From patchwork Wed Nov 16 14:07:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 13045280 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 9A65FC433FE for ; Wed, 16 Nov 2022 14:09:49 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ovJ57-0001JT-5n; Wed, 16 Nov 2022 09:08:01 -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 1ovJ52-00011A-0B for qemu-devel@nongnu.org; Wed, 16 Nov 2022 09:07:57 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovJ4v-0006Bx-NZ for qemu-devel@nongnu.org; Wed, 16 Nov 2022 09:07:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668607667; 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=OJWhXn7L5fRW6faD6Zr3DmPk0qnapltpuK9piwE3ENI=; b=bAMOfEEs82mJUNnZ7utiiG98X/DTgi4tyz6cOPQDM0Rn7hF0tKznt1PtHd1EtOV/sucpkY lzqMVp96WVTLspZjaEh6qLHVbpwXTPagdIf9QPb9JmihsgM5e9GHVeMmB+VYAp896UjoZV 1ujq3zN3xie6mzXQNy/+6e3SEIrWXSs= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-365-K9iJxkp9NXavBvqxiFJSbg-1; Wed, 16 Nov 2022 09:07:43 -0500 X-MC-Unique: K9iJxkp9NXavBvqxiFJSbg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AADA78027F5; Wed, 16 Nov 2022 14:07:42 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 18803C2C8C5; Wed, 16 Nov 2022 14:07:42 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefan Hajnoczi , Ari Sundholm , Pavel Dovgalyuk , Paolo Bonzini , John Snow , Vladimir Sementsov-Ogievskiy , Stefan Weil , Fam Zheng , Ronnie Sahlberg , Peter Lieven , Eric Blake , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Alberto Garcia , Ilya Dryomov , Wen Congyang , Xie Changlong , "Richard W.M. Jones" , Jeff Cody , Cleber Rosa , qemu-devel@nongnu.org, integration@gluster.org, Emanuele Giuseppe Esposito Subject: [PATCH 13/15] block: convert bdrv_io_plug in generated_co_wrapper_simple Date: Wed, 16 Nov 2022 09:07:28 -0500 Message-Id: <20221116140730.3056048-14-eesposit@redhat.com> In-Reply-To: <20221116140730.3056048-1-eesposit@redhat.com> References: <20221116140730.3056048-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H2=-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 BlockDriver->bdrv_io_plug is categorized as IO callback, and it currently doesn't run in a coroutine. This makes very difficult to add the graph rdlock, since the callback traverses the block nodes graph. The only caller of this function is blk_plug, therefore make blk_plug a generated_co_wrapper_simple, so that it always creates a new coroutine, and then make bdrv_plug coroutine_fn. Signed-off-by: Emanuele Giuseppe Esposito --- block/block-backend.c | 5 +++-- block/io.c | 5 +++-- include/block/block-io.h | 3 ++- include/block/block_int-common.h | 4 ++-- include/sysemu/block-backend-io.h | 4 +++- 5 files changed, 13 insertions(+), 8 deletions(-) diff --git a/block/block-backend.c b/block/block-backend.c index 75e2f2124f..826a936beb 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2329,13 +2329,14 @@ void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) notifier_list_add(&blk->insert_bs_notifiers, notify); } -void blk_io_plug(BlockBackend *blk) +void coroutine_fn blk_co_io_plug(BlockBackend *blk) { BlockDriverState *bs = blk_bs(blk); IO_CODE(); + assert_bdrv_graph_readable(); if (bs) { - bdrv_io_plug(bs); + bdrv_co_io_plug(bs); } } diff --git a/block/io.c b/block/io.c index 11d2c5dcde..d3b8c1e4b2 100644 --- a/block/io.c +++ b/block/io.c @@ -3068,13 +3068,14 @@ void *qemu_try_blockalign0(BlockDriverState *bs, size_t size) return mem; } -void bdrv_io_plug(BlockDriverState *bs) +void coroutine_fn bdrv_co_io_plug(BlockDriverState *bs) { BdrvChild *child; IO_CODE(); + assert_bdrv_graph_readable(); QLIST_FOREACH(child, &bs->children, next) { - bdrv_io_plug(child->bs); + bdrv_co_io_plug(child->bs); } if (qatomic_fetch_inc(&bs->io_plugged) == 0) { diff --git a/include/block/block-io.h b/include/block/block-io.h index 176e3cc734..a045643b26 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -215,7 +215,8 @@ void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c); -void bdrv_io_plug(BlockDriverState *bs); +void coroutine_fn bdrv_co_io_plug(BlockDriverState *bs); + void bdrv_io_unplug(BlockDriverState *bs); bool coroutine_fn bdrv_co_can_store_new_dirty_bitmap(BlockDriverState *bs, diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index b509855c19..ed96bc3241 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -785,8 +785,8 @@ struct BlockDriver { void coroutine_fn (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event); - /* io queue for linux-aio */ - void (*bdrv_io_plug)(BlockDriverState *bs); + /* io queue for linux-aio. Called with graph rdlock taken. */ + void coroutine_fn (*bdrv_io_plug)(BlockDriverState *bs); void (*bdrv_io_unplug)(BlockDriverState *bs); /** diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h index dd8566ee69..703fcc3ac5 100644 --- a/include/sysemu/block-backend-io.h +++ b/include/sysemu/block-backend-io.h @@ -87,7 +87,9 @@ void blk_iostatus_set_err(BlockBackend *blk, int error); int blk_get_max_iov(BlockBackend *blk); int blk_get_max_hw_iov(BlockBackend *blk); -void blk_io_plug(BlockBackend *blk); +void coroutine_fn blk_co_io_plug(BlockBackend *blk); +void generated_co_wrapper_simple blk_io_plug(BlockBackend *blk); + void blk_io_unplug(BlockBackend *blk); AioContext *blk_get_aio_context(BlockBackend *blk); BlockAcctStats *blk_get_stats(BlockBackend *blk);