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       1  /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
       2  #ifndef __LINUX_NSFS_H
       3  #define __LINUX_NSFS_H
       4  
       5  #include <linux/ioctl.h>
       6  
       7  #define NSIO	0xb7
       8  
       9  /* Returns a file descriptor that refers to an owning user namespace */
      10  #define NS_GET_USERNS		_IO(NSIO, 0x1)
      11  /* Returns a file descriptor that refers to a parent namespace */
      12  #define NS_GET_PARENT		_IO(NSIO, 0x2)
      13  /* Returns the type of namespace (CLONE_NEW* value) referred to by
      14     file descriptor */
      15  #define NS_GET_NSTYPE		_IO(NSIO, 0x3)
      16  /* Get owner UID (in the caller's user namespace) for a user namespace */
      17  #define NS_GET_OWNER_UID	_IO(NSIO, 0x4)
      18  
      19  #endif /* __LINUX_NSFS_H */