tests/qemu-iotests/024

   1 #!/usr/bin/env bash
   2 # group: rw backing auto quick
   3 #
   4 # Rebasing COW images
   5 #
   6 # Copyright (C) 2009 Red Hat, Inc.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 # creator
  23 owner=kwolf@redhat.com
  24
  25 seq=`basename $0`
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32     _cleanup_test_img
  33     _rm_test_img "$TEST_DIR/t.$IMGFMT.base_old"
  34     _rm_test_img "$TEST_DIR/t.$IMGFMT.base_new"
  35
  36     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
  37     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_old"
  38     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_new"
  39     rmdir "$TEST_DIR/subdir" 2> /dev/null
  40 }
  41 trap "_cleanup; exit \$status" 0 1 2 3 15
  42
  43 # get standard environment, filters and checks
  44 . ./common.rc
  45 . ./common.filter
  46 . ./common.pattern
  47
  48 # Currently only qcow2 and qed support rebasing
  49 _supported_fmt qcow2 qed
  50 _supported_proto file
  51 _supported_os Linux
  52
  53 CLUSTER_SIZE=65536
  54
  55 # Cluster allocations to be tested:
  56 #
  57 # Backing (old) 11  --  11  --  11  --  11  --
  58 # Backing (new) 22  22  --  --  22  22  --  --
  59 # COW image     33  33  33  33  --  --  --  --
  60 #
  61 # The pattern is written twice to have both an alloc -> non-alloc and a
  62 # non-alloc -> alloc transition in the COW image.
  63
  64 echo "Creating backing file"
  65 echo
  66
  67 TEST_IMG_SAVE="$TEST_IMG"
  68 TEST_IMG="$TEST_IMG.base_old"
  69
  70 _make_test_img 1G
  71 io_pattern writev 0 $CLUSTER_SIZE $((2 * CLUSTER_SIZE)) 8 0x11
  72
  73 TEST_IMG="$TEST_IMG_SAVE.base_new"
  74
  75 echo "Creating new backing file"
  76 echo
  77
  78 _make_test_img 1G
  79 io_pattern writev 0 $((2 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 4 0x22
  80
  81
  82 TEST_IMG="$TEST_IMG_SAVE"
  83
  84 echo "Creating COW image"
  85 echo
  86
  87 _make_test_img -b "$TEST_IMG.base_old" -F $IMGFMT 1G
  88 io_pattern writev 0 $((4 * CLUSTER_SIZE)) 0 1 0x33
  89 io_pattern writev $((8 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 0 1 0x33
  90
  91 echo "Read before the rebase to make sure everything is set up correctly"
  92 echo
  93 io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
  94 io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
  95 io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
  96 io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
  97 io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
  98 io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
  99 io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 100 io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 101 io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 102 io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 103 io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 104 io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 105 io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 106 io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 107 io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 108 io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 109
 110 echo
 111 echo Rebase and test again
 112 echo
 113 $QEMU_IMG rebase -b "$TEST_IMG.base_new" -F $IMGFMT "$TEST_IMG"
 114 io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 115 io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 116 io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 117 io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 118 io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 119 io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 120 io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 121 io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 122 io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 123 io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 124 io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 125 io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
 126 io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 127 io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 128 io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
 129 io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
 130
 131 echo
 132 echo "=== Test rebase in a subdirectory of the working directory ==="
 133 echo
 134
 135 # Clean up the old images beforehand so they do not interfere with
 136 # this test
 137 _cleanup
 138
 139 mkdir "$TEST_DIR/subdir"
 140
 141 # Relative to the overlay
 142 BASE_OLD_OREL="t.$IMGFMT.base_old"
 143 BASE_NEW_OREL="t.$IMGFMT.base_new"
 144
 145 # Relative to $TEST_DIR (which is going to be our working directory)
 146 OVERLAY_WREL="subdir/t.$IMGFMT"
 147
 148 BASE_OLD="$TEST_DIR/subdir/$BASE_OLD_OREL"
 149 BASE_NEW="$TEST_DIR/subdir/$BASE_NEW_OREL"
 150 OVERLAY="$TEST_DIR/$OVERLAY_WREL"
 151
 152 # Test done here:
 153 #
 154 # Backing (old): 11 11 -- 11
 155 # Backing (new): -- 22 22 11
 156 # Overlay:       -- -- -- --
 157 #
 158 # Rebasing works, we have verified that above.  Here, we just want to
 159 # see that rebasing is done for the correct target backing file.
 160
 161 TEST_IMG=$BASE_OLD _make_test_img 1M
 162 TEST_IMG=$BASE_NEW _make_test_img 1M
 163 TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD_OREL" -F $IMGFMT 1M
 164
 165 echo
 166
 167 $QEMU_IO "$BASE_OLD" \
 168     -c "write -P 0x11 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
 169     -c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
 170     | _filter_qemu_io
 171
 172 $QEMU_IO "$BASE_NEW" \
 173     -c "write -P 0x22 $((1 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
 174     -c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
 175     | _filter_qemu_io
 176
 177 echo
 178
 179 pushd "$TEST_DIR" >/dev/null
 180 $QEMU_IMG rebase -f "$IMGFMT" -b "$BASE_NEW_OREL" -F $IMGFMT "$OVERLAY_WREL"
 181 popd >/dev/null
 182
 183 # Verify the backing path is correct
 184 TEST_IMG=$OVERLAY _img_info | grep '^backing file:'
 185
 186 echo
 187
 188 # Verify the data is correct
 189 $QEMU_IO "$OVERLAY" \
 190     -c "read -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
 191     -c "read -P 0x11 $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
 192     -c "read -P 0x00 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
 193     -c "read -P 0x11 $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
 194     | _filter_qemu_io
 195
 196 echo
 197
 198 # Verify that cluster #3 is not allocated (because it is the same in
 199 # $BASE_OLD and $BASE_NEW)
 200 $QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
 201
 202 # Check that rebase within the chain is working when
 203 # overlay_size > old_backing_size
 204 #
 205 # base_new <-- base_old <-- overlay
 206 #
 207 # Backing (new): 11 11 11 11 11
 208 # Backing (old): 22 22 22 22
 209 # Overlay:       -- -- -- -- --
 210 #
 211 # As a result, overlay should contain data identical to base_old, with the
 212 # last cluster remaining unallocated.
 213
 214 echo
 215 echo "=== Test rebase within one backing chain ==="
 216 echo
 217
 218 echo "Creating backing chain"
 219 echo
 220
 221 TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 5 ))
 222 TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
 223     $(( CLUSTER_SIZE * 4 ))
 224 TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD" -F $IMGFMT \
 225     $(( CLUSTER_SIZE * 5 ))
 226
 227 echo
 228 echo "Fill backing files with data"
 229 echo
 230
 231 $QEMU_IO "$BASE_NEW" -c "write -P 0x11 0 $(( CLUSTER_SIZE * 5 ))" \
 232     | _filter_qemu_io
 233 $QEMU_IO "$BASE_OLD" -c "write -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
 234     | _filter_qemu_io
 235
 236 echo
 237 echo "Check the last cluster is zeroed in overlay before the rebase"
 238 echo
 239 $QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
 240     | _filter_qemu_io
 241
 242 echo
 243 echo "Rebase onto another image in the same chain"
 244 echo
 245
 246 $QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
 247
 248 echo "Verify that data is read the same before and after rebase"
 249 echo
 250
 251 # Verify the first 4 clusters are still read the same as in the old base
 252 $QEMU_IO "$OVERLAY" -c "read -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
 253     | _filter_qemu_io
 254 # Verify the last cluster still reads as zeroes
 255 $QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
 256     | _filter_qemu_io
 257
 258 echo
 259
 260 # Check that rebase within the chain is working when
 261 # overlay cluster size > backings cluster size
 262 # (here overlay cluster size == 2 * backings cluster size)
 263 #
 264 # base_new <-- base_old <-- overlay
 265 #
 266 # Backing (new): -- -- -- -- -- --
 267 # Backing (old): -- 11 -- -- 22 --
 268 # Overlay:      |-- --|-- --|-- --|
 269 #
 270 # We should end up having 1st and 3rd cluster allocated, and their halves
 271 # being read as zeroes.
 272
 273 echo
 274 echo "=== Test rebase with different cluster sizes ==="
 275 echo
 276
 277 echo "Creating backing chain"
 278 echo
 279
 280 TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 6 ))
 281 TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
 282     $(( CLUSTER_SIZE * 6 ))
 283 CLUSTER_SIZE=$(( CLUSTER_SIZE * 2 )) TEST_IMG=$OVERLAY \
 284     _make_test_img -b "$BASE_OLD" -F $IMGFMT $(( CLUSTER_SIZE * 6 ))
 285
 286 TEST_IMG=$OVERLAY _img_info
 287
 288 echo
 289 echo "Fill backing files with data"
 290 echo
 291
 292 $QEMU_IO "$BASE_OLD" -c "write -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
 293     -c "write -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
 294     | _filter_qemu_io
 295
 296 echo
 297 echo "Rebase onto another image in the same chain"
 298 echo
 299
 300 $QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
 301
 302 echo "Verify that data is read the same before and after rebase"
 303 echo
 304
 305 $QEMU_IO "$OVERLAY" -c "read -P 0x00 0 $CLUSTER_SIZE" \
 306     -c "read -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
 307     -c "read -P 0x00 $(( CLUSTER_SIZE * 2 )) $(( CLUSTER_SIZE * 2 ))" \
 308     -c "read -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
 309     -c "read -P 0x00 $(( CLUSTER_SIZE * 5 )) $CLUSTER_SIZE" \
 310     | _filter_qemu_io
 311
 312 echo
 313 echo "Verify that untouched cluster remains unallocated"
 314 echo
 315
 316 $QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
 317
 318 echo
 319
 320 # success, all done
 321 echo "*** done"
 322 rm -f $seq.full
 323 status=0