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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 | /* |
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 |
21 | * userspace). |
22 | * |
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(). |
27 | */ |
28 | #define KIOCB_CANCELLED ((void *) (~0ULL)) |
29 | |
30 | typedef int (kiocb_cancel_fn)(struct kiocb *); |
31 | |
32 | struct kiocb { |
33 | struct file *ki_filp; |
34 | struct kioctx *ki_ctx; /* NULL for sync ops */ |
35 | kiocb_cancel_fn *ki_cancel; |
36 | void *private; |
37 | |
38 | union { |
39 | void __user *user; |
40 | struct task_struct *tsk; |
41 | } ki_obj; |
42 | |
43 | __u64 ki_user_data; /* user's data for completion */ |
44 | loff_t ki_pos; |
45 | size_t ki_nbytes; /* copy of iocb->aio_nbytes */ |
46 | |
47 | struct list_head ki_list; /* the aio core uses this |
48 | * for cancellation */ |
49 | |
50 | /* |
51 | * If the aio_resfd field of the userspace iocb is not zero, |
52 | * this is the underlying eventfd context to deliver events to. |
53 | */ |
54 | struct eventfd_ctx *ki_eventfd; |
55 | }; |
56 | |
57 | static inline bool is_sync_kiocb(struct kiocb *kiocb) |
58 | { |
59 | return kiocb->ki_ctx == NULL; |
60 | } |
61 | |
62 | static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp) |
63 | { |
64 | *kiocb = (struct kiocb) { |
65 | .ki_ctx = NULL, |
66 | .ki_filp = filp, |
67 | .ki_obj.tsk = current, |
68 | }; |
69 | } |
70 | |
71 | /* prototypes */ |
72 | #ifdef CONFIG_AIO |
73 | extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb); |
74 | extern void aio_complete(struct kiocb *iocb, long res, long res2); |
75 | struct mm_struct; |
76 | extern void exit_aio(struct mm_struct *mm); |
77 | extern long do_io_submit(aio_context_t ctx_id, long nr, |
78 | struct iocb __user *__user *iocbpp, bool compat); |
79 | void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel); |
80 | #else |
81 | static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; } |
82 | static inline void aio_complete(struct kiocb *iocb, long res, long res2) { } |
83 | struct mm_struct; |
84 | static inline void exit_aio(struct mm_struct *mm) { } |
85 | static inline long do_io_submit(aio_context_t ctx_id, long nr, |
86 | struct iocb __user * __user *iocbpp, |
87 | bool compat) { return 0; } |
88 | static inline void kiocb_set_cancel_fn(struct kiocb *req, |
89 | kiocb_cancel_fn *cancel) { } |
90 | #endif /* CONFIG_AIO */ |
91 | |
92 | static inline struct kiocb *list_kiocb(struct list_head *h) |
93 | { |
94 | return list_entry(h, struct kiocb, ki_list); |
95 | } |
96 | |
97 | /* for sysctl: */ |
98 | extern unsigned long aio_nr; |
99 | extern unsigned long aio_max_nr; |
100 | |
101 | #endif /* __LINUX__AIO_H */ |
102 |
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