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iotests/{024, 271}: add testcases for qemu-img rebase

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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>
This commit is contained in:
Andrey Drobyshev 2023-09-19 19:58:02 +03:00 • committed by Kevin Wolf
parent 12df580b3b
commit f93e65ee51
4 changed files with 211 additions and 0 deletions
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60
tests/qemu-iotests/024
View file

@ -257,6 +257,66 @@ $QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
echo
# Check that rebase within the chain is working when
# overlay cluster size > backings cluster size
# (here overlay cluster size == 2 * backings cluster size)
#
# base_new <-- base_old <-- overlay
#
# Backing (new): -- -- -- -- -- --
# Backing (old): -- 11 -- -- 22 --
# Overlay: |-- --|-- --|-- --|
#
# We should end up having 1st and 3rd cluster allocated, and their halves
# being read as zeroes.
echo
echo "=== Test rebase with different cluster sizes ==="
echo
echo "Creating backing chain"
echo
TEST_IMG=$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