From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41049) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dYCK0-0008BX-Kl for qemu-devel@nongnu.org; Thu, 20 Jul 2017 10:20:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dYCJy-0007uT-UP for qemu-devel@nongnu.org; Thu, 20 Jul 2017 10:20:56 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:41686 helo=mx01.kamp.de) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dYCJy-0007tj-Ka for qemu-devel@nongnu.org; Thu, 20 Jul 2017 10:20:54 -0400 From: Peter Lieven Date: Thu, 20 Jul 2017 16:20:39 +0200 Message-Id: <1500560441-5670-9-git-send-email-pl@kamp.de> In-Reply-To: <1500560441-5670-1-git-send-email-pl@kamp.de> References: <1500560441-5670-1-git-send-email-pl@kamp.de> Subject: [Qemu-devel] [PATCH V4 08/10] block/qcow2: start using the compress format extension List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, lersek@redhat.com, den@openvz.org, mreitz@redhat.com, eblake@redhat.com, berrange@redhat.com, Peter Lieven we now pass the parameters to the zlib compressor if the extension is present and use the old default values if the extension is absent. Signed-off-by: Peter Lieven --- block/qcow2-cluster.c | 58 ++++++++++++++++++++++++++++++--------------------- block/qcow2.c | 57 +++++++++++++++++++++++++++----------------------- 2 files changed, 65 insertions(+), 50 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index f06c08f..6c14d59 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1479,30 +1479,39 @@ again: } static int decompress_buffer(uint8_t *out_buf, int out_buf_size, - const uint8_t *buf, int buf_size) + const uint8_t *buf, int buf_size, + int compress_format) { - z_stream strm1, *strm = &strm1; - int ret, out_len; - - memset(strm, 0, sizeof(*strm)); - - strm->next_in = (uint8_t *)buf; - strm->avail_in = buf_size; - strm->next_out = out_buf; - strm->avail_out = out_buf_size; - - ret = inflateInit2(strm, -12); - if (ret != Z_OK) - return -1; - ret = inflate(strm, Z_FINISH); - out_len = strm->next_out - out_buf; - if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || - out_len != out_buf_size) { - inflateEnd(strm); - return -1; - } - inflateEnd(strm); - return 0; + int ret = 0, out_len; + + switch (compress_format) { + case QCOW2_COMPRESS_FORMAT_ZLIB: + case -1: { + z_stream z_strm = {}; + + z_strm.next_in = (uint8_t *)buf; + z_strm.avail_in = buf_size; + z_strm.next_out = out_buf; + z_strm.avail_out = out_buf_size; + + ret = inflateInit2(&z_strm, -15); + if (ret != Z_OK) { + return -1; + } + ret = inflate(&z_strm, Z_FINISH); + out_len = z_strm.next_out - out_buf; + ret = -(ret != Z_STREAM_END); + inflateEnd(&z_strm); + break; + } + default: + abort(); /* should never reach this point */ + } + + if (out_len != out_buf_size) { + ret = -1; + } + return ret; } int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) @@ -1523,7 +1532,8 @@ int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) return ret; } if (decompress_buffer(s->cluster_cache, s->cluster_size, - s->cluster_data + sector_offset, csize) < 0) { + s->cluster_data + sector_offset, csize, + s->compress_format) < 0) { return -EIO; } s->cluster_cache_offset = coffset; diff --git a/block/qcow2.c b/block/qcow2.c index 978e8d2..57249cc 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -3391,9 +3391,10 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, BDRVQcow2State *s = bs->opaque; QEMUIOVector hd_qiov; struct iovec iov; - z_stream strm; - int ret, out_len; - uint8_t *buf, *out_buf, *local_buf = NULL; + z_stream z_strm = {}; + int z_windowBits = -15, z_level = Z_DEFAULT_COMPRESSION; + int ret, out_len = 0; + uint8_t *buf, *out_buf = NULL, *local_buf = NULL; uint64_t cluster_offset; if (bytes == 0) { @@ -3418,34 +3419,38 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, buf = qiov->iov[0].iov_base; } - out_buf = g_malloc(s->cluster_size); + switch (s->compress_format) { + case -1: + z_windowBits = -12; + case QCOW2_COMPRESS_FORMAT_ZLIB: + out_buf = g_malloc(s->cluster_size); + if (s->compress_level > 0) { + z_level = s->compress_level; + } - /* best compression, small window, no zlib header */ - memset(&strm, 0, sizeof(strm)); - ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, - Z_DEFLATED, -12, - 9, Z_DEFAULT_STRATEGY); - if (ret != 0) { - ret = -EINVAL; - goto fail; - } + ret = deflateInit2(&z_strm, z_level, Z_DEFLATED, z_windowBits, 9, + Z_DEFAULT_STRATEGY); + if (ret != Z_OK) { + ret = -EINVAL; + goto fail; + } - strm.avail_in = s->cluster_size; - strm.next_in = (uint8_t *)buf; - strm.avail_out = s->cluster_size; - strm.next_out = out_buf; + z_strm.avail_in = s->cluster_size; + z_strm.next_in = (uint8_t *)buf; + z_strm.avail_out = s->cluster_size; + z_strm.next_out = out_buf; - ret = deflate(&strm, Z_FINISH); - if (ret != Z_STREAM_END && ret != Z_OK) { - deflateEnd(&strm); - ret = -EINVAL; - goto fail; - } - out_len = strm.next_out - out_buf; + ret = deflate(&z_strm, Z_FINISH); + out_len = z_strm.next_out - out_buf; + deflateEnd(&z_strm); - deflateEnd(&strm); + ret = ret != Z_STREAM_END; + break; + default: + abort(); /* should never reach this point */ + } - if (ret != Z_STREAM_END || out_len >= s->cluster_size) { + if (ret || out_len >= s->cluster_size) { /* could not compress: write normal cluster */ ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0); if (ret < 0) { -- 1.9.1