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From 79f400ed6efa42347cd551a4a2da3ba1688c431c Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 18 Jun 2018 18:04:51 +0200
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Subject: [PATCH 074/268] iotests: Test post-backing convert target behavior
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20180618180451.23808-3-mreitz@redhat.com>
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Patchwork-id: 80797
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 2/2] iotests: Test post-backing convert target behavior
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Bugzilla: 1527898
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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This adds a test case to 122 for what happens when you convert to a
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target with a backing file that is shorter than the target, and the
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image format does not support efficient zero writes (as is the case with
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qcow2 v2).
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Message-id: 20180501165750.19242-3-mreitz@redhat.com
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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(cherry picked from commit 0682854f899d03c78befce9f5aae4a7e37655d25)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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tests/qemu-iotests/122 | 42 ++++++++++++++++++++++++++++++++++++++++++
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tests/qemu-iotests/122.out | 18 ++++++++++++++++++
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2 files changed, 60 insertions(+)
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diff --git a/tests/qemu-iotests/122 b/tests/qemu-iotests/122
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index 45b359c..d8c8ad7 100755
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--- a/tests/qemu-iotests/122
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+++ b/tests/qemu-iotests/122
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@@ -77,6 +77,48 @@ $QEMU_IO -c "read -P 0 0 3M" "$TEST_IMG".orig 2>&1 | _filter_qemu_io | _filter_t
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echo
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+echo "=== Converting to an overlay larger than its backing file ==="
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+echo
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+
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+TEST_IMG="$TEST_IMG".base _make_test_img 256M
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+# Needs to be at least how much an L2 table covers
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+# (64 kB/entry * 64 kB / 8 B/entry = 512 MB)
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+# That way, qcow2 will yield at least two status request responses.
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+# With just a single response, it would always say "Allocated in the
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+# backing file", so the optimization qemu-img convert tries to do is
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+# done automatically. Once it has to be queried twice, however (and
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+# one of the queries is completely after the end of the backing file),
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+# the block layer will automatically add a ZERO flag that qemu-img
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+# convert used to follow up with a zero write to the target.
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+# We do not want such a zero write, however, because we are past the
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+# end of the backing file on the target as well, so we do not need to
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+# write anything there.
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+_make_test_img -b "$TEST_IMG".base 768M
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+
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+# Use compat=0.10 as the output so there is no zero cluster support
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+$QEMU_IMG convert -O $IMGFMT -B "$TEST_IMG".base -o compat=0.10 \
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+ "$TEST_IMG" "$TEST_IMG".orig
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+# See that nothing has been allocated past 64M
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+$QEMU_IMG map "$TEST_IMG".orig | _filter_qemu_img_map
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+
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+echo
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+
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+# Just before the end of the backing file
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+$QEMU_IO -c 'write -P 0x11 255M 1M' "$TEST_IMG".base 2>&1 | _filter_qemu_io
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+# Somewhere in the second L2 table
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+$QEMU_IO -c 'write -P 0x22 600M 1M' "$TEST_IMG" 2>&1 | _filter_qemu_io
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+
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+$QEMU_IMG convert -O $IMGFMT -B "$TEST_IMG".base -o compat=0.10 \
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+ "$TEST_IMG" "$TEST_IMG".orig
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+
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+$QEMU_IMG map "$TEST_IMG".orig | _filter_qemu_img_map
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+$QEMU_IO -c 'read -P 0x11 255M 1M' \
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+ -c 'read -P 0x22 600M 1M' \
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+ "$TEST_IMG".orig \
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+ | _filter_qemu_io
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+
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+
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+echo
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echo "=== Concatenate multiple source images ==="
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echo
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diff --git a/tests/qemu-iotests/122.out b/tests/qemu-iotests/122.out
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index 47d8656..6c7ee1d 100644
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--- a/tests/qemu-iotests/122.out
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+++ b/tests/qemu-iotests/122.out
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@@ -28,6 +28,24 @@ read 3145728/3145728 bytes at offset 0
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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read 3145728/3145728 bytes at offset 0
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+=== Converting to an overlay larger than its backing file ===
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=268435456
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=805306368 backing_file=TEST_DIR/t.IMGFMT.base
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+Offset Length File
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+wrote 1048576/1048576 bytes at offset 267386880
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+wrote 1048576/1048576 bytes at offset 629145600
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+Offset Length File
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+0xff00000 0x100000 TEST_DIR/t.IMGFMT.base
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+0x25800000 0x100000 TEST_DIR/t.IMGFMT.orig
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+read 1048576/1048576 bytes at offset 267386880
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+read 1048576/1048576 bytes at offset 629145600
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
=== Concatenate multiple source images ===
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
Formatting 'TEST_DIR/t.IMGFMT.1', fmt=IMGFMT size=4194304
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
1.8.3.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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