src/vfs/missing.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __IDMAP_MISSING_H
#define __IDMAP_MISSING_H

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "../global.h"

#include <errno.h>
#include <linux/types.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <syscall.h>
#include <unistd.h>

#ifndef __NR_mount_setattr
	#if defined __alpha__
		#define __NR_mount_setattr 552
	#elif defined _MIPS_SIM
		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
			#define __NR_mount_setattr (442 + 4000)
		#endif
		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
			#define __NR_mount_setattr (442 + 6000)
		#endif
		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
			#define __NR_mount_setattr (442 + 5000)
		#endif
	#elif defined __ia64__
		#define __NR_mount_setattr (442 + 1024)
	#else
		#define __NR_mount_setattr 442
	#endif
#endif

#ifndef __NR_open_tree
	#if defined __alpha__
		#define __NR_open_tree 538
	#elif defined _MIPS_SIM
		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
			#define __NR_open_tree 4428
		#endif
		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
			#define __NR_open_tree 6428
		#endif
		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
			#define __NR_open_tree 5428
		#endif
	#elif defined __ia64__
		#define __NR_open_tree (428 + 1024)
	#else
		#define __NR_open_tree 428
	#endif
#endif

#ifndef __NR_move_mount
	#if defined __alpha__
		#define __NR_move_mount 539
	#elif defined _MIPS_SIM
		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
			#define __NR_move_mount 4429
		#endif
		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
			#define __NR_move_mount 6429
		#endif
		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
			#define __NR_move_mount 5429
		#endif
	#elif defined __ia64__
		#define __NR_move_mount (428 + 1024)
	#else
		#define __NR_move_mount 429
	#endif
#endif

#ifndef MNT_DETACH
#define MNT_DETACH 2
#endif

#ifndef MS_REC
#define MS_REC 1638
#endif

#ifndef MS_PRIVATE
#define MS_PRIVATE (1 << 18)
#endif

#ifndef MOVE_MOUNT_F_EMPTY_PATH
#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
#endif

#ifndef MOUNT_ATTR_IDMAP
#define MOUNT_ATTR_IDMAP 0x00100000
#endif

#ifndef OPEN_TREE_CLONE
#define OPEN_TREE_CLONE 1
#endif

#ifndef OPEN_TREE_CLOEXEC
#define OPEN_TREE_CLOEXEC O_CLOEXEC
#endif

#ifndef AT_RECURSIVE
#define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */
#endif

#ifndef HAVE_STRUCT_MOUNT_ATTR
struct mount_attr {
	__u64 attr_set;
	__u64 attr_clr;
	__u64 propagation;
	__u64 userns_fd;
};
#endif

static inline int sys_mount_setattr(int dfd, const char *path, unsigned int flags,
				    struct mount_attr *attr, size_t size)
{
	return syscall(__NR_mount_setattr, dfd, path, flags, attr, size);
}

static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags)
{
	return syscall(__NR_open_tree, dfd, filename, flags);
}

static inline int sys_move_mount(int from_dfd, const char *from_pathname, int to_dfd,
				 const char *to_pathname, unsigned int flags)
{
	return syscall(__NR_move_mount, from_dfd, from_pathname, to_dfd, to_pathname, flags);
}

static inline int sys_mount(const char *source, const char *target, const char *fstype,
			    unsigned long int flags, const void *data)
{
	return syscall(__NR_mount, source, target, fstype, flags, data);
}

static inline int sys_umount2(const char *path, int flags)
{
	return syscall(__NR_umount2, path, flags);
}

static inline int sys_execveat(int fd, const char *path, char **argv,
			       char **envp, int flags)
{
#ifdef __NR_execveat
	return syscall(__NR_execveat, fd, path, argv, envp, flags);
#else
	errno = ENOSYS;
	return -1;
#endif
}

#endif /* __IDMAP_MISSING_H */