perf tools: Do not check debugfs MAGIC for tracing files
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@goodmis.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150202193552.546175764@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index d2b18e8..d21d4d6 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -20,6 +20,20 @@
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 @@
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 0739881..77bb36a 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 7f8ec6c..ecf069b 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -175,9 +175,6 @@
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 @@
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 @@
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 @@
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;