root / qemu-aio.h @ ff5928d0
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1 | a76bab49 | aliguori | /*
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2 | a76bab49 | aliguori | * QEMU aio implementation
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3 | a76bab49 | aliguori | *
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4 | a76bab49 | aliguori | * Copyright IBM, Corp. 2008
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5 | a76bab49 | aliguori | *
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6 | a76bab49 | aliguori | * Authors:
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7 | a76bab49 | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | a76bab49 | aliguori | *
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9 | a76bab49 | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | a76bab49 | aliguori | * the COPYING file in the top-level directory.
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11 | a76bab49 | aliguori | *
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12 | a76bab49 | aliguori | */
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13 | a76bab49 | aliguori | |
14 | a76bab49 | aliguori | #ifndef QEMU_AIO_H
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15 | a76bab49 | aliguori | #define QEMU_AIO_H
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16 | a76bab49 | aliguori | |
17 | a76bab49 | aliguori | #include "qemu-common.h" |
18 | a76bab49 | aliguori | #include "qemu-char.h" |
19 | a76bab49 | aliguori | |
20 | 85e8dab1 | Paolo Bonzini | typedef struct BlockDriverAIOCB BlockDriverAIOCB; |
21 | 85e8dab1 | Paolo Bonzini | typedef void BlockDriverCompletionFunc(void *opaque, int ret); |
22 | 85e8dab1 | Paolo Bonzini | |
23 | 85e8dab1 | Paolo Bonzini | typedef struct AIOPool { |
24 | 85e8dab1 | Paolo Bonzini | void (*cancel)(BlockDriverAIOCB *acb);
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25 | 85e8dab1 | Paolo Bonzini | int aiocb_size;
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26 | 85e8dab1 | Paolo Bonzini | BlockDriverAIOCB *free_aiocb; |
27 | 85e8dab1 | Paolo Bonzini | } AIOPool; |
28 | 85e8dab1 | Paolo Bonzini | |
29 | 85e8dab1 | Paolo Bonzini | struct BlockDriverAIOCB {
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30 | 85e8dab1 | Paolo Bonzini | AIOPool *pool; |
31 | 85e8dab1 | Paolo Bonzini | BlockDriverState *bs; |
32 | 85e8dab1 | Paolo Bonzini | BlockDriverCompletionFunc *cb; |
33 | 85e8dab1 | Paolo Bonzini | void *opaque;
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34 | 85e8dab1 | Paolo Bonzini | BlockDriverAIOCB *next; |
35 | 85e8dab1 | Paolo Bonzini | }; |
36 | 85e8dab1 | Paolo Bonzini | |
37 | 85e8dab1 | Paolo Bonzini | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
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38 | 85e8dab1 | Paolo Bonzini | BlockDriverCompletionFunc *cb, void *opaque);
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39 | 85e8dab1 | Paolo Bonzini | void qemu_aio_release(void *p); |
40 | 85e8dab1 | Paolo Bonzini | |
41 | a76bab49 | aliguori | /* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
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42 | a76bab49 | aliguori | typedef int (AioFlushHandler)(void *opaque); |
43 | a76bab49 | aliguori | |
44 | a76bab49 | aliguori | /* Flush any pending AIO operation. This function will block until all
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45 | a76bab49 | aliguori | * outstanding AIO operations have been completed or cancelled. */
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46 | a76bab49 | aliguori | void qemu_aio_flush(void); |
47 | a76bab49 | aliguori | |
48 | 986c28d6 | Andrea Arcangeli | /* Wait for a single AIO completion to occur. This function will wait
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49 | 986c28d6 | Andrea Arcangeli | * until a single AIO event has completed and it will ensure something
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50 | 986c28d6 | Andrea Arcangeli | * has moved before returning. This can issue new pending aio as
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51 | bcdc1857 | Paolo Bonzini | * result of executing I/O completion or bh callbacks.
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52 | bcdc1857 | Paolo Bonzini | *
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53 | bcdc1857 | Paolo Bonzini | * Return whether there is still any pending AIO operation. */
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54 | bcdc1857 | Paolo Bonzini | bool qemu_aio_wait(void); |
55 | a76bab49 | aliguori | |
56 | a76bab49 | aliguori | /* Register a file descriptor and associated callbacks. Behaves very similarly
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57 | a76bab49 | aliguori | * to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
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58 | a76bab49 | aliguori | * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
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59 | a76bab49 | aliguori | *
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60 | a76bab49 | aliguori | * Code that invokes AIO completion functions should rely on this function
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61 | a76bab49 | aliguori | * instead of qemu_set_fd_handler[2].
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62 | a76bab49 | aliguori | */
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63 | a76bab49 | aliguori | int qemu_aio_set_fd_handler(int fd, |
64 | a76bab49 | aliguori | IOHandler *io_read, |
65 | a76bab49 | aliguori | IOHandler *io_write, |
66 | a76bab49 | aliguori | AioFlushHandler *io_flush, |
67 | a76bab49 | aliguori | void *opaque);
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68 | a76bab49 | aliguori | |
69 | a76bab49 | aliguori | #endif |