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Current File : //usr/src/file_protector-1.1-1576/memory.h
/**
@file
@brief    Linux kernel memory management interface wrapper
@details  Copyright (c) 2017-2018 Acronis International GmbH
@author   Mikhail Krivtsov (mikhail.krivtsov@acronis.com)
@since    $Id: $
*/

#pragma once

#ifndef BPF_PROGRAM

#include <linux/mm.h>       // is_vmalloc_addr()
#include <linux/slab.h>		// kmalloc(), kzalloc(), kfree()
#include <linux/vmalloc.h>  // vmalloc(), vfree()

#include "safe_kobject.h"

#define mem_flags(nowait) ((nowait) ? (GFP_ATOMIC) : (GFP_KERNEL))
#define mem_alloc_with_alloc_flags(size, nowait) kmalloc(size, mem_flags(nowait))
#define mem_alloc0_with_alloc_flags(size, nowait) kzalloc(size, mem_flags(nowait))

#define mem_alloc(size) mem_alloc_with_alloc_flags(size, false)
#define mem_alloc0(size) mem_alloc0_with_alloc_flags(size, false)

#define mem_alloc_nowait(size) mem_alloc_with_alloc_flags(size, true)
#define mem_alloc0_nowait(size) mem_alloc0_with_alloc_flags(size, true)

#define mem_free(p) kfree(p)

static inline void *kvmalloc_compat(size_t size, gfp_t flags)
{
    void *ret;
    ret = kmalloc(size, flags | __GFP_NOWARN);
    if (ret)
    {
        return ret;
    }
    return vmalloc(size);
}

static inline void kvfree_compat(void *addr)
{
    if (is_vmalloc_addr(addr))
        vfree(addr);
    else
        kfree(addr);
}

#define large_mem_alloc(size) kvmalloc_compat(size, GFP_KERNEL)
#define large_mem_free(p) kvfree_compat(p)

#define vmem_alloc(size) vmalloc(size)
#define vmem_free(p) vfree(p)

// kmem_cache used to make semantics like 'new' or 'delete'
#define KMEM_STRUCT_CACHE_NAME(__struct) g_##__struct##_new_cache
#define KMEM_STRUCT_CACHE_DECLARE(__struct) struct kmem_cache* KMEM_STRUCT_CACHE_NAME(__struct)
#define KMEM_STRUCT_CACHE_INIT(__struct, flags, ctor) (KMEM_STRUCT_CACHE_NAME(__struct) = kmem_cache_create("fileprotector_" #__struct, sizeof(__struct##_t), __alignof__(__struct##_t), flags, ctor))
#define KMEM_STRUCT_CACHE_DEINIT(__struct) do{ if (KMEM_STRUCT_CACHE_NAME(__struct)) kmem_cache_destroy(KMEM_STRUCT_CACHE_NAME(__struct)); }while(0)
#define KMEM_NEW_WITH_ALLOC_FLAGS(__struct, nowait) (__struct##_t*) kmem_cache_alloc(KMEM_STRUCT_CACHE_NAME(__struct), mem_flags(nowait))
#define KMEM_NEW(__struct) (__struct##_t*) KMEM_NEW_WITH_ALLOC_FLAGS(__struct, false)
#define KMEM_NEW0_WITH_ALLOC_FLAGS(__struct, nowait) (__struct##_t*) kmem_cache_zalloc(KMEM_STRUCT_CACHE_NAME(__struct), mem_flags(nowait))
#define KMEM_NEW0(__struct) (__struct##_t*) KMEM_NEW0_WITH_ALLOC_FLAGS(__struct, false)
#define KMEM_DELETE(__struct, ptr) kmem_cache_free(KMEM_STRUCT_CACHE_NAME(__struct), ptr)

extern struct kmem_cache *g_handles_cache;

int memory_init(void);
void memory_deinit(void);

typedef struct memory_metrics_s {
    safe_kobject_t skobj;
    atomic64_t total_file_contexts_tables;
    atomic64_t total_transports;
    atomic64_t total_transport_events;
    atomic64_t total_msgs;
    atomic64_t total_msgs_size;
    atomic64_t total_sized_msgs;
    atomic64_t total_sized_msgs_size;
} memory_metrics_t;

extern memory_metrics_t* g_memory_metrics;
#endif

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