1 files changed, 60 insertions, 0 deletions
diff --git a/src/libsystemd/sd-journal/mmap-cache.h b/src/libsystemd/sd-journal/mmap-cache.h
new file mode 100644
index 0000000..1fbc236
--- /dev/null
+++ b/src/libsystemd/sd-journal/mmap-cache.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <errno.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+
+#include "journal-def.h"
+
+typedef struct MMapCache MMapCache;
+typedef struct MMapFileDescriptor MMapFileDescriptor;
+
+typedef enum MMapCacheCategory {
+        MMAP_CACHE_CATEGORY_ANY              = OBJECT_UNUSED,
+        MMAP_CACHE_CATEGORY_DATA             = OBJECT_DATA,
+        MMAP_CACHE_CATEGORY_FIELD            = OBJECT_FIELD,
+        MMAP_CACHE_CATEGORY_ENTRY            = OBJECT_ENTRY,
+        MMAP_CACHE_CATEGORY_DATA_HASH_TABLE  = OBJECT_DATA_HASH_TABLE,
+        MMAP_CACHE_CATEGORY_FIELD_HASH_TABLE = OBJECT_FIELD_HASH_TABLE,
+        MMAP_CACHE_CATEGORY_ENTRY_ARRAY      = OBJECT_ENTRY_ARRAY,
+        MMAP_CACHE_CATEGORY_TAG              = OBJECT_TAG,
+        MMAP_CACHE_CATEGORY_HEADER, /* for reading file header */
+        MMAP_CACHE_CATEGORY_PIN,    /* for temporary pinning a object */
+        _MMAP_CACHE_CATEGORY_MAX,
+        _MMAP_CACHE_CATEGORY_INVALID         = -EINVAL,
+} MMapCacheCategory;
+
+assert_cc((int) _OBJECT_TYPE_MAX < (int) _MMAP_CACHE_CATEGORY_MAX);
+
+static inline MMapCacheCategory type_to_category(ObjectType type) {
+        return type >= 0 && type < _OBJECT_TYPE_MAX ? (MMapCacheCategory) type : MMAP_CACHE_CATEGORY_ANY;
+}
+
+MMapCache* mmap_cache_new(void);
+MMapCache* mmap_cache_ref(MMapCache *m);
+MMapCache* mmap_cache_unref(MMapCache *m);
+DEFINE_TRIVIAL_CLEANUP_FUNC(MMapCache*, mmap_cache_unref);
+
+int mmap_cache_fd_get(
+        MMapFileDescriptor *f,
+        MMapCacheCategory c,
+        bool keep_always,
+        uint64_t offset,
+        size_t size,
+        struct stat *st,
+        void **ret);
+
+int mmap_cache_fd_pin(
+        MMapFileDescriptor *f,
+        MMapCacheCategory c,
+        void *addr,
+        size_t size);
+
+int mmap_cache_add_fd(MMapCache *m, int fd, int prot, MMapFileDescriptor **ret);
+MMapCache* mmap_cache_fd_cache(MMapFileDescriptor *f);
+MMapFileDescriptor* mmap_cache_fd_free(MMapFileDescriptor *f);
+
+void mmap_cache_stats_log_debug(MMapCache *m);
+
+bool mmap_cache_fd_got_sigbus(MMapFileDescriptor *f);