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-rw-r--r--include/uapi/linux/nsfs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/uapi/linux/nsfs.h b/include/uapi/linux/nsfs.h
new file mode 100644
index 000000000000..5cacd5c1b5d7
--- /dev/null
+++ b/include/uapi/linux/nsfs.h
@@ -0,0 +1,11 @@
+#ifndef __LINUX_NSFS_H
+#define __LINUX_NSFS_H
+
+#include <linux/ioctl.h>
+
+#define NSIO 0xb7
+
+/* Returns a file descriptor that refers to an owning user namespace */
+#define NS_GET_USERNS _IO(NSIO, 0x1)
+
+#endif /* __LINUX_NSFS_H */