7e3dc2ba9a
Using block_resize we can test allocate_first_block() with file descriptor opened with O_DIRECT, ensuring that it works for any size larger than 4096 bytes. Testing smaller sizes is tricky as the result depends on the filesystem used for testing. For example on NFS any size will work since O_DIRECT does not require any alignment. Signed-off-by: Nir Soffer <nsoffer@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20190827010528.8818-3-nsoffer@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
114 lines
3.2 KiB
Bash
Executable file
114 lines
3.2 KiB
Bash
Executable file
#!/usr/bin/env bash
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#
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# Test creating raw image preallocation mode
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#
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# Copyright (C) 2017 Nir Soffer <nirsof@gmail.com>
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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=nirsof@gmail.com
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seq=`basename $0`
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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rm -f "$TEST_DIR/empty"
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# Some file systems sometimes allocate extra blocks independently of
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# the file size. This function hides the resulting difference in the
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# stat -c '%b' output.
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# Parameter 1: Number of blocks an empty file occupies
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# Parameter 2: Minimal number of blocks in an image
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# Parameter 3: Image size in bytes
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_filter_blocks()
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{
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extra_blocks=$1
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min_blocks=$2
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img_size=$3
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sed -e "s/blocks=$min_blocks\\(\$\\|[^0-9]\\)/min allocation/" \
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-e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/max allocation/"
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}
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# Resize image using block_resize.
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# Parameter 1: image path
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# Parameter 2: new size
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_block_resize()
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{
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local path=$1
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local size=$2
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$QEMU -qmp stdio -nographic -nodefaults \
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-blockdev file,node-name=file,filename=$path,cache.direct=on \
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<<EOF
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{'execute': 'qmp_capabilities'}
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{'execute': 'block_resize', 'arguments': {'node-name': 'file', 'size': $size}}
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{'execute': 'quit'}
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EOF
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}
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt raw
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_supported_proto file
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_supported_os Linux
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_default_cache_mode none
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_supported_cache_modes none directsync
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size=$((1 * 1024 * 1024))
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touch "$TEST_DIR/empty"
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extra_blocks=$(stat -c '%b' "$TEST_DIR/empty")
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# We always write the first byte; check how many blocks this filesystem
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# allocates to match empty image alloation.
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printf "\0" > "$TEST_DIR/empty"
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min_blocks=$(stat -c '%b' "$TEST_DIR/empty")
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echo
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echo "== creating image with default preallocation =="
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_make_test_img $size | _filter_imgfmt
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stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
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for mode in off full falloc; do
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echo
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echo "== creating image with preallocation $mode =="
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IMGOPTS=preallocation=$mode _make_test_img $size | _filter_imgfmt
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stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
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done
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for new_size in 4096 1048576; do
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echo
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echo "== resize empty image with block_resize =="
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_make_test_img 0 | _filter_imgfmt
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_block_resize $TEST_IMG $new_size >/dev/null
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stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
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done
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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