Commit c35896c5 authored by Kevin Wolf's avatar Kevin Wolf
Browse files

qemu-iotests: Preallocation with external data file 



Test that preallocating metadata results in a somewhat larger qcow2
file, but preallocating data only affects the disk usage of the data
file and the qcow2 file stays small.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 6c3944dc

tests/qemu-iotests/243

+22 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ status=1 # failure is the default! 
_cleanup()

{

    _cleanup_test_img

    rm -f $TEST_IMG.data

}

trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -57,6 +58,27 @@ for mode in off metadata falloc full; do 


done



for mode in off metadata falloc full; do



    echo

    echo "=== External data file: preallocation=$mode ==="

    echo



    IMGOPTS="data_file=$TEST_IMG.data,preallocation=$mode" _make_test_img 64M



    echo -n "qcow2 file size: "

    du -b $TEST_IMG | cut -f1

    echo -n "data file size:  "

    du -b $TEST_IMG.data | cut -f1



    # Can't use precise numbers here because they differ between filesystems

    echo -n "qcow2 disk usage: "

    [ $(du -B1 $TEST_IMG | cut -f1) -lt 1048576 ] && echo "low" || echo "high"

    echo -n "data disk usage:  "

    [ $(du -B1 $TEST_IMG.data | cut -f1) -lt 1048576 ] && echo "low" || echo "high"



done



# success, all done

echo "*** done"

rm -f $seq.full

tests/qemu-iotests/243.out

+32 −0
Original line number Diff line number Diff line
@@ -23,4 +23,36 @@ Disk usage: high 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 preallocation=full

File size: 67436544

Disk usage: high



=== External data file: preallocation=off ===



Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data preallocation=off

qcow2 file size: 196616

data file size:  67108864

qcow2 disk usage: low

data disk usage:  low



=== External data file: preallocation=metadata ===



Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data preallocation=metadata

qcow2 file size: 327680

data file size:  67108864

qcow2 disk usage: low

data disk usage:  low



=== External data file: preallocation=falloc ===



Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data preallocation=falloc

qcow2 file size: 327680

data file size:  67108864

qcow2 disk usage: low

data disk usage:  high



=== External data file: preallocation=full ===



Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data preallocation=full

qcow2 file size: 327680

data file size:  67108864

qcow2 disk usage: low

data disk usage:  high

*** done