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iotests: Test corruption during COW request 

Extend test file 060 by a test case for corruption occuring concurrently
to a COW request. QEMU should not crash but rather return an appropriate
error message.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Max Reitz 2014-03-10 23:44:09 +01:00 committed by Stefan Hajnoczi
parent 938789ea92
commit 98d39e34fe
2 changed files with 41 additions and 0 deletions
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26
tests/qemu-iotests/060
View File

@ -138,6 +138,32 @@ $QEMU_IMG snapshot -a foo "$TEST_IMG"
_check_test_img
$QEMU_IO -c "$OPEN_RO" -c "read -P 1 0 512" | _filter_qemu_io
echo
echo "=== Testing overlap while COW is in flight ==="
echo
# compat=0.10 is required in order to make the following discard actually
# unallocate the sector rather than make it a zero sector - we want COW, after
# all.
IMGOPTS='compat=0.10' _make_test_img 1G
# Write two clusters, the second one enforces creation of an L2 table after
# the first data cluster.
$QEMU_IO -c 'write 0k 64k' -c 'write 512M 64k' "$TEST_IMG" | _filter_qemu_io
# Discard the first cluster. This cluster will soon enough be reallocated and
# used for COW.
$QEMU_IO -c 'discard 0k 64k' "$TEST_IMG" | _filter_qemu_io
# Now, corrupt the image by marking the second L2 table cluster as free.
poke_file "$TEST_IMG" '131084' "\x00\x00" # 0x2000c
# Start a write operation requiring COW on the image stopping it right before
# doing the read; then, trigger the corruption prevention by writing anything to
# any unallocated cluster, leading to an attempt to overwrite the second L2
# table. Finally, resume the COW write and see it fail (but not crash).
echo "open -o file.driver=blkdebug $TEST_IMG
break cow_read 0
aio_write 0k 1k
wait_break 0
write 64k 64k
resume 0" | $QEMU_IO | _filter_qemu_io
# success, all done
echo "*** done"
rm -f $seq.full

15
tests/qemu-iotests/060.out
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@ -78,4 +78,19 @@ read 512/512 bytes at offset 0
No errors were found on the image.
read 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Testing overlap while COW is in flight ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 536870912
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
discard 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qcow2: Preventing invalid write on metadata (overlaps with active L2 table); image marked as corrupt.
blkdebug: Suspended request '0'
write failed: Input/output error
blkdebug: Resuming request '0'
aio_write failed: No medium found
*** done