/*
   * Task I/O accounting operations
   */
  #ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
  #define __TASK_IO_ACCOUNTING_OPS_INCLUDED

  #include <linux/sched.h>

  #ifdef CONFIG_TASK_IO_ACCOUNTING
  static inline void task_io_account_read(size_t bytes)
  {

  	current->ioac.read_bytes += bytes;

  }

  /*
   * We approximate number of blocks, because we account bytes only.
   * A 'block' is 512 bytes
   */
  static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  {

  	return p->ioac.read_bytes >> 9;

  }

  static inline void task_io_account_write(size_t bytes)
  {

  	current->ioac.write_bytes += bytes;

  }

  /*
   * We approximate number of blocks, because we account bytes only.
   * A 'block' is 512 bytes
   */
  static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  {

  	return p->ioac.write_bytes >> 9;

  }

  static inline void task_io_account_cancelled_write(size_t bytes)
  {

  	current->ioac.cancelled_write_bytes += bytes;

  }

  static inline void task_io_accounting_init(struct task_io_accounting *ioac)

  {

  	memset(ioac, 0, sizeof(*ioac));
  }

  static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
  						struct task_io_accounting *src)

  {

  	dst->read_bytes += src->read_bytes;
  	dst->write_bytes += src->write_bytes;
  	dst->cancelled_write_bytes += src->cancelled_write_bytes;

  }
  
  #else
  
  static inline void task_io_account_read(size_t bytes)
  {
  }

  static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  {
  	return 0;
  }

  static inline void task_io_account_write(size_t bytes)
  {
  }

  static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  {
  	return 0;
  }

  static inline void task_io_account_cancelled_write(size_t bytes)
  {
  }

  static inline void task_io_accounting_init(struct task_io_accounting *ioac)

  {
  }

  static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
  						struct task_io_accounting *src)

  {
  }

  #endif /* CONFIG_TASK_IO_ACCOUNTING */
  
  #ifdef CONFIG_TASK_XACCT

  static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
  						struct task_io_accounting *src)

  {

  	dst->rchar += src->rchar;
  	dst->wchar += src->wchar;
  	dst->syscr += src->syscr;
  	dst->syscw += src->syscw;

  }
  #else

  static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
  						struct task_io_accounting *src)

  {
  }
  #endif /* CONFIG_TASK_XACCT */

  static inline void task_io_accounting_add(struct task_io_accounting *dst,
  						struct task_io_accounting *src)

  {
  	task_chr_io_accounting_add(dst, src);
  	task_blk_io_accounting_add(dst, src);
  }
  #endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */