diff options
Diffstat (limited to 'tests/qemu-iotests/108')
| -rwxr-xr-x | tests/qemu-iotests/108 | 282 |
1 files changed, 273 insertions, 9 deletions
diff --git a/tests/qemu-iotests/108 b/tests/qemu-iotests/108 index 2355d98c1d..54e935acf2 100755 --- a/tests/qemu-iotests/108 +++ b/tests/qemu-iotests/108 @@ -1,4 +1,5 @@ -#!/bin/bash +#!/usr/bin/env bash +# group: rw auto quick # # Test case for repairing qcow2 images which cannot be repaired using # the on-disk refcount structures @@ -20,30 +21,59 @@ # # creator -owner=mreitz@redhat.com +owner=hreitz@redhat.com seq="$(basename $0)" echo "QA output created by $seq" -here="$PWD" status=1 # failure is the default! _cleanup() { - _cleanup_test_img + _cleanup_test_img + if [ -f "$TEST_DIR/qsd.pid" ]; then + qsd_pid=$(cat "$TEST_DIR/qsd.pid") + kill -KILL "$qsd_pid" + fusermount -u "$TEST_DIR/fuse-export" &>/dev/null + fi + rm -f "$TEST_DIR/fuse-export" } trap "_cleanup; exit \$status" 0 1 2 3 15 # get standard environment, filters and checks . ./common.rc . ./common.filter +. ./common.qemu -# This tests qocw2-specific low-level functionality +# This tests qcow2-specific low-level functionality _supported_fmt qcow2 -_supported_proto file +_supported_proto file fuse _supported_os Linux -# This test directly modifies a refblock so it relies on refcount_bits being 16 -_unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)' +# This test directly modifies a refblock so it relies on refcount_bits being 16; +# and the low-level modification it performs are not tuned for external data +# files +_unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)' data_file + +# This test either needs sudo -n losetup or FUSE exports to work +if sudo -n losetup &>/dev/null; then + loopdev=true +else + loopdev=false + + # Check for usable FUSE in the host environment: + if test ! -c "/dev/fuse"; then + _notrun 'No passwordless sudo nor usable /dev/fuse' + fi + + # QSD --export fuse will either yield "Parameter 'id' is missing" + # or "Invalid parameter 'fuse'", depending on whether there is + # FUSE support or not. + error=$($QSD --export fuse 2>&1) + if [[ $error = *"'fuse'"* ]]; then + _notrun 'Passwordless sudo for losetup or FUSE support required, but' \ + 'neither is available' + fi +fi echo echo '=== Repairing an image without any refcount table ===' @@ -66,7 +96,7 @@ echo echo '=== Repairing unreferenced data cluster in new refblock area ===' echo -IMGOPTS='cluster_size=512' _make_test_img 64M +_make_test_img -o 'cluster_size=512' 64M # Allocate the first 128 kB in the image (first refblock) $QEMU_IO -c 'write 0 0x1b200' "$TEST_IMG" | _filter_qemu_io # should be 131072 == 0x20000 @@ -136,6 +166,240 @@ _make_test_img 64M poke_file "$TEST_IMG" $((0x10008)) "\xff\xff\xff\xff\xff\xff\x00\x00" _check_test_img -r all +echo +echo '=== Check rebuilt reftable location ===' + +# In an earlier version of the refcount rebuild algorithm, the +# reftable was generally placed at the image end (unless something was +# allocated in the area covered by the refblock right before the image +# file end, then we would try to place the reftable in that refblock). +# This was later changed so the reftable would be placed in the +# earliest possible location. Test this. + +echo +echo '--- Does the image size increase? ---' +echo + +# First test: Just create some image, write some data to it, and +# resize it so there is free space at the end of the image (enough +# that it spans at least one full refblock, which for cluster_size=512 +# images, spans 128k). With the old algorithm, the reftable would +# have then been placed at the end of the image file, but with the new +# one, it will be put in that free space. +# We want to check whether the size of the image file increases due to +# rebuilding the refcount structures (it should not). + +_make_test_img -o 'cluster_size=512' 1M +# Write something +$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io + +# Add free space +file_len=$(stat -c '%s' "$TEST_IMG") +truncate -s $((file_len + 256 * 1024)) "$TEST_IMG" + +# Corrupt the image by saying the image header was not allocated +rt_offset=$(peek_file_be "$TEST_IMG" 48 8) +rb_offset=$(peek_file_be "$TEST_IMG" $rt_offset 8) +poke_file "$TEST_IMG" $rb_offset "\x00\x00" + +# Check whether rebuilding the refcount structures increases the image +# file size +file_len=$(stat -c '%s' "$TEST_IMG") +echo +# The only leaks there can be are the old refcount structures that are +# leaked during rebuilding, no need to clutter the output with them +_check_test_img -r all | grep -v '^Repairing cluster.*refcount=1 reference=0' +echo +post_repair_file_len=$(stat -c '%s' "$TEST_IMG") + +if [[ $file_len -eq $post_repair_file_len ]]; then + echo 'OK: Image size did not change' +else + echo 'ERROR: Image size differs' \ + "($file_len before, $post_repair_file_len after)" +fi + +echo +echo '--- Will the reftable occupy a hole specifically left for it? ---' +echo + +# Note: With cluster_size=512, every refblock covers 128k. +# The reftable covers 8M per reftable cluster. + +# Create an image that requires two reftable clusters (just because +# this is more interesting than a single-clustered reftable). +_make_test_img -o 'cluster_size=512' 9M +$QEMU_IO -c 'write 0 8M' "$TEST_IMG" | _filter_qemu_io + +# Writing 8M will have resized the reftable. Unfortunately, doing so +# will leave holes in the file, so we need to fill them up so we can +# be sure the whole file is allocated. Do that by writing +# consecutively smaller chunks starting from 8 MB, until the file +# length increases even with a chunk size of 512. Then we must have +# filled all holes. +ofs=$((8 * 1024 * 1024)) +block_len=$((16 * 1024)) +while [[ $block_len -ge 512 ]]; do + file_len=$(stat -c '%s' "$TEST_IMG") + while [[ $(stat -c '%s' "$TEST_IMG") -eq $file_len ]]; do + # Do not include this in the reference output, it does not + # really matter which qemu-io calls we do here exactly + $QEMU_IO -c "write $ofs $block_len" "$TEST_IMG" >/dev/null + ofs=$((ofs + block_len)) + done + block_len=$((block_len / 2)) +done + +# Fill up to 9M (do not include this in the reference output either, +# $ofs is random for all we know) +$QEMU_IO -c "write $ofs $((9 * 1024 * 1024 - ofs))" "$TEST_IMG" >/dev/null + +# Make space as follows: +# - For the first refblock: Right at the beginning of the image (this +# refblock is placed in the first place possible), +# - For the reftable somewhere soon afterwards, still near the +# beginning of the image (i.e. covered by the first refblock); the +# reftable too is placed in the first place possible, but only after +# all refblocks have been placed) +# No space is needed for the other refblocks, because no refblock is +# put before the space it covers. In this test case, we do not mind +# if they are placed at the image file's end. + +# Before we make that space, we have to find out the host offset of +# the area that belonged to the two data clusters at guest offset 4k, +# because we expect the reftable to be placed there, and we will have +# to verify that it is. + +l1_offset=$(peek_file_be "$TEST_IMG" 40 8) +l2_offset=$(peek_file_be "$TEST_IMG" $l1_offset 8) +l2_offset=$((l2_offset & 0x00fffffffffffe00)) +data_4k_offset=$(peek_file_be "$TEST_IMG" \ + $((l2_offset + 4096 / 512 * 8)) 8) +data_4k_offset=$((data_4k_offset & 0x00fffffffffffe00)) + +$QEMU_IO -c "discard 0 512" -c "discard 4k 1k" "$TEST_IMG" | _filter_qemu_io + +# Corrupt the image by saying the image header was not allocated +rt_offset=$(peek_file_be "$TEST_IMG" 48 8) +rb_offset=$(peek_file_be "$TEST_IMG" $rt_offset 8) +poke_file "$TEST_IMG" $rb_offset "\x00\x00" + +echo +# The only leaks there can be are the old refcount structures that are +# leaked during rebuilding, no need to clutter the output with them +_check_test_img -r all | grep -v '^Repairing cluster.*refcount=1 reference=0' +echo + +# Check whether the reftable was put where we expected +rt_offset=$(peek_file_be "$TEST_IMG" 48 8) +if [[ $rt_offset -eq $data_4k_offset ]]; then + echo 'OK: Reftable is where we expect it' +else + echo "ERROR: Reftable is at $rt_offset, but was expected at $data_4k_offset" +fi + +echo +echo '--- Rebuilding refcount structures on block devices ---' +echo + +# A block device cannot really grow, at least not during qemu-img +# check. As mentioned in the above cases, rebuilding the refcount +# structure may lead to new refcount structures being written after +# the end of the image, and in the past that happened even if there +# was more than sufficient space in the image. Such post-EOF writes +# will not work on block devices, so test that the new algorithm +# avoids it. + +# If we have passwordless sudo and losetup, we can use those to create +# a block device. Otherwise, we can resort to qemu's FUSE export to +# create a file that isn't growable, which effectively tests the same +# thing. + +_cleanup_test_img +truncate -s $((64 * 1024 * 1024)) "$TEST_IMG" + +if $loopdev; then + export_mp=$(sudo -n losetup --show -f "$TEST_IMG") + export_mp_driver=host_device + sudo -n chmod go+rw "$export_mp" +else + # Create non-growable FUSE export that is a bit like an empty + # block device + export_mp="$TEST_DIR/fuse-export" + export_mp_driver=file + touch "$export_mp" + + $QSD \ + --blockdev file,node-name=export-node,filename="$TEST_IMG" \ + --export fuse,id=fuse-export,node-name=export-node,mountpoint="$export_mp",writable=on,growable=off,allow-other=off \ + --pidfile "$TEST_DIR/qsd.pid" \ + --daemonize +fi + +# Now create a qcow2 image on the device -- unfortunately, qemu-img +# create force-creates the file, so we have to resort to the +# blockdev-create job. +_launch_qemu \ + --blockdev $export_mp_driver,node-name=file,filename="$export_mp" + +_send_qemu_cmd \ + $QEMU_HANDLE \ + '{ "execute": "qmp_capabilities" }' \ + 'return' + +# Small cluster size again, so the image needs multiple refblocks +_send_qemu_cmd \ + $QEMU_HANDLE \ + '{ "execute": "blockdev-create", + "arguments": { + "job-id": "create", + "options": { + "driver": "qcow2", + "file": "file", + "size": '$((64 * 1024 * 1024))', + "cluster-size": 512 + } } }' \ + '"concluded"' + +_send_qemu_cmd \ + $QEMU_HANDLE \ + '{ "execute": "job-dismiss", "arguments": { "id": "create" } }' \ + 'return' + +_send_qemu_cmd \ + $QEMU_HANDLE \ + '{ "execute": "quit" }' \ + 'return' + +wait=y _cleanup_qemu +echo + +# Write some data +$QEMU_IO -c 'write 0 64k' "$export_mp" | _filter_qemu_io + +# Corrupt the image by saying the image header was not allocated +rt_offset=$(peek_file_be "$export_mp" 48 8) +rb_offset=$(peek_file_be "$export_mp" $rt_offset 8) +poke_file "$export_mp" $rb_offset "\x00\x00" + +# Repairing such a simple case should just work +# (We used to put the reftable at the end of the image file, which can +# never work for non-growable devices.) +echo +TEST_IMG="$export_mp" _check_test_img -r all \ + | grep -v '^Repairing cluster.*refcount=1 reference=0' + +if $loopdev; then + sudo -n losetup -d "$export_mp" +else + qsd_pid=$(cat "$TEST_DIR/qsd.pid") + kill -TERM "$qsd_pid" + # Wait for process to exit (cannot `wait` because the QSD is daemonized) + while [ -f "$TEST_DIR/qsd.pid" ]; do + true + done +fi + # success, all done echo '*** done' rm -f $seq.full |