release/src-rt-6.x.4708/linux/linux-2.6.36/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         this_cpu_inc(server->io_stats->events[stat]);
  29 }
  30
  31 static inline void nfs_inc_stats(const struct inode *inode,
  32                                  enum nfs_stat_eventcounters stat)
  33 {
  34         nfs_inc_server_stats(NFS_SERVER(inode), stat);
  35 }
  36
  37 static inline void nfs_add_server_stats(const struct nfs_server *server,
  38                                         enum nfs_stat_bytecounters stat,
  39                                         long addend)
  40 {
  41         this_cpu_add(server->io_stats->bytes[stat], addend);
  42 }
  43
  44 static inline void nfs_add_stats(const struct inode *inode,
  45                                  enum nfs_stat_bytecounters stat,
  46                                  long addend)
  47 {
  48         nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
  49 }
  50
  51 #ifdef CONFIG_NFS_FSCACHE
  52 static inline void nfs_add_fscache_stats(struct inode *inode,
  53                                          enum nfs_stat_fscachecounters stat,
  54                                          long addend)
  55 {
  56         this_cpu_add(NFS_SERVER(inode)->io_stats->fscache[stat], addend);
  57 }
  58 #endif
  59
  60 static inline struct nfs_iostats __percpu *nfs_alloc_iostats(void)
  61 {
  62         return alloc_percpu(struct nfs_iostats);
  63 }
  64
  65 static inline void nfs_free_iostats(struct nfs_iostats __percpu *stats)
  66 {
  67         if (stats != NULL)
  68                 free_percpu(stats);
  69 }
  70
  71 #endif /* _NFS_IOSTAT */