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#!/bin/bash
#
# Copyright (C) 2009 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/>.
#
function do_is_allocated() {
local start=$1
local size=$(( $2 / 512))
local step=$3
local count=$4
for i in `seq 1 $count`; do
echo alloc $(( start + (i - 1) * step )) $size
done
}
function is_allocated() {
do_is_allocated "$@" | $QEMU_IO $TEST_IMG | _filter_qemu_io
}
function do_io() {
local op=$1
local start=$2
local size=$3
local step=$4
local count=$5
local pattern=$6
echo === IO: pattern $pattern >&2
for i in `seq 1 $count`; do
echo $op -P $pattern $(( start + (i - 1) * step )) $size
done
}
function io_pattern() {
do_io "$@" | $QEMU_IO $TEST_IMG | _filter_qemu_io
}
function io() {
local start=$2
local pattern=$(( (start >> 9) % 256 ))
do_io "$@" $pattern | $QEMU_IO $TEST_IMG | _filter_qemu_io
}
function io_zero() {
do_io "$@" 0 | $QEMU_IO $TEST_IMG | _filter_qemu_io
}
function io_test() {
local op=$1
local offset=$2
local cluster_size=$3
local num_large=$4
local num_medium=$((num_large * num_large))
local num_small=$((4 * num_medium))
local half_cluster=$((cluster_size / 2))
local quarter_cluster=$((cluster_size / 4))
local l2_size=$((cluster_size * cluster_size / 8))
# Complete clusters
io "$op" $offset $cluster_size $cluster_size $num_small
offset=$((offset + num_small * $cluster_size))
# From somewhere in the middle to the end of a cluster
io "$op" $((offset + $half_cluster)) $half_cluster $cluster_size $num_small
offset=$((offset + num_small * $cluster_size))
# From the start to somewhere in the middle of a cluster
io "$op" $offset $half_cluster $cluster_size $num_small
offset=$((offset + num_small * $cluster_size))
# Completely misaligned (and small)
io "$op" $((offset + $quarter_cluster)) $half_cluster $cluster_size $num_small
offset=$((offset + num_small * $cluster_size))
# Spanning multiple clusters
io "$op" $((offset + $half_cluster)) $((cluster_size * 2)) $((cluster_size * 3)) $num_medium
offset=$((offset + num_medium * 3 * $cluster_size))
# Spanning multiple L2 tables
# L2 table size: 512 clusters of 4k = 2M
offset=$(( ((offset + l2_size - 1) & ~(l2_size - 1)) - (3 * half_cluster) ))
io "$op" $offset $((6 * half_cluster)) $(( l2_size + half_cluster )) $num_large
offset=$((offset + num_large * ( l2_size + half_cluster )))
}
function io_test2() {
local orig_offset=$1
local cluster_size=$2
local num=$3
# Pattern (repeat after 9 clusters):
# used - used - free - used - compressed - compressed -
# free - free - compressed
# Write the clusters to be compressed
echo === Clusters to be compressed [1]
io_pattern writev $((offset + 4 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
echo === Clusters to be compressed [2]
io_pattern writev $((offset + 5 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
echo === Clusters to be compressed [3]
io_pattern writev $((offset + 8 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
mv $TEST_IMG $TEST_IMG.orig
$QEMU_IMG convert -f $IMGFMT -O $IMGFMT -c $TEST_IMG.orig $TEST_IMG
# Write the used clusters
echo === Used clusters [1]
io_pattern writev $((offset + 0 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
echo === Used clusters [2]
io_pattern writev $((offset + 1 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
echo === Used clusters [3]
io_pattern writev $((offset + 3 * $cluster_size)) $cluster_size $((9 * $cluster_size)) $num 165
# Read them
echo === Read used/compressed clusters
io_pattern readv $((offset + 0 * $cluster_size)) $((2 * $cluster_size)) $((9 * $cluster_size)) $num 165
io_pattern readv $((offset + 3 * $cluster_size)) $((3 * $cluster_size)) $((9 * $cluster_size)) $num 165
io_pattern readv $((offset + 8 * $cluster_size)) $((1 * $cluster_size)) $((9 * $cluster_size)) $num 165
echo === Read zeros
io_zero readv $((offset + 2 * $cluster_size)) $((1 * $cluster_size)) $((9 * $cluster_size)) $num
io_zero readv $((offset + 6 * $cluster_size)) $((2 * $cluster_size)) $((9 * $cluster_size)) $num
}
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