is_zero_cluster() and is_zero_cluster_top_locked() are used only by qcow2_co_write_zeroes(). The former is too broad (we don't care if the sectors we are about to overwrite are non-zero, only that all other sectors in the cluster are zero), so it needs to be called up to twice but with smaller limits - rename it along with adding the neeeded parameter. The latter can be inlined for more compact code. The testsuite change shows that we now have a sparser top file when an unaligned write_zeroes overwrites the only portion of the backing file with data. Based on a patch proposal by Denis V. Lunev. CC: Denis V. Lunev <den@openvz.org> Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
286 lines
15 KiB
Plaintext
286 lines
15 KiB
Plaintext
QA output created by 154
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== backing file contains zeros ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 2048/2048 bytes at offset 0
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 10240
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 17408
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 27648
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 4096, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 8192, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 12288, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 16384, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 20480, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 24576, "length": 8192, "depth": 0, "zero": true, "data": false},
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{ "start": 32768, "length": 134184960, "depth": 1, "zero": true, "data": false}]
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== backing file contains non-zero data before write_zeroes ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 1024/1024 bytes at offset 32768
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 34816
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 32768
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 3072/3072 bytes at offset 33792
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3 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 66560
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 67584
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 66560
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 65536
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 67584
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 32768, "depth": 1, "zero": true, "data": false},
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{ "start": 32768, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 36864, "length": 28672, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 24576},
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{ "start": 69632, "length": 134148096, "depth": 1, "zero": true, "data": false}]
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== backing file contains non-zero data after write_zeroes ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 1024/1024 bytes at offset 34816
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 33792
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 32768
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 34816
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 35840
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 44032
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 41984
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 44032
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 3072/3072 bytes at offset 40960
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3 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 32768, "depth": 1, "zero": true, "data": false},
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{ "start": 32768, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 36864, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 40960, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 24576},
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{ "start": 45056, "length": 134172672, "depth": 1, "zero": true, "data": false}]
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== write_zeroes covers non-zero data ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 1024/1024 bytes at offset 5120
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 5120
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 4096/4096 bytes at offset 4096
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4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 14336
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 13312
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 4096/4096 bytes at offset 12288
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4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 21504
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 21504
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 4096/4096 bytes at offset 20480
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4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 30208
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 29696
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 4096/4096 bytes at offset 28672
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4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 4096, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 8192, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 12288, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 16384, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 20480, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 24576, "length": 4096, "depth": 1, "zero": true, "data": false},
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{ "start": 28672, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 32768, "length": 134184960, "depth": 1, "zero": true, "data": false}]
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== spanning two clusters, non-zero before request ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 1024/1024 bytes at offset 32768
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 35840
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 32768
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 7168/7168 bytes at offset 33792
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 50176
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 52224
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 49152
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 50176
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 6144/6144 bytes at offset 51200
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6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 67584
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 68608
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 65536
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 67584
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 5120/5120 bytes at offset 68608
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5 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 32768, "depth": 1, "zero": true, "data": false},
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{ "start": 32768, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 36864, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 40960, "length": 8192, "depth": 1, "zero": true, "data": false},
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{ "start": 49152, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 24576},
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{ "start": 53248, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 57344, "length": 8192, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 28672},
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{ "start": 69632, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 73728, "length": 134144000, "depth": 1, "zero": true, "data": false}]
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== spanning two clusters, non-zero after request ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 1024/1024 bytes at offset 37888
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 35840
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 5120/5120 bytes at offset 32768
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5 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 37888
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 38912
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 55296
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 52224
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 6144/6144 bytes at offset 49152
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6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 55296
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 56320
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 1024/1024 bytes at offset 72704
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 68608
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 7168/7168 bytes at offset 65536
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 72704
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 32768, "depth": 1, "zero": true, "data": false},
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{ "start": 32768, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 36864, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 40960, "length": 8192, "depth": 1, "zero": true, "data": false},
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{ "start": 49152, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 53248, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 24576},
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{ "start": 57344, "length": 8192, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 69632, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 28672},
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{ "start": 73728, "length": 134144000, "depth": 1, "zero": true, "data": false}]
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== spanning two clusters, partially overwriting backing file ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 4096/4096 bytes at offset 2048
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4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 2048/2048 bytes at offset 3072
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 0
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 2048
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 3072
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 5120
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 6144
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 8192, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 8192, "length": 134209536, "depth": 1, "zero": true, "data": false}]
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== spanning multiple clusters, non-zero in first cluster ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 2048/2048 bytes at offset 65536
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 7168/7168 bytes at offset 67584
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 65536
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 10240/10240 bytes at offset 67584
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10 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 65536, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 69632, "length": 8192, "depth": 0, "zero": true, "data": false},
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{ "start": 77824, "length": 134139904, "depth": 1, "zero": true, "data": false}]
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== spanning multiple clusters, non-zero in intermediate cluster ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 2048/2048 bytes at offset 70656
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 7168/7168 bytes at offset 67584
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 12288/12288 bytes at offset 65536
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12 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 65536, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 12288, "depth": 0, "zero": true, "data": false},
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{ "start": 77824, "length": 134139904, "depth": 1, "zero": true, "data": false}]
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== spanning multiple clusters, non-zero in final cluster ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 2048/2048 bytes at offset 75776
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 7168/7168 bytes at offset 67584
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 10240/10240 bytes at offset 65536
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10 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 75776
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 65536, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 8192, "depth": 0, "zero": true, "data": false},
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{ "start": 73728, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 77824, "length": 134139904, "depth": 1, "zero": true, "data": false}]
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== spanning multiple clusters, partially overwriting backing file ==
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Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file=TEST_DIR/t.IMGFMT.base
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wrote 10240/10240 bytes at offset 66560
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10 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 7168/7168 bytes at offset 67584
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 65536
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 66560
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 7168/7168 bytes at offset 67584
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7 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2048/2048 bytes at offset 74752
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2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 76800
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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[{ "start": 0, "length": 65536, "depth": 1, "zero": true, "data": false},
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{ "start": 65536, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 20480},
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{ "start": 69632, "length": 4096, "depth": 0, "zero": true, "data": false},
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{ "start": 73728, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": 24576},
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{ "start": 77824, "length": 134139904, "depth": 1, "zero": true, "data": false}]
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*** done
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