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qemu/tests/qemu-iotests/024
Andrey Drobyshev f93e65ee51 iotests/{024, 271}: add testcases for qemu-img rebase 
As the previous commit changes the logic of "qemu-img rebase" (it's using
write alignment now), let's add a couple more test cases which would
ensure it works correctly.  In particular, the following scenarios:

024: add test case for rebase within one backing chain when the overlay
     cluster size > backings cluster size;
271: add test case for rebase images that contain subclusters.  Check
     that no extra allocations are being made.

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20230919165804.439110-7-andrey.drobyshev@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-10-31 13:51:28 +01:00

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#!/usr/bin/env bash
# group: rw backing auto quick
#
# Rebasing COW images
#
# Copyright (C) 2009 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# creator
owner=kwolf@redhat.com
seq=`basename $0`
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
_rm_test_img "$TEST_DIR/t.$IMGFMT.base_old"
_rm_test_img "$TEST_DIR/t.$IMGFMT.base_new"
_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_old"
_rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_new"
rmdir "$TEST_DIR/subdir" 2> /dev/null
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.pattern
# Currently only qcow2 and qed support rebasing
_supported_fmt qcow2 qed
_supported_proto file
_supported_os Linux
CLUSTER_SIZE=65536
# Cluster allocations to be tested:
#
# Backing (old) 11 -- 11 -- 11 -- 11 --
# Backing (new) 22 22 -- -- 22 22 -- --
# COW image 33 33 33 33 -- -- -- --
#
# The pattern is written twice to have both an alloc -> non-alloc and a
# non-alloc -> alloc transition in the COW image.
echo "Creating backing file"
echo
TEST_IMG_SAVE="$TEST_IMG"
TEST_IMG="$TEST_IMG.base_old"
_make_test_img 1G
io_pattern writev 0 $CLUSTER_SIZE $((2 * CLUSTER_SIZE)) 8 0x11
TEST_IMG="$TEST_IMG_SAVE.base_new"
echo "Creating new backing file"
echo
_make_test_img 1G
io_pattern writev 0 $((2 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 4 0x22
TEST_IMG="$TEST_IMG_SAVE"
echo "Creating COW image"
echo
_make_test_img -b "$TEST_IMG.base_old" -F $IMGFMT 1G
io_pattern writev 0 $((4 * CLUSTER_SIZE)) 0 1 0x33
io_pattern writev $((8 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 0 1 0x33
echo "Read before the rebase to make sure everything is set up correctly"
echo
io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
echo
echo Rebase and test again
echo
$QEMU_IMG rebase -b "$TEST_IMG.base_new" -F $IMGFMT "$TEST_IMG"
io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
echo
echo "=== Test rebase in a subdirectory of the working directory ==="
echo
# Clean up the old images beforehand so they do not interfere with
# this test
_cleanup
mkdir "$TEST_DIR/subdir"
# Relative to the overlay
BASE_OLD_OREL="t.$IMGFMT.base_old"
BASE_NEW_OREL="t.$IMGFMT.base_new"
# Relative to $TEST_DIR (which is going to be our working directory)
OVERLAY_WREL="subdir/t.$IMGFMT"
BASE_OLD="$TEST_DIR/subdir/$BASE_OLD_OREL"
BASE_NEW="$TEST_DIR/subdir/$BASE_NEW_OREL"
OVERLAY="$TEST_DIR/$OVERLAY_WREL"
# Test done here:
#
# Backing (old): 11 11 -- 11
# Backing (new): -- 22 22 11
# Overlay: -- -- -- --
#
# Rebasing works, we have verified that above. Here, we just want to
# see that rebasing is done for the correct target backing file.
TEST_IMG=$BASE_OLD _make_test_img 1M
TEST_IMG=$BASE_NEW _make_test_img 1M
TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD_OREL" -F $IMGFMT 1M
echo
$QEMU_IO "$BASE_OLD" \
-c "write -P 0x11 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
-c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
| _filter_qemu_io
$QEMU_IO "$BASE_NEW" \
-c "write -P 0x22 $((1 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
-c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
| _filter_qemu_io
echo
pushd "$TEST_DIR" >/dev/null
$QEMU_IMG rebase -f "$IMGFMT" -b "$BASE_NEW_OREL" -F $IMGFMT "$OVERLAY_WREL"
popd >/dev/null
# Verify the backing path is correct
TEST_IMG=$OVERLAY _img_info | grep '^backing file:'
echo
# Verify the data is correct
$QEMU_IO "$OVERLAY" \
-c "read -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
-c "read -P 0x11 $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
-c "read -P 0x00 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
-c "read -P 0x11 $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
| _filter_qemu_io
echo
# Verify that cluster #3 is not allocated (because it is the same in
# $BASE_OLD and $BASE_NEW)
$QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
# Check that rebase within the chain is working when
# overlay_size > old_backing_size
#
# base_new <-- base_old <-- overlay
#
# Backing (new): 11 11 11 11 11
# Backing (old): 22 22 22 22
# Overlay: -- -- -- -- --
#
# As a result, overlay should contain data identical to base_old, with the
# last cluster remaining unallocated.
echo
echo "=== Test rebase within one backing chain ==="
echo
echo "Creating backing chain"
echo
TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 5 ))
TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
$(( CLUSTER_SIZE * 4 ))
TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD" -F $IMGFMT \
$(( CLUSTER_SIZE * 5 ))
echo
echo "Fill backing files with data"
echo
$QEMU_IO "$BASE_NEW" -c "write -P 0x11 0 $(( CLUSTER_SIZE * 5 ))" \
| _filter_qemu_io
$QEMU_IO "$BASE_OLD" -c "write -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
| _filter_qemu_io
echo
echo "Check the last cluster is zeroed in overlay before the rebase"
echo
$QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
| _filter_qemu_io
echo
echo "Rebase onto another image in the same chain"
echo
$QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
echo "Verify that data is read the same before and after rebase"
echo
# Verify the first 4 clusters are still read the same as in the old base
$QEMU_IO "$OVERLAY" -c "read -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
| _filter_qemu_io
# Verify the last cluster still reads as zeroes
$QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
| _filter_qemu_io
echo
# Check that rebase within the chain is working when
# overlay cluster size > backings cluster size
# (here overlay cluster size == 2 * backings cluster size)
#
# base_new <-- base_old <-- overlay
#
# Backing (new): -- -- -- -- -- --
# Backing (old): -- 11 -- -- 22 --
# Overlay: |-- --|-- --|-- --|
#
# We should end up having 1st and 3rd cluster allocated, and their halves
# being read as zeroes.
echo
echo "=== Test rebase with different cluster sizes ==="
echo
echo "Creating backing chain"
echo
TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 6 ))
TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
$(( CLUSTER_SIZE * 6 ))
CLUSTER_SIZE=$(( CLUSTER_SIZE * 2 )) TEST_IMG=$OVERLAY \
_make_test_img -b "$BASE_OLD" -F $IMGFMT $(( CLUSTER_SIZE * 6 ))
TEST_IMG=$OVERLAY _img_info
echo
echo "Fill backing files with data"
echo
$QEMU_IO "$BASE_OLD" -c "write -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
-c "write -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
| _filter_qemu_io
echo
echo "Rebase onto another image in the same chain"
echo
$QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
echo "Verify that data is read the same before and after rebase"
echo
$QEMU_IO "$OVERLAY" -c "read -P 0x00 0 $CLUSTER_SIZE" \
-c "read -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
-c "read -P 0x00 $(( CLUSTER_SIZE * 2 )) $(( CLUSTER_SIZE * 2 ))" \
-c "read -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
-c "read -P 0x00 $(( CLUSTER_SIZE * 5 )) $CLUSTER_SIZE" \
| _filter_qemu_io
echo
echo "Verify that untouched cluster remains unallocated"
echo
$QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
echo
# success, all done
echo "*** done"
rm -f $seq.full
status=0
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