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Tue, 01 Oct 2019 23:47:45 +0000 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x91NljYs47513972 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 1 Oct 2019 23:47:45 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E97902805A; Tue, 1 Oct 2019 23:47:44 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CDE4228059; Tue, 1 Oct 2019 23:47:44 +0000 (GMT) Received: from localhost (unknown [9.53.179.213]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 1 Oct 2019 23:47:44 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Subject: [PATCH 05/97] qcow2: Fix qcow2_make_empty() with external data file Date: Tue, 1 Oct 2019 18:44:44 -0500 Message-Id: <20191001234616.7825-6-mdroth@linux.vnet.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191001234616.7825-1-mdroth@linux.vnet.ibm.com> References: <20191001234616.7825-1-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-01_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910010203 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 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-stable@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Kevin Wolf make_completely_empty() is an optimisated path for bdrv_make_empty() where completely new metadata is created inside the image file instead of going through all clusters and discarding them. For an external data file, however, we actually need to do discard operations on the data file; just overwriting the qcow2 file doesn't get rid of the data. The necessary slow path with an explicit discard operation already exists for other cases. Use it for external data files, too. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake (cherry picked from commit db04524f820582ebf1189223b6378de238511da1) Signed-off-by: Michael Roth --- block/qcow2.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 7fbef97aab..840f289a48 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -4384,14 +4384,17 @@ static int qcow2_make_empty(BlockDriverState *bs) if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps && 3 + l1_clusters <= s->refcount_block_size && - s->crypt_method_header != QCOW_CRYPT_LUKS) { + s->crypt_method_header != QCOW_CRYPT_LUKS && + !has_data_file(bs)) { /* The following function only works for qcow2 v3 images (it * requires the dirty flag) and only as long as there are no * features that reserve extra clusters (such as snapshots, * LUKS header, or persistent bitmaps), because it completely * empties the image. Furthermore, the L1 table and three * additional clusters (image header, refcount table, one - * refcount block) have to fit inside one refcount block. */ + * refcount block) have to fit inside one refcount block. It + * only resets the image file, i.e. does not work with an + * external data file. */ return make_completely_empty(bs); } -- 2.17.1