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linux-aio: Convert laio_aiocb_info.cancel to .cancel_async

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Just call io_cancel (2), if it fails, it means the request is not
canceled, so the event loop will eventually call
qemu_laio_process_completion.

In qemu_laio_process_completion, change to call the cb unconditionally.
It is required by bdrv_aio_cancel_async.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2014-09-11 13:41:13 +08:00 committed by Stefan Hajnoczi
parent 3391f5e51c
commit 771b64daf9
1 changed files with 8 additions and 22 deletions
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30
block/linux-aio.c
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@ -85,9 +85,8 @@ static void qemu_laio_process_completion(struct qemu_laio_state *s,
ret = -EINVAL;
}
}
laiocb->common.cb(laiocb->common.opaque, ret);
}
laiocb->common.cb(laiocb->common.opaque, ret);
qemu_aio_release(laiocb);
}
@ -153,35 +152,22 @@ static void laio_cancel(BlockDriverAIOCB *blockacb)
struct io_event event;
int ret;
if (laiocb->ret != -EINPROGRESS)
if (laiocb->ret != -EINPROGRESS) {
return;
/*
* Note that as of Linux 2.6.31 neither the block device code nor any
* filesystem implements cancellation of AIO request.
* Thus the polling loop below is the normal code path.
*/
}
ret = io_cancel(laiocb->ctx->ctx, &laiocb->iocb, &event);
if (ret == 0) {
laiocb->ret = -ECANCELED;
laiocb->ret = -ECANCELED;
if (ret != 0) {
/* iocb is not cancelled, cb will be called by the event loop later */
return;
}
/*
* We have to wait for the iocb to finish.
*
* The only way to get the iocb status update is by polling the io context.
* We might be able to do this slightly more optimal by removing the
* O_NONBLOCK flag.
*/
while (laiocb->ret == -EINPROGRESS) {
qemu_laio_completion_cb(&laiocb->ctx->e);
}
laiocb->common.cb(laiocb->common.opaque, laiocb->ret);
}
static const AIOCBInfo laio_aiocb_info = {
.aiocb_size = sizeof(struct qemu_laiocb),
.cancel = laio_cancel,
.cancel_async = laio_cancel,
};
static void ioq_init(LaioQueue *io_q)