From nobody Wed Nov 12 07:09:44 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1568800467; cv=none; d=zoho.com; s=zohoarc; b=hJ7cROECiCzKj01S1btMMCF8A7YQIcFGu3yyiTh5CTdxdSB1f54sC1Bm/R97NQ1Nm4iFhLyZiZEEefIUZ3UWpiXZ0DorXebMstT5dLQmjIp0ZE5lOYWlmbhV+8LhrZ7aa/UuP+nHQvHxut0ah1d5AhynXswxSJA29GG7AD88ZhA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1568800467; 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:ARC-Authentication-Results; bh=r5nFXYybe7azodbFnjz2KGhyfBtUea2lZaD8mDEnsZ4=; b=TY8tO7S08VYPFnzXTUkHhgTuZzImWRh+VbylR4za6c4avhLwPDoINgwk/sU0wtPVD5X218bgl16d8lyJnY5P54BD5FgSQRXyas00MeOrB64lbSCfM1SJ8kZm5NCHhnrPTL160UCVrb27721+6Dd1cDflh2TNp8hz+S8Q66VZWcM= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1568800467963592.9040653721846; Wed, 18 Sep 2019 02:54:27 -0700 (PDT) Received: from localhost ([::1]:56746 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAWfI-00031V-9z for importer@patchew.org; Wed, 18 Sep 2019 05:54:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59326) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAWdG-0001H0-9r for qemu-devel@nongnu.org; Wed, 18 Sep 2019 05:52:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iAWdB-0005j2-V4 for qemu-devel@nongnu.org; Wed, 18 Sep 2019 05:52:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55718) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iAWd9-0005gN-GF; Wed, 18 Sep 2019 05:52:11 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CCD7B308A9E0; Wed, 18 Sep 2019 09:52:10 +0000 (UTC) Received: from localhost (ovpn-116-168.ams2.redhat.com [10.36.116.168]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DB5A119C70; Wed, 18 Sep 2019 09:52:07 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Wed, 18 Sep 2019 11:51:41 +0200 Message-Id: <20190918095144.955-6-mreitz@redhat.com> In-Reply-To: <20190918095144.955-1-mreitz@redhat.com> References: <20190918095144.955-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Wed, 18 Sep 2019 09:52:10 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 5/8] block: Evaluate @exact in protocol drivers 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 , Fam Zheng , qemu-devel@nongnu.org, Maxim Levitsky , Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" We have two protocol drivers that return success when trying to shrink a block device even though they cannot shrink it. This behavior is now only allowed with exact=3Dfalse, so they should return an error with exact=3Dtrue. Signed-off-by: Max Reitz Reviewed-by: Maxim Levitsky --- block/file-posix.c | 8 +++++++- block/iscsi.c | 7 ++++++- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index d8755c5fac..a85f3486d1 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2028,6 +2028,7 @@ static int coroutine_fn raw_co_truncate(BlockDriverSt= ate *bs, int64_t offset, } =20 if (S_ISREG(st.st_mode)) { + /* Always resizes to the exact @offset */ return raw_regular_truncate(bs, s->fd, offset, prealloc, errp); } =20 @@ -2038,7 +2039,12 @@ static int coroutine_fn raw_co_truncate(BlockDriverS= tate *bs, int64_t offset, } =20 if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { - if (offset > raw_getlength(bs)) { + int64_t cur_length =3D raw_getlength(bs); + + if (offset !=3D cur_length && exact) { + error_setg(errp, "Cannot resize device files"); + return -ENOTSUP; + } else if (offset > cur_length) { error_setg(errp, "Cannot grow device files"); return -EINVAL; } diff --git a/block/iscsi.c b/block/iscsi.c index a90426270a..cc2072ff6c 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -2126,6 +2126,7 @@ static int coroutine_fn iscsi_co_truncate(BlockDriver= State *bs, int64_t offset, Error **errp) { IscsiLun *iscsilun =3D bs->opaque; + int64_t cur_length; Error *local_err =3D NULL; =20 if (prealloc !=3D PREALLOC_MODE_OFF) { @@ -2145,7 +2146,11 @@ static int coroutine_fn iscsi_co_truncate(BlockDrive= rState *bs, int64_t offset, return -EIO; } =20 - if (offset > iscsi_getlength(bs)) { + cur_length =3D iscsi_getlength(bs); + if (offset !=3D cur_length && exact) { + error_setg(errp, "Cannot resize iSCSI devices"); + return -ENOTSUP; + } else if (offset > cur_length) { error_setg(errp, "Cannot grow iSCSI devices"); return -EINVAL; } --=20 2.21.0