nbd: document what is protected by the CoMutexes

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>

diff --git a/block/nbd.c b/block/nbd.c
index 3bfcf4d97c421ae8188df1311125a1d47879370c..6085ab1d2c131685a761bf439be5e56890fc669a 100644 (file)
--- 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 */