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From 2ae5ce2fe476decb545f16c5af382e5959b2933a Mon Sep 17 00:00:00 2001
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Message-Id: <2ae5ce2fe476decb545f16c5af382e5959b2933a.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:09:19 +0100
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Subject: [PATCH 31/50] block drivers: expose requirement for write same
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alignment from formats
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-34-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56070
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 33/52] block drivers: expose requirement for write same alignment from formats
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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This will let misaligned but large requests use zero clusters. This
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is important because the cluster size is not guest visible.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Peter Lieven <pl@kamp.de>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit cffb1ec600de83f693a23578fc2f344c1af9b96f)
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Conflicts:
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block/qed.c
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---
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block/qcow2.c | 1 +
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block/qed.c | 1 +
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block/vmdk.c | 4 ++++
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3 files changed, 6 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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block/qcow2.c | 1 +
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block/qed.c | 1 +
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block/vmdk.c | 4 ++++
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3 files changed, 6 insertions(+)
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diff --git a/block/qcow2.c b/block/qcow2.c
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index bbba11f..bf1f66f 100644
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--- a/block/qcow2.c
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+++ b/block/qcow2.c
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@@ -717,6 +717,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
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}
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qemu_opts_del(opts);
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+ bs->bl.write_zeroes_alignment = s->cluster_sectors;
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if (s->use_lazy_refcounts && s->qcow_version < 3) {
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error_setg(errp, "Lazy refcounts require a qcow2 image with at least "
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diff --git a/block/qed.c b/block/qed.c
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index c470329..0805ba3 100644
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--- a/block/qed.c
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+++ b/block/qed.c
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@@ -495,6 +495,7 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
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}
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}
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+ bs->bl.write_zeroes_alignment = s->header.cluster_size >> BDRV_SECTOR_BITS;
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s->need_check_timer = qemu_new_timer_ns(vm_clock,
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qed_need_check_timer_cb, s);
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diff --git a/block/vmdk.c b/block/vmdk.c
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index 6d676e4..8662016 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -428,6 +428,10 @@ static int vmdk_add_extent(BlockDriverState *bs,
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extent->l2_size = l2_size;
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extent->cluster_sectors = flat ? sectors : cluster_sectors;
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+ if (!flat) {
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+ bs->bl.write_zeroes_alignment =
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+ MAX(bs->bl.write_zeroes_alignment, cluster_sectors);
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+ }
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if (s->num_extents > 1) {
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extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
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} else {
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--
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1.7.11.7
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