From nobody Tue Feb 10 00:23:55 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=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1666953717; cv=none; d=zohomail.com; s=zohoarc; b=icne9iUO4r056H3rWX6Zplx1Zd7QsRmNx6h1PtnZ7bdoRBaPO1vOdgOTm+KmnQR9J61Afcu4V2qLQsIVG03vrK04HQFBUfgNTA7DaoYg989vEGp6p1TJ9ff2dJbZRhsP5feaRyaSeCgP0juMPbIpOs1QtfblRRdMUqtXxMl8a5s= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1666953717; 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=sigvptjhrAQET0tYrU2QZiRhDwRPChxgNGt6Rss/X6s=; b=T2ELyRt9aKZQwpN5FkUSlb6cpABcgTC9qu3hWLsoywtnkjrq7IS0hYCrY1lBtKNPJojX75WSb8/FlO7msBRtk30Xxs2ImW5HCjV5yyaBa7ieThaVehiVVnkbB8U3gRQu37In7aM3fpT8qI0m+ffWEBoDp4qqKlUDFxWdPuXwouE= 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=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1666953717246818.7919176783797; Fri, 28 Oct 2022 03:41:57 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ooMlt-0002Ej-2S; Fri, 28 Oct 2022 06:39:29 -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 1ooMln-0002Be-Uz for qemu-devel@nongnu.org; Fri, 28 Oct 2022 06:39:23 -0400 Received: from smtp-out1.suse.de ([2001:67c:2178:6::1c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ooMlm-00020i-AU for qemu-devel@nongnu.org; Fri, 28 Oct 2022 06:39:23 -0400 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 1BC7C219F4; Fri, 28 Oct 2022 10:39:19 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id ABB8813A6E; Fri, 28 Oct 2022 10:39:18 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id IOVfJ1axW2PVPwAAMHmgww (envelope-from ); Fri, 28 Oct 2022 10:39:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1666953559; h=from:from:reply-to: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=sigvptjhrAQET0tYrU2QZiRhDwRPChxgNGt6Rss/X6s=; b=WZvJLDUN/Y67ZWq5wv6/032NX3ItKgITTj7yuhrpsYqC0895xicitOdsPJv0kVkv5bwMDi tA2OSDcPCxcIGdFRYFvQN14H2oB2qfPO2inG6b2aANxWdQt6/B+pBppg5SN6QFxOLKvINh l3n6QqiWFI/79powClwCdDPlKGkS6l8= From: Nikolay Borisov To: dgilbert@redhat.com, berrange@redhat.com Cc: qemu-devel@nongnu.org, jfehlig@suse.com, Claudio.Fontana@suse.com, dfaggioli@suse.com, Nikolay Borisov Subject: [PATCH v3 05/14] io: implement io_pwritev for QIOChannelFile Date: Fri, 28 Oct 2022 13:39:05 +0300 Message-Id: <20221028103914.908728-6-nborisov@suse.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221028103914.908728-1-nborisov@suse.com> References: <20221028103914.908728-1-nborisov@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=2001:67c:2178:6::1c; envelope-from=nborisov@suse.com; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1666953718136100005 Content-Type: text/plain; charset="utf-8" The upcoming 'fixed-ram' feature would require qemu to write data at specific offsets of the file. Add a minimal implementation of pwritev and expose it via the io_pwritev interface. Signed-off-by: Nikolay Borisov Reviewed-by: Daniel P. Berrang=C3=A9 --- io/channel-file.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/io/channel-file.c b/io/channel-file.c index b67687c2aa64..a7a90c12dc2b 100644 --- a/io/channel-file.c +++ b/io/channel-file.c @@ -136,6 +136,30 @@ static ssize_t qio_channel_file_writev(QIOChannel *ioc, return ret; } =20 +static ssize_t qio_channel_file_pwritev(QIOChannel *ioc, + const struct iovec *iov, + size_t niov, + off_t offset, + Error **errp) +{ + QIOChannelFile *fioc =3D QIO_CHANNEL_FILE(ioc); + ssize_t ret; + + retry: + ret =3D pwritev(fioc->fd, iov, niov, offset); + if (ret <=3D 0) { + if (errno =3D=3D EAGAIN) { + return QIO_CHANNEL_ERR_BLOCK; + } + if (errno =3D=3D EINTR) { + goto retry; + } + error_setg_errno(errp, errno, "Unable to write to file"); + return -1; + } + return ret; +} + static int qio_channel_file_set_blocking(QIOChannel *ioc, bool enabled, Error **errp) @@ -218,6 +242,7 @@ static void qio_channel_file_class_init(ObjectClass *kl= ass, ioc_klass->io_writev =3D qio_channel_file_writev; ioc_klass->io_readv =3D qio_channel_file_readv; ioc_klass->io_set_blocking =3D qio_channel_file_set_blocking; + ioc_klass->io_pwritev =3D qio_channel_file_pwritev; ioc_klass->io_seek =3D qio_channel_file_seek; ioc_klass->io_close =3D qio_channel_file_close; ioc_klass->io_create_watch =3D qio_channel_file_create_watch; --=20 2.34.1