Linux kernel mirror (for testing)
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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#ifdef CONFIG_MEMFD_CREATE
8extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg);
9struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx);
10unsigned int *memfd_file_seals_ptr(struct file *file);
11#else
12static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
13{
14 return -EINVAL;
15}
16static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx)
17{
18 return ERR_PTR(-EINVAL);
19}
20
21static inline unsigned int *memfd_file_seals_ptr(struct file *file)
22{
23 return NULL;
24}
25#endif
26
27/* Retrieve memfd seals associated with the file, if any. */
28static inline unsigned int memfd_file_seals(struct file *file)
29{
30 unsigned int *sealsp = memfd_file_seals_ptr(file);
31
32 return sealsp ? *sealsp : 0;
33}
34
35#endif /* __LINUX_MEMFD_H */