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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B959C2D0E2 for ; Tue, 22 Sep 2020 10:53:44 +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 A875D2396D for ; Tue, 22 Sep 2020 10:53:43 +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="gMGn3XLI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A875D2396D 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50138 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kKfvY-0004iz-UE for qemu-devel@archiver.kernel.org; Tue, 22 Sep 2020 06:53:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60820) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kKfs2-0000BB-Mo for qemu-devel@nongnu.org; Tue, 22 Sep 2020 06:50:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:34302) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kKfrz-0000TE-Kl for qemu-devel@nongnu.org; Tue, 22 Sep 2020 06:50:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600771795; 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=BhZVKFSwmuAzcH2/U49rQXlAOhCA8MgG3ekspSBU1Lw=; b=gMGn3XLIpw2JzJ+mD2QTXNNQqk3iD5nMp1/7ngwIBTXspH1e6jHaNY271nf+eSSfpAqOWZ jPlx1dk5baQMaBejyFa+39KmDu9wFKBuRDrDWSuydwHHZ4n3beDd6vcIMGRmmZv/4VwSUY U51Z8fnEQQZOFkq1DhK0f/i+yKhX6EY= 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-180-obQtaXCZPXyv3nJPYBNaig-1; Tue, 22 Sep 2020 06:49:53 -0400 X-MC-Unique: obQtaXCZPXyv3nJPYBNaig-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 80AD580EF8B; Tue, 22 Sep 2020 10:49:52 +0000 (UTC) Received: from localhost (ovpn-114-26.ams2.redhat.com [10.36.114.26]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5D6825C1DC; Tue, 22 Sep 2020 10:49:49 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v2 04/20] fuse: Allow growable exports Date: Tue, 22 Sep 2020 12:49:16 +0200 Message-Id: <20200922104932.46384-5-mreitz@redhat.com> In-Reply-To: <20200922104932.46384-1-mreitz@redhat.com> References: <20200922104932.46384-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 02:07:04 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, 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: Kevin Wolf , qemu-devel@nongnu.org, Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" These will behave more like normal files in that writes beyond the EOF will automatically grow the export size. Signed-off-by: Max Reitz --- qapi/block-export.json | 6 +++++- block/export/fuse.c | 12 +++++++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/qapi/block-export.json b/qapi/block-export.json index cb5bd54cbf..cb26daa98b 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -183,10 +183,14 @@ # @mountpoint: Path on which to export the block device via FUSE. # This must point to an existing regular file. # +# @growable: Whether writes beyond the EOF should grow the block node +# accordingly. (default: false) +# # Since: 5.2 ## { 'struct': 'BlockExportOptionsFuse', - 'data': { 'mountpoint': 'str' }, + 'data': { 'mountpoint': 'str', + '*growable': 'bool' }, 'if': 'defined(CONFIG_FUSE)' } ## diff --git a/block/export/fuse.c b/block/export/fuse.c index 8fc667231d..f3a84579ba 100644 --- a/block/export/fuse.c +++ b/block/export/fuse.c @@ -45,6 +45,7 @@ typedef struct FuseExport { char *mountpoint; bool writable; + bool growable; } FuseExport; static GHashTable *exports; @@ -101,6 +102,7 @@ static int fuse_export_create(BlockExport *blk_exp, exp->mountpoint = g_strdup(args->mountpoint); exp->writable = blk_exp_args->writable; + exp->growable = args->growable; ret = setup_fuse_export(exp, args->mountpoint, errp); if (ret < 0) { @@ -436,7 +438,15 @@ static void fuse_write(fuse_req_t req, fuse_ino_t inode, const char *buf, size = MIN(size, BDRV_REQUEST_MAX_BYTES); if (offset + size > length) { - size = length - offset; + if (exp->growable) { + ret = fuse_do_truncate(exp, offset + size, PREALLOC_MODE_OFF); + if (ret < 0) { + fuse_reply_err(req, -ret); + return; + } + } else { + size = length - offset; + } } ret = blk_pwrite(exp->common.blk, offset, buf, size, 0); -- 2.26.2