From patchwork Tue May 15 15:40:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 913806 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40ljW0717Rz9s08 for ; Wed, 16 May 2018 02:21:32 +1000 (AEST) Received: from localhost ([::1]:44991 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fIche-00068B-Ja for incoming@patchwork.ozlabs.org; Tue, 15 May 2018 12:21:30 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39104) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fIc4f-0006xq-PI for qemu-devel@nongnu.org; Tue, 15 May 2018 11:41:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fIc4b-0001i6-Nu for qemu-devel@nongnu.org; Tue, 15 May 2018 11:41:13 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36672 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fIc4Y-0001cs-MN; Tue, 15 May 2018 11:41:06 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 43AC040201A4; Tue, 15 May 2018 15:41:06 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-117-164.ams2.redhat.com [10.36.117.164]) by smtp.corp.redhat.com (Postfix) with ESMTP id 953032024CBA; Tue, 15 May 2018 15:41:05 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Tue, 15 May 2018 17:40:24 +0200 Message-Id: <20180515154033.19899-29-kwolf@redhat.com> In-Reply-To: <20180515154033.19899-1-kwolf@redhat.com> References: <20180515154033.19899-1-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 15 May 2018 15:41:06 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 15 May 2018 15:41:06 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'kwolf@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PULL 28/37] block/quorum: Support BDRV_REQ_WRITE_UNCHANGED 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: kwolf@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Max Reitz We just need to forward it to quorum's children (except in case of a rewrite because of corruption), but for that we first have to support flags in child requests at all. Signed-off-by: Max Reitz Reviewed-by: Stefan Hajnoczi Reviewed-by: Alberto Garcia Message-id: 20180421132929.21610-6-mreitz@redhat.com Reviewed-by: Kevin Wolf Signed-off-by: Max Reitz --- block/quorum.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/block/quorum.c b/block/quorum.c index a5051da56e..e448d7e384 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -115,6 +115,7 @@ struct QuorumAIOCB { /* Request metadata */ uint64_t offset; uint64_t bytes; + int flags; QEMUIOVector *qiov; /* calling IOV */ @@ -157,7 +158,8 @@ static bool quorum_64bits_compare(QuorumVoteValue *a, QuorumVoteValue *b) static QuorumAIOCB *quorum_aio_get(BlockDriverState *bs, QEMUIOVector *qiov, uint64_t offset, - uint64_t bytes) + uint64_t bytes, + int flags) { BDRVQuorumState *s = bs->opaque; QuorumAIOCB *acb = g_new(QuorumAIOCB, 1); @@ -168,6 +170,7 @@ static QuorumAIOCB *quorum_aio_get(BlockDriverState *bs, .bs = bs, .offset = offset, .bytes = bytes, + .flags = flags, .qiov = qiov, .votes.compare = quorum_sha256_compare, .votes.vote_list = QLIST_HEAD_INITIALIZER(acb.votes.vote_list), @@ -271,9 +274,11 @@ static void quorum_rewrite_entry(void *opaque) BDRVQuorumState *s = acb->bs->opaque; /* Ignore any errors, it's just a correction attempt for already - * corrupted data. */ + * corrupted data. + * Mask out BDRV_REQ_WRITE_UNCHANGED because this overwrites the + * area with different data from the other children. */ bdrv_co_pwritev(s->children[co->idx], acb->offset, acb->bytes, - acb->qiov, 0); + acb->qiov, acb->flags & ~BDRV_REQ_WRITE_UNCHANGED); /* Wake up the caller after the last rewrite */ acb->rewrite_count--; @@ -673,7 +678,7 @@ static int quorum_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) { BDRVQuorumState *s = bs->opaque; - QuorumAIOCB *acb = quorum_aio_get(bs, qiov, offset, bytes); + QuorumAIOCB *acb = quorum_aio_get(bs, qiov, offset, bytes, flags); int ret; acb->is_read = true; @@ -699,7 +704,7 @@ static void write_quorum_entry(void *opaque) sacb->bs = s->children[i]->bs; sacb->ret = bdrv_co_pwritev(s->children[i], acb->offset, acb->bytes, - acb->qiov, 0); + acb->qiov, acb->flags); if (sacb->ret == 0) { acb->success_count++; } else { @@ -719,7 +724,7 @@ static int quorum_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) { BDRVQuorumState *s = bs->opaque; - QuorumAIOCB *acb = quorum_aio_get(bs, qiov, offset, bytes); + QuorumAIOCB *acb = quorum_aio_get(bs, qiov, offset, bytes, flags); int i, ret; for (i = 0; i < s->num_children; i++) { @@ -961,6 +966,8 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, } s->next_child_index = s->num_children; + bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED; + g_free(opened); goto exit;