xref: /linux-6.15/include/linux/memfd.h (revision fa00b8ef)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_MEMFD_H
#define __LINUX_MEMFD_H

#include <linux/file.h>

#ifdef CONFIG_MEMFD_CREATE
extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg);
struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx);
/*
 * Check for any existing seals on mmap, return an error if access is denied due
 * to sealing, or 0 otherwise.
 *
 * We also update VMA flags if appropriate by manipulating the VMA flags pointed
 * to by vm_flags_ptr.
 */
int memfd_check_seals_mmap(struct file *file, unsigned long *vm_flags_ptr);
#else
static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
{
	return -EINVAL;
}
static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx)
{
	return ERR_PTR(-EINVAL);
}
static inline int memfd_check_seals_mmap(struct file *file,
					 unsigned long *vm_flags_ptr)
{
	return 0;
}
#endif

#endif /* __LINUX_MEMFD_H */