#!/bin/bash
#
# Test concurrent cluster allocations
#
# Copyright (C) 2012 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=kwolf@redhat.com

seq=`basename $0`
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
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

_supported_fmt qcow2
_supported_proto file
_supported_os Linux

CLUSTER_SIZE=64k
size=128M

echo
echo "== creating backing file for COW tests =="

_make_test_img $size

function backing_io()
{
    local offset=$1
    local sectors=$2
    local op=$3
    local pattern=0
    local cur_sec=0

    for i in $(seq 0 $((sectors - 1))); do
        cur_sec=$((offset / 65536 + i))
        pattern=$(( ( (cur_sec % 128) + (cur_sec / 128)) % 128 ))

        echo "$op -P $pattern $((cur_sec * 64))k 64k"
    done
}

backing_io 0 32 write | $QEMU_IO "$TEST_IMG" | _filter_qemu_io

mv "$TEST_IMG" "$TEST_IMG.base"

_make_test_img -b "$TEST_IMG.base" 6G

echo
echo "== Some concurrent requests touching the same cluster =="

function overlay_io()
{
# Allocate middle of cluster 1, then write to somewhere before and after it
cat  <<EOF
break write_aio A
aio_write -P 10 0x18000 0x2000
wait_break A

aio_write -P 11 0x12000 0x2000
aio_write -P 12 0x1c000 0x2000

resume A
aio_flush
EOF

# Sequential write case: Alloc middle of cluster 2, then write overlapping
# to next cluster
cat  <<EOF
break write_aio A
aio_write -P 20 0x28000 0x2000
wait_break A
aio_write -P 21 0x2a000 0x10000
resume A
aio_flush
EOF

# The same with a gap between both requests
cat  <<EOF
break write_aio A
aio_write -P 40 0x48000 0x2000
wait_break A
aio_write -P 41 0x4c000 0x10000
resume A
aio_flush
EOF

# Sequential write, but the next cluster is already allocated
cat  <<EOF
write -P 70 0x76000 0x8000
aio_flush
break write_aio A
aio_write -P 60 0x66000 0x2000
wait_break A
aio_write -P 61 0x6a000 0xe000
resume A
aio_flush
EOF

# Sequential write, but the next cluster is already allocated
# and phyiscally in the right position
cat  <<EOF
write -P 89 0x80000 0x1000
write -P 90 0x96000 0x8000
aio_flush
discard 0x80000 0x10000
aio_flush
break write_aio A
aio_write -P 80 0x86000 0x2000
wait_break A
aio_write -P 81 0x8a000 0xe000
resume A
aio_flush
EOF

# Sequential write, and the next cluster is compressed
cat  <<EOF
write    -P 109 0xa0000 0x1000
write -c -P 110 0xb0000 0x10000
aio_flush
discard 0xa0000 0x10000
aio_flush
break write_aio A
aio_write -P 100 0xa6000 0x2000
wait_break A
aio_write -P 101 0xaa000 0xe000
resume A
aio_flush
EOF

# Reverse sequential write
cat  <<EOF
break write_aio A
aio_write -P 121 0xdc000 0x2000
wait_break A
aio_write -P 120 0xc4000 0x18000
resume A
aio_flush
EOF

# Reverse sequential write with a gap
cat  <<EOF
break write_aio A
aio_write -P 141 0xfc000 0x2000
wait_break A
aio_write -P 140 0xe4000 0x14000
resume A
aio_flush
EOF

# Allocate an area in the middle and then overwrite with a larger request
cat  <<EOF
break write_aio A
aio_write -P 161 0x10c000 0x8000
wait_break A
aio_write -P 160 0x104000 0x18000
resume A
aio_flush
EOF
}

overlay_io | $QEMU_IO blkdebug::"$TEST_IMG" | _filter_qemu_io |\
	sed -e 's/bytes at offset [0-9]*/bytes at offset XXX/g'

echo
echo "== Verify image content =="

function verify_io()
{
    if ($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep "compat: 0.10" > /dev/null); then
        # For v2 images, discarded clusters are read from the backing file
        # Keep the variable empty so that the backing file value can be used as
        # the default below
        discarded=
    else
        # Discarded clusters are zeroed for v3 or later
        discarded=0
    fi

    echo read -P 0 0 0x10000

    echo read -P 1  0x10000 0x2000
    echo read -P 11 0x12000 0x2000
    echo read -P 1  0x14000 0x4000
    echo read -P 10 0x18000 0x2000
    echo read -P 1  0x1a000 0x2000
    echo read -P 12 0x1c000 0x2000
    echo read -P 1  0x1e000 0x2000

    echo read -P 2  0x20000 0x8000
    echo read -P 20 0x28000 0x2000
    echo read -P 21 0x2a000 0x10000
    echo read -P 3  0x3a000 0x6000

    echo read -P 4  0x40000 0x8000
    echo read -P 40 0x48000 0x2000
    echo read -P 4  0x4a000 0x2000
    echo read -P 41 0x4c000 0x10000
    echo read -P 5  0x5c000 0x4000

    echo read -P 6  0x60000 0x6000
    echo read -P 60 0x66000 0x2000
    echo read -P 6  0x68000 0x2000
    echo read -P 61 0x6a000 0xe000
    echo read -P 70 0x78000 0x6000
    echo read -P 7  0x7e000 0x2000

    echo read -P ${discarded:-8} 0x80000 0x6000
    echo read -P 80 0x86000 0x2000
    echo read -P ${discarded:-8} 0x88000 0x2000
    echo read -P 81 0x8a000 0xe000
    echo read -P 90 0x98000 0x6000
    echo read -P 9  0x9e000 0x2000

    echo read -P ${discarded:-10} 0xa0000 0x6000
    echo read -P 100 0xa6000 0x2000
    echo read -P ${discarded:-10} 0xa8000 0x2000
    echo read -P 101 0xaa000 0xe000
    echo read -P 110 0xb8000 0x8000

    echo read -P 12  0xc0000 0x4000
    echo read -P 120 0xc4000 0x18000
    echo read -P 121 0xdc000 0x2000
    echo read -P 13  0xde000 0x2000

    echo read -P 14  0xe0000 0x4000
    echo read -P 140 0xe4000 0x14000
    echo read -P 15  0xf8000 0x4000
    echo read -P 141 0xfc000 0x2000
    echo read -P 15  0xfe000 0x2000

    echo read -P 16  0x100000 0x4000
    echo read -P 160 0x104000 0x8000
    # Undefined content for 0x10c000 0x8000
    echo read -P 160 0x114000 0x8000
    echo read -P 17  0x11c000 0x4000
}

verify_io | $QEMU_IO "$TEST_IMG" | _filter_qemu_io

_check_test_img

# success, all done
echo "*** done"
rm -f $seq.full
status=0