iotests: Add test for rebase without input base

#!/usr/bin/env bash

#

# Tests for rebasing COW images that require zero cluster support

#

# Copyright (C) 2019 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

    rm -f "$TEST_IMG.base_new"

}

trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks

. ./common.rc

. ./common.filter

. ./common.pattern

# Currently only qcow2 and qed support rebasing, and only qcow2 v3 has

# zero cluster support

_supported_fmt qcow2

_unsupported_imgopts 'compat=0.10'

_supported_proto file

_supported_os Linux

CLUSTER_SIZE=65536

echo

echo "=== Test rebase without input base ==="

echo

# Cluster allocations to be tested:

#

# Backing (new) 11 -- 11 -- 11 --

# COW image     22 22 11 11 -- --

#

# Expected result:

#

# COW image     22 22 11 11 00 --

#

# (Cluster 2 might be "--" after the rebase, too, but rebase just

#  compares the new backing file to the old one and disregards the

#  overlay.  Therefore, it will never discard overlay clusters.)

_make_test_img $((6 * CLUSTER_SIZE))

TEST_IMG="$TEST_IMG.base_new" _make_test_img $((6 * CLUSTER_SIZE))

echo

$QEMU_IO "$TEST_IMG" \

    -c "write -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    -c "write -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    | _filter_qemu_io

$QEMU_IO "$TEST_IMG.base_new" \

    -c "write -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \

    -c "write -P 0x11 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \

    -c "write -P 0x11 $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE" \

    | _filter_qemu_io

echo

# This should be a no-op

$QEMU_IMG rebase -b "" "$TEST_IMG"

# Verify the data is correct

$QEMU_IO "$TEST_IMG" \

    -c "read -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    -c "read -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    -c "read -P 0x00 $((4 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    | _filter_qemu_io

echo

# Verify the allocation status (first four cluster should be allocated

# in TEST_IMG, clusters 4 and 5 should be unallocated (marked as zero

# clusters here because there is no backing file))

$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

echo

$QEMU_IMG rebase -b "$TEST_IMG.base_new" "$TEST_IMG"

# Verify the data is correct

$QEMU_IO "$TEST_IMG" \

    -c "read -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    -c "read -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    -c "read -P 0x00 $((4 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \

    | _filter_qemu_io

echo

# Verify the allocation status (first four cluster should be allocated

# in TEST_IMG, cluster 4 should be zero, and cluster 5 should be

# unallocated (signified by '"depth": 1'))

$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map

# success, all done

echo "*** done"

rm -f $seq.full

status=0

QA output created by 252

=== Test rebase without input base ===

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=393216

Formatting 'TEST_DIR/t.IMGFMT.base_new', fmt=IMGFMT size=393216

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

wrote 131072/131072 bytes at offset 131072

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

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 131072

64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

wrote 65536/65536 bytes at offset 262144

64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

read 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

read 131072/131072 bytes at offset 131072

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

read 131072/131072 bytes at offset 262144

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

[{ "start": 0, "length": 262144, "depth": 0, "zero": false, "data": true, "offset": OFFSET},

{ "start": 262144, "length": 131072, "depth": 0, "zero": true, "data": false}]

read 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

read 131072/131072 bytes at offset 131072

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

read 131072/131072 bytes at offset 262144

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

[{ "start": 0, "length": 262144, "depth": 0, "zero": false, "data": true, "offset": OFFSET},

{ "start": 262144, "length": 65536, "depth": 0, "zero": true, "data": false},

{ "start": 327680, "length": 65536, "depth": 1, "zero": true, "data": false}]

*** done

247 rw auto quick

248 rw auto quick

249 rw auto quick

252 rw auto backing quick