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iotests: Test allocate_first_block() with O_DIRECT

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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>
This commit is contained in:
Nir Soffer 2019-08-27 04:05:28 +03:00 committed by Max Reitz
parent 3a20013fbb
commit 7e3dc2ba9a
2 changed files with 36 additions and 0 deletions
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28
tests/qemu-iotests/175
View File

@ -49,6 +49,23 @@ _filter_blocks()
-e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/max allocation/"
}
# Resize image using block_resize.
# Parameter 1: image path
# Parameter 2: new size
_block_resize()
{
local path=$1
local size=$2
$QEMU -qmp stdio -nographic -nodefaults \
-blockdev file,node-name=file,filename=$path,cache.direct=on \
<<EOF
{'execute': 'qmp_capabilities'}
{'execute': 'block_resize', 'arguments': {'node-name': 'file', 'size': $size}}
{'execute': 'quit'}
EOF
}
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
@ -57,6 +74,9 @@ _supported_fmt raw
_supported_proto file
_supported_os Linux
_default_cache_mode none
_supported_cache_modes none directsync
size=$((1 * 1024 * 1024))
touch "$TEST_DIR/empty"
@ -79,6 +99,14 @@ for mode in off full falloc; do
stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
done
for new_size in 4096 1048576; do
echo
echo "== resize empty image with block_resize =="
_make_test_img 0 | _filter_imgfmt
_block_resize $TEST_IMG $new_size >/dev/null
stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
done
# success, all done
echo "*** done"
rm -f $seq.full

8
tests/qemu-iotests/175.out
View File

@ -15,4 +15,12 @@ size=1048576, max allocation
== creating image with preallocation falloc ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=falloc
size=1048576, max allocation
== resize empty image with block_resize ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0
size=4096, min allocation
== resize empty image with block_resize ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0
size=1048576, min allocation
*** done