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From 27fd652033779a16561160bef8aeda7f8f9c04be Mon Sep 17 00:00:00 2001
From: Kevin Wolf <>
Date: Wed, 10 Oct 2018 20:22:05 +0100
Subject: [PATCH 39/49] block-backend: Decrease in_flight only after callback

RH-Author: Kevin Wolf <>
Message-id: <>
Patchwork-id: 82617
O-Subject: [RHEL-8 qemu-kvm PATCH 36/44] block-backend: Decrease in_flight only after callback
Bugzilla: 1637976
RH-Acked-by: Max Reitz <>
RH-Acked-by: John Snow <>
RH-Acked-by: Thomas Huth <>

Request callbacks can do pretty much anything, including operations that
will yield from the coroutine (such as draining the backend). In that
case, a decreased in_flight would be visible to other code and could
lead to a drain completing while the callback hasn't actually completed

Note that reordering these operations forbids calling drain directly
inside an AIO callback. As Paolo explains, indirectly calling it is

- Calling it through a coroutine is okay, because then
  bdrv_drained_begin() goes through bdrv_co_yield_to_drain() and you
  have in_flight=2 when bdrv_co_yield_to_drain() yields, then soon
  in_flight=1 when the aio_co_wake() in the AIO callback completes, then
  in_flight=0 after the bottom half starts.

- Calling it through a bottom half would be okay too, as long as the AIO
  callback remembers to do inc_in_flight/dec_in_flight just like
  bdrv_co_yield_to_drain() and bdrv_co_drain_bh_cb() do

A few more important cases that come to mind:

- A coroutine that yields because of I/O is okay, with a sequence
  similar to bdrv_co_yield_to_drain().

- A coroutine that yields with no I/O pending will correctly decrease
  in_flight to zero before yielding.

- Calling more AIO from the callback won't overflow the counter just
  because of mutual recursion, because AIO functions always yield at
  least once before invoking the callback.

Signed-off-by: Kevin Wolf <>
Reviewed-by: Fam Zheng <>
Reviewed-by: Max Reitz <>
Reviewed-by: Paolo Bonzini <>
(cherry picked from commit 46aaf2a566e364a62315219255099cbf1c9b990d)
Signed-off-by: Kevin Wolf <>
Signed-off-by: Danilo C. L. de Paula <>
 block/block-backend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index bfd0331..b8ea286 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1341,8 +1341,8 @@ static const AIOCBInfo blk_aio_em_aiocb_info = {
 static void blk_aio_complete(BlkAioEmAIOCB *acb)
     if (acb->has_returned) {
-        blk_dec_in_flight(acb->rwco.blk);
         acb->common.cb(acb->common.opaque, acb->rwco.ret);
+        blk_dec_in_flight(acb->rwco.blk);