LXR linux/fs/nfs/iostat.h

   1/*
   2 *  linux/fs/nfs/iostat.h
   3 *
   4 *  Declarations for NFS client per-mount statistics
   5 *
   6 *  Copyright (C) 2005, 2006 Chuck Lever <cel@netapp.com>
   7 *
   8 */
   9
  10#ifndef _NFS_IOSTAT
  11#define _NFS_IOSTAT
  12
  13#include <linux/percpu.h>
  14#include <linux/cache.h>
  15#include <linux/nfs_iostat.h>
  16
  17struct nfs_iostats {
  18        unsigned long long      bytes[__NFSIOS_BYTESMAX];
  19#ifdef CONFIG_NFS_FSCACHE
  20        unsigned long long      fscache[__NFSIOS_FSCACHEMAX];
  21#endif
  22        unsigned long           events[__NFSIOS_COUNTSMAX];
  23} ____cacheline_aligned;
  24
  25static inline void nfs_inc_server_stats(const struct nfs_server *server,
  26                                        enum nfs_stat_eventcounters stat)
  27{
  28        struct nfs_iostats *iostats;
  29        int cpu;
  30
  31        cpu = get_cpu();
  32        iostats = per_cpu_ptr(server->io_stats, cpu);
  33        iostats->events[stat]++;
  34        put_cpu();
  35}
  36
  37static inline void nfs_inc_stats(const struct inode *inode,
  38                                 enum nfs_stat_eventcounters stat)
  39{
  40        nfs_inc_server_stats(NFS_SERVER(inode), stat);
  41}
  42
  43static inline void nfs_add_server_stats(const struct nfs_server *server,
  44                                        enum nfs_stat_bytecounters stat,
  45                                        unsigned long addend)
  46{
  47        struct nfs_iostats *iostats;
  48        int cpu;
  49
  50        cpu = get_cpu();
  51        iostats = per_cpu_ptr(server->io_stats, cpu);
  52        iostats->bytes[stat] += addend;
  53        put_cpu();
  54}
  55
  56static inline void nfs_add_stats(const struct inode *inode,
  57                                 enum nfs_stat_bytecounters stat,
  58                                 unsigned long addend)
  59{
  60        nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
  61}
  62
  63#ifdef CONFIG_NFS_FSCACHE
  64static inline void nfs_add_fscache_stats(struct inode *inode,
  65                                         enum nfs_stat_fscachecounters stat,
  66                                         unsigned long addend)
  67{
  68        struct nfs_iostats *iostats;
  69        int cpu;
  70
  71        cpu = get_cpu();
  72        iostats = per_cpu_ptr(NFS_SERVER(inode)->io_stats, cpu);
  73        iostats->fscache[stat] += addend;
  74        put_cpu();
  75}
  76#endif
  77
  78static inline struct nfs_iostats *nfs_alloc_iostats(void)
  79{
  80        return alloc_percpu(struct nfs_iostats);
  81}
  82
  83static inline void nfs_free_iostats(struct nfs_iostats *stats)
  84{
  85        if (stats != NULL)
  86                free_percpu(stats);
  87}
  88
  89#endif /* _NFS_IOSTAT */
  90