/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_OPENAT2_H

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#define _LINUX_OPENAT2_H

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#include <linux/types.h>

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/*

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* Arguments for how openat2(2) should open the target path. If only @flags and

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* @mode are non-zero, then openat2(2) operates very similarly to openat(2).

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*

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* However, unlike openat(2), unknown or invalid bits in @flags result in

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* -EINVAL rather than being silently ignored. @mode must be zero unless one of

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* {O_CREAT, O_TMPFILE} are set.

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*

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* @flags: O_* flags.

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* @mode: O_CREAT/O_TMPFILE file mode.

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* @resolve: RESOLVE_* flags.

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*/

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struct open_how {

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__u64 flags;

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__u64 mode;

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__u64 resolve;

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};

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/* how->resolve flags for openat2(2). */

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#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings

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(includes bind-mounts). */

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#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style

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"magic-links". */

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#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks

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(implies OEXT_NO_MAGICLINKS) */

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#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like

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"..", symlinks, and absolute

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paths which escape the dirfd. */

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#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."

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be scoped inside the dirfd

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(similar to chroot(2)). */

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#endif /* _LINUX_OPENAT2_H */

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