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