From patchwork Mon Sep 7 18:20:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 11762029 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 48ED8112E for ; Mon, 7 Sep 2020 18:30:34 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id EC332206D4 for ; Mon, 7 Sep 2020 18:30:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KJASm3iu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC332206D4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:50348 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kFLuQ-0007dB-Lp for patchwork-qemu-devel@patchwork.kernel.org; Mon, 07 Sep 2020 14:30:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42726) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kFLlF-0005fA-W9 for qemu-devel@nongnu.org; Mon, 07 Sep 2020 14:21:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:42564) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kFLlA-0004eM-NW for qemu-devel@nongnu.org; Mon, 07 Sep 2020 14:21:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599502855; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TyTESgIRwVT/16t/ZAX+fErpReN/1+JHC0EHdQpAWSI=; b=KJASm3iun8BE+lQ7dwmQcxriNjQ5Tn7pbppM6oFFek6VCh6lDocRhLploW7vUaEizJKk4z K+S1IoMiDQUEW7MkrCxHVlXMYTRHJCCt6srA47v55C9LiNLVUdMFDBFVZf/TCJki6tRuw4 WvDVVt/xNehpBUaij9LNe3mMLpHpkwY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-579-RTlN9ZvkMC2-rq9P5Qmudw-1; Mon, 07 Sep 2020 14:20:54 -0400 X-MC-Unique: RTlN9ZvkMC2-rq9P5Qmudw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0F12818B9EC1; Mon, 7 Sep 2020 18:20:53 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-114-154.ams2.redhat.com [10.36.114.154]) by smtp.corp.redhat.com (Postfix) with ESMTP id E9A1860BF3; Mon, 7 Sep 2020 18:20:51 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH 20/29] block/export: Add block-export-del Date: Mon, 7 Sep 2020 20:20:02 +0200 Message-Id: <20200907182011.521007-21-kwolf@redhat.com> In-Reply-To: <20200907182011.521007-1-kwolf@redhat.com> References: <20200907182011.521007-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 14:12:50 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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=-0.1, 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, 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: 2.1.23 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" Implement a new QMP command block-export-del and make nbd-server-remove a wrapper around it. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- qapi/block-export.json | 32 ++++++++++++++++++++----- include/block/export.h | 1 + include/block/nbd.h | 1 - block/export/export.c | 43 +++++++++++++++++++++++++++++++++- block/monitor/block-hmp-cmds.c | 4 ++-- blockdev-nbd.c | 25 +++++--------------- nbd/server.c | 14 ----------- 7 files changed, 77 insertions(+), 43 deletions(-) diff --git a/qapi/block-export.json b/qapi/block-export.json index 9e05265b06..77a6b595e8 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -116,9 +116,9 @@ 'data': 'NbdServerAddOptions', 'boxed': true } ## -# @NbdServerRemoveMode: +# @BlockExportRemoveMode: # -# Mode for removing an NBD export. +# Mode for removing a block export. # # @safe: Remove export if there are no existing connections, fail otherwise. # @@ -134,16 +134,16 @@ # # Since: 2.12 ## -{'enum': 'NbdServerRemoveMode', 'data': ['safe', 'hard']} +{'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']} ## # @nbd-server-remove: # # Remove NBD export by name. # -# @name: Export name. +# @name: Block export id. # -# @mode: Mode of command operation. See @NbdServerRemoveMode description. +# @mode: Mode of command operation. See @BlockExportRemoveMode description. # Default is 'safe'. # # Returns: error if @@ -154,7 +154,7 @@ # Since: 2.12 ## { 'command': 'nbd-server-remove', - 'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} } + 'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'} } ## # @nbd-server-stop: @@ -213,3 +213,23 @@ ## { 'command': 'block-export-add', 'data': 'BlockExportOptions', 'boxed': true } + +## +# @block-export-del: +# +# Request to remove a block export. This drops the user's reference to the +# export, but the export may still stay around after this command returns until +# the shutdown of the export has completed. +# +# @id: Block export id. +# +# @mode: Mode of command operation. See @BlockExportRemoveMode description. +# Default is 'safe'. +# +# Returns: Error if the export is not found or @mode is 'safe' and the export +# is still in use (e.g. by existing client connections) +# +# Since: 5.2 +## +{ 'command': 'block-export-del', + 'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' } } diff --git a/include/block/export.h b/include/block/export.h index 4833947e89..ff54d35872 100644 --- a/include/block/export.h +++ b/include/block/export.h @@ -76,6 +76,7 @@ struct BlockExport { }; BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp); +BlockExport *blk_exp_find(const char *id); void blk_exp_ref(BlockExport *exp); void blk_exp_unref(BlockExport *exp); void blk_exp_request_shutdown(BlockExport *exp); diff --git a/include/block/nbd.h b/include/block/nbd.h index 0b9f3e5d4e..a4dc1f9e54 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -337,7 +337,6 @@ int nbd_export_new(BlockExport *blk_exp, BlockDriverState *bs, const char *bitmap, bool readonly, bool shared, bool writethrough, Error **errp); void nbd_export_set_on_eject_blk(BlockExport *exp, BlockBackend *blk); -void nbd_export_remove(NBDExport *exp, NbdServerRemoveMode mode, Error **errp); AioContext *nbd_export_aio_context(NBDExport *exp); NBDExport *nbd_export_find(const char *name); diff --git a/block/export/export.c b/block/export/export.c index 42aac867e9..4af3b69186 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -29,7 +29,7 @@ static const BlockExportDriver *blk_exp_drivers[] = { static QLIST_HEAD(, BlockExport) block_exports = QLIST_HEAD_INITIALIZER(block_exports); -static BlockExport *blk_exp_find(const char *id) +BlockExport *blk_exp_find(const char *id) { BlockExport *exp; @@ -136,12 +136,23 @@ void blk_exp_request_shutdown(BlockExport *exp) AioContext *aio_context = exp->ctx; aio_context_acquire(aio_context); + + /* + * If the user doesn't own the export any more, it is already shutting + * down. We must not call .request_shutdown and decrease the refcount a + * second time. + */ + if (!exp->user_owned) { + goto out; + } + exp->drv->request_shutdown(exp); assert(exp->user_owned); exp->user_owned = false; blk_exp_unref(exp); +out: aio_context_release(aio_context); } @@ -192,3 +203,33 @@ void qmp_block_export_add(BlockExportOptions *export, Error **errp) { blk_exp_add(export, errp); } + +void qmp_block_export_del(const char *id, + bool has_mode, BlockExportRemoveMode mode, + Error **errp) +{ + ERRP_GUARD(); + BlockExport *exp; + + exp = blk_exp_find(id); + if (exp == NULL) { + error_setg(errp, "Export '%s' is not found", id); + return; + } + if (!exp->user_owned) { + error_setg(errp, "Export '%s' is already shutting down", id); + return; + } + + if (!has_mode) { + mode = BLOCK_EXPORT_REMOVE_MODE_SAFE; + } + if (mode == BLOCK_EXPORT_REMOVE_MODE_SAFE && exp->refcount > 1) { + error_setg(errp, "export '%s' still in use", exp->id); + error_append_hint(errp, "Use mode='hard' to force client " + "disconnect\n"); + return; + } + + blk_exp_request_shutdown(exp); +} diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c index db357cafcb..d15a2be827 100644 --- a/block/monitor/block-hmp-cmds.c +++ b/block/monitor/block-hmp-cmds.c @@ -476,8 +476,8 @@ void hmp_nbd_server_remove(Monitor *mon, const QDict *qdict) bool force = qdict_get_try_bool(qdict, "force", false); Error *err = NULL; - /* Rely on NBD_SERVER_REMOVE_MODE_SAFE being the default */ - qmp_nbd_server_remove(name, force, NBD_SERVER_REMOVE_MODE_HARD, &err); + /* Rely on BLOCK_EXPORT_REMOVE_MODE_SAFE being the default */ + qmp_nbd_server_remove(name, force, BLOCK_EXPORT_REMOVE_MODE_HARD, &err); hmp_handle_error(mon, err); } diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 9efbaef8f7..4a9a1be571 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -307,31 +307,18 @@ fail: } void qmp_nbd_server_remove(const char *name, - bool has_mode, NbdServerRemoveMode mode, + bool has_mode, BlockExportRemoveMode mode, Error **errp) { - NBDExport *exp; - AioContext *aio_context; - - if (!nbd_server) { - error_setg(errp, "NBD server not running"); - return; - } + BlockExport *exp; - exp = nbd_export_find(name); - if (exp == NULL) { - error_setg(errp, "Export '%s' is not found", name); + exp = blk_exp_find(name); + if (exp && exp->drv->type != BLOCK_EXPORT_TYPE_NBD) { + error_setg(errp, "Block export '%s' is not an NBD export", name); return; } - if (!has_mode) { - mode = NBD_SERVER_REMOVE_MODE_SAFE; - } - - aio_context = nbd_export_aio_context(exp); - aio_context_acquire(aio_context); - nbd_export_remove(exp, mode, errp); - aio_context_release(aio_context); + qmp_block_export_del(name, has_mode, mode, errp); } void qmp_nbd_server_stop(Error **errp) diff --git a/nbd/server.c b/nbd/server.c index 22a1d66168..1a0e1db401 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1669,20 +1669,6 @@ static void nbd_export_request_shutdown(BlockExport *blk_exp) blk_exp_unref(&exp->common); } -void nbd_export_remove(NBDExport *exp, NbdServerRemoveMode mode, Error **errp) -{ - ERRP_GUARD(); - if (mode == NBD_SERVER_REMOVE_MODE_HARD || QTAILQ_EMPTY(&exp->clients)) { - nbd_export_request_shutdown(&exp->common); - return; - } - - assert(mode == NBD_SERVER_REMOVE_MODE_SAFE); - - error_setg(errp, "export '%s' still in use", exp->name); - error_append_hint(errp, "Use mode='hard' to force client disconnect\n"); -} - static void nbd_export_delete(BlockExport *blk_exp) { NBDExport *exp = container_of(blk_exp, NBDExport, common);