async: Remove AsyncContext

The purpose of AsyncContexts was to protect qcow and qcow2 against reentrancy
during an emulated bdrv_read/write (which includes a qemu_aio_wait() call and
can run AIO callbacks of different requests if it weren't for AsyncContexts).

Now both qcow and qcow2 are protected by CoMutexes and AsyncContexts can be
removed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/block.c b/block.c
index e6abea85df..0d05b4b32d 100644
--- a/block.c
+++ b/block.c
@@ -2777,8 +2777,6 @@ static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
     struct iovec iov;
     QEMUIOVector qiov;
 
-    async_context_push();
-
     async_ret = NOT_DONE;
     iov.iov_base = (void *)buf;
     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
@@ -2796,7 +2794,6 @@ static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
 
 
 fail:
-    async_context_pop();
     return async_ret;
 }
 
@@ -2808,8 +2805,6 @@ static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
     struct iovec iov;
     QEMUIOVector qiov;
 
-    async_context_push();
-
     async_ret = NOT_DONE;
     iov.iov_base = (void *)buf;
     iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
@@ -2825,7 +2820,6 @@ static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
     }
 
 fail:
-    async_context_pop();
     return async_ret;
 }