common.pattern

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2009 Red Hat, Inc.
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  18 # USA
  19 #
  20
  21 function do_io() {
  22     local op=$1
  23     local start=$2
  24     local size=$3
  25     local step=$4
  26     local count=$5
  27     local pattern=$6
  28
  29     echo === IO: pattern $pattern >&2
  30     for i in `seq 1 $count`; do
  31         echo $op -P $pattern $(( start + i * step )) $size
  32     done
  33 }
  34
  35 function io_pattern() {
  36     do_io $@ | $QEMU_IO $TEST_IMG | _filter_qemu_io
  37 }
  38
  39 function io() {
  40     local start=$2
  41     local pattern=$(( (start >> 9) % 256 ))
  42
  43     do_io $@ $pattern | $QEMU_IO $TEST_IMG | _filter_qemu_io
  44 }
  45
  46 function io_zero() {
  47     do_io $@ 0 | $QEMU_IO $TEST_IMG | _filter_qemu_io
  48 }
  49
  50 function io_test() {
  51     local op=$1
  52     local offset=$2
  53
  54     # Complete clusters (size = 4k)
  55     io $op $offset 4096 4096 256
  56     offset=$((offset + 256 * 4096))
  57
  58     # From somewhere in the middle to the end of a cluster
  59     io $op $((offset + 2048)) 2048 4096 256
  60     offset=$((offset + 256 * 4096))
  61
  62     # From the start to somewhere in the middle of a cluster
  63     io $op $offset 2048 4096 256
  64     offset=$((offset + 256 * 4096))
  65
  66     # Completely misaligned (and small)
  67     io $op $((offset + 1024)) 2048 4096 256
  68     offset=$((offset + 256 * 4096))
  69
  70     # Spanning multiple clusters
  71     io $op $((offset + 2048)) 8192 12288 64
  72     offset=$((offset + 64 * 12288))
  73
  74     # Spanning multiple L2 tables
  75     # L2 table size: 512 clusters of 4k = 2M
  76     io $op $((offset + 2048)) 4194304 4999680 8
  77     offset=$((offset + 8 * 4999680))
  78
  79     if false; then
  80         true
  81     fi
  82 }
  83
  84 function io_test2() {
  85     local orig_offset=$1
  86
  87     # Pattern (repeat after 9 clusters):
  88     # used - used - free - used - compressed - compressed - free - free - compressed
  89
  90     # Write the clusters to be compressed
  91     echo === Clusters to be compressed [1]
  92     io_pattern writev $((offset + 4 * 4096)) 4096 $((9 * 4096)) 256 165
  93     echo === Clusters to be compressed [2]
  94     io_pattern writev $((offset + 5 * 4096)) 4096 $((9 * 4096)) 256 165
  95     echo === Clusters to be compressed [3]
  96     io_pattern writev $((offset + 8 * 4096)) 4096 $((9 * 4096)) 256 165
  97
  98     mv $TEST_IMG $TEST_IMG.orig
  99     $QEMU_IMG convert -f qcow2 -O qcow2 -c $TEST_IMG.orig $TEST_IMG
 100
 101     # Write the used clusters
 102     echo === Used clusters [1]
 103     io_pattern writev $((offset + 0 * 4096)) 4096 $((9 * 4096)) 256 165
 104     echo === Used clusters [2]
 105     io_pattern writev $((offset + 1 * 4096)) 4096 $((9 * 4096)) 256 165
 106     echo === Used clusters [3]
 107     io_pattern writev $((offset + 3 * 4096)) 4096 $((9 * 4096)) 256 165
 108
 109     # Read them
 110     echo === Read used/compressed clusters
 111     io_pattern readv $((offset + 0 * 4096)) $((2 * 4096)) $((9 * 4096)) 256 165
 112     io_pattern readv $((offset + 3 * 4096)) $((3 * 4096)) $((9 * 4096)) 256 165
 113     io_pattern readv $((offset + 8 * 4096)) $((1 * 4096)) $((9 * 4096)) 256 165
 114
 115     echo === Read zeros
 116     io_zero readv $((offset + 2 * 4096)) $((1 * 4096)) $((9 * 4096)) 256
 117     io_zero readv $((offset + 6 * 4096)) $((2 * 4096)) $((9 * 4096)) 256
 118 }