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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Statistics for NFS server.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _NFSD_STATS_H
#define _NFSD_STATS_H
#include <uapi/linux/nfsd/stats.h>
#include <linux/percpu_counter.h>
#include "export.h"
#include "netns.h"
struct proc_dir_entry *nfsd_proc_stat_init(struct net *net);
void nfsd_proc_stat_shutdown(struct net *net);
/**
* nfsd_stats_rc_hits_inc - Count a duplicate reply cache hit
* @nn: target network namespace
*
* These reply cache counters are updated once per RPC. Readers use
* percpu_counter_sum_positive(), so local batching does not affect
* read accuracy.
*/
static inline void nfsd_stats_rc_hits_inc(struct nfsd_net *nn)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_RC_HITS], 1);
}
/**
* nfsd_stats_rc_misses_inc - Count a duplicate reply cache miss
* @nn: target network namespace
*
* See nfsd_stats_rc_hits_inc() for batching rationale.
*/
static inline void nfsd_stats_rc_misses_inc(struct nfsd_net *nn)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_RC_MISSES], 1);
}
/**
* nfsd_stats_rc_nocache_inc - Count a request not cached in the reply cache
* @nn: target network namespace
*
* See nfsd_stats_rc_hits_inc() for batching rationale.
*/
static inline void nfsd_stats_rc_nocache_inc(struct nfsd_net *nn)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_RC_NOCACHE], 1);
}
static inline void nfsd_stats_fh_stale_inc(struct nfsd_net *nn,
struct svc_export *exp)
{
percpu_counter_inc(&nn->counter[NFSD_STATS_FH_STALE]);
if (exp && exp->ex_stats)
percpu_counter_inc(&exp->ex_stats->counter[EXP_STATS_FH_STALE]);
}
/**
* nfsd_stats_io_read_add - Count number of bytes for an NFS READ
* @nn: target network namespace
* @exp: target export
* @amount: byte count
*
* These counters are updated on every READ request. Readers use
* percpu_counter_sum_positive(), so local batching does not affect
* read accuracy.
*/
static inline void nfsd_stats_io_read_add(struct nfsd_net *nn,
struct svc_export *exp, s64 amount)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_IO_READ], amount);
if (exp && exp->ex_stats)
percpu_counter_add_local(&exp->ex_stats->counter[EXP_STATS_IO_READ],
amount);
}
/**
* nfsd_stats_io_write_add - Count number of bytes for an NFS WRITE
* @nn: target network namespace
* @exp: target export
* @amount: byte count
*
* These counters are updated on every WRITE request. Readers use
* percpu_counter_sum_positive(), so local batching does not affect
* read accuracy.
*/
static inline void nfsd_stats_io_write_add(struct nfsd_net *nn,
struct svc_export *exp, s64 amount)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_IO_WRITE], amount);
if (exp && exp->ex_stats)
percpu_counter_add_local(&exp->ex_stats->counter[EXP_STATS_IO_WRITE],
amount);
}
static inline void nfsd_stats_payload_misses_inc(struct nfsd_net *nn)
{
percpu_counter_inc(&nn->counter[NFSD_STATS_PAYLOAD_MISSES]);
}
/**
* nfsd_stats_drc_mem_usage_add - Add memory used by a cache item
* @nn: target network namespace
* @amount: byte count
*
* percpu_counter_add_local() keeps updates on the per-CPU fast
* path. The sole reader, percpu_counter_sum_positive(), sums the
* per-CPU deltas, so batching locally does not lose accuracy.
*/
static inline void nfsd_stats_drc_mem_usage_add(struct nfsd_net *nn, s64 amount)
{
percpu_counter_add_local(&nn->counter[NFSD_STATS_DRC_MEM_USAGE],
amount);
}
/**
* nfsd_stats_drc_mem_usage_sub - Subtract memory used by a cache item
* @nn: target network namespace
* @amount: byte count
*
* See nfsd_stats_drc_mem_usage_add() for batching rationale.
*/
static inline void nfsd_stats_drc_mem_usage_sub(struct nfsd_net *nn, s64 amount)
{
percpu_counter_sub_local(&nn->counter[NFSD_STATS_DRC_MEM_USAGE],
amount);
}
#ifdef CONFIG_NFSD_V4
static inline void nfsd_stats_cb_op_inc(struct nfsd_net *nn, u32 opcode)
{
if (opcode >= OP_CB_GETATTR && opcode <= OP_CB_OFFLOAD)
percpu_counter_inc(&nn->cb_counter[opcode]);
}
#endif
#endif /* _NFSD_STATS_H */
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