Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_MEMFD_H
3#define __LINUX_MEMFD_H
4
5#include <linux/file.h>
6
7#define MEMFD_ANON_NAME "[memfd]"
8
9#ifdef CONFIG_MEMFD_CREATE
10extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg);
11struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx);
12/*
13 * Check for any existing seals on mmap, return an error if access is denied due
14 * to sealing, or 0 otherwise.
15 *
16 * We also update VMA flags if appropriate by manipulating the VMA flags pointed
17 * to by vm_flags_ptr.
18 */
19int memfd_check_seals_mmap(struct file *file, vm_flags_t *vm_flags_ptr);
20#else
21static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
22{
23 return -EINVAL;
24}
25static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx)
26{
27 return ERR_PTR(-EINVAL);
28}
29static inline int memfd_check_seals_mmap(struct file *file,
30 vm_flags_t *vm_flags_ptr)
31{
32 return 0;
33}
34#endif
35
36#endif /* __LINUX_MEMFD_H */