From patchwork Mon May 23 02:19:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 9131113 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 78BE460760 for ; Mon, 23 May 2016 02:43:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6B1C2281A2 for ; Mon, 23 May 2016 02:43:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5FCB0281EB; Mon, 23 May 2016 02:43:56 +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 D486E281A2 for ; Mon, 23 May 2016 02:43:55 +0000 (UTC) Received: from localhost ([::1]:45353 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fqU-0007Ct-OM for patchwork-qemu-devel@patchwork.kernel.org; Sun, 22 May 2016 22:43:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51133) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fT2-00047l-Cb for qemu-devel@nongnu.org; Sun, 22 May 2016 22:19:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b4fSy-0003tJ-3b for qemu-devel@nongnu.org; Sun, 22 May 2016 22:19:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35938) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fSq-0003rN-8t; Sun, 22 May 2016 22:19:28 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (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 E5EC378225; Mon, 23 May 2016 02:19:27 +0000 (UTC) Received: from lemon.redhat.com (vpn1-7-186.pek2.redhat.com [10.72.7.186]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4N2JDgM010152; Sun, 22 May 2016 22:19:25 -0400 From: Fam Zheng To: qemu-devel@nongnu.org Date: Mon, 23 May 2016 10:19:37 +0800 Message-Id: <1463969978-24970-4-git-send-email-famz@redhat.com> In-Reply-To: <1463969978-24970-1-git-send-email-famz@redhat.com> References: <1463969978-24970-1-git-send-email-famz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Mon, 23 May 2016 02:19:27 +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 v2 3/4] virtio-blk: Remove op blocker for dataplane 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: Kevin Wolf , qemu-block@nongnu.org, "Michael S. Tsirkin" , Markus Armbruster , Max Reitz , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Block layer is prepared to unspecialize dataplane, an evidence is this almost complete list of unblocked operations. It has all types except two (actually three if DATAPLANE itself counts but blockdev.c makes sure attaching twice is not possible): MIRROR_TARGET and BACKUP_TARGET. blockdev-mirror refuses to start if target is attached, so the first is not a problem. By removing BACKUP_TARGET, blockdev-backup will become permissive to write to a virtio-blk dataplane disk, but that is not worse than non-dataplane given the latter is already possible. In either case, blockdev.c always checks the target and source are on the same AioContext, or bring them together if possible. Signed-off-by: Fam Zheng Acked-by: Michael S. Tsirkin --- hw/block/dataplane/virtio-blk.c | 63 ----------------------------------------- 1 file changed, 63 deletions(-) diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c index 3cb97c9..2073f9a 100644 --- a/hw/block/dataplane/virtio-blk.c +++ b/hw/block/dataplane/virtio-blk.c @@ -37,8 +37,6 @@ struct VirtIOBlockDataPlane { EventNotifier *guest_notifier; /* irq */ QEMUBH *bh; /* bh for guest notification */ - Notifier insert_notifier, remove_notifier; - /* Note that these EventNotifiers are assigned by value. This is * fine as long as you do not call event_notifier_cleanup on them * (because you don't own the file descriptor or handle; you just @@ -46,9 +44,6 @@ struct VirtIOBlockDataPlane { */ IOThread *iothread; AioContext *ctx; - - /* Operation blocker on BDS */ - Error *blocker; }; /* Raise an interrupt to signal guest, if necessary */ @@ -68,54 +63,6 @@ static void notify_guest_bh(void *opaque) event_notifier_set(s->guest_notifier); } -static void data_plane_set_up_op_blockers(VirtIOBlockDataPlane *s) -{ - assert(!s->blocker); - error_setg(&s->blocker, "block device is in use by data plane"); - blk_op_block_all(s->conf->conf.blk, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, - s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, - s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, - s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_MIRROR_SOURCE, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker); - blk_op_unblock(s->conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker); -} - -static void data_plane_remove_op_blockers(VirtIOBlockDataPlane *s) -{ - if (s->blocker) { - blk_op_unblock_all(s->conf->conf.blk, s->blocker); - error_free(s->blocker); - s->blocker = NULL; - } -} - -static void data_plane_blk_insert_notifier(Notifier *n, void *data) -{ - VirtIOBlockDataPlane *s = container_of(n, VirtIOBlockDataPlane, - insert_notifier); - assert(s->conf->conf.blk == data); - data_plane_set_up_op_blockers(s); -} - -static void data_plane_blk_remove_notifier(Notifier *n, void *data) -{ - VirtIOBlockDataPlane *s = container_of(n, VirtIOBlockDataPlane, - remove_notifier); - assert(s->conf->conf.blk == data); - data_plane_remove_op_blockers(s); -} - /* Context: QEMU global mutex held */ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, VirtIOBlockDataPlane **dataplane, @@ -158,13 +105,6 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, s->ctx = iothread_get_aio_context(s->iothread); s->bh = aio_bh_new(s->ctx, notify_guest_bh, s); - s->insert_notifier.notify = data_plane_blk_insert_notifier; - s->remove_notifier.notify = data_plane_blk_remove_notifier; - blk_add_insert_bs_notifier(conf->conf.blk, &s->insert_notifier); - blk_add_remove_bs_notifier(conf->conf.blk, &s->remove_notifier); - - data_plane_set_up_op_blockers(s); - *dataplane = s; } @@ -176,9 +116,6 @@ void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s) } virtio_blk_data_plane_stop(s); - data_plane_remove_op_blockers(s); - notifier_remove(&s->insert_notifier); - notifier_remove(&s->remove_notifier); qemu_bh_delete(s->bh); object_unref(OBJECT(s->iothread)); g_free(s);