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block/raw-win32: implement .bdrv_detach/attach_aio_context()

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Drop the assumption that we're using the main AioContext for raw-win32.
Convert the aio-win32 code to support detach/attach and replace
qemu_aio_wait() with aio_poll().

The .bdrv_detach/attach_aio_context() interfaces move the aio-win32
event notifier from the old to the new AioContext.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2014-05-08 16:34:50 +02:00
parent 99cc598924
commit 85ebd381fd
3 changed files with 46 additions and 4 deletions
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21
block/win32-aio.c
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@ -40,6 +40,7 @@ struct QEMUWin32AIOState {
HANDLE hIOCP;
EventNotifier e;
int count;
bool is_aio_context_attached;
};
typedef struct QEMUWin32AIOCB {
@ -114,7 +115,7 @@ static void win32_aio_cancel(BlockDriverAIOCB *blockacb)
* wait for completion.
*/
while (!HasOverlappedIoCompleted(&waiocb->ov)) {
qemu_aio_wait();
aio_poll(bdrv_get_aio_context(blockacb->bs), true);
}
}
@ -180,6 +181,20 @@ int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
}
}
void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
AioContext *old_context)
{
aio_set_event_notifier(old_context, &aio->e, NULL);
aio->is_aio_context_attached = false;
}
void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
AioContext *new_context)
{
aio->is_aio_context_attached = true;
aio_set_event_notifier(new_context, &aio->e, win32_aio_completion_cb);
}
QEMUWin32AIOState *win32_aio_init(void)
{
QEMUWin32AIOState *s;
@ -194,8 +209,6 @@ QEMUWin32AIOState *win32_aio_init(void)
goto out_close_efd;
}
qemu_aio_set_event_notifier(&s->e, win32_aio_completion_cb);
return s;
out_close_efd:
@ -207,7 +220,7 @@ out_free_state:
void win32_aio_cleanup(QEMUWin32AIOState *aio)
{
qemu_aio_set_event_notifier(&aio->e, NULL);
assert(!aio->is_aio_context_attached);
CloseHandle(aio->hIOCP);
event_notifier_cleanup(&aio->e);
g_free(aio);