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Thu, 23 May 2019 15:44:58 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x4NFiv3I002449; Thu, 23 May 2019 15:44:57 GMT Received: from nexus.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 23 May 2019 15:44:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=oYQNiLLInCaatn1i0R555HgKyXewzttIoWAlCHlEROk=; b=gXUztAlZ6KmzK64r8eD8++oi8kcJLgouKwK9Rw9OzBMWLUMuXB4k1FO9by0Cpc+wIuke j5ZYBLoodloizxJBsnejD6Hsb2uwhFAVnKbdoR8I85lvo7Csd54jAHmgtchTkuzJT/RH 5W7P5VQh8pRMPMpx3kItcC+P0byKdSn/RnYHBF9hK6J2k4UrK6zo74IwCPKLhD1qrGId YJ4n6kkUtA70kyHd6N23ab8ytxYo1ohdR5OLw6UsZdwm0jtRMw+M5o5m5dvuM/DA3LGR iwH+czaIFOIhdJ+A4SEZ52Hhwruc1EK+MzNubwDgUksBwHJ0EX//5DsxeQ07Pp/vuZye Tw== From: Sam Eiderman To: kwolf@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org, mreitz@redhat.com Date: Thu, 23 May 2019 18:44:42 +0300 Message-Id: <20190523154444.28783-2-shmuel.eiderman@oracle.com> X-Mailer: git-send-email 2.13.3 In-Reply-To: <20190523154444.28783-1-shmuel.eiderman@oracle.com> References: <20190523154444.28783-1-shmuel.eiderman@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9265 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=926 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905230107 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9265 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=955 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905230107 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 141.146.126.79 Subject: [Qemu-devel] [PATCH v4 1/3] qemu-img: rebase: Reuse parent BlockDriverState X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: eyal.moscovici@oracle.com, arbel.moshe@oracle.com, liran.alon@oracle.com, shmuel.eiderman@oracle.com, sagi.amit@oracle.com, karl.heubaum@oracle.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" In safe mode we open the entire chain, including the parent backing file of the rebased file. Do not open a new BlockBackend for the parent backing file, which saves opening the rest of the chain twice, which for long chains saves many "pricy" bdrv_open() calls. Permissions for blk_new() were copied from blk_new_open() when flags =3D 0. Reviewed-by: Karl Heubaum Reviewed-by: Eyal Moscovici Signed-off-by: Sagi Amit Co-developed-by: Sagi Amit Signed-off-by: Sam Eiderman Reviewed-by: Max Reitz --- qemu-img.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-) diff --git a/qemu-img.c b/qemu-img.c index 28fba1e7a7..9bd0bb1e47 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -3309,29 +3309,18 @@ static int img_rebase(int argc, char **argv) =20 /* For safe rebasing we need to compare old and new backing file */ if (!unsafe) { - char backing_name[PATH_MAX]; QDict *options =3D NULL; + BlockDriverState *base_bs =3D backing_bs(bs); =20 - if (bs->backing) { - if (bs->backing_format[0] !=3D '\0') { - options =3D qdict_new(); - qdict_put_str(options, "driver", bs->backing_format); - } - - if (force_share) { - if (!options) { - options =3D qdict_new(); - } - qdict_put_bool(options, BDRV_OPT_FORCE_SHARE, true); - } - bdrv_get_backing_filename(bs, backing_name, sizeof(backing_nam= e)); - blk_old_backing =3D blk_new_open(backing_name, NULL, - options, src_flags, &local_err); - if (!blk_old_backing) { + if (base_bs) { + blk_old_backing =3D blk_new(BLK_PERM_CONSISTENT_READ, + BLK_PERM_ALL); + ret =3D blk_insert_bs(blk_old_backing, base_bs, + &local_err); + if (ret < 0) { error_reportf_err(local_err, - "Could not open old backing file '%s': ", - backing_name); - ret =3D -1; + "Could not reuse old backing file '%s': = ", + base_bs->filename); goto out; } } else { --=20 2.13.3