From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B39CEC5B543 for ; Wed, 4 Jun 2025 18:00:39 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uMsMV-0002ZG-LV; Wed, 04 Jun 2025 13:57:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uMsME-0002LT-MP for qemu-devel@nongnu.org; Wed, 04 Jun 2025 13:56:59 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uMsMA-0000Wb-VD for qemu-devel@nongnu.org; Wed, 04 Jun 2025 13:56:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1749059814; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qa2nagy+k4YUIF8BffyxJims+i6IqA1schOl/axi3A8=; b=Le+2CizTuZWrbBoKDIxAZRoRnAdHBN4l1v85t17qyD0CSFLQVCbLdX40cnoNr469LztUs4 T+tmyOhp44nWlJM4L9nxVk/b92JalS2ML4Oc5XamWYvJPnt8+Ll+UtRiryn/ZhY7iaiHb8 623BoEYJ+SVfNAMJhH0cKGHo1FH7OLw= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-124-dGwNOz07NHOdx5a8PzaVow-1; Wed, 04 Jun 2025 13:56:51 -0400 X-MC-Unique: dGwNOz07NHOdx5a8PzaVow-1 X-Mimecast-MFC-AGG-ID: dGwNOz07NHOdx5a8PzaVow_1749059810 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 339C018001D6; Wed, 4 Jun 2025 17:56:50 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.44.34.43]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E659518003FD; Wed, 4 Jun 2025 17:56:48 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 17/24] blockdev: drain while unlocked in internal_snapshot_action() Date: Wed, 4 Jun 2025 19:56:06 +0200 Message-ID: <20250604175613.344113-18-kwolf@redhat.com> In-Reply-To: <20250604175613.344113-1-kwolf@redhat.com> References: <20250604175613.344113-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.128, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Fiona Ebner This is in preparation to mark bdrv_drained_begin() as GRAPH_UNLOCKED. Signed-off-by: Fiona Ebner Message-ID: <20250530151125.955508-18-f.ebner@proxmox.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- blockdev.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/blockdev.c b/blockdev.c index bd5ca77619..506755bef1 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1208,7 +1208,7 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal, Error *local_err = NULL; const char *device; const char *name; - BlockDriverState *bs; + BlockDriverState *bs, *check_bs; QEMUSnapshotInfo old_sn, *sn; bool ret; int64_t rt; @@ -1216,7 +1216,7 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal, int ret1; GLOBAL_STATE_CODE(); - GRAPH_RDLOCK_GUARD_MAINLOOP(); + bdrv_graph_rdlock_main_loop(); tran_add(tran, &internal_snapshot_drv, state); @@ -1225,14 +1225,29 @@ static void internal_snapshot_action(BlockdevSnapshotInternal *internal, bs = qmp_get_root_bs(device, errp); if (!bs) { + bdrv_graph_rdunlock_main_loop(); return; } state->bs = bs; + /* Need to drain while unlocked. */ + bdrv_graph_rdunlock_main_loop(); /* Paired with .clean() */ bdrv_drained_begin(bs); + GRAPH_RDLOCK_GUARD_MAINLOOP(); + + /* Make sure the root bs did not change with the drain. */ + check_bs = qmp_get_root_bs(device, errp); + if (bs != check_bs) { + if (check_bs) { + error_setg(errp, "Block node of device '%s' unexpectedly changed", + device); + } /* else errp is already set */ + return; + } + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { return; } -- 2.49.0