From ef1a47ea6a0ba93345f7d7ec27583b4fa8b1f332 Mon Sep 17 00:00:00 2001
From: Abhisar Sinha <63767682+abh1sar@users.noreply.github.com>
Date: Fri, 10 Apr 2026 08:00:43 +0530
Subject: [PATCH] max writers as 1 for file backend

---
 scripts/vm/hypervisor/kvm/imageserver/handler.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/vm/hypervisor/kvm/imageserver/handler.py b/scripts/vm/hypervisor/kvm/imageserver/handler.py
index 9775e7049f9..4701a7581a9 100644
--- a/scripts/vm/hypervisor/kvm/imageserver/handler.py
+++ b/scripts/vm/hypervisor/kvm/imageserver/handler.py
@@ -216,6 +216,10 @@ class Handler(BaseHTTPRequestHandler):
         with self._registry.request_lifecycle(image_id):
             backend = create_backend(cfg)
             try:
+                max_writers = MAX_PARALLEL_WRITES
+                if not backend.supports_range_write:
+                    max_writers = 1
+
                 if not backend.supports_extents:
                     allowed_methods = "GET, PUT, POST, OPTIONS"
                     features = ["flush"]
@@ -223,7 +227,7 @@ class Handler(BaseHTTPRequestHandler):
                         "unix_socket": None,
                         "features": features,
                         "max_readers": MAX_PARALLEL_READS,
-                        "max_writers": MAX_PARALLEL_WRITES,
+                        "max_writers": max_writers,
                     }
                     self._send_json(HTTPStatus.OK, response, allowed_methods=allowed_methods)
                     return
@@ -254,7 +258,6 @@ class Handler(BaseHTTPRequestHandler):
                         features.append("zero")
                     if can_flush:
                         features.append("flush")
-                    max_writers = MAX_PARALLEL_WRITES
 
                 response = {
                     "unix_socket": None,