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qemu-iotests: 024: add rebasing test case for overlay_size > backing_size

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Before previous commit, rebase was getting infitely stuck in case of
rebasing within the same backing chain and when overlay_size > backing_size.
Let's add this case to the rebasing test 024 to make sure it doesn't
break again.

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20230919165804.439110-3-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 19:57:58 +03:00 committed by Kevin Wolf
parent 8b097fd6b0
commit 827171c318
2 changed files with 87 additions and 0 deletions
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57
tests/qemu-iotests/024
View File

@ -199,6 +199,63 @@ echo
# $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
# success, all done
echo "*** done"

30
tests/qemu-iotests/024.out
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@ -171,4 +171,34 @@ read 65536/65536 bytes at offset 196608
Offset Length File
0 0x30000 TEST_DIR/subdir/t.IMGFMT
0x30000 0x10000 TEST_DIR/subdir/t.IMGFMT.base_new
=== Test rebase within one backing chain ===
Creating backing chain
Formatting 'TEST_DIR/subdir/t.IMGFMT.base_new', fmt=IMGFMT size=327680
Formatting 'TEST_DIR/subdir/t.IMGFMT.base_old', fmt=IMGFMT size=262144 backing_file=TEST_DIR/subdir/t.IMGFMT.base_new backing_fmt=IMGFMT
Formatting 'TEST_DIR/subdir/t.IMGFMT', fmt=IMGFMT size=327680 backing_file=TEST_DIR/subdir/t.IMGFMT.base_old backing_fmt=IMGFMT
Fill backing files with data
wrote 327680/327680 bytes at offset 0
320 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 262144/262144 bytes at offset 0
256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Check the last cluster is zeroed in overlay before the rebase
read 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Rebase onto another image in the same chain
Verify that data is read the same before and after rebase
read 262144/262144 bytes at offset 0
256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done