include/linux/aio.h

   1 #ifndef __LINUX__AIO_H
   2 #define __LINUX__AIO_H
   3
   4 #include <linux/list.h>
   5 #include <linux/workqueue.h>
   6 #include <linux/aio_abi.h>
   7 #include <linux/uio.h>
   8 #include <linux/rcupdate.h>
   9
  10 #include <linux/atomic.h>
  11
  12 struct kioctx;
  13 struct kiocb;
  14
  15 #define KIOCB_KEY               0
  16
  17 typedef int (kiocb_cancel_fn)(struct kiocb *);
  18
  19 #define IOCB_EVENTFD            (1 << 0)
  20
  21 struct kiocb {
  22         struct file             *ki_filp;
  23         loff_t                  ki_pos;
  24         void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
  25         void                    *private;
  26         int                     ki_flags;
  27 };
  28
  29 static inline bool is_sync_kiocb(struct kiocb *kiocb)
  30 {
  31         return kiocb->ki_complete == NULL;
  32 }
  33
  34 static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
  35 {
  36         *kiocb = (struct kiocb) {
  37                         .ki_filp = filp,
  38                 };
  39 }
  40
  41 /* prototypes */
  42 #ifdef CONFIG_AIO
  43 struct mm_struct;
  44 extern void exit_aio(struct mm_struct *mm);
  45 extern long do_io_submit(aio_context_t ctx_id, long nr,
  46                          struct iocb __user *__user *iocbpp, bool compat);
  47 void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
  48 #else
  49 struct mm_struct;
  50 static inline void exit_aio(struct mm_struct *mm) { }
  51 static inline long do_io_submit(aio_context_t ctx_id, long nr,
  52                                 struct iocb __user * __user *iocbpp,
  53                                 bool compat) { return 0; }
  54 static inline void kiocb_set_cancel_fn(struct kiocb *req,
  55                                        kiocb_cancel_fn *cancel) { }
  56 #endif /* CONFIG_AIO */
  57
  58 /* for sysctl: */
  59 extern unsigned long aio_nr;
  60 extern unsigned long aio_max_nr;
  61
  62 #endif /* __LINUX__AIO_H */