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From 32791762f04b3342e9b10d1f553326cd01ea451f Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Mon, 15 Feb 2016 09:28:26 +0100
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Subject: [PATCH 13/18] vmdk: Fix index_in_cluster calculation in
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vmdk_co_get_block_status
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1455528511-9357-14-git-send-email-famz@redhat.com>
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Patchwork-id: 69179
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O-Subject: [RHEL-7.3 qemu-kvm PATCH 13/18] vmdk: Fix index_in_cluster calculation in vmdk_co_get_block_status
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Bugzilla: 1299250
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1299250
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It has the similar issue with b1649fae49a8. Since the calculation
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is repeated for a few times already, introduce a function so it can be
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reused.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 61f0ed1d54601b91b8195c1a30d7046f83283b40)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/vmdk.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/block/vmdk.c b/block/vmdk.c
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index dd8b638..10c08f3 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -1242,6 +1242,17 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
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return NULL;
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}
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+static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,
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+ int64_t sector_num)
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+{
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+ uint64_t index_in_cluster, extent_begin_sector, extent_relative_sector_num;
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+
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+ extent_begin_sector = extent->end_sector - extent->sectors;
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+ extent_relative_sector_num = sector_num - extent_begin_sector;
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+ index_in_cluster = extent_relative_sector_num % extent->cluster_sectors;
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+ return index_in_cluster;
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+}
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+
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static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, int *pnum)
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{
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@@ -1279,7 +1290,7 @@ static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
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break;
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}
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- index_in_cluster = sector_num % extent->cluster_sectors;
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+ index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num);
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n = extent->cluster_sectors - index_in_cluster;
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if (n > nb_sectors) {
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n = nb_sectors;
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--
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1.8.3.1
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