include/linux/task_io_accounting_ops.h

   1 /*
   2  * Task I/O accounting operations
   3  */
   4 #ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
   5 #define __TASK_IO_ACCOUNTING_OPS_INCLUDED
   6
   7 #ifdef CONFIG_TASK_IO_ACCOUNTING
   8 static inline void task_io_account_read(size_t bytes)
   9 {
  10         current->ioac.read_bytes += bytes;
  11 }
  12
  13 /*
  14  * We approximate number of blocks, because we account bytes only.
  15  * A 'block' is 512 bytes
  16  */
  17 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  18 {
  19         return p->ioac.read_bytes >> 9;
  20 }
  21
  22 static inline void task_io_account_write(size_t bytes)
  23 {
  24         current->ioac.write_bytes += bytes;
  25 }
  26
  27 /*
  28  * We approximate number of blocks, because we account bytes only.
  29  * A 'block' is 512 bytes
  30  */
  31 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  32 {
  33         return p->ioac.write_bytes >> 9;
  34 }
  35
  36 static inline void task_io_account_cancelled_write(size_t bytes)
  37 {
  38         current->ioac.cancelled_write_bytes += bytes;
  39 }
  40
  41 static inline void task_io_accounting_init(struct task_struct *tsk)
  42 {
  43         memset(&tsk->ioac, 0, sizeof(tsk->ioac));
  44 }
  45
  46 #else
  47
  48 static inline void task_io_account_read(size_t bytes)
  49 {
  50 }
  51
  52 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  53 {
  54         return 0;
  55 }
  56
  57 static inline void task_io_account_write(size_t bytes)
  58 {
  59 }
  60
  61 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  62 {
  63         return 0;
  64 }
  65
  66 static inline void task_io_account_cancelled_write(size_t bytes)
  67 {
  68 }
  69
  70 static inline void task_io_accounting_init(struct task_struct *tsk)
  71 {
  72 }
  73
  74 #endif          /* CONFIG_TASK_IO_ACCOUNTING */
  75 #endif          /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */