From patchwork Tue Oct 1 19:27:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 11169539 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5639113B1 for ; Tue, 1 Oct 2019 19:43:29 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 36499205C9 for ; Tue, 1 Oct 2019 19:43:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 36499205C9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:47200 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iFO3U-0000sW-6z for patchwork-qemu-devel@patchwork.kernel.org; Tue, 01 Oct 2019 15:43:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48312) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iFNo8-0004i9-Gp for qemu-devel@nongnu.org; Tue, 01 Oct 2019 15:27:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iFNo6-0001S6-UT for qemu-devel@nongnu.org; Tue, 01 Oct 2019 15:27:36 -0400 Received: from relay.sw.ru ([185.231.240.75]:45292) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iFNo6-0001Qj-N8; Tue, 01 Oct 2019 15:27:34 -0400 Received: from [172.16.25.136] (helo=dhcp-172-16-25-136.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.2) (envelope-from ) id 1iFNo3-00060a-Ay; Tue, 01 Oct 2019 22:27:31 +0300 From: Andrey Shinkevich To: qemu-devel@nongnu.org, qemu-block@nongnu.org Subject: [PATCH 3/6] block: support compressed write for copy-on-read Date: Tue, 1 Oct 2019 22:27:17 +0300 Message-Id: <1569958040-697220-4-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1569958040-697220-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1569958040-697220-1-git-send-email-andrey.shinkevich@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, fam@euphon.net, vsementsov@virtuozzo.com, jsnow@redhat.com, armbru@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Anton Nefedov Signed-off-by: Denis V. Lunev Signed-off-by: Andrey Shinkevich --- block/io.c | 21 ++++++++++++++++----- block/trace-events | 2 +- 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/block/io.c b/block/io.c index f8c3596..a7cd24f 100644 --- a/block/io.c +++ b/block/io.c @@ -1264,12 +1264,13 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child, * allocating cluster in the image file. Note that this value may exceed * BDRV_REQUEST_MAX_BYTES (even when the original read did not), which * is one reason we loop rather than doing it all at once. + * Also, this is crucial for compressed copy-on-read. */ bdrv_round_to_clusters(bs, offset, bytes, &cluster_offset, &cluster_bytes); skip_bytes = offset - cluster_offset; trace_bdrv_co_do_copy_on_readv(bs, offset, bytes, - cluster_offset, cluster_bytes); + cluster_offset, cluster_bytes, flags); while (cluster_bytes) { int64_t pnum; @@ -1328,9 +1329,15 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child, /* This does not change the data on the disk, it is not * necessary to flush even in cache=writethrough mode. */ - ret = bdrv_driver_pwritev(bs, cluster_offset, pnum, - &local_qiov, 0, - BDRV_REQ_WRITE_UNCHANGED); + if (flags & BDRV_REQ_WRITE_COMPRESSED) { + ret = bdrv_driver_pwritev_compressed(bs, cluster_offset, + pnum, &local_qiov, + qiov_offset); + } else { + ret = bdrv_driver_pwritev(bs, cluster_offset, pnum, + &local_qiov, 0, + BDRV_REQ_WRITE_UNCHANGED); + } } if (ret < 0) { @@ -1396,7 +1403,11 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child, * to pass through to drivers. For now, there aren't any * passthrough flags. */ assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ | - BDRV_REQ_PREFETCH))); + BDRV_REQ_PREFETCH | BDRV_REQ_WRITE_COMPRESSED))); + + /* write compressed only makes sense with copy on read */ + assert(!(flags & BDRV_REQ_WRITE_COMPRESSED) || + (flags & BDRV_REQ_COPY_ON_READ)); /* Handle Copy on Read and associated serialisation */ if (flags & BDRV_REQ_COPY_ON_READ) { diff --git a/block/trace-events b/block/trace-events index 3aa27e6..f444548 100644 --- a/block/trace-events +++ b/block/trace-events @@ -14,7 +14,7 @@ blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p" bdrv_co_preadv(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x" bdrv_co_pwritev(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x" bdrv_co_pwrite_zeroes(void *bs, int64_t offset, int count, int flags) "bs %p offset %"PRId64" count %d flags 0x%x" -bdrv_co_do_copy_on_readv(void *bs, int64_t offset, unsigned int bytes, int64_t cluster_offset, int64_t cluster_bytes) "bs %p offset %"PRId64" bytes %u cluster_offset %"PRId64" cluster_bytes %"PRId64 +bdrv_co_do_copy_on_readv(void *bs, int64_t offset, unsigned int bytes, int64_t cluster_offset, int64_t cluster_bytes, int flags) "bs %p offset %"PRId64" bytes %u cluster_offset %"PRId64" cluster_bytes %"PRId64" flags 0x%x" bdrv_co_copy_range_from(void *src, uint64_t src_offset, void *dst, uint64_t dst_offset, uint64_t bytes, int read_flags, int write_flags) "src %p offset %"PRIu64" dst %p offset %"PRIu64" bytes %"PRIu64" rw flags 0x%x 0x%x" bdrv_co_copy_range_to(void *src, uint64_t src_offset, void *dst, uint64_t dst_offset, uint64_t bytes, int read_flags, int write_flags) "src %p offset %"PRIu64" dst %p offset %"PRIu64" bytes %"PRIu64" rw flags 0x%x 0x%x"