From nobody Thu Nov 13 23:29:24 2025 Delivered-To: importer@patchew.org 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; 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=1583233282; cv=none; d=zohomail.com; s=zohoarc; b=B7FbjTW6FWY1HdvkU+MjaNj963jtrVMi8jfLz4j1GR93tnhFAv140lc/v7ureV1gpWFVal+pSK/IPijfna+8HMXHAyKxO+lBKHqMkF4YW9RgjjapH8MTKRt9QVhRR9w7J0C31/p4fDgEDDrFG5WGqFnDIQHSdcdBwZYmTEd5k3U= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1583233282; 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=TeZ1tl8RGS9xCAkvDvKEydCZCM2XJz6EXSnh48HM9Cw=; b=AxFMCZHV3lxW1DCarISs3WhsnHWingsneZb1sARkCCN38o70Nc1sddEWrlI+toGUbYjrDH2NrZGYv7DHSuBqTLjL/5ym7IEDZsCD0IzT+DGZpFyARuLzLmM7dhvvuGgG+d4ICo04ng0YesxwguiaquYxp7R3DX+bLJTklCaX3eU= 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 1583233282249307.83286025129973; Tue, 3 Mar 2020 03:01:22 -0800 (PST) Received: from localhost ([::1]:45492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j95Ie-0000JD-1o for importer@patchew.org; Tue, 03 Mar 2020 06:01:20 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:60810) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j95HT-0007gY-SH for qemu-devel@nongnu.org; Tue, 03 Mar 2020 06:00:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j95HS-0000RO-Ec for qemu-devel@nongnu.org; Tue, 03 Mar 2020 06:00:07 -0500 Received: from relay.sw.ru ([185.231.240.75]:44582) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j95HS-0000Qh-5W; Tue, 03 Mar 2020 06:00:06 -0500 Received: from dptest2.qa.sw.ru ([10.94.4.71]) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1j95HJ-000499-Kl; Tue, 03 Mar 2020 13:59:57 +0300 From: Denis Plotnikov To: qemu-devel@nongnu.org Subject: [PATCH v3 2/4] qcow2: rework the cluster compression routine Date: Tue, 3 Mar 2020 13:59:48 +0300 Message-Id: <20200303105950.26744-3-dplotnikov@virtuozzo.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20200303105950.26744-1-dplotnikov@virtuozzo.com> References: <20200303105950.26744-1-dplotnikov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 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-block@nongnu.org, armbru@redhat.com, mreitz@redhat.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" The patch enables processing the image compression type defined for the image and chooses an appropriate method for image clusters (de)compression. Signed-off-by: Denis Plotnikov --- 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 77bb578cdf..9288a4f852 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: compressed size 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: + abort(); + } + + 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