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block: add BDS field to count in-flight requests

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Unlike tracked_requests, this field also counts throttled requests,
and remains non-zero if an AIO operation needs a BH to be "really"
completed.

With this change, it is no longer necessary to have a dummy
BdrvTrackedRequest for requests that are never serialising, and
it is no longer necessary to poll the AioContext once after
bdrv_requests_pending(bs) returns false.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1477565348-5458-5-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:48:52 +02:00 • committed by Fam Zheng
parent 9a0cec664e
commit 9972354856
3 changed files with 75 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

23
block/block-backend.c
View file

@ -799,20 +799,25 @@ int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
BdrvRequestFlags flags)
{
int ret;
BlockDriverState *bs = blk_bs(blk);
trace_blk_co_preadv(blk, blk_bs(blk), offset, bytes, flags);
trace_blk_co_preadv(blk, bs, offset, bytes, flags);
ret = blk_check_byte_request(blk, offset, bytes);
if (ret < 0) {
return ret;
}
bdrv_inc_in_flight(bs);
/* throttling disk I/O */
if (blk->public.throttle_state) {
throttle_group_co_io_limits_intercept(blk, bytes, false);
}
return bdrv_co_preadv(blk->root, offset, bytes, qiov, flags);
ret = bdrv_co_preadv(blk->root, offset, bytes, qiov, flags);
bdrv_dec_in_flight(bs);
return ret;
}
int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
@ -820,14 +825,17 @@ int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
BdrvRequestFlags flags)
{
int ret;
BlockDriverState *bs = blk_bs(blk);
trace_blk_co_pwritev(blk, blk_bs(blk), offset, bytes, flags);
trace_blk_co_pwritev(blk, bs, offset, bytes, flags);
ret = blk_check_byte_request(blk, offset, bytes);
if (ret < 0) {
return ret;
}
bdrv_inc_in_flight(bs);
/* throttling disk I/O */
if (blk->public.throttle_state) {
throttle_group_co_io_limits_intercept(blk, bytes, true);
@ -837,7 +845,9 @@ int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
flags |= BDRV_REQ_FUA;
}
return bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags);
ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags);
bdrv_dec_in_flight(bs);
return ret;
}
typedef struct BlkRwCo {
@ -930,6 +940,8 @@ int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
static void error_callback_bh(void *opaque)
{
struct BlockBackendAIOCB *acb = opaque;
bdrv_dec_in_flight(acb->common.bs);
acb->common.cb(acb->common.opaque, acb->ret);
qemu_aio_unref(acb);
}
@ -940,6 +952,7 @@ BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
{
struct BlockBackendAIOCB *acb;
bdrv_inc_in_flight(blk_bs(blk));
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
acb->blk = blk;
acb->ret = ret;
@ -962,6 +975,7 @@ static const AIOCBInfo blk_aio_em_aiocb_info = {
static void blk_aio_complete(BlkAioEmAIOCB *acb)
{
if (acb->has_returned) {
bdrv_dec_in_flight(acb->common.bs);
acb->common.cb(acb->common.opaque, acb->rwco.ret);
qemu_aio_unref(acb);
}
@ -983,6 +997,7 @@ static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes,
BlkAioEmAIOCB *acb;
Coroutine *co;
bdrv_inc_in_flight(blk_bs(blk));
acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque);
acb->rwco = (BlkRwCo) {
.blk = blk,