f2d86ade4d
125 should not use qemu-img to get the on-disk image size, because that reports it in a human-readable format that is useless to us. Just use stat instead (like we do to get the image file length). Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190925183231.11196-4-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
171 lines
5.8 KiB
Bash
Executable File
171 lines
5.8 KiB
Bash
Executable File
#!/usr/bin/env bash
|
|
#
|
|
# Test preallocated growth of qcow2 images
|
|
#
|
|
# Copyright (C) 2017 Red Hat, Inc.
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
#
|
|
|
|
# creator
|
|
owner=mreitz@redhat.com
|
|
|
|
seq=$(basename $0)
|
|
echo "QA output created by $seq"
|
|
|
|
status=1 # failure is the default!
|
|
|
|
_cleanup()
|
|
{
|
|
_cleanup_test_img
|
|
}
|
|
trap "_cleanup; exit \$status" 0 1 2 3 15
|
|
|
|
get_image_size_on_host()
|
|
{
|
|
echo $(($(stat -c '%b * %B' "$TEST_IMG_FILE")))
|
|
}
|
|
|
|
# get standard environment and filters
|
|
. ./common.rc
|
|
. ./common.filter
|
|
|
|
_supported_fmt qcow2
|
|
_supported_proto file
|
|
|
|
if [ -z "$TEST_IMG_FILE" ]; then
|
|
TEST_IMG_FILE=$TEST_IMG
|
|
fi
|
|
|
|
# Test whether we are running on a broken XFS version. There is this
|
|
# bug:
|
|
|
|
# $ rm -f foo
|
|
# $ touch foo
|
|
# $ block_size=4096 # Your FS's block size
|
|
# $ fallocate -o $((block_size / 2)) -l $block_size foo
|
|
# $ LANG=C xfs_bmap foo | grep hole
|
|
# 1: [8..15]: hole
|
|
#
|
|
# The problem is that the XFS driver rounds down the offset and
|
|
# rounds up the length to the block size, but independently. As
|
|
# such, it only allocates the first block in the example above,
|
|
# even though it should allocate the first two blocks (because our
|
|
# request is to fallocate something that touches both the first
|
|
# two blocks).
|
|
#
|
|
# This means that when you then write to the beginning of the
|
|
# second block, the disk usage of the first two blocks grows.
|
|
#
|
|
# That is precisely what fallocate() promises, though: That when you
|
|
# write to an area that you have fallocated, no new blocks will have
|
|
# to be allocated.
|
|
|
|
touch "$TEST_IMG_FILE"
|
|
# Assuming there is no FS with a block size greater than 64k
|
|
fallocate -o 65535 -l 2 "$TEST_IMG_FILE"
|
|
len0=$(get_image_size_on_host)
|
|
|
|
# Write to something that in theory we have just fallocated
|
|
# (Thus, the on-disk size should not increase)
|
|
poke_file "$TEST_IMG_FILE" 65536 42
|
|
len1=$(get_image_size_on_host)
|
|
|
|
if [ $len1 -gt $len0 ]; then
|
|
_notrun "the test filesystem's fallocate() is broken"
|
|
fi
|
|
|
|
rm -f "$TEST_IMG_FILE"
|
|
|
|
# Generally, we create some image with or without existing preallocation and
|
|
# then resize it. Then we write some data into the image and verify that its
|
|
# size does not change if we have used preallocation.
|
|
|
|
# With a cluster size of 512 B, one L2 table covers 64 * 512 B = 32 kB.
|
|
# One cluster of the L1 table covers 64 * 32 kB = 2 MB.
|
|
# There are multiple cases we want to test:
|
|
# (1) Grow an image without having to allocate a new L2 table.
|
|
# (2) Grow an image, having to allocate a new L2 table.
|
|
# (3) Grow an image, having to grow the L1 table.
|
|
# Therefore, we create an image that is 48 kB below 2 MB. Then:
|
|
# (1) We resize it to 2 MB - 32 kB. (+ 16 kB)
|
|
# (2) We resize it to 2 MB. (+ 48 kB)
|
|
# (3) We resize it to 2 MB + 32 kB. (+ 80 kB)
|
|
|
|
# in B
|
|
CREATION_SIZE=$((2 * 1024 * 1024 - 48 * 1024))
|
|
|
|
# 512 is the actual test -- but it's good to test 64k as well, just to be sure.
|
|
for cluster_size in 512 64k; do
|
|
# in kB
|
|
for GROWTH_SIZE in 16 48 80; do
|
|
for create_mode in off metadata falloc full; do
|
|
for growth_mode in off metadata falloc full; do
|
|
echo "--- cluster_size=$cluster_size growth_size=$GROWTH_SIZE create_mode=$create_mode growth_mode=$growth_mode ---"
|
|
|
|
IMGOPTS="preallocation=$create_mode,cluster_size=$cluster_size" _make_test_img ${CREATION_SIZE}
|
|
$QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K
|
|
|
|
host_size_0=$(get_image_size_on_host)
|
|
file_length_0=$(stat -c '%s' "$TEST_IMG_FILE")
|
|
|
|
$QEMU_IO -c "write 0 $CREATION_SIZE" "$TEST_IMG" | _filter_qemu_io
|
|
|
|
host_size_1=$(get_image_size_on_host)
|
|
file_length_1=$(stat -c '%s' "$TEST_IMG_FILE")
|
|
|
|
$QEMU_IO -c "write $CREATION_SIZE ${GROWTH_SIZE}K" "$TEST_IMG" | _filter_qemu_io
|
|
|
|
host_size_2=$(get_image_size_on_host)
|
|
file_length_2=$(stat -c '%s' "$TEST_IMG_FILE")
|
|
|
|
# Test creation preallocation: Compare #0 against #1
|
|
if [ $create_mode != off ]; then
|
|
# The image length should not have grown
|
|
if [ $file_length_1 -gt $file_length_0 ]; then
|
|
echo "ERROR (create): Image length has grown from $file_length_0 to $file_length_1"
|
|
fi
|
|
if [ $create_mode != metadata ]; then
|
|
# The host size should not have grown either
|
|
if [ $host_size_1 -gt $host_size_0 ]; then
|
|
echo "ERROR (create): Host size has grown from $host_size_0 to $host_size_1"
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
# Test resize preallocation: Compare #2 against #1
|
|
if [ $growth_mode != off ]; then
|
|
# The image length should not have grown
|
|
if [ $file_length_2 -gt $file_length_1 ]; then
|
|
echo "ERROR (grow): Image length has grown from $file_length_1 to $file_length_2"
|
|
fi
|
|
if [ $growth_mode != metadata ]; then
|
|
# The host size should not have grown either
|
|
if [ $host_size_2 -gt $host_size_1 ]; then
|
|
echo "ERROR (grow): Host size has grown from $host_size_1 to $host_size_2"
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
echo
|
|
done
|
|
done
|
|
done
|
|
done
|
|
|
|
# success, all done
|
|
echo '*** done'
|
|
rm -f $seq.full
|
|
status=0
|