/*
   *  BSD Process Accounting for Linux - Definitions
   *
   *  Author: Marco van Wieringen (mvw@planets.elm.net)
   *
   *  This header file contains the definitions needed to implement
   *  BSD-style process accounting. The kernel accounting code and all
   *  user-level programs that try to do something useful with the
   *  process accounting log must include this file.
   *
   *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
   *
   */

  #ifndef _LINUX_ACCT_H
  #define _LINUX_ACCT_H

  #include <uapi/linux/acct.h>

  
  #ifdef CONFIG_BSD_PROCESS_ACCT

  struct vfsmount;

  struct super_block;

  struct pacct_struct;

  struct pid_namespace;

  extern int acct_parm[]; /* for sysctl */

  extern void acct_collect(long exitcode, int group_dead);
  extern void acct_process(void);

  extern void acct_exit_ns(struct pid_namespace *);

  #else

  #define acct_collect(x,y)	do { } while (0)
  #define acct_process()		do { } while (0)

  #define acct_exit_ns(ns)	do { } while (0)

  #endif
  
  /*
   * ACCT_VERSION numbers as yet defined:
   * 0: old format (until 2.6.7) with 16 bit uid/gid
   * 1: extended variant (binary compatible on M68K)
   * 2: extended variant (binary compatible on everything except M68K)
   * 3: new binary incompatible format (64 bytes)
   * 4: new binary incompatible format (128 bytes)
   * 5: new binary incompatible format (128 bytes, second half)
   *
   */

  #undef ACCT_VERSION
  #undef AHZ

  #ifdef CONFIG_BSD_PROCESS_ACCT_V3
  #define ACCT_VERSION	3
  #define AHZ		100
  typedef struct acct_v3 acct_t;
  #else
  #ifdef CONFIG_M68K
  #define ACCT_VERSION	1
  #else
  #define ACCT_VERSION	2
  #endif
  #define AHZ		(USER_HZ)
  typedef struct acct acct_t;
  #endif

  #include <linux/jiffies.h>

  /*
   * Yet another set of HZ to *HZ helper functions.

   * See <linux/jiffies.h> for the original.

   */
  
  static inline u32 jiffies_to_AHZ(unsigned long x)
  {
  #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0

  # if HZ < AHZ
  	return x * (AHZ / HZ);
  # else

  	return x / (HZ / AHZ);

  # endif

  #else
          u64 tmp = (u64)x * TICK_NSEC;
          do_div(tmp, (NSEC_PER_SEC / AHZ));
          return (long)tmp;
  #endif
  }
  
  static inline u64 nsec_to_AHZ(u64 x)
  {
  #if (NSEC_PER_SEC % AHZ) == 0
  	do_div(x, (NSEC_PER_SEC / AHZ));
  #elif (AHZ % 512) == 0
  	x *= AHZ/512;
  	do_div(x, (NSEC_PER_SEC / 512));
  #else
  	/*
           * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
           * overflow after 64.99 years.
           * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
           */
  	x *= 9;
  	do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
  	                          / AHZ));
  #endif
  	return x;
  }

  #endif	/* _LINUX_ACCT_H */