nbd/client: Send NBD_CMD_DISC if open fails after connect
If nbd_client_init() fails after we are already connected, then the server will spam logs with: Disconnect client, due to: Unexpected end-of-file before all bytes were read unless we gracefully disconnect before closing the connection. Ways to trigger this: $ opts=driver=nbd,export=foo,server.type=inet,server.host=localhost,server.port=10809 $ qemu-img map --output=json --image-opts $opts,read-only=off $ qemu-img map --output=json --image-opts $opts,x-dirty-bitmap=nosuch: Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20181130023232.3079982-4-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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@ -995,12 +995,13 @@ int nbd_client_init(BlockDriverState *bs,
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if (x_dirty_bitmap && !client->info.base_allocation) {
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error_setg(errp, "requested x-dirty-bitmap %s not found",
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x_dirty_bitmap);
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return -EINVAL;
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ret = -EINVAL;
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goto fail;
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}
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if (client->info.flags & NBD_FLAG_READ_ONLY) {
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ret = bdrv_apply_auto_read_only(bs, "NBD export is read-only", errp);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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}
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if (client->info.flags & NBD_FLAG_SEND_FUA) {
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@ -1029,4 +1030,17 @@ int nbd_client_init(BlockDriverState *bs,
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logout("Established connection with NBD server\n");
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return 0;
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fail:
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/*
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* We have connected, but must fail for other reasons. The
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* connection is still blocking; send NBD_CMD_DISC as a courtesy
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* to the server.
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*/
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{
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NBDRequest request = { .type = NBD_CMD_DISC };
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nbd_send_request(client->ioc ?: QIO_CHANNEL(sioc), &request);
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return ret;
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}
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}
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