From patchwork Wed Jul 6 14:45:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 9216453 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7A660607D9 for ; Wed, 6 Jul 2016 14:46:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6C13E22B27 for ; Wed, 6 Jul 2016 14:46:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6005A23B24; Wed, 6 Jul 2016 14:46:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EC5C422B27 for ; Wed, 6 Jul 2016 14:46:58 +0000 (UTC) Received: from localhost ([::1]:33941 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKo6M-0004le-4w for patchwork-qemu-devel@patchwork.kernel.org; Wed, 06 Jul 2016 10:46:58 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46732) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKo4s-0002bo-5j for qemu-devel@nongnu.org; Wed, 06 Jul 2016 10:45:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bKo4q-000804-P3 for qemu-devel@nongnu.org; Wed, 06 Jul 2016 10:45:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39853) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKo4i-0007ww-QJ; Wed, 06 Jul 2016 10:45:16 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5D216A0B5F; Wed, 6 Jul 2016 14:45:16 +0000 (UTC) Received: from noname.str.redhat.com. (dhcp-192-197.str.redhat.com [10.33.192.197]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u66EjDor012299; Wed, 6 Jul 2016 10:45:15 -0400 From: Kevin Wolf To: qemu-block@nongnu.org Date: Wed, 6 Jul 2016 16:45:04 +0200 Message-Id: <1467816309-16657-2-git-send-email-kwolf@redhat.com> In-Reply-To: <1467816309-16657-1-git-send-email-kwolf@redhat.com> References: <1467816309-16657-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 06 Jul 2016 14:45:16 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 1/6] block/qdev: Allow node name for drive properties X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP If a node name instead of a BlockBackend name is specified as the driver for a guest device, an anonymous BlockBackend is created now. usb-storage uses a hack where it forwards its BlockBackend as a property to another device that it internally creates. This hack must be updated so that it doesn't drop its original BB before it can be passed to the other device. This used to work because we always had the monitor reference around, but with node-names the device reference is the only one now. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- hw/core/qdev-properties-system.c | 37 ++++++++++++++++++++++++++++++++----- hw/usb/dev-storage.c | 5 ++++- 2 files changed, 36 insertions(+), 6 deletions(-) diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index df38b8a..615c191 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -72,12 +72,21 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr, const char *propname, Error **errp) { BlockBackend *blk; + bool blk_created = false; blk = blk_by_name(str); if (!blk) { + BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL); + if (bs) { + blk = blk_new(); + blk_insert_bs(blk, bs); + blk_created = true; + } + } + if (!blk) { error_setg(errp, "Property '%s.%s' can't find value '%s'", object_get_typename(OBJECT(dev)), propname, str); - return; + goto fail; } if (blk_attach_dev(blk, dev) < 0) { DriveInfo *dinfo = blk_legacy_dinfo(blk); @@ -91,9 +100,16 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr, error_setg(errp, "Drive '%s' is already in use by another device", str); } - return; + goto fail; } + *ptr = blk; + +fail: + if (blk_created) { + /* If we need to keep a reference, blk_attach_dev() took it */ + blk_unref(blk); + } } static void release_drive(Object *obj, const char *name, void *opaque) @@ -127,7 +143,7 @@ static void set_drive(Object *obj, Visitor *v, const char *name, void *opaque, PropertyInfo qdev_prop_drive = { .name = "str", - .description = "ID of a drive to use as a backend", + .description = "Node name or ID of a block device to use as a backend", .get = get_drive, .set = set_drive, .release = release_drive, @@ -362,8 +378,19 @@ PropertyInfo qdev_prop_vlan = { void qdev_prop_set_drive(DeviceState *dev, const char *name, BlockBackend *value, Error **errp) { - object_property_set_str(OBJECT(dev), value ? blk_name(value) : "", - name, errp); + const char *ref = NULL; + + if (value) { + ref = blk_name(value); + if (!*ref) { + BlockDriverState *bs = blk_bs(value); + if (bs) { + ref = bdrv_get_node_name(bs); + } + } + } + + object_property_set_str(OBJECT(dev), ref, name, errp); } void qdev_prop_set_chr(DeviceState *dev, const char *name, diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c index 4d605b8..78038a2 100644 --- a/hw/usb/dev-storage.c +++ b/hw/usb/dev-storage.c @@ -609,10 +609,12 @@ static void usb_msd_realize_storage(USBDevice *dev, Error **errp) * a SCSI bus that can serve only a single device, which it * creates automatically. But first it needs to detach from its * blockdev, or else scsi_bus_legacy_add_drive() dies when it - * attaches again. + * attaches again. We also need to take another reference so that + * blk_detach_dev() doesn't free blk while we still need it. * * The hack is probably a bad idea. */ + blk_ref(blk); blk_detach_dev(blk, &s->dev.qdev); s->conf.blk = NULL; @@ -623,6 +625,7 @@ static void usb_msd_realize_storage(USBDevice *dev, Error **errp) scsi_dev = scsi_bus_legacy_add_drive(&s->bus, blk, 0, !!s->removable, s->conf.bootindex, dev->serial, &err); + blk_unref(blk); if (!scsi_dev) { error_propagate(errp, err); return;