Use blkdebug's new geometry constraints to emulate setups that have needed past regression fixes: write zeroes asserting when running through a loopback block device with max-transfer smaller than cluster size, and discard rounding away portions of requests not aligned to preferred boundaries. Also, add coverage that the block layer is honoring max transfer limits. For now, a single iotest performs all actions, with the idea that we can add future blkdebug constraint test cases in the same file; but it can be split into multiple iotests if we find reason to run one portion of the test in more setups than what are possible in the other. For reference, the final portion of the test (checking whether discard passes as much as possible to the lowest layers of the stack) works as follows: qemu-io: discard 30M at 80000001, passed to blkdebug blkdebug: discard 511 bytes at 80000001, -ENOTSUP (smaller than blkdebug's 512 align) blkdebug: discard 14371328 bytes at 80000512, passed to qcow2 qcow2: discard 739840 bytes at 80000512, -ENOTSUP (smaller than qcow2's 1M align) qcow2: discard 13M bytes at 77M, succeeds blkdebug: discard 15M bytes at 90M, passed to qcow2 qcow2: discard 15M bytes at 90M, succeeds blkdebug: discard 1356800 bytes at 105M, passed to qcow2 qcow2: discard 1M at 105M, succeeds qcow2: discard 308224 bytes at 106M, -ENOTSUP (smaller than qcow2's 1M align) blkdebug: discard 1 byte at 111457280, -ENOTSUP (smaller than blkdebug's 512 align) Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170429191419.30051-10-eblake@redhat.com [mreitz: For cooperation with image locking, add -r to the qemu-io invocation which verifies the image content] Signed-off-by: Max Reitz <mreitz@redhat.com>
115 lines
3.1 KiB
Bash
Executable file
115 lines
3.1 KiB
Bash
Executable file
#!/bin/bash
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#
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# Test corner cases with unusual block geometries
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#
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# Copyright (C) 2016-2017 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=eblake@redhat.com
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seq=`basename $0`
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echo "QA output created by $seq"
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here=`pwd`
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file
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CLUSTER_SIZE=1M
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size=128M
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options=driver=blkdebug,image.driver=qcow2
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echo
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echo "== setting up files =="
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TEST_IMG="$TEST_IMG.base" _make_test_img $size
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$QEMU_IO -c "write -P 11 0 $size" "$TEST_IMG.base" | _filter_qemu_io
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_make_test_img -b "$TEST_IMG.base"
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$QEMU_IO -c "write -P 22 0 $size" "$TEST_IMG" | _filter_qemu_io
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# Limited to 64k max-transfer
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echo
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echo "== constrained alignment and max-transfer =="
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limits=align=4k,max-transfer=64k
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$QEMU_IO -c "open -o $options,$limits blkdebug::$TEST_IMG" \
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-c "write -P 33 1000 128k" -c "read -P 33 1000 128k" | _filter_qemu_io
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echo
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echo "== write zero with constrained max-transfer =="
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limits=align=512,max-transfer=64k,opt-write-zero=$CLUSTER_SIZE
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$QEMU_IO -c "open -o $options,$limits blkdebug::$TEST_IMG" \
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-c "write -z 8003584 2093056" | _filter_qemu_io
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# non-power-of-2 write-zero/discard alignments
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echo
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echo "== non-power-of-2 write zeroes limits =="
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limits=align=512,opt-write-zero=15M,max-write-zero=15M,opt-discard=15M,max-discard=15M
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$QEMU_IO -c "open -o $options,$limits blkdebug::$TEST_IMG" \
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-c "write -z 32M 32M" | _filter_qemu_io
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echo
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echo "== non-power-of-2 discard limits =="
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limits=align=512,opt-write-zero=15M,max-write-zero=15M,opt-discard=15M,max-discard=15M
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$QEMU_IO -c "open -o $options,$limits blkdebug::$TEST_IMG" \
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-c "discard 80000001 30M" | _filter_qemu_io
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echo
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echo "== verify image content =="
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function verify_io()
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{
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if ($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" |
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grep "compat: 0.10" > /dev/null); then
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# For v2 images, discarded clusters are read from the backing file
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discarded=11
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else
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# Discarded clusters are zeroed for v3 or later
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discarded=0
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fi
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echo read -P 22 0 1000
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echo read -P 33 1000 128k
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echo read -P 22 132072 7871512
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echo read -P 0 8003584 2093056
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echo read -P 22 10096640 23457792
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echo read -P 0 32M 32M
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echo read -P 22 64M 13M
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echo read -P $discarded 77M 29M
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echo read -P 22 106M 22M
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}
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verify_io | $QEMU_IO -r "$TEST_IMG" | _filter_qemu_io
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_check_test_img
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# success, all done
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echo "*** done"
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status=0
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