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block: Nested drain_end must still call callbacks

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bdrv_do_drained_begin() restricts the call of parent callbacks and
aio_disable_external() to the outermost drain section, but the block
driver callbacks are always called. bdrv_do_drained_end() must match
this behaviour, otherwise nodes stay drained even if begin/end calls
were balanced.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2017-12-13 18:14:18 +01:00
parent 8119334918
commit 0f11516894
1 changed files with 7 additions and 5 deletions
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12
block/io.c
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@ -273,19 +273,21 @@ void bdrv_drained_begin(BlockDriverState *bs)
void bdrv_drained_end(BlockDriverState *bs)
{
int old_quiesce_counter;
if (qemu_in_coroutine()) {
bdrv_co_yield_to_drain(bs, false);
return;
}
assert(bs->quiesce_counter > 0);
if (atomic_fetch_dec(&bs->quiesce_counter) > 1) {
return;
}
old_quiesce_counter = atomic_fetch_dec(&bs->quiesce_counter);
/* Re-enable things in child-to-parent order */
bdrv_drain_invoke(bs, false, false);
bdrv_parent_drained_end(bs);
aio_enable_external(bdrv_get_aio_context(bs));
if (old_quiesce_counter == 1) {
bdrv_parent_drained_end(bs);
aio_enable_external(bdrv_get_aio_context(bs));
}
}
/*