From 48398d9b96fa334e8c0e626d99cf2df8f4a5c664 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 23 Oct 2014 10:10:11 +0200
Subject: [PATCH 08/19] block: Catch duplicate IDs in bdrv_new()

Message-id: <1414059011-15516-9-git-send-email-kwolf@redhat.com>
Patchwork-id: 61840
O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 8/8] block: Catch duplicate IDs in bdrv_new()
Bugzilla: 1088176
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>

Since commit f298d071, block devices added with blockdev-add don't have
a QemuOpts around in dinfo->opts. Consequently, we can't rely any more
on QemuOpts catching duplicate IDs for block devices.

This patch adds a new check for duplicate IDs to bdrv_new(), and moves
the existing check that the ID isn't already taken for a node-name there
as well.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit f2d953ec31eeeb3029ca915a55938c538a14efa8)

In RHEL 7, node names don't exist yet, so only check the ID.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block.c                    |  6 ++++++
 tests/qemu-iotests/087     | 33 +++++++++++++++++++++++++++++++++
 tests/qemu-iotests/087.out | 13 +++++++++++++
 3 files changed, 52 insertions(+)

diff --git a/block.c b/block.c
index eb0810e..d7b6376 100644
--- a/block.c
+++ b/block.c
@@ -304,6 +304,12 @@ BlockDriverState *bdrv_new(const char *device_name, Error **errp)
 {
     BlockDriverState *bs;
 
+    if (bdrv_find(device_name)) {
+        error_setg(errp, "Device with id '%s' already exists",
+                   device_name);
+        return NULL;
+    }
+
     bs = g_malloc0(sizeof(BlockDriverState));
     pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
     if (device_name[0] != '\0') {
diff --git a/tests/qemu-iotests/087 b/tests/qemu-iotests/087
index 53b6c43..f2fb3f4 100755
--- a/tests/qemu-iotests/087
+++ b/tests/qemu-iotests/087
@@ -73,6 +73,39 @@ run_qemu <<EOF
 EOF
 
 echo
+echo === Duplicate ID ===
+echo
+
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add",
+  "arguments": {
+      "options": {
+        "driver": "$IMGFMT",
+        "id": "disk",
+        "file": {
+            "driver": "file",
+            "filename": "$TEST_IMG"
+        }
+      }
+    }
+  }
+{ "execute": "blockdev-add",
+  "arguments": {
+      "options": {
+        "driver": "$IMGFMT",
+        "id": "disk",
+        "file": {
+            "driver": "file",
+            "filename": "$TEST_IMG"
+        }
+      }
+    }
+  }
+{ "execute": "quit" }
+EOF
+
+echo
 echo === aio=native without O_DIRECT ===
 echo
 
diff --git a/tests/qemu-iotests/087.out b/tests/qemu-iotests/087.out
index b871032..19e0228 100644
--- a/tests/qemu-iotests/087.out
+++ b/tests/qemu-iotests/087.out
@@ -13,6 +13,19 @@ QMP_VERSION
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "floppy0", "tray-open": true}}
 
 
+=== Duplicate ID ===
+
+Testing:
+QMP_VERSION
+{"return": {}}
+{"return": {}}
+{"error": {"class": "GenericError", "desc": "Device with id 'disk' already exists"}}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "ide1-cd0", "tray-open": true}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "floppy0", "tray-open": true}}
+
+
 === aio=native without O_DIRECT ===
 
 Testing:
-- 
1.8.3.1