1 files changed, 34 insertions, 0 deletions
diff --git a/src/journal/mmap-cache.h b/src/journal/mmap-cache.h
new file mode 100644
index 0000000..28d5ab1
--- /dev/null
+++ b/src/journal/mmap-cache.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+#include <sys/stat.h>
+
+/* One context per object type, plus one of the header, plus one "additional" one */
+#define MMAP_CACHE_MAX_CONTEXTS 9
+
+typedef struct MMapCache MMapCache;
+typedef struct MMapFileDescriptor MMapFileDescriptor;
+
+MMapCache* mmap_cache_new(void);
+MMapCache* mmap_cache_ref(MMapCache *m);
+MMapCache* mmap_cache_unref(MMapCache *m);
+
+int mmap_cache_get(
+        MMapCache *m,
+        MMapFileDescriptor *f,
+        int prot,
+        unsigned context,
+        bool keep_always,
+        uint64_t offset,
+        size_t size,
+        struct stat *st,
+        void **ret,
+        size_t *ret_size);
+MMapFileDescriptor * mmap_cache_add_fd(MMapCache *m, int fd);
+void mmap_cache_free_fd(MMapCache *m, MMapFileDescriptor *f);
+
+unsigned mmap_cache_get_hit(MMapCache *m);
+unsigned mmap_cache_get_missed(MMapCache *m);
+
+bool mmap_cache_got_sigbus(MMapCache *m, MMapFileDescriptor *f);