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 8 extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg); 9 struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx); 10 /* 11 * Check for any existing seals on mmap, return an error if access is denied due 12 * to sealing, or 0 otherwise. 13 * 14 * We also update VMA flags if appropriate by manipulating the VMA flags pointed 15 * to by vm_flags_ptr. 16 */ 17 int memfd_check_seals_mmap(struct file *file, unsigned long *vm_flags_ptr); 18 #else 19 static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a) 20 { 21 return -EINVAL; 22 } 23 static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx) 24 { 25 return ERR_PTR(-EINVAL); 26 } 27 static inline int memfd_check_seals_mmap(struct file *file, 28 unsigned long *vm_flags_ptr) 29 { 30 return 0; 31 } 32 #endif 33 34 #endif /* __LINUX_MEMFD_H */ 35