From nobody Sun Feb 8 01:33:25 2026 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=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1567611218; cv=none; d=zoho.com; s=zohoarc; b=NmZq9bjiXr9on7Rc3hHDVjuXLub+z7Gv1Kuo0PWz/VkDwurXiIS8oPQMIWn9thXyVHuCpE4AcnGkNh8uXtiIJy1xuma5WgIvBkmkG3z1Q0ini6A1y8xgfuCCqLFD8t456E3U5ikwCbsfs6EryDMpWOVVDG3jg+I8g2s1kxWnUw8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1567611218; 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:ARC-Authentication-Results; bh=WSNGwNfTJQy5Lgl3HjLvpMOpbKX2H71cps8Onzn8C7k=; b=neV8yNX1brjUjHRol6h97uxRjWSSqFYSiSbQXOjzTEJx3OPqB9nTPPStuVt8yRI8HKlBGMjWxU7oyAELxdLev3ZqxOXg5IYbWi8Wwhztue783c6V+i5So7mzfODYmcOFmHA74S3JSY9W/BsUAW96ejfOYF8js0IvEAqt8ZpWn9Y= 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 1567611218151709.8016459644838; Wed, 4 Sep 2019 08:33:38 -0700 (PDT) Received: from localhost ([::1]:34518 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5XHq-000840-4W for importer@patchew.org; Wed, 04 Sep 2019 11:33:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60366) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5XDr-0005sk-0w for qemu-devel@nongnu.org; Wed, 04 Sep 2019 11:29:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i5XDp-00030i-Fi for qemu-devel@nongnu.org; Wed, 04 Sep 2019 11:29:26 -0400 Received: from relay.sw.ru ([185.231.240.75]:60750) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i5XDp-0002zt-81; Wed, 04 Sep 2019 11:29:25 -0400 Received: from [10.94.4.71] (helo=dptest2.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92) (envelope-from ) id 1i5XDm-0000Me-S1; Wed, 04 Sep 2019 18:29:22 +0300 From: Denis Plotnikov To: armbru@redhat.com, qemu-devel@nongnu.org Date: Wed, 4 Sep 2019 18:29:14 +0300 Message-Id: <20190904152915.30755-3-dplotnikov@virtuozzo.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20190904152915.30755-1-dplotnikov@virtuozzo.com> References: <20190904152915.30755-1-dplotnikov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v5 2/3] qcow2: rework the cluster compression routine 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, den@virtuozzo.com, qemu-block@nongnu.org, mreitz@redhat.com 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" The patch allow to process image compression type defined in the image header and choose an appropriate method for image clusters (de)compression. Signed-off-by: Denis Plotnikov Reviewed-by: Eric Blake --- block/qcow2-threads.c | 77 +++++++++++++++++++++++++++++++++++-------- 1 file changed, 63 insertions(+), 14 deletions(-) diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c index 3b1e63fe41..ebeef9e568 100644 --- a/block/qcow2-threads.c +++ b/block/qcow2-threads.c @@ -74,7 +74,9 @@ typedef struct Qcow2CompressData { } Qcow2CompressData; =20 /* - * qcow2_compress() + * qcow2_zlib_compress() + * + * Compress @src_size bytes of data using zlib compression method * * @dest - destination buffer, @dest_size bytes * @src - source buffer, @src_size bytes @@ -83,8 +85,8 @@ typedef struct Qcow2CompressData { * -ENOMEM destination buffer is not enough to store compressed d= ata * -EIO on any other error */ -static ssize_t qcow2_compress(void *dest, size_t dest_size, - const void *src, size_t src_size) +static ssize_t qcow2_zlib_compress(void *dest, size_t dest_size, + const void *src, size_t src_size) { ssize_t ret; z_stream strm; @@ -119,19 +121,19 @@ static ssize_t qcow2_compress(void *dest, size_t dest= _size, } =20 /* - * qcow2_decompress() + * qcow2_zlib_decompress() * * Decompress some data (not more than @src_size bytes) to produce exactly - * @dest_size bytes. + * @dest_size bytes using zlib compression method * * @dest - destination buffer, @dest_size bytes * @src - source buffer, @src_size bytes * * Returns: 0 on success - * -1 on fail + * -EIO on failure */ -static ssize_t qcow2_decompress(void *dest, size_t dest_size, - const void *src, size_t src_size) +static ssize_t qcow2_zlib_decompress(void *dest, size_t dest_size, + const void *src, size_t src_size) { int ret =3D 0; z_stream strm; @@ -144,7 +146,7 @@ static ssize_t qcow2_decompress(void *dest, size_t dest= _size, =20 ret =3D inflateInit2(&strm, -12); if (ret !=3D Z_OK) { - return -1; + return -EIO; } =20 ret =3D inflate(&strm, Z_FINISH); @@ -154,7 +156,7 @@ static ssize_t qcow2_decompress(void *dest, size_t dest= _size, * @src buffer may be processed partly (because in qcow2 we know s= ize of * compressed data with precision of one sector) */ - ret =3D -1; + ret =3D -EIO; } =20 inflateEnd(&strm); @@ -189,20 +191,67 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest= , size_t dest_size, return arg.ret; } =20 +/* + * qcow2_co_compress() + * + * Compress @src_size bytes of data using the compression + * method defined by the image compression type + * + * @dest - destination buffer, @dest_size bytes + * @src - source buffer, @src_size bytes + * + * Returns: 0 on success + * a negative error code on failure + */ ssize_t coroutine_fn qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size, const void *src, size_t src_size) { - return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, - qcow2_compress); + BDRVQcow2State *s =3D bs->opaque; + Qcow2CompressFunc fn; + + switch (s->compression_type) { + case QCOW2_COMPRESSION_TYPE_ZLIB: + fn =3D qcow2_zlib_compress; + break; + + default: + return -ENOTSUP; + } + + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn); } =20 +/* + * qcow2_co_decompress() + * + * Decompress some data (not more than @src_size bytes) to produce exactly + * @dest_size bytes using the compression method defined by the image + * compression type + * + * @dest - destination buffer, @dest_size bytes + * @src - source buffer, @src_size bytes + * + * Returns: 0 on success + * a negative error code on failure + */ ssize_t coroutine_fn qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size, const void *src, size_t src_size) { - return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, - qcow2_decompress); + BDRVQcow2State *s =3D bs->opaque; + Qcow2CompressFunc fn; + + switch (s->compression_type) { + case QCOW2_COMPRESSION_TYPE_ZLIB: + fn =3D qcow2_zlib_decompress; + break; + + default: + return -ENOTSUP; + } + + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn); } =20 =20 --=20 2.17.0