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block: access quiesce_counter with atomic ops 

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170605123908.18777-3-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-06-05 14:38:51 +02:00 committed by Fam Zheng
parent d3faa13e5f
commit 414c2ec358
2 changed files with 3 additions and 2 deletions
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4
block/io.c
View File

@ -241,7 +241,7 @@ void bdrv_drained_begin(BlockDriverState *bs)
return;
}
if (!bs->quiesce_counter++) {
if (atomic_fetch_inc(&bs->quiesce_counter) == 0) {
aio_disable_external(bdrv_get_aio_context(bs));
bdrv_parent_drained_begin(bs);
}
@ -252,7 +252,7 @@ void bdrv_drained_begin(BlockDriverState *bs)
void bdrv_drained_end(BlockDriverState *bs)
{
assert(bs->quiesce_counter > 0);
if (--bs->quiesce_counter > 0) {
if (atomic_fetch_dec(&bs->quiesce_counter) > 1) {
return;
}

1
include/block/block_int.h
View File

@ -637,6 +637,7 @@ struct BlockDriverState {
/* do we need to tell the quest if we have a volatile write cache? */
int enable_write_cache;
/* Accessed with atomic ops. */
int quiesce_counter;
};