tools lib api fs: Add FSTYPE__configured() method

Add FSTYPE__configured() (where FSTYPE is one of sysfs, procfs, debugfs,
tracefs) interface that returns bool state of the filesystem mount:

  true - mounted, false - not mounted

It will not try to mount the filesystem.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-13-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 18 insertions, 10 deletions

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index bc93baf33fff..8afe08a99bc6 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -244,15 +244,20 @@ static const char *fs__mount(int idx)
         return fs__check_mounts(fs) ? fs->path : NULL;
 }
 
-#define FS(name, idx)                   \
-const char *name##__mountpoint(void)    \
-{                                       \
-        return fs__mountpoint(idx);     \
-}                                       \
-                                        \
-const char *name##__mount(void)         \
-{                                       \
-        return fs__mount(idx);          \
+#define FS(name, idx)                           \
+const char *name##__mountpoint(void)            \
+{                                               \
+        return fs__mountpoint(idx);             \
+}                                               \
+                                                \
+const char *name##__mount(void)                 \
+{                                               \
+        return fs__mount(idx);                  \
+}                                               \
+                                                \
+bool name##__configured(void)                   \
+{                                               \
+        return name##__mountpoint() != NULL;    \
 }
 
 FS(sysfs,   FS__SYSFS);
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index a9627ea5e6ae..f654bcb99d1e 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -1,6 +1,8 @@
 #ifndef __API_FS__
 #define __API_FS__
 
+#include <stdbool.h>
+
 /*
  * On most systems <limits.h> would have given us this, but  not on some systems
  * (e.g. GNU/Hurd).
@@ -11,7 +13,8 @@
 
 #define FS(name)                                \
         const char *name##__mountpoint(void);   \
-        const char *name##__mount(void);
+        const char *name##__mount(void);        \
+        bool name##__configured(void);          \
 
 FS(sysfs)
 FS(procfs)