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|
#!/usr/bin/env bash
#
# Test case for preallocated zero clusters in qcow2
#
# Copyright (C) 2013 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# creator
owner=mreitz@redhat.com
seq="$(basename $0)"
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
# This tests qcow2-specific low-level functionality
_supported_fmt qcow2
_supported_proto generic
# We need zero clusters and snapshots
# (TODO: Consider splitting the snapshot part into a separate test
# file, so this one runs with refcount_bits=1 and data_file)
_unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]' data_file
# Intentionally create an unaligned image
IMG_SIZE=$((64 * 1024 * 1024 + 512))
echo
echo "=== Testing cluster discards ==="
echo
_make_test_img $IMG_SIZE
# Write some normal clusters, zero some of them (creating preallocated
# zero clusters) and discard everything. Everything should now read as 0.
$QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
-c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
| _filter_qemu_io
# Check the image (there shouldn't be any leaks)
_check_test_img
# Map the image (we want all clusters to be gone)
$QEMU_IMG map "$TEST_IMG"
_cleanup_test_img
echo
echo '=== Writing to preallocated zero clusters ==='
echo
_make_test_img $IMG_SIZE
# Create data clusters (not aligned to an L2 table)
$QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
# Convert the data clusters to preallocated zero clusters
$QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
# Now write to them (with a COW needed for the head and tail)
$QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
| _filter_qemu_io
# Check metadata correctness
_check_test_img
# Check data correctness
$QEMU_IO -c "read -P 0 $(( 1024 * 1024)) 32k" \
-c "read -P 23 $(((1024 + 32) * 1024)) 192k" \
-c "read -P 0 $(((1024 + 32 + 192) * 1024)) 32k" \
"$TEST_IMG" \
| _filter_qemu_io
# Check that we have actually reused the original area
new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
if [ "$new_map" = "$orig_map" ]; then
echo 'Successfully reused original clusters.'
else
echo 'Failed to reuse original clusters.'
echo 'Original map:'
echo "$orig_map"
echo 'New map:'
echo "$new_map"
fi
_cleanup_test_img
echo
echo '=== Writing to a snapshotted preallocated zero cluster ==='
echo
_make_test_img 64k
# Create a preallocated zero cluster
$QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
| _filter_qemu_io
# Snapshot it
$QEMU_IMG snapshot -c foo "$TEST_IMG"
# Write to the cluster
$QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
# Check metadata correctness
_check_test_img
# Check data correctness
$QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
$QEMU_IMG snapshot -a foo "$TEST_IMG"
$QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
_cleanup_test_img
echo
echo '=== Consecutive write to a preallocated zero cluster ==='
echo
_make_test_img 192k
# Create three normal clusters
$QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
# Make the middle cluster a preallocated zero cluster
$QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
# Try to overwrite everything: This should reuse the whole range. To test that
# this only issues a single continuous write request, use blkdebug.
$QEMU_IO -c 'write -P 42 0 192k' \
"json:{
'driver': '$IMGFMT',
'file': {
'driver': 'blkdebug',
'image.filename': '$TEST_IMG',
'set-state': [{
'event': 'write_aio',
'new_state': 2
}],
'inject-error': [{
'event': 'write_aio',
'state': 2
}]
}
}" \
| _filter_qemu_io
# Check metadata correctness
_check_test_img
# Check that we have actually reused the original area
new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
if [ "$new_map" = "$orig_map" ]; then
echo 'Successfully reused original clusters.'
else
echo 'Failed to reuse original clusters.'
echo 'Original map:'
echo "$orig_map"
echo 'New map:'
echo "$new_map"
fi
_cleanup_test_img
# success, all done
echo "*** done"
rm -f $seq.full
status=0
|
