[PATCH 11/13] block/fuse: take AioContext lock around blk_exp_ref/unref()

[Stefan Hajnoczi]

These functions must be called with the AioContext acquired:

  /* Callers must hold exp->ctx lock */
  void blk_exp_ref(BlockExport *exp)
  ...
  /* Callers must hold exp->ctx lock */
  void blk_exp_unref(BlockExport *exp)

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/export/fuse.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/export/fuse.c b/block/export/fuse.c
index 06fa41079e..18394f9e07 100644
--- a/block/export/fuse.c
+++ b/block/export/fuse.c
@@ -244,7 +244,9 @@ static void read_from_fuse_export(void *opaque)
     FuseExport *exp = opaque;
     int ret;
 
+    aio_context_acquire(exp->common.ctx);
     blk_exp_ref(&exp->common);
+    aio_context_release(exp->common.ctx);
 
     do {
         ret = fuse_session_receive_buf(exp->fuse_session, &exp->fuse_buf);
@@ -256,7 +258,9 @@ static void read_from_fuse_export(void *opaque)
     fuse_session_process_buf(exp->fuse_session, &exp->fuse_buf);
 
 out:
+    aio_context_acquire(exp->common.ctx);
     blk_exp_unref(&exp->common);
+    aio_context_release(exp->common.ctx);
 }
 
 static void fuse_export_shutdown(BlockExport *blk_exp)
-- 
2.39.2