From d9b88f7e0d56feb4d7daa2506e2756fc48e975a1 Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Fri, 1 Nov 2019 16:25:09 +0100
Subject: [PATCH] block: Add bdrv_co_get_self_request()

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20191101152510.11719-3-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit c28107e9e55b11cd35cf3dc2505e3e69d10dcf13)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 block/io.c                | 18 ++++++++++++++++++
 include/block/block_int.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/block/io.c b/block/io.c
index d4ceaaa2ce..65b5102714 100644
--- a/block/io.c
+++ b/block/io.c
@@ -721,6 +721,24 @@ static bool is_request_serialising_and_aligned(BdrvTrackedRequest *req)
            (req->bytes == req->overlap_bytes);
 }
 
+/**
+ * Return the tracked request on @bs for the current coroutine, or
+ * NULL if there is none.
+ */
+BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs)
+{
+    BdrvTrackedRequest *req;
+    Coroutine *self = qemu_coroutine_self();
+
+    QLIST_FOREACH(req, &bs->tracked_requests, list) {
+        if (req->co == self) {
+            return req;
+        }
+    }
+
+    return NULL;
+}
+
 /**
  * Round a region to cluster boundaries
  */
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 4465b02242..05ee6b4866 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -964,6 +964,7 @@ void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent);
 
 bool coroutine_fn bdrv_wait_serialising_requests(BdrvTrackedRequest *self);
 void bdrv_mark_request_serialising(BdrvTrackedRequest *req, uint64_t align);
+BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs);
 
 int get_tmp_filename(char *filename, int size);
 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
-- 
2.23.0