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>

2 files changed, 0 insertions, 18 deletions

diff --git a/block/qed-table.c b/block/qed-table.c
index d38c673547..d96afa81d7 100644
--- a/block/qed-table.c
+++ b/block/qed-table.c
@@ -179,16 +179,12 @@ int qed_read_l1_table_sync(BDRVQEDState *s)
 {
     int ret = -EINPROGRESS;
 
-    async_context_push();
-
     qed_read_table(s, s->header.l1_table_offset,
                    s->l1_table, qed_sync_cb, &ret);
     while (ret == -EINPROGRESS) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
-
     return ret;
 }
 
@@ -205,15 +201,11 @@ int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index,
 {
     int ret = -EINPROGRESS;
 
-    async_context_push();
-
     qed_write_l1_table(s, index, n, qed_sync_cb, &ret);
     while (ret == -EINPROGRESS) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
-
     return ret;
 }
 
@@ -282,14 +274,11 @@ int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset
 {
     int ret = -EINPROGRESS;
 
-    async_context_push();
-
     qed_read_l2_table(s, request, offset, qed_sync_cb, &ret);
     while (ret == -EINPROGRESS) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
     return ret;
 }
 
@@ -307,13 +296,10 @@ int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request,
 {
     int ret = -EINPROGRESS;
 
-    async_context_push();
-
     qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret);
     while (ret == -EINPROGRESS) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
     return ret;
 }
diff --git a/block/qed.c b/block/qed.c
index 39703793e9..333f067582 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -680,16 +680,12 @@ static int bdrv_qed_is_allocated(BlockDriverState *bs, int64_t sector_num,
     };
     QEDRequest request = { .l2_table = NULL };
 
-    async_context_push();
-
     qed_find_cluster(s, &request, pos, len, qed_is_allocated_cb, &cb);
 
     while (cb.is_allocated == -1) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
-
     qed_unref_l2_cache_entry(request.l2_table);
 
     return cb.is_allocated;