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 #ifdef CONFIG_NFS_FSCACHE
  20         unsigned long long      fscache[__NFSIOS_FSCACHEMAX];
  21 #endif
  22         unsigned long           events[__NFSIOS_COUNTSMAX];
  23 } ____cacheline_aligned;
  24
  25 static 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_no_resched();
  35 }
  36
  37 static 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
  43 static 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_no_resched();
  54 }
  55
  56 static 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
  64 static 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_no_resched();
  75 }
  76 #endif
  77
  78 static inline struct nfs_iostats *nfs_alloc_iostats(void)
  79 {
  80         return alloc_percpu(struct nfs_iostats);
  81 }
  82
  83 static inline void nfs_free_iostats(struct nfs_iostats *stats)
  84 {
  85         if (stats != NULL)
  86                 free_percpu(stats);
  87 }
  88
  89 #endif /* _NFS_IOSTAT */