If the virtual disk size isn't aligned to full clusters, bdrv_co_do_copy_on_readv() may get pnum == 0 before having the full cluster completed, which will let it run into an assertion failure: qemu-io: block/io.c:1203: bdrv_co_do_copy_on_readv: Assertion `skip_bytes < pnum' failed. Check for EOF, assert that we read at least as much as the read request originally wanted to have (which is true at EOF because otherwise bdrv_check_byte_request() would already have returned an error) and return success early even though we couldn't copy the full cluster. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
35 lines
1.5 KiB
Plaintext
35 lines
1.5 KiB
Plaintext
QA output created by 197
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=== Copy-on-read ===
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296
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wrote 1024/1024 bytes at offset 3221225472
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Formatting 'TEST_DIR/t.wrap.IMGFMT', fmt=IMGFMT size=4294967296 backing_file=TEST_DIR/t.IMGFMT backing_fmt=IMGFMT
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wrote 65536/65536 bytes at offset 1048576
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64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 131072/131072 bytes at offset 1048576
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128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 0/0 bytes at offset 0
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0 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 2147483136/2147483136 bytes at offset 1024
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2 GiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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read 1024/1024 bytes at offset 3221226496
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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can't open device TEST_DIR/t.wrap.qcow2: Can't use copy-on-read on read-only device
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2 GiB (0x80010000) bytes allocated at offset 0 bytes (0x0)
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1023.938 MiB (0x3fff0000) bytes not allocated at offset 2 GiB (0x80010000)
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64 KiB (0x10000) bytes allocated at offset 3 GiB (0xc0000000)
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1023.938 MiB (0x3fff0000) bytes not allocated at offset 3 GiB (0xc0010000)
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No errors were found on the image.
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Images are identical.
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=== Partial final cluster ===
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Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1024
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read 1024/1024 bytes at offset 0
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1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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1 KiB (0x400) bytes allocated at offset 0 bytes (0x0)
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No errors were found on the image.
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*** done
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