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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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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