/*
* Main bcache entry point - handle a read or a write request and decide what to
* do with it; the make_request functions are called by the block layer.
*
* Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
* Copyright 2012 Google, Inc.
*/
#include "bcache.h"
#include "btree.h"
#include "debug.h"
#include "request.h"
#include "writeback.h"
#include <linux/cgroup.h>
#include <linux/module.h>
#include <linux/hash.h>
#include <linux/random.h>
#include "blk-cgroup.h"
#include <trace/events/bcache.h>
#define CUTOFF_CACHE_ADD 95
#define CUTOFF_CACHE_READA 90
struct kmem_cache *bch_search_cache;
static void bch_data_insert_start(struct closure *);
/* Cgroup interface */
#ifdef CONFIG_CGROUP_BCACHE
static struct bch_cgroup bcache_default_cgroup = { .cache_mode = -1 };
static struct bch_cgroup *cgroup_to_bcache(struct cgroup *cgroup)
{
struct cgroup_subsys_state *css;
return cgroup &&
(css = cgroup_subsys_state(cgroup, bcache_subsys_id))
? container_of(css, struct bch_cgroup, css</