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From a36dfa1ce0b98a3144be892ef6ada29deaf9dcf8 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Fri, 29 Jun 2018 06:11:51 +0200
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Subject: [PATCH 177/268] qcow2: Fix src_offset in copy offloading
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20180629061153.12687-12-famz@redhat.com>
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Patchwork-id: 81163
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 11/13] qcow2: Fix src_offset in copy offloading
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Bugzilla: 1482537
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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Not updating src_offset will result in wrong data being written to dst
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image.
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Reported-by: Max Reitz <mreitz@redhat.com>
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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/qcow2.c | 1 +
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tests/qemu-iotests/063 | 9 +++++++++
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tests/qemu-iotests/063.out | 12 ++++++++++++
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3 files changed, 22 insertions(+)
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diff --git a/block/qcow2.c b/block/qcow2.c
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index c85ebcb..4404dc7 100644
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--- a/block/qcow2.c
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+++ b/block/qcow2.c
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@@ -3416,6 +3416,7 @@ qcow2_co_copy_range_to(BlockDriverState *bs,
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}
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bytes -= cur_bytes;
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+ src_offset += cur_bytes;
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dst_offset += cur_bytes;
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}
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ret = 0;
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diff --git a/tests/qemu-iotests/063 b/tests/qemu-iotests/063
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index e4f6ea9..adc037c 100755
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--- a/tests/qemu-iotests/063
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+++ b/tests/qemu-iotests/063
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@@ -91,6 +91,15 @@ if $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG.orig" "$TEST_IMG" >/dev
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exit 1
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fi
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+echo "== Regression testing for copy offloading bug =="
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+
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+_make_test_img 1M
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+TEST_IMG="$TEST_IMG.target" _make_test_img 1M
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+$QEMU_IO -c 'write -P 1 0 512k' -c 'write -P 2 512k 512k' "$TEST_IMG" | _filter_qemu_io
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+$QEMU_IO -c 'write -P 4 512k 512k' -c 'write -P 3 0 512k' "$TEST_IMG.target" | _filter_qemu_io
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+$QEMU_IMG convert -n -O $IMGFMT "$TEST_IMG" "$TEST_IMG.target"
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+$QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.target"
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+
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echo "*** done"
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rm -f $seq.full
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status=0
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diff --git a/tests/qemu-iotests/063.out b/tests/qemu-iotests/063.out
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index de1c99a..7b691b2 100644
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--- a/tests/qemu-iotests/063.out
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+++ b/tests/qemu-iotests/063.out
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@@ -7,4 +7,16 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4194304
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No errors were found on the image.
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== Testing conversion to a smaller file fails ==
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2097152
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+== Regression testing for copy offloading bug ==
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+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
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+Formatting 'TEST_DIR/t.IMGFMT.target', fmt=IMGFMT size=1048576
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+wrote 524288/524288 bytes at offset 0
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+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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+wrote 524288/524288 bytes at offset 524288
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+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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+wrote 524288/524288 bytes at offset 524288
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+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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+wrote 524288/524288 bytes at offset 0
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+512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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+Images are identical.
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*** done
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--
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1.8.3.1
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