f8516430490da60cb49b65b88c4ef57afae132f6
4 #include <linux/list.h>
5 #include <linux/workqueue.h>
6 #include <linux/aio_abi.h>
8 #include <linux/rcupdate.h>
10 #include <linux/atomic.h>
18 * We use ki_cancel == KIOCB_CANCELLED to indicate that a kiocb has been either
19 * cancelled or completed (this makes a certain amount of sense because
20 * successful cancellation - io_cancel() - does deliver the completion to
23 * And since most things don't implement kiocb cancellation and we'd really like
24 * kiocb completion to be lockless when possible, we use ki_cancel to
25 * synchronize cancellation and completion - we only set it to KIOCB_CANCELLED
26 * with xchg() or cmpxchg(), see batch_complete_aio() and kiocb_cancel().
28 #define KIOCB_CANCELLED ((void *) (~0ULL))
30 typedef int (kiocb_cancel_fn
)(struct kiocb
*);
34 struct kioctx
*ki_ctx
; /* NULL for sync ops */
35 kiocb_cancel_fn
*ki_cancel
;
42 __u64 ki_user_data
; /* user's data for completion */
45 struct list_head ki_list
; /* the aio core uses this
49 * If the aio_resfd field of the userspace iocb is not zero,
50 * this is the underlying eventfd context to deliver events to.
52 struct eventfd_ctx
*ki_eventfd
;
55 static inline bool is_sync_kiocb(struct kiocb
*kiocb
)
57 return kiocb
->ki_ctx
== NULL
;
60 static inline void init_sync_kiocb(struct kiocb
*kiocb
, struct file
*filp
)
62 *kiocb
= (struct kiocb
) {
70 extern void aio_complete(struct kiocb
*iocb
, long res
, long res2
);
72 extern void exit_aio(struct mm_struct
*mm
);
73 extern long do_io_submit(aio_context_t ctx_id
, long nr
,
74 struct iocb __user
*__user
*iocbpp
, bool compat
);
75 void kiocb_set_cancel_fn(struct kiocb
*req
, kiocb_cancel_fn
*cancel
);
77 static inline void aio_complete(struct kiocb
*iocb
, long res
, long res2
) { }
79 static inline void exit_aio(struct mm_struct
*mm
) { }
80 static inline long do_io_submit(aio_context_t ctx_id
, long nr
,
81 struct iocb __user
* __user
*iocbpp
,
82 bool compat
) { return 0; }
83 static inline void kiocb_set_cancel_fn(struct kiocb
*req
,
84 kiocb_cancel_fn
*cancel
) { }
85 #endif /* CONFIG_AIO */
87 static inline struct kiocb
*list_kiocb(struct list_head
*h
)
89 return list_entry(h
, struct kiocb
, ki_list
);
93 extern unsigned long aio_nr
;
94 extern unsigned long aio_max_nr
;
96 #endif /* __LINUX__AIO_H */
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