From patchwork Wed Jul 3 11:00:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Denis Plotnikov X-Patchwork-Id: 11029351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C5D111398 for ; Wed, 3 Jul 2019 11:07:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A93C92879E for ; Wed, 3 Jul 2019 11:07:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 810CD287B5; Wed, 3 Jul 2019 11:07:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EC7EE2879E for ; Wed, 3 Jul 2019 11:07:07 +0000 (UTC) Received: from localhost ([::1]:34906 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hid6R-0007Ao-Aw for patchwork-qemu-devel@patchwork.kernel.org; Wed, 03 Jul 2019 07:07:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59819) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hid15-0000Wt-0R for qemu-devel@nongnu.org; Wed, 03 Jul 2019 07:01:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hid0q-0004Wb-Kk for qemu-devel@nongnu.org; Wed, 03 Jul 2019 07:01:26 -0400 Received: from relay.sw.ru ([185.231.240.75]:59422) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hid0V-0003pD-58; Wed, 03 Jul 2019 07:00:59 -0400 Received: from [10.94.4.71] (helo=dptest2.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92) (envelope-from ) id 1hid0P-0004EW-JD; Wed, 03 Jul 2019 14:00:53 +0300 From: Denis Plotnikov To: kwolf@redhat.com, mreitz@redhat.com, eblake@redhat.com, armbru@redhat.com Date: Wed, 3 Jul 2019 14:00:43 +0300 Message-Id: <20190703110044.25610-3-dplotnikov@virtuozzo.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20190703110044.25610-1-dplotnikov@virtuozzo.com> References: <20190703110044.25610-1-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 v1 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: vsementsov@virtuozzo.com, den@virtuozzo.com, qemu-block@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 --- block/qcow2.c | 93 ++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 73 insertions(+), 20 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 921eb67b80..37a563a671 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -4005,8 +4005,11 @@ fail: } /* - * qcow2_compress() + * qcow2_zlib_compress() * + * Compress @src_size bytes of data using zlib compression method + * + * @dest_size bytes. * @dest - destination buffer, @dest_size bytes * @src - source buffer, @src_size bytes * @@ -4014,8 +4017,8 @@ fail: * -1 destination buffer is not enough to store compressed data * -2 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; @@ -4025,7 +4028,7 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size, ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -12, 9, Z_DEFAULT_STRATEGY); if (ret != Z_OK) { - return -2; + return -EIO; } /* strm.next_in is not const in old zlib versions, such as those used on @@ -4039,7 +4042,7 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size, if (ret == Z_STREAM_END) { ret = dest_size - strm.avail_out; } else { - ret = (ret == Z_OK ? -1 : -2); + ret = (ret == Z_OK ? -ENOMEM : -EIO); } deflateEnd(&strm); @@ -4048,10 +4051,10 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size, } /* - * 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 @@ -4059,8 +4062,8 @@ static ssize_t qcow2_compress(void *dest, size_t dest_size, * Returns: 0 on success * -1 on fail */ -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 = 0; z_stream strm; @@ -4073,7 +4076,7 @@ static ssize_t qcow2_decompress(void *dest, size_t dest_size, ret = inflateInit2(&strm, -12); if (ret != Z_OK) { - return -1; + return -EIO; } ret = inflate(&strm, Z_FINISH); @@ -4081,7 +4084,7 @@ static ssize_t qcow2_decompress(void *dest, size_t dest_size, /* We approve Z_BUF_ERROR because we need @dest buffer to be filled, but * @src buffer may be processed partly (because in qcow2 we know size of * compressed data with precision of one sector) */ - ret = -1; + ret = -EIO; } inflateEnd(&strm); @@ -4153,20 +4156,67 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size, return arg.ret; } +/* + * 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 fail + */ static 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 = bs->opaque; + Qcow2CompressFunc fn; + + switch (s->compression_type) { + case QCOW2_COMPRESSION_TYPE_ZLIB: + fn = qcow2_zlib_compress; + break; + + default: + return -ENOTSUP; + } + + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn); } +/* + * 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 fail + */ static 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 = bs->opaque; + Qcow2CompressFunc fn; + + switch (s->compression_type) { + case QCOW2_COMPRESSION_TYPE_ZLIB: + fn = qcow2_zlib_decompress; + break; + + default: + return -ENOTSUP; + } + + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, fn); } /* XXX: put compressed sectors first, then all the cluster aligned @@ -4178,7 +4228,7 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, BDRVQcow2State *s = bs->opaque; QEMUIOVector hd_qiov; int ret; - size_t out_len; + ssize_t out_len; uint8_t *buf, *out_buf; uint64_t cluster_offset; @@ -4217,16 +4267,19 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, out_len = qcow2_co_compress(bs, out_buf, s->cluster_size - 1, buf, s->cluster_size); - if (out_len == -2) { - ret = -EINVAL; - goto fail; - } else if (out_len == -1) { + if (out_len == -ENOMEM) { /* could not compress: write normal cluster */ ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0); if (ret < 0) { goto fail; } goto success; + } else if (out_len < 0) { + /* + * encounter other compression issues propagate error to the upper level + */ + ret = out_len; + goto fail; } qemu_co_mutex_lock(&s->lock);