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
  17 struct nfs_iostats {
  18         unsigned long long      bytes[__NFSIOS_BYTESMAX];
  19         unsigned long           events[__NFSIOS_COUNTSMAX];
  20 } ____cacheline_aligned;
  21
  22 static inline void nfs_inc_server_stats(const struct nfs_server *server,
  23                                         enum nfs_stat_eventcounters stat)
  24 {
  25         struct nfs_iostats *iostats;
  26         int cpu;
  27
  28         cpu = get_cpu();
  29         iostats = per_cpu_ptr(server->io_stats, cpu);
  30         iostats->events[stat]++;
  31         put_cpu_no_resched();
  32 }
  33
  34 static inline void nfs_inc_stats(const struct inode *inode,
  35                                  enum nfs_stat_eventcounters stat)
  36 {
  37         nfs_inc_server_stats(NFS_SERVER(inode), stat);
  38 }
  39
  40 static inline void nfs_add_server_stats(const struct nfs_server *server,
  41                                         enum nfs_stat_bytecounters stat,
  42                                         unsigned long addend)
  43 {
  44         struct nfs_iostats *iostats;
  45         int cpu;
  46
  47         cpu = get_cpu();
  48         iostats = per_cpu_ptr(server->io_stats, cpu);
  49         iostats->bytes[stat] += addend;
  50         put_cpu_no_resched();
  51 }
  52
  53 static inline void nfs_add_stats(const struct inode *inode,
  54                                  enum nfs_stat_bytecounters stat,
  55                                  unsigned long addend)
  56 {
  57         nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
  58 }
  59
  60 static inline struct nfs_iostats *nfs_alloc_iostats(void)
  61 {
  62         return alloc_percpu(struct nfs_iostats);
  63 }
  64
  65 static inline void nfs_free_iostats(struct nfs_iostats *stats)
  66 {
  67         if (stats != NULL)
  68                 free_percpu(stats);
  69 }
  70
  71 #endif /* _NFS_IOSTAT */