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/*
Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include "glusterfs/list.h"
#include "glusterfs/xlator.h"
#include "glusterfs/locking.h"
#ifndef THROTTLE_TBF_H__
#define THROTTLE_TBF_H__
typedef enum tbf_ops {
TBF_OP_MIN = -1,
TBF_OP_HASH = 0, /* checksum calculation */
TBF_OP_READ = 1, /* inode read(s) */
TBF_OP_READDIR = 2, /* dentry read(s) */
TBF_OP_MAX = 3,
} tbf_ops_t;
/**
* Operation rate specification
*/
typedef struct tbf_opspec {
tbf_ops_t op;
unsigned long rate;
unsigned long maxlimit;
unsigned long token_gen_interval; /* Token generation interval in usec */
} tbf_opspec_t;
/**
* Token bucket for each operation type
*/
typedef struct tbf_bucket {
gf_lock_t lock;
pthread_t tokener; /* token generator thread */
unsigned long tokenrate; /* token generation rate */
unsigned long tokens; /* number of current tokens */
unsigned long maxtokens; /* maximum token in the bucket */
struct list_head queued; /* list of non-conformant requests */
unsigned long token_gen_interval; /* Token generation interval in usec */
} tbf_bucket_t;
typedef struct tbf {
tbf_bucket_t **bucket;
} tbf_t;
tbf_t *
tbf_init(tbf_opspec_t *, unsigned int);
int
tbf_mod(tbf_t *, tbf_opspec_t *);
void
tbf_throttle(tbf_t *, tbf_ops_t, unsigned long);
#define TBF_THROTTLE_BEGIN(tbf, op, tokens) (tbf_throttle(tbf, op, tokens))
#define TBF_THROTTLE_END(tbf, op, tokens)
#endif /** THROTTLE_TBF_H__ */
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