include/qemu/memfd.h

   1 #ifndef QEMU_MEMFD_H
   2 #define QEMU_MEMFD_H
   3
   4
   5 #ifndef F_LINUX_SPECIFIC_BASE
   6 #define F_LINUX_SPECIFIC_BASE 1024
   7 #endif
   8
   9 #ifndef F_ADD_SEALS
  10 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
  11 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
  12
  13 #define F_SEAL_SEAL     0x0001  /* prevent further seals from being set */
  14 #define F_SEAL_SHRINK   0x0002  /* prevent file from shrinking */
  15 #define F_SEAL_GROW     0x0004  /* prevent file from growing */
  16 #define F_SEAL_WRITE    0x0008  /* prevent writes */
  17 #endif
  18
  19 #ifndef MFD_CLOEXEC
  20 #define MFD_CLOEXEC 0x0001U
  21 #endif
  22
  23 #ifndef MFD_ALLOW_SEALING
  24 #define MFD_ALLOW_SEALING 0x0002U
  25 #endif
  26
  27 #ifndef MFD_HUGETLB
  28 #define MFD_HUGETLB 0x0004U
  29 #endif
  30
  31 #ifndef MFD_HUGE_SHIFT
  32 #define MFD_HUGE_SHIFT 26
  33 #endif
  34
  35 #if defined CONFIG_LINUX && !defined CONFIG_MEMFD
  36 int memfd_create(const char *name, unsigned int flags);
  37 #endif
  38
  39 int qemu_memfd_create(const char *name, size_t size, bool hugetlb,
  40                       uint64_t hugetlbsize, unsigned int seals, Error **errp);
  41 bool qemu_memfd_alloc_check(void);
  42 void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
  43                        int *fd, Error **errp);
  44 void qemu_memfd_free(void *ptr, size_t size, int fd);
  45 bool qemu_memfd_check(unsigned int flags);
  46
  47 #endif /* QEMU_MEMFD_H */