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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __LINUX__AIO_H |
| 2 | #define __LINUX__AIO_H |
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| 3 | |||
| 4 | #include <linux/list.h> |
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| 5 | #include <linux/workqueue.h> |
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| 6 | #include <linux/aio_abi.h> |
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| 7 | |||
| 8 | #include <asm/atomic.h> |
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| 9 | |||
| 10 | #define AIO_MAXSEGS 4 |
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| 11 | #define AIO_KIOGRP_NR_ATOMIC 8 |
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| 12 | |||
| 13 | struct kioctx; |
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| 14 | |||
| 15 | /* Notes on cancelling a kiocb: |
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| 16 | * If a kiocb is cancelled, aio_complete may return 0 to indicate |
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| 17 | * that cancel has not yet disposed of the kiocb. All cancel |
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| 18 | * operations *must* call aio_put_req to dispose of the kiocb |
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| 19 | * to guard against races with the completion code. |
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| 20 | */ |
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| 21 | #define KIOCB_C_CANCELLED 0x01 |
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| 22 | #define KIOCB_C_COMPLETE 0x02 |
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| 23 | |||
| 24 | #define KIOCB_SYNC_KEY (~0U) |
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| 25 | |||
| 26 | #define KIOCB_PRIVATE_SIZE (24 * sizeof(long)) |
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| 27 | |||
| 28 | /* ki_flags bits */ |
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| 29 | #define KIF_LOCKED 0 |
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| 30 | #define KIF_KICKED 1 |
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| 31 | #define KIF_CANCELLED 2 |
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| 32 | |||
| 33 | #define kiocbTryLock(iocb) test_and_set_bit(KIF_LOCKED, &(iocb)->ki_flags) |
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| 34 | #define kiocbTryKick(iocb) test_and_set_bit(KIF_KICKED, &(iocb)->ki_flags) |
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| 35 | |||
| 36 | #define kiocbSetLocked(iocb) set_bit(KIF_LOCKED, &(iocb)->ki_flags) |
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| 37 | #define kiocbSetKicked(iocb) set_bit(KIF_KICKED, &(iocb)->ki_flags) |
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| 38 | #define kiocbSetCancelled(iocb) set_bit(KIF_CANCELLED, &(iocb)->ki_flags) |
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| 39 | |||
| 40 | #define kiocbClearLocked(iocb) clear_bit(KIF_LOCKED, &(iocb)->ki_flags) |
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| 41 | #define kiocbClearKicked(iocb) clear_bit(KIF_KICKED, &(iocb)->ki_flags) |
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| 42 | #define kiocbClearCancelled(iocb) clear_bit(KIF_CANCELLED, &(iocb)->ki_flags) |
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| 43 | |||
| 44 | #define kiocbIsLocked(iocb) test_bit(KIF_LOCKED, &(iocb)->ki_flags) |
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| 45 | #define kiocbIsKicked(iocb) test_bit(KIF_KICKED, &(iocb)->ki_flags) |
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| 46 | #define kiocbIsCancelled(iocb) test_bit(KIF_CANCELLED, &(iocb)->ki_flags) |
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| 47 | |||
| 48 | struct kiocb { |
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| 49 | struct list_head ki_run_list; |
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| 50 | long ki_flags; |
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| 51 | int ki_users; |
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| 52 | unsigned ki_key; /* id of this request */ |
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| 53 | |||
| 54 | struct file *ki_filp; |
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| 55 | struct kioctx *ki_ctx; /* may be NULL for sync ops */ |
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| 56 | int (*ki_cancel)(struct kiocb *, struct io_event *); |
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| 57 | long (*ki_retry)(struct kiocb *); |
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| 58 | |||
| 59 | struct list_head ki_list; /* the aio core uses this |
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| 60 | * for cancellation */ |
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| 61 | |||
| 62 | void *ki_user_obj; /* pointer to userland's iocb */ |
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| 63 | __u64 ki_user_data; /* user's data for completion */ |
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| 64 | loff_t ki_pos; |
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| 65 | |||
| 66 | char private[KIOCB_PRIVATE_SIZE]; |
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| 67 | }; |
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| 68 | |||
| 69 | #define is_sync_kiocb(iocb) ((iocb)->ki_key == KIOCB_SYNC_KEY) |
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| 70 | #define init_sync_kiocb(x, filp) \ |
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| 71 | do { \ |
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| 72 | struct task_struct *tsk = current; \ |
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| 73 | (x)->ki_flags = 0; \ |
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| 74 | (x)->ki_users = 1; \ |
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| 75 | (x)->ki_key = KIOCB_SYNC_KEY; \ |
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| 76 | (x)->ki_filp = (filp); \ |
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| 77 | (x)->ki_ctx = &tsk->active_mm->default_kioctx; \ |
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| 78 | (x)->ki_cancel = NULL; \ |
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| 79 | (x)->ki_user_obj = tsk; \ |
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| 80 | } while (0) |
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| 81 | |||
| 82 | #define AIO_RING_MAGIC 0xa10a10a1 |
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| 83 | #define AIO_RING_COMPAT_FEATURES 1 |
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| 84 | #define AIO_RING_INCOMPAT_FEATURES 0 |
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| 85 | struct aio_ring { |
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| 86 | unsigned id; /* kernel internal index number */ |
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| 87 | unsigned nr; /* number of io_events */ |
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| 88 | unsigned head; |
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| 89 | unsigned tail; |
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| 90 | |||
| 91 | unsigned magic; |
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| 92 | unsigned compat_features; |
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| 93 | unsigned incompat_features; |
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| 94 | unsigned header_length; /* size of aio_ring */ |
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| 95 | |||
| 96 | |||
| 97 | struct io_event io_events[0]; |
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| 98 | }; /* 128 bytes + ring size */ |
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| 99 | |||
| 100 | #define aio_ring_avail(info, ring) (((ring)->head + (info)->nr - 1 - (ring)->tail) % (info)->nr) |
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| 101 | |||
| 102 | #define AIO_RING_PAGES 8 |
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| 103 | struct aio_ring_info { |
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| 104 | unsigned long mmap_base; |
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| 105 | unsigned long mmap_size; |
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| 106 | |||
| 107 | struct page **ring_pages; |
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| 108 | spinlock_t ring_lock; |
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| 109 | long nr_pages; |
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| 110 | |||
| 111 | unsigned nr, tail; |
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| 112 | |||
| 113 | struct page *internal_pages[AIO_RING_PAGES]; |
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| 114 | }; |
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| 115 | |||
| 116 | struct kioctx { |
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| 117 | atomic_t users; |
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| 118 | int dead; |
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| 119 | struct mm_struct *mm; |
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| 120 | |||
| 121 | /* This needs improving */ |
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| 122 | unsigned long user_id; |
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| 123 | struct kioctx *next; |
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| 124 | |||
| 125 | wait_queue_head_t wait; |
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| 126 | |||
| 127 | spinlock_t ctx_lock; |
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| 128 | |||
| 129 | int reqs_active; |
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| 130 | struct list_head active_reqs; /* used for cancellation */ |
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| 131 | struct list_head run_list; /* used for kicked reqs */ |
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| 132 | |||
| 133 | unsigned max_reqs; |
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| 134 | |||
| 135 | struct aio_ring_info ring_info; |
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| 136 | |||
| 137 | struct work_struct wq; |
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| 138 | }; |
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| 139 | |||
| 140 | /* prototypes */ |
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| 141 | extern unsigned aio_max_size; |
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| 142 | |||
| 143 | extern ssize_t FASTCALL(wait_on_sync_kiocb(struct kiocb *iocb)); |
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| 144 | extern int FASTCALL(aio_put_req(struct kiocb *iocb)); |
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| 145 | extern void FASTCALL(kick_iocb(struct kiocb *iocb)); |
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| 146 | extern int FASTCALL(aio_complete(struct kiocb *iocb, long res, long res2)); |
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| 147 | extern void FASTCALL(__put_ioctx(struct kioctx *ctx)); |
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| 148 | struct mm_struct; |
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| 149 | extern void FASTCALL(exit_aio(struct mm_struct *mm)); |
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| 150 | extern struct kioctx *lookup_ioctx(unsigned long ctx_id); |
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| 151 | extern int FASTCALL(io_submit_one(struct kioctx *ctx, |
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| 152 | struct iocb *user_iocb, struct iocb *iocb)); |
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| 153 | |||
| 154 | /* semi private, but used by the 32bit emulations: */ |
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| 155 | struct kioctx *lookup_ioctx(unsigned long ctx_id); |
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| 156 | int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb *user_iocb, |
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| 157 | struct iocb *iocb)); |
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| 158 | |||
| 159 | #define get_ioctx(kioctx) do { if (unlikely(atomic_read(&(kioctx)->users) <= 0)) BUG(); atomic_inc(&(kioctx)->users); } while (0) |
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| 160 | #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) |
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| 161 | |||
| 162 | #include <linux/aio_abi.h> |
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| 163 | |||
| 164 | static inline struct kiocb *list_kiocb(struct list_head *h) |
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| 165 | { |
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| 166 | return list_entry(h, struct kiocb, ki_list); |
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| 167 | } |
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| 168 | |||
| 169 | /* for sysctl: */ |
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| 170 | extern unsigned aio_max_nr, aio_max_size, aio_max_pinned; |
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| 171 | |||
| 172 | #endif /* __LINUX__AIO_H */ |