src/journal/mmap-cache.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5 #include <sys/stat.h>
   6
   7 /* One context per object type, plus one of the header, plus one "additional" one */
   8 #define MMAP_CACHE_MAX_CONTEXTS 9
   9
  10 typedef struct MMapCache MMapCache;
  11 typedef struct MMapFileDescriptor MMapFileDescriptor;
  12
  13 MMapCache* mmap_cache_new(void);
  14 MMapCache* mmap_cache_ref(MMapCache *m);
  15 MMapCache* mmap_cache_unref(MMapCache *m);
  16
  17 int mmap_cache_get(
  18         MMapCache *m,
  19         MMapFileDescriptor *f,
  20         int prot,
  21         unsigned context,
  22         bool keep_always,
  23         uint64_t offset,
  24         size_t size,
  25         struct stat *st,
  26         void **ret,
  27         size_t *ret_size);
  28 MMapFileDescriptor * mmap_cache_add_fd(MMapCache *m, int fd);
  29 void mmap_cache_free_fd(MMapCache *m, MMapFileDescriptor *f);
  30
  31 unsigned mmap_cache_get_hit(MMapCache *m);
  32 unsigned mmap_cache_get_missed(MMapCache *m);
  33
  34 bool mmap_cache_got_sigbus(MMapCache *m, MMapFileDescriptor *f);