4 #include <linux/list.h>
5 #include <linux/workqueue.h>
6 #include <linux/aio_abi.h>
8 #include <asm/atomic.h>
11 #define AIO_KIOGRP_NR_ATOMIC 8
15 /* Notes on cancelling a kiocb:
16 * If a kiocb is cancelled, aio_complete may return 0 to indicate
17 * that cancel has not yet disposed of the kiocb. All cancel
18 * operations *must* call aio_put_req to dispose of the kiocb
19 * to guard against races with the completion code.
21 #define KIOCB_C_CANCELLED 0x01
22 #define KIOCB_C_COMPLETE 0x02
24 #define KIOCB_SYNC_KEY (~0U)
26 #define KIOCB_PRIVATE_SIZE (24 * sizeof(long))
31 #define KIF_CANCELLED 2
33 #define kiocbTryLock(iocb) test_and_set_bit(KIF_LOCKED, &(iocb)->ki_flags)
34 #define kiocbTryKick(iocb) test_and_set_bit(KIF_KICKED, &(iocb)->ki_flags)
36 #define kiocbSetLocked(iocb) set_bit(KIF_LOCKED, &(iocb)->ki_flags)
37 #define kiocbSetKicked(iocb) set_bit(KIF_KICKED, &(iocb)->ki_flags)
38 #define kiocbSetCancelled(iocb) set_bit(KIF_CANCELLED, &(iocb)->ki_flags)
40 #define kiocbClearLocked(iocb) clear_bit(KIF_LOCKED, &(iocb)->ki_flags)
41 #define kiocbClearKicked(iocb) clear_bit(KIF_KICKED, &(iocb)->ki_flags)
42 #define kiocbClearCancelled(iocb) clear_bit(KIF_CANCELLED, &(iocb)->ki_flags)
44 #define kiocbIsLocked(iocb) test_bit(KIF_LOCKED, &(iocb)->ki_flags)
45 #define kiocbIsKicked(iocb) test_bit(KIF_KICKED, &(iocb)->ki_flags)
46 #define kiocbIsCancelled(iocb) test_bit(KIF_CANCELLED, &(iocb)->ki_flags)
49 struct list_head ki_run_list;
52 unsigned ki_key; /* id of this request */
55 struct kioctx *ki_ctx; /* may be NULL for sync ops */
56 int (*ki_cancel)(struct kiocb *, struct io_event *);
57 long (*ki_retry)(struct kiocb *);
59 struct list_head ki_list; /* the aio core uses this
64 struct task_struct *tsk;
66 __u64 ki_user_data; /* user's data for completion */
69 char private[KIOCB_PRIVATE_SIZE];
72 #define is_sync_kiocb(iocb) ((iocb)->ki_key == KIOCB_SYNC_KEY)
73 #define init_sync_kiocb(x, filp) \
75 struct task_struct *tsk = current; \
78 (x)->ki_key = KIOCB_SYNC_KEY; \
79 (x)->ki_filp = (filp); \
80 (x)->ki_ctx = &tsk->active_mm->default_kioctx; \
81 (x)->ki_cancel = NULL; \
82 (x)->ki_obj.tsk = tsk; \
85 #define AIO_RING_MAGIC 0xa10a10a1
86 #define AIO_RING_COMPAT_FEATURES 1
87 #define AIO_RING_INCOMPAT_FEATURES 0
89 unsigned id; /* kernel internal index number */
90 unsigned nr; /* number of io_events */
95 unsigned compat_features;
96 unsigned incompat_features;
97 unsigned header_length; /* size of aio_ring */
100 struct io_event io_events[0];
101 }; /* 128 bytes + ring size */
103 #define aio_ring_avail(info, ring) (((ring)->head + (info)->nr - 1 - (ring)->tail) % (info)->nr)
105 #define AIO_RING_PAGES 8
106 struct aio_ring_info {
107 unsigned long mmap_base;
108 unsigned long mmap_size;
110 struct page **ring_pages;
111 spinlock_t ring_lock;
116 struct page *internal_pages[AIO_RING_PAGES];
122 struct mm_struct *mm;
124 /* This needs improving */
125 unsigned long user_id;
128 wait_queue_head_t wait;
133 struct list_head active_reqs; /* used for cancellation */
134 struct list_head run_list; /* used for kicked reqs */
138 struct aio_ring_info ring_info;
140 struct work_struct wq;
144 extern unsigned aio_max_size;
146 extern ssize_t FASTCALL(wait_on_sync_kiocb(struct kiocb *iocb));
147 extern int FASTCALL(aio_put_req(struct kiocb *iocb));
148 extern void FASTCALL(kick_iocb(struct kiocb *iocb));
149 extern int FASTCALL(aio_complete(struct kiocb *iocb, long res, long res2));
150 extern void FASTCALL(__put_ioctx(struct kioctx *ctx));
152 extern void FASTCALL(exit_aio(struct mm_struct *mm));
153 extern struct kioctx *lookup_ioctx(unsigned long ctx_id);
154 extern int FASTCALL(io_submit_one(struct kioctx *ctx,
155 struct iocb __user *user_iocb, struct iocb *iocb));
157 /* semi private, but used by the 32bit emulations: */
158 struct kioctx *lookup_ioctx(unsigned long ctx_id);
159 int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
162 #define get_ioctx(kioctx) do { if (unlikely(atomic_read(&(kioctx)->users) <= 0)) BUG(); atomic_inc(&(kioctx)->users); } while (0)
163 #define put_ioctx(kioctx) do { if (unlikely(atomic_dec_and_test(&(kioctx)->users))) __put_ioctx(kioctx); else if (unlikely(atomic_read(&(kioctx)->users) < 0)) BUG(); } while (0)
165 #include <linux/aio_abi.h>
167 static inline struct kiocb *list_kiocb(struct list_head *h)
169 return list_entry(h, struct kiocb, ki_list);
173 extern atomic_t aio_nr;
174 extern unsigned aio_max_nr;
176 #endif /* __LINUX__AIO_H */