From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3ABC2C282CE for ; Tue, 4 Jun 2019 16:19:59 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 14D8E23CCA for ; Tue, 4 Jun 2019 16:19:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 14D8E23CCA 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:54870 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYCAI-0003lt-82 for qemu-devel@archiver.kernel.org; Tue, 04 Jun 2019 12:19:58 -0400 Received: from eggs.gnu.org ([209.51.188.92]:35822) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYC6D-000149-KJ for qemu-devel@nongnu.org; Tue, 04 Jun 2019 12:15:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hYC6A-0005fk-Mf for qemu-devel@nongnu.org; Tue, 04 Jun 2019 12:15:44 -0400 Received: from relay.sw.ru ([185.231.240.75]:41662) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hYC6A-0005C4-EL; Tue, 04 Jun 2019 12:15:42 -0400 Received: from [10.94.3.0] (helo=kvm.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1hYC5k-0005Pq-GR; Tue, 04 Jun 2019 19:15:16 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Tue, 4 Jun 2019 19:15:11 +0300 Message-Id: <20190604161514.262241-10-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190604161514.262241-1-vsementsov@virtuozzo.com> References: <20190604161514.262241-1-vsementsov@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 v2 09/12] block/io: introduce bdrv_co_p{read, write}v_part X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, kwolf@redhat.com, vsementsov@virtuozzo.com, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Introduce extended variants of bdrv_co_preadv and bdrv_co_pwritev with qiov_offset parameter. Signed-off-by: Vladimir Sementsov-Ogievskiy --- include/block/block_int.h | 6 ++++++ block/io.c | 29 +++++++++++++++++++++++------ 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/include/block/block_int.h b/include/block/block_int.h index 46e17d2e2f..8b7b5d5b84 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -940,9 +940,15 @@ extern BlockDriver bdrv_qcow2; int coroutine_fn bdrv_co_preadv(BdrvChild *child, int64_t offset, unsigned int bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); +int coroutine_fn bdrv_co_preadv_part(BdrvChild *child, + int64_t offset, unsigned int bytes, + QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); int coroutine_fn bdrv_co_pwritev(BdrvChild *child, int64_t offset, unsigned int bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); +int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child, + int64_t offset, unsigned int bytes, + QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); static inline int coroutine_fn bdrv_co_pread(BdrvChild *child, int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags) diff --git a/block/io.c b/block/io.c index 660c96527d..82051730fd 100644 --- a/block/io.c +++ b/block/io.c @@ -1534,7 +1534,8 @@ static void bdrv_padding_destroy(BdrvRequestPadding *pad) * * Function always succeeds. */ -static bool bdrv_pad_request(BlockDriverState *bs, QEMUIOVector **qiov, +static bool bdrv_pad_request(BlockDriverState *bs, + QEMUIOVector **qiov, size_t *qiov_offset, int64_t *offset, unsigned int *bytes, BdrvRequestPadding *pad) { @@ -1543,11 +1544,12 @@ static bool bdrv_pad_request(BlockDriverState *bs, QEMUIOVector **qiov, } qemu_iovec_init_extended(&pad->local_qiov, pad->buf, pad->head, - *qiov, 0, *bytes, + *qiov, *qiov_offset, *bytes, pad->buf + pad->buf_len - pad->tail, pad->tail); *bytes += pad->head + pad->tail; *offset -= pad->head; *qiov = &pad->local_qiov; + *qiov_offset = 0; return true; } @@ -1555,6 +1557,14 @@ static bool bdrv_pad_request(BlockDriverState *bs, QEMUIOVector **qiov, int coroutine_fn bdrv_co_preadv(BdrvChild *child, int64_t offset, unsigned int bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) +{ + return bdrv_co_preadv_part(child, offset, bytes, qiov, 0, flags); +} + +int coroutine_fn bdrv_co_preadv_part(BdrvChild *child, + int64_t offset, unsigned int bytes, + QEMUIOVector *qiov, size_t qiov_offset, + BdrvRequestFlags flags) { BlockDriverState *bs = child->bs; BdrvTrackedRequest req; @@ -1575,12 +1585,12 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child, flags |= BDRV_REQ_COPY_ON_READ; } - bdrv_pad_request(bs, &qiov, &offset, &bytes, &pad); + bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &bytes, &pad); tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_READ); ret = bdrv_aligned_preadv(child, &req, offset, bytes, bs->bl.request_alignment, - qiov, 0, flags); + qiov, qiov_offset, flags); tracked_request_end(&req); bdrv_dec_in_flight(bs); @@ -1943,6 +1953,13 @@ out: int coroutine_fn bdrv_co_pwritev(BdrvChild *child, int64_t offset, unsigned int bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) +{ + return bdrv_co_pwritev_part(child, offset, bytes, qiov, 0, flags); +} + +int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child, + int64_t offset, unsigned int bytes, QEMUIOVector *qiov, size_t qiov_offset, + BdrvRequestFlags flags) { BlockDriverState *bs = child->bs; BdrvTrackedRequest req; @@ -1974,14 +1991,14 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child, goto out; } - if (bdrv_pad_request(bs, &qiov, &offset, &bytes, &pad)) { + if (bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &bytes, &pad)) { mark_request_serialising(&req, align); wait_serialising_requests(&req); bdrv_padding_rmw_read(child, &req, &pad, false); } ret = bdrv_aligned_pwritev(child, &req, offset, bytes, align, - qiov, 0, flags); + qiov, qiov_offset, flags); bdrv_padding_destroy(&pad); -- 2.18.0