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 *);
36 struct kioctx *ki_ctx; /* NULL for sync ops */
37 kiocb_cancel_fn *ki_cancel;
38 void (*ki_dtor)(struct kiocb *);
42 struct task_struct *tsk;
45 __u64 ki_user_data; /* user's data for completion */
49 /* State that we remember to be able to restart/retry */
50 unsigned short ki_opcode;
51 size_t ki_nbytes; /* copy of iocb->aio_nbytes */
52 char __user *ki_buf; /* remaining iocb->aio_buf */
53 struct iovec ki_inline_vec; /* inline vector */
54 struct iovec *ki_iovec;
55 unsigned long ki_nr_segs;
57 struct list_head ki_list; /* the aio core uses this
61 * If the aio_resfd field of the userspace iocb is not zero,
62 * this is the underlying eventfd context to deliver events to.
64 struct eventfd_ctx *ki_eventfd;
67 static inline bool is_sync_kiocb(struct kiocb *kiocb)
69 return kiocb->ki_ctx == NULL;
72 static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
74 *kiocb = (struct kiocb) {
75 .ki_users = ATOMIC_INIT(1),
78 .ki_obj.tsk = current,
84 extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb);
85 extern void aio_put_req(struct kiocb *iocb);
86 extern void aio_complete(struct kiocb *iocb, long res, long res2);
88 extern void exit_aio(struct mm_struct *mm);
89 extern long do_io_submit(aio_context_t ctx_id, long nr,
90 struct iocb __user *__user *iocbpp, bool compat);
91 void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
93 static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; }
94 static inline void aio_put_req(struct kiocb *iocb) { }
95 static inline void aio_complete(struct kiocb *iocb, long res, long res2) { }
97 static inline void exit_aio(struct mm_struct *mm) { }
98 static inline long do_io_submit(aio_context_t ctx_id, long nr,
99 struct iocb __user * __user *iocbpp,
100 bool compat) { return 0; }
101 static inline void kiocb_set_cancel_fn(struct kiocb *req,
102 kiocb_cancel_fn *cancel) { }
103 #endif /* CONFIG_AIO */
105 static inline struct kiocb *list_kiocb(struct list_head *h)
107 return list_entry(h, struct kiocb, ki_list);
111 extern unsigned long aio_nr;
112 extern unsigned long aio_max_nr;
114 #endif /* __LINUX__AIO_H */