From 4a378f730e73452bf9bf3a5c761f7d0efdae9d27 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Fri, 22 Mar 2019 03:22:39 +0100
Subject: [PATCH 072/163] nbd/client: Make x-dirty-bitmap more reliable

RH-Author: John Snow <jsnow@redhat.com>
Message-id: <20190322032241.8111-27-jsnow@redhat.com>
Patchwork-id: 85106
O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 26/28] nbd/client: Make x-dirty-bitmap more reliable
Bugzilla: 1691563
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: Eric Blake <eblake@redhat.com>

The implementation of x-dirty-bitmap in qemu 3.0 (commit 216ee365)
silently falls back to treating the server as not supporting
NBD_CMD_BLOCK_STATUS if a requested meta_context name was not
negotiated, which in turn means treating the _entire_ image as
data. Since our hack relied on using 'qemu-img map' to view
which portions of the image were dirty by seeing what the
redirected bdrv_block_status() treats as holes, this means
that our fallback treats the entire image as clean.  Better
would have been to treat the entire image as dirty, or to fail
to connect because the user's request for a specific context
could not be honored. This patch goes with the latter.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20181130023232.3079982-3-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
(cherry picked from commit 47829c40794160debdb33b4a042d182e776876d4)
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/nbd-client.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/nbd-client.c b/block/nbd-client.c
index 76e9ca3..e6e27da 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -992,6 +992,11 @@ int nbd_client_init(BlockDriverState *bs,
         logout("Failed to negotiate with the NBD server\n");
         return ret;
     }
+    if (x_dirty_bitmap && !client->info.base_allocation) {
+        error_setg(errp, "requested x-dirty-bitmap %s not found",
+                   x_dirty_bitmap);
+        return -EINVAL;
+    }
     if (client->info.flags & NBD_FLAG_READ_ONLY) {
         ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only", errp);
         if (ret < 0) {
-- 
1.8.3.1