From nobody Tue Feb 10 10:54:48 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1591019369; cv=none; d=zohomail.com; s=zohoarc; b=ejs3AnodUJbs7gIN0pyyjHlwp5iwHp+c5uHKQNdyjRz7p8FIREdqW7DYa/aOY51UWgCQSXSf4BW+kXWAGS9ExePY4/NRD9VEeLPUkjWqWihKJb148sFPhVRtmHINxFMOr8pVWY+X0SNV8esX2G/OqIFUNTphvGDM28aAIEhyfhI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1591019369; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=pQzaPJP1EdnCS7ouZKIm5DfS+8zMGLkm8FHj5iSdsrM=; b=eqtUk7GqMPqr0aUDrxEn7kWHUE9SHRxV5Pq38+bGTlPN4S2woNUUQDHADhdqscIOZ/Gid0CjIIcxPO/0Xzw2cgrC2SLQZ7Lvj5UIyINV9S/AQr219FAIWCLrpBbOd+x7z2pRBt+EqkVGd4g5HLM56v0azlOpf9d6xd7M0cYsC+g= ARC-Authentication-Results: i=1; mx.zohomail.com; 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=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 159101936939220.603626715150313; Mon, 1 Jun 2020 06:49:29 -0700 (PDT) Received: from localhost ([::1]:49938 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jfkoi-000574-19 for importer@patchew.org; Mon, 01 Jun 2020 09:49:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33136) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jfkne-0003oO-14; Mon, 01 Jun 2020 09:48:22 -0400 Received: from relay.sw.ru ([185.231.240.75]:38774 helo=relay3.sw.ru) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jfknc-0001k3-4Y; Mon, 01 Jun 2020 09:48:21 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay3.sw.ru with esmtp (Exim 4.93) (envelope-from ) id 1jfknN-0005dY-O0; Mon, 01 Jun 2020 16:48:05 +0300 From: Andrey Shinkevich To: qemu-block@nongnu.org Subject: [PATCH v3 4/6] iotests: Dump bitmap directory info with qcow2.py Date: Mon, 1 Jun 2020 16:48:11 +0300 Message-Id: <1591019293-211155-5-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1591019293-211155-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1591019293-211155-1-git-send-email-andrey.shinkevich@virtuozzo.com> 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=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay3.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/01 09:48:16 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: kwolf@redhat.com, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Read and dump entries from the bitmap directory of QCOW2 image with the script qcow2.py. Header extension: Bitmaps ... Bitmap name bitmap-1 flag auto bitmap_table_offset 0xf0000 bitmap_table_size 8 flag_bits 2 type 1 granularity_bits 16 name_size 8 extra_data_size 0 Suggested-by: Kevin Wolf Signed-off-by: Andrey Shinkevich Reviewed-by: Eric Blake --- tests/qemu-iotests/qcow2.py | 104 ++++++++++++++++++++++++++++++++++++++++= +++- 1 file changed, 103 insertions(+), 1 deletion(-) diff --git a/tests/qemu-iotests/qcow2.py b/tests/qemu-iotests/qcow2.py index 8286115..e4453f6 100755 --- a/tests/qemu-iotests/qcow2.py +++ b/tests/qemu-iotests/qcow2.py @@ -5,6 +5,88 @@ import struct import string =20 =20 +class Qcow2BitmapDirEntry: + + name =3D '' + + uint8_t =3D 'B' + uint16_t =3D 'H' + uint32_t =3D 'I' + uint64_t =3D 'Q' + + fields =3D [ + [uint64_t, '%#x', 'bitmap_table_offset'], + [uint32_t, '%d', 'bitmap_table_size'], + [uint32_t, '%d', 'flag_bits'], + [uint8_t, '%d', 'type'], + [uint8_t, '%d', 'granularity_bits'], + [uint16_t, '%d', 'name_size'], + [uint32_t, '%d', 'extra_data_size'] + ] + + fmt =3D '>' + ''.join(field[0] for field in fields) + + def __init__(self, data): + + entry =3D struct.unpack(Qcow2BitmapDirEntry.fmt, data) + self.__dict__ =3D dict((field[2], entry[i]) + for i, field in enumerate( + Qcow2BitmapDirEntry.fields)) + + self.bitmap_table_size =3D self.bitmap_table_size \ + * struct.calcsize(self.uint64_t) + + self.bitmap_flags =3D [] + BME_FLAG_IN_USE =3D 1 + BME_FLAG_AUTO =3D 1 << 1 + if (self.flag_bits & BME_FLAG_IN_USE) !=3D 0: + self.bitmap_flags.append("in-use") + if (self.flag_bits & BME_FLAG_AUTO) !=3D 0: + self.bitmap_flags.append("auto") + + def bitmap_dir_entry_raw_size(self): + return struct.calcsize(self.fmt) + self.name_size + \ + self.extra_data_size + + def dump_bitmap_dir_entry(self): + print("%-25s" % 'Bitmap name', self.name) + + for fl in self.bitmap_flags: + print("%-25s" % 'flag', fl) + + for f in Qcow2BitmapDirEntry.fields: + value =3D self.__dict__[f[2]] + value_str =3D f[1] % value + print("%-25s" % f[2], value_str) + + +class Qcow2BitmapDirectory: + + def __init__(self, bm_header_ext): + self.nb_bitmaps =3D bm_header_ext.nb_bitmaps + self.bitmap_directory_offset =3D bm_header_ext.bitmap_directory_of= fset + self.bitmap_directory_size =3D bm_header_ext.bitmap_directory_size + + def read_bitmap_directory(self, fd): + self.bitmaps =3D [] + fd.seek(self.bitmap_directory_offset) + buf_size =3D struct.calcsize(Qcow2BitmapDirEntry.fmt) + + for n in range(self.nb_bitmaps): + buf =3D fd.read(buf_size) + dir_entry =3D Qcow2BitmapDirEntry(buf) + fd.seek(dir_entry.extra_data_size, 1) + bitmap_name =3D fd.read(dir_entry.name_size) + dir_entry.name =3D bitmap_name.decode('ascii') + self.bitmaps.append(dir_entry) + entry_raw_size =3D dir_entry.bitmap_dir_entry_raw_size() + shift =3D ((entry_raw_size + 7) & ~7) - entry_raw_size + fd.seek(shift, 1) + + def get_bitmaps(self): + return self.bitmaps + + class Qcow2BitmapExt: =20 uint32_t =3D 'I' @@ -33,8 +115,21 @@ class Qcow2BitmapExt: print("%-25s" % f[2], value_str) print("") =20 + def read_bitmap_directory(self, fd): + bm_directory =3D Qcow2BitmapDirectory(self) + bm_directory.read_bitmap_directory(fd) + self.bitmaps =3D bm_directory.get_bitmaps() + + def load(self, fd): + self.read_bitmap_directory(fd) + + def dump_bitmap_directory(self): + for bm in self.bitmaps: + bm.dump_bitmap_dir_entry() + def dump_ext(self): self.dump_bitmap_ext() + self.dump_bitmap_directory() =20 =20 class QcowHeaderExtension: @@ -79,6 +174,10 @@ class QcowHeaderExtension: self.QCOW2_EXT_MAGIC_DATA_FILE: 'Data file', }.get(magic, 'Unknown') =20 + def load(self, fd): + if self.obj is not None: + self.obj.load(fd) + =20 class QcowHeader: =20 @@ -157,7 +256,10 @@ class QcowHeader: else: padded =3D (length + 7) & ~7 data =3D fd.read(padded) - self.extensions.append(QcowHeaderExtension(magic, length, = data)) + self.extensions.append(QcowHeaderExtension(magic, length, + data)) + for ex in self.extensions: + ex.load(fd) =20 def update_extensions(self, fd): =20 --=20 1.8.3.1