From patchwork Wed Feb 22 18:55:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Sementsov-Ogievskiy X-Patchwork-Id: 13149507 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 C3FA5C636D6 for ; Wed, 22 Feb 2023 18:56:46 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pUuID-0006Zn-Vo; Wed, 22 Feb 2023 13:56:42 -0500 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 1pUuI9-0006Rd-Ur; Wed, 22 Feb 2023 13:56:37 -0500 Received: from forwardcorp1a.mail.yandex.net ([2a02:6b8:c0e:500:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pUuI7-0005AU-VT; Wed, 22 Feb 2023 13:56:37 -0500 Received: from mail-nwsmtp-smtp-corp-main-83.vla.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-83.vla.yp-c.yandex.net [IPv6:2a02:6b8:c15:2905:0:640:e5fe:0]) by forwardcorp1a.mail.yandex.net (Yandex) with ESMTP id DDB6D5FEC8; Wed, 22 Feb 2023 21:56:24 +0300 (MSK) Received: from vsementsov-win.yandex-team.ru (unknown [2a02:6b8:b081:a528::1:22]) by mail-nwsmtp-smtp-corp-main-83.vla.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id BuTfTE0KlSw0-w8rSwX7E; Wed, 22 Feb 2023 21:56:23 +0300 X-Yandex-Fwd: 1 Authentication-Results: mail-nwsmtp-smtp-corp-main-83.vla.yp-c.yandex.net; dkim=pass From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, armbru@redhat.com, eblake@redhat.com, hreitz@redhat.com, kwolf@redhat.com, den@openvz.org, vsementsov@yandex-team.ru, alexander.ivanov@virtuozzo.com Subject: [PATCH v6 4/7] qapi: add x-blockdev-replace command Date: Wed, 22 Feb 2023 21:55:49 +0300 Message-Id: <20230222185552.913733-5-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230222185552.913733-1-vsementsov@yandex-team.ru> References: <20230222185552.913733-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Received-SPF: pass client-ip=2a02:6b8:c0e:500:1:45:d181:df01; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1a.mail.yandex.net X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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 Add a command that can replace bs in following BdrvChild structures: - qdev blk root child - block-export blk root child - any child of BlockDriverState selected by child-name Signed-off-by: Vladimir Sementsov-Ogievskiy --- qapi/block-core.json | 62 ++++++++++++++++++++++++++++++++++++++++++ blockdev.c | 56 ++++++++++++++++++++++++++++++++++++++ stubs/blk-by-qdev-id.c | 9 ++++++ stubs/meson.build | 1 + 4 files changed, 128 insertions(+) create mode 100644 stubs/blk-by-qdev-id.c diff --git a/qapi/block-core.json b/qapi/block-core.json index 7f331eb8ea..1cbbcc00f2 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -5837,3 +5837,65 @@ ## { 'struct': 'DummyBlockCoreForceArrays', 'data': { 'unused-block-graph-info': ['BlockGraphInfo'] } } + +## +# @BlockParentType: +# +# Since 7.0 +## +{ 'enum': 'BlockParentType', + 'data': ['qdev', 'driver', 'export'] } + +## +# @BdrvChildRefQdev: +# +# Since 7.0 +## +{ 'struct': 'BdrvChildRefQdev', + 'data': { 'qdev-id': 'str' } } + +## +# @BdrvChildRefExport: +# +# Since 7.0 +## +{ 'struct': 'BdrvChildRefExport', + 'data': { 'export-id': 'str' } } + +## +# @BdrvChildRefDriver: +# +# Since 7.0 +## +{ 'struct': 'BdrvChildRefDriver', + 'data': { 'node-name': 'str', 'child': 'str' } } + +## +# @BlockdevReplace: +# +# Since 7.0 +## +{ 'union': 'BlockdevReplace', + 'base': { + 'parent-type': 'BlockParentType', + 'new-child': 'str' + }, + 'discriminator': 'parent-type', + 'data': { + 'qdev': 'BdrvChildRefQdev', + 'export': 'BdrvChildRefExport', + 'driver': 'BdrvChildRefDriver' + } } + +## +# @x-blockdev-replace: +# +# Replace a block-node associated with device (selected by +# @qdev-id) or with block-export (selected by @export-id) or +# any child of block-node (selected by @node-name and @child) +# with @new-child block-node. +# +# Since 7.0 +## +{ 'command': 'x-blockdev-replace', 'boxed': true, + 'data': 'BlockdevReplace' } diff --git a/blockdev.c b/blockdev.c index 461657edda..75d6283ef3 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2193,6 +2193,62 @@ static void abort_commit(BlkActionState *common) g_assert_not_reached(); /* this action never succeeds */ } +void qmp_x_blockdev_replace(BlockdevReplace *repl, Error **errp) +{ + BdrvChild *child = NULL; + BlockDriverState *new_child_bs; + + if (repl->parent_type == BLOCK_PARENT_TYPE_DRIVER) { + BlockDriverState *parent_bs; + + parent_bs = bdrv_find_node(repl->u.driver.node_name); + if (!parent_bs) { + error_setg(errp, "Block driver node with node-name '%s' not " + "found", repl->u.driver.node_name); + return; + } + + child = bdrv_find_child(parent_bs, repl->u.driver.child); + if (!child) { + error_setg(errp, "Block driver node '%s' doesn't have child " + "named '%s'", repl->u.driver.node_name, + repl->u.driver.child); + return; + } + } else { + /* Other types are similar, they work through blk */ + BlockBackend *blk; + bool is_qdev = repl->parent_type == BLOCK_PARENT_TYPE_QDEV; + const char *id = + is_qdev ? repl->u.qdev.qdev_id : repl->u.export.export_id; + + assert(is_qdev || repl->parent_type == BLOCK_PARENT_TYPE_EXPORT); + + blk = is_qdev ? blk_by_qdev_id(id, errp) : blk_by_export_id(id, errp); + if (!blk) { + return; + } + + child = blk_root(blk); + if (!child) { + error_setg(errp, "%s '%s' is empty, nothing to replace", + is_qdev ? "Device" : "Export", id); + return; + } + } + + assert(child); + assert(child->bs); + + new_child_bs = bdrv_find_node(repl->new_child); + if (!new_child_bs) { + error_setg(errp, "Node '%s' not found", repl->new_child); + return; + } + + bdrv_replace_child_bs(child, new_child_bs, errp); +} + static const BlkActionOps actions[] = { [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = { .instance_size = sizeof(ExternalSnapshotState), diff --git a/stubs/blk-by-qdev-id.c b/stubs/blk-by-qdev-id.c new file mode 100644 index 0000000000..0e751ce4f7 --- /dev/null +++ b/stubs/blk-by-qdev-id.c @@ -0,0 +1,9 @@ +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "sysemu/block-backend.h" + +BlockBackend *blk_by_qdev_id(const char *id, Error **errp) +{ + error_setg(errp, "blk '%s' not found", id); + return NULL; +} diff --git a/stubs/meson.build b/stubs/meson.build index 981585cbdf..761108853e 100644 --- a/stubs/meson.build +++ b/stubs/meson.build @@ -1,6 +1,7 @@ stub_ss.add(files('bdrv-next-monitor-owned.c')) stub_ss.add(files('blk-commit-all.c')) stub_ss.add(files('blk-exp-close-all.c')) +stub_ss.add(files('blk-by-qdev-id.c')) stub_ss.add(files('blockdev-close-all-bdrv-states.c')) stub_ss.add(files('change-state-handler.c')) stub_ss.add(files('cmos.c'))