1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_LINUX_OPENAT2_H
3#define _UAPI_LINUX_OPENAT2_H
4
5#include <linux/types.h>
6
7/*
8 * Arguments for how openat2(2) should open the target path. If only @flags and
9 * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
10 *
11 * However, unlike openat(2), unknown or invalid bits in @flags result in
12 * -EINVAL rather than being silently ignored. @mode must be zero unless one of
13 * {O_CREAT, O_TMPFILE} are set.
14 *
15 * @flags: O_* flags.
16 * @mode: O_CREAT/O_TMPFILE file mode.
17 * @resolve: RESOLVE_* flags.
18 */
19struct open_how {
20	__u64 flags;
21	__u64 mode;
22	__u64 resolve;
23};
24
25/* how->resolve flags for openat2(2). */
26#define RESOLVE_NO_XDEV		0x01 /* Block mount-point crossings
27					(includes bind-mounts). */
28#define RESOLVE_NO_MAGICLINKS	0x02 /* Block traversal through procfs-style
29					"magic-links". */
30#define RESOLVE_NO_SYMLINKS	0x04 /* Block traversal through all symlinks
31					(implies OEXT_NO_MAGICLINKS) */
32#define RESOLVE_BENEATH		0x08 /* Block "lexical" trickery like
33					"..", symlinks, and absolute
34					paths which escape the dirfd. */
35#define RESOLVE_IN_ROOT		0x10 /* Make all jumps to "/" and ".."
36					be scoped inside the dirfd
37					(similar to chroot(2)). */
38#define RESOLVE_CACHED		0x20 /* Only complete if resolution can be
39					completed through cached lookup. May
40					return -EAGAIN if that's not
41					possible. */
42
43#endif /* _UAPI_LINUX_OPENAT2_H */
44