From nobody Mon Feb 9 19:07:30 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1681991001; cv=none; d=zohomail.com; s=zohoarc; b=l890El9CX4KFROVLbwyEqPMfi8LeZET16Pum71PmI+8wH3XEGVUAnxX5h3uSxFB71twIqPWBPapaeKLMuEGkcVqf3ifKJsULPZvd7Pf8+EPOzOejz2nW2DfNvBDGSLab2IAG1egHU+hJVwQPJz/1yfLsFN8EIbsToDwk2gH6SF4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1681991001; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=AI5kqkdzipCjtseeQPE5/aVyAJxrbcrgigA/+qZzi/8=; b=RfUq/H8+0vhWw8PPfHBW/2yGxfCadl4WpsbqnlrlCRxbpP0RoLZ6JeJN6IaFoKlbJJKXb2nIZ8GDfP54tO9IAVmma6d/XFy1S3v/L4bv/SoduHppqVRqoj0fg9aI/INkoV7PINCclYT1zXNF9iCUj8UmW7w1vNkg4zwofo32EVk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1681991001740988.9252806905844; Thu, 20 Apr 2023 04:43:21 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ppSfi-0002Ge-8c; Thu, 20 Apr 2023 07:41:54 -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 1ppSdK-0007yT-Is for qemu-devel@nongnu.org; Thu, 20 Apr 2023 07:39:29 -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 1ppSd7-0001gN-OD for qemu-devel@nongnu.org; Thu, 20 Apr 2023 07:39:22 -0400 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-186-PHYKj5zEMma4KAeFkTC-BQ-1; Thu, 20 Apr 2023 07:38:54 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8CD341C0897A; Thu, 20 Apr 2023 11:38:53 +0000 (UTC) Received: from localhost (unknown [10.39.193.254]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9B3182166B33; Thu, 20 Apr 2023 11:38:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681990737; 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=AI5kqkdzipCjtseeQPE5/aVyAJxrbcrgigA/+qZzi/8=; b=Hqn0ztEKQqjEgEFw9nxur1u0fYAsnyIWsm9p3PDF75zbVQzd6GWAVHqjRMDkGe4hfpxuPW cNy3f5XVEWed0XRIEFOakdA17DsjGuMQ+MXUPSwj0y3JZt7f6lLmSmt8xea1MRewNlz5mq +oR52PwaTg+xO0vhclhQe3RXhVw8v3s= X-MC-Unique: PHYKj5zEMma4KAeFkTC-BQ-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Peter Lieven , Stefan Hajnoczi , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Xie Yongji , Juan Quintela , qemu-block@nongnu.org, Eduardo Habkost , Richard Henderson , David Woodhouse , Stefan Weil , Fam Zheng , Julia Suvorova , Ronnie Sahlberg , xen-devel@lists.xenproject.org, Hanna Reitz , "Dr. David Alan Gilbert" , eesposit@redhat.com, Kevin Wolf , Marcel Apfelbaum , Stefano Stabellini , Paul Durrant , Aarushi Mehta , "Michael S. Tsirkin" , Anthony Perard , "Richard W.M. Jones" , Coiby Xu , Stefano Garzarella Subject: [PATCH v3 15/20] block/fuse: do not set is_external=true on FUSE fd Date: Thu, 20 Apr 2023 07:37:27 -0400 Message-Id: <20230420113732.336620-16-stefanha@redhat.com> In-Reply-To: <20230420113732.336620-1-stefanha@redhat.com> References: <20230420113732.336620-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@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, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1681991003601100007 Content-Type: text/plain; charset="utf-8" This is part of ongoing work to remove the aio_disable_external() API. Use BlockDevOps .drained_begin/end/poll() instead of aio_set_fd_handler(is_external=3Dtrue). As a side-effect the FUSE export now follows AioContext changes like the other export types. Signed-off-by: Stefan Hajnoczi --- block/export/fuse.c | 58 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 56 insertions(+), 2 deletions(-) diff --git a/block/export/fuse.c b/block/export/fuse.c index 06fa41079e..65a7f4d723 100644 --- a/block/export/fuse.c +++ b/block/export/fuse.c @@ -50,6 +50,7 @@ typedef struct FuseExport { =20 struct fuse_session *fuse_session; struct fuse_buf fuse_buf; + unsigned int in_flight; /* atomic */ bool mounted, fd_handler_set_up; =20 char *mountpoint; @@ -78,6 +79,42 @@ static void read_from_fuse_export(void *opaque); static bool is_regular_file(const char *path, Error **errp); =20 =20 +static void fuse_export_drained_begin(void *opaque) +{ + FuseExport *exp =3D opaque; + + aio_set_fd_handler(exp->common.ctx, + fuse_session_fd(exp->fuse_session), false, + NULL, NULL, NULL, NULL, NULL); + exp->fd_handler_set_up =3D false; +} + +static void fuse_export_drained_end(void *opaque) +{ + FuseExport *exp =3D opaque; + + /* Refresh AioContext in case it changed */ + exp->common.ctx =3D blk_get_aio_context(exp->common.blk); + + aio_set_fd_handler(exp->common.ctx, + fuse_session_fd(exp->fuse_session), false, + read_from_fuse_export, NULL, NULL, NULL, exp); + exp->fd_handler_set_up =3D true; +} + +static bool fuse_export_drained_poll(void *opaque) +{ + FuseExport *exp =3D opaque; + + return qatomic_read(&exp->in_flight) > 0; +} + +static const BlockDevOps fuse_export_blk_dev_ops =3D { + .drained_begin =3D fuse_export_drained_begin, + .drained_end =3D fuse_export_drained_end, + .drained_poll =3D fuse_export_drained_poll, +}; + static int fuse_export_create(BlockExport *blk_exp, BlockExportOptions *blk_exp_args, Error **errp) @@ -101,6 +138,15 @@ static int fuse_export_create(BlockExport *blk_exp, } } =20 + blk_set_dev_ops(exp->common.blk, &fuse_export_blk_dev_ops, exp); + + /* + * We handle draining ourselves using an in-flight counter and by disa= bling + * the FUSE fd handler. Do not queue BlockBackend requests, they need = to + * complete so the in-flight counter reaches zero. + */ + blk_set_disable_request_queuing(exp->common.blk, true); + init_exports_table(); =20 /* @@ -224,7 +270,7 @@ static int setup_fuse_export(FuseExport *exp, const cha= r *mountpoint, g_hash_table_insert(exports, g_strdup(mountpoint), NULL); =20 aio_set_fd_handler(exp->common.ctx, - fuse_session_fd(exp->fuse_session), true, + fuse_session_fd(exp->fuse_session), false, read_from_fuse_export, NULL, NULL, NULL, exp); exp->fd_handler_set_up =3D true; =20 @@ -246,6 +292,8 @@ static void read_from_fuse_export(void *opaque) =20 blk_exp_ref(&exp->common); =20 + qatomic_inc(&exp->in_flight); + do { ret =3D fuse_session_receive_buf(exp->fuse_session, &exp->fuse_buf= ); } while (ret =3D=3D -EINTR); @@ -256,6 +304,10 @@ static void read_from_fuse_export(void *opaque) fuse_session_process_buf(exp->fuse_session, &exp->fuse_buf); =20 out: + if (qatomic_fetch_dec(&exp->in_flight) =3D=3D 1) { + aio_wait_kick(); /* wake AIO_WAIT_WHILE() */ + } + blk_exp_unref(&exp->common); } =20 @@ -268,7 +320,7 @@ static void fuse_export_shutdown(BlockExport *blk_exp) =20 if (exp->fd_handler_set_up) { aio_set_fd_handler(exp->common.ctx, - fuse_session_fd(exp->fuse_session), true, + fuse_session_fd(exp->fuse_session), false, NULL, NULL, NULL, NULL, NULL); exp->fd_handler_set_up =3D false; } @@ -287,6 +339,8 @@ static void fuse_export_delete(BlockExport *blk_exp) { FuseExport *exp =3D container_of(blk_exp, FuseExport, common); =20 + blk_set_dev_ops(exp->common.blk, NULL, NULL); + if (exp->fuse_session) { if (exp->mounted) { fuse_session_unmount(exp->fuse_session); --=20 2.39.2