[igt-dev] [PATCH i-g-t 2/3] lib/igt_aux: Make "is_mountpoint" public ("igt_is_mountpoint")

[James Shargo <jshargo@chromium.org>]

From: Jim Shargo <jshargo@chromium.org>

This change supports the subsequent testing of ConfigFS-based VKMS
features, which require their own mounting.

Signed-off-by: Jim Shargo <jshargo@chromium.org>
---
 lib/igt_aux.c     | 25 +++++++++++++++++++++++++
 lib/igt_aux.h     |  2 ++
 lib/igt_debugfs.c | 29 ++---------------------------
 3 files changed, 29 insertions(+), 27 deletions(-)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 386e25783..4ec5fc154 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -1970,6 +1970,31 @@ bool igt_allow_unlimited_files(void)
 	return setrlimit(RLIMIT_NOFILE, &rlim) == 0;
 }
 
+bool igt_is_mountpoint(const char *path)
+{
+	char buf[strlen(path) + 4];
+	struct stat st;
+	dev_t dev;
+
+	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	dev = st.st_dev;
+
+	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	return dev != st.st_dev;
+}
+
 /**
  * vfs_file_max: report maximum number of files
  *
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index fb76b0313..298c610f2 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -311,6 +311,8 @@ double igt_stop_siglatency(struct igt_mean *result);
 
 bool igt_allow_unlimited_files(void);
 
+bool igt_is_mountpoint(const char *path);
+
 int igt_is_process_running(const char *comm);
 int igt_terminate_process(int sig, const char *comm);
 void igt_lsof(const char *dpath);
diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index a7b54bae5..63fc6b9e7 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -67,37 +67,12 @@
  * General debugfs helpers
  */
 
-static bool is_mountpoint(const char *path)
-{
-	char buf[strlen(path) + 4];
-	struct stat st;
-	dev_t dev;
-
-	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
-	if (stat(buf, &st))
-		return false;
-
-	if (!S_ISDIR(st.st_mode))
-		return false;
-
-	dev = st.st_dev;
-
-	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
-	if (stat(buf, &st))
-		return false;
-
-	if (!S_ISDIR(st.st_mode))
-		return false;
-
-	return dev != st.st_dev;
-}
-
 static const char *__igt_debugfs_mount(void)
 {
-	if (is_mountpoint("/sys/kernel/debug"))
+	if (igt_is_mountpoint("/sys/kernel/debug"))
 		return "/sys/kernel/debug";
 
-	if (is_mountpoint("/debug"))
+	if (igt_is_mountpoint("/debug"))
 		return "/debug";
 
 	if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
-- 
2.41.0.162.gfafddb0af9-goog