfs_find_mountpoint(void)
 	return debugfs_mountpoint;
 }
 
-/* verify that a mountpoint is actually a debugfs instance */
-
-int debugfs_valid_mountpoint(const char *debugfs)
-{
-	struct statfs st_fs;
-
-	if (statfs(debugfs, &st_fs) < 0)
-		return -ENOENT;
-	else if ((long)st_fs.f_type != (long)DEBUGFS_MAGIC)
-		return -ENOENT;
-
-	return 0;
-}
-
 /* mount the debugfs somewhere if it's not mounted */
 char *debugfs_mount(const char *mountpoint)
 {
diff --git a/tools/lib/api/fs/debugfs.h b/tools/lib/api/fs/debugfs.h
index 0739881a9897..77bb36a95b07 100644
--- a/tools/lib/api/fs/debugfs.h
+++ b/tools/lib/api/fs/debugfs.h
@@ -21,7 +21,6 @@
 #endif
 
 const char *debugfs_find_mountpoint(void);
-int debugfs_valid_mountpoint(const char *debugfs);
 char *debugfs_mount(const char *mountpoint);
 
 extern char debugfs_mountpoint[];
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 7f8ec6ce2823..ecf069b1661f 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -175,9 +175,6 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
 	char evt_path[MAXPATHLEN];
 	char dir_path[MAXPATHLEN];
 
-	if (debugfs_valid_mountpoint(tracing_events_path))
-		return NULL;
-
 	sys_dir = opendir(tracing_events_path);
 	if (!sys_dir)
 		return NULL;
@@ -473,12 +470,6 @@ static int add_tracepoint_multi_sys(struct list_head *list, int *idx,
 int parse_events_add_tracepoint(struct list_head *list, int *idx,
 				char *sys, char *event)
 {
-	int ret;
-
-	ret = debugfs_valid_mountpoint(tracing_events_path);
-	if (ret)
-		return ret;
-
 	if (strpbrk(sys, "*?"))
 		return add_tracepoint_multi_sys(list, idx, sys, event);
 	else
@@ -1109,13 +1100,6 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 	char evt_path[MAXPATHLEN];
 	char dir_path[MAXPATHLEN];
-	char sbuf[STRERR_BUFSIZE];
-
-	if (debugfs_valid_mountpoint(tracing_events_path)) {
-		printf("  [ Tracepoints not available: %s ]\n",
-			strerror_r(errno, sbuf, sizeof(sbuf)));
-		return;
-	}
 
 	sys_dir = opendir(tracing_events_path);
 	if (!sys_dir)
@@ -1163,9 +1147,6 @@ int is_valid_tracepoint(const char *event_string)
 	char evt_path[MAXPATHLEN];
 	char dir_path[MAXPATHLEN];
 
-	if (debugfs_valid_mountpoint(tracing_events_path))
-		return 0;
-
 	sys_dir = opendir(tracing_events_path);
 	if (!sys_dir)
 		return 0;
-- 
1.9.3

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