[PULL 12/13] nbd: document what is protected by the CoMutexes

[Eric Blake <eblake@redhat.com>]

From: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220414175756.671165-10-pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Lukas Straub <lukasstraub2@web.de>
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 block/nbd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/block/nbd.c b/block/nbd.c
index 3bfcf4d97c42..6085ab1d2c13 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -81,12 +81,18 @@ typedef struct BDRVNBDState {
     NBDClientRequest requests[MAX_NBD_REQUESTS];
     QEMUTimer *reconnect_delay_timer;

+    /* Protects sending data on the socket.  */
     CoMutex send_mutex;
+
+    /*
+     * Protects receiving reply headers from the socket, as well as the
+     * fields reply and requests[].receiving
+     */
     CoMutex receive_mutex;
+    NBDReply reply;

     QEMUTimer *open_timer;

-    NBDReply reply;
     BlockDriverState *bs;

     /* Connection parameters */
-- 
2.35.1