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
10 extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg);
11 struct 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 */
19 int memfd_check_seals_mmap(struct file *file, vm_flags_t *vm_flags_ptr);
20 #else
memfd_fcntl(struct file * f,unsigned int c,unsigned int a)21 static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
22 {
23 return -EINVAL;
24 }
memfd_alloc_folio(struct file * memfd,pgoff_t idx)25 static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx)
26 {
27 return ERR_PTR(-EINVAL);
28 }
memfd_check_seals_mmap(struct file * file,vm_flags_t * vm_flags_ptr)29 static 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 */
37