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FRET-qemu/tests/qemu-iotests/142
Kevin Wolf 5dbd0ce115 file-posix: Fix alignment after reopen changing O_DIRECT 
At the end of a reopen, we already call bdrv_refresh_limits(), which
should update bs->request_alignment according to the new file
descriptor. However, raw_probe_alignment() relies on s->needs_alignment
and just uses 1 if it isn't set. We neglected to update this field, so
starting with cache=writeback and then reopening with cache=none means
that we get an incorrect bs->request_alignment == 1 and unaligned
requests fail instead of being automatically aligned.

Fix this by recalculating s->needs_alignment in raw_refresh_limits()
before calling raw_probe_alignment().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20211104113109.56336-1-kwolf@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20211115145409.176785-13-kwolf@redhat.com>
[hreitz: Fix iotest 142 for block sizes greater than 512 by operating on
         a file with a size of 1 MB]
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20211116101431.105252-1-hreitz@redhat.com>
2021-11-16 11:30:29 +01:00

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#!/usr/bin/env bash
#
# Test for configuring cache modes of arbitrary nodes (requires O_DIRECT)
#
# Copyright (C) 2015 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=kwolf@redhat.com
seq=`basename $0`
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
_rm_test_img "$TEST_IMG.snap"
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
_supported_fmt qcow2
_supported_proto file
# We test all cache modes anyway, but O_DIRECT needs to be supported
_default_cache_mode none
_supported_cache_modes none directsync
do_run_qemu()
{
echo Testing: "$@"
(
if ! test -t 0; then
while read cmd; do
echo $cmd
done
fi
echo quit
) | $QEMU -nographic -monitor stdio -nodefaults "$@"
echo
}
run_qemu()
{
do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qemu | _filter_hmp
}
size=128M
TEST_IMG="$TEST_IMG.base" _make_test_img $size
TEST_IMG="$TEST_IMG.snap" _make_test_img $size
_make_test_img -b "$TEST_IMG.base" $size -F $IMGFMT
echo
echo === Simple test for all cache modes ===
echo
run_qemu -drive file="$TEST_IMG",cache=none
run_qemu -drive file="$TEST_IMG",cache=directsync
run_qemu -drive file="$TEST_IMG",cache=writeback
run_qemu -drive file="$TEST_IMG",cache=writethrough
run_qemu -drive file="$TEST_IMG",cache=unsafe
run_qemu -drive file="$TEST_IMG",cache=invalid_value
echo
echo === Check inheritance of cache modes ===
echo
files="if=none,file=$TEST_IMG,backing.file.filename=$TEST_IMG.base"
ids="node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file"
check_cache_all()
{
# cache.direct is supposed to be inherited by both bs->file and
# bs->backing
printf "cache.direct=on on none0\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",cache.direct=on | grep -e "Cache" -e "[Cc]annot|[Cc]ould not|[Cc]an't"
printf "\ncache.direct=on on file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",file.cache.direct=on | grep -e "Cache" -e "[Cc]annot|[Cc]ould not|[Cc]an't"
printf "\ncache.direct=on on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.cache.direct=on | grep -e "Cache" -e "[Cc]annot|[Cc]ould not|[Cc]an't"
printf "\ncache.direct=on on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.file.cache.direct=on | grep -e "Cache" -e "[Cc]annot|[Cc]ould not|[Cc]an't"
# cache.writeback is supposed to be inherited by bs->backing; bs->file
# always gets cache.writeback=on
printf "\n\ncache.writeback=off on none0\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",cache.writeback=off | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.writeback=off on file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",file.cache.writeback=off | grep -e "doesn't" -e "does not"
printf "\ncache.writeback=off on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.cache.writeback=off | grep -e "doesn't" -e "does not"
printf "\ncache.writeback=off on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.file.cache.writeback=off | grep -e "doesn't" -e "does not"
# cache.no-flush is supposed to be inherited by both bs->file and bs->backing
printf "\n\ncache.no-flush=on on none0\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",cache.no-flush=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",file.cache.no-flush=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.cache.no-flush=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids",backing.file.cache.no-flush=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
}
echo
echo "--- Configure cache modes on the command line ---"
echo
# First check the inherited cache mode after opening the image.
hmp_cmds="info block none0
info block image
info block file
info block backing
info block backing-file"
check_cache_all
echo
echo "--- Cache modes after reopen (live snapshot) ---"
echo
# Then trigger a reopen and check that the cache modes are still the same.
hmp_cmds="snapshot_blkdev -n none0 $TEST_IMG.snap $IMGFMT
info block
info block image
info block file
info block backing
info block backing-file"
check_cache_all
echo
echo "--- Change cache modes with reopen (qemu-io command, flags) ---"
echo
# This one actually changes the cache mode with the reopen. For this test, the
# new cache mode is specified in the flags, not as an option.
hmp_cmds='qemu-io none0 "reopen -c none"
info block none0
info block image
info block file
info block backing
info block backing-file'
check_cache_all
echo
echo "--- Change cache modes with reopen (qemu-io command, options) ---"
echo
# This one actually changes the cache mode with the reopen. For this test, the
# new cache mode is specified as an option, not in the flags.
hmp_cmds='qemu-io none0 "reopen -o cache.direct=on"
info block none0
info block image
info block file
info block backing
info block backing-file'
check_cache_all
echo
echo "--- Change cache modes after snapshot ---"
echo
# This checks that the original image doesn't inherit from the snapshot
hmp_cmds="snapshot_blkdev -n none0 $TEST_IMG.snap $IMGFMT
qemu-io none0 \"reopen -c none\"
info block none0
info block image
info block file
info block backing
info block backing-file"
check_cache_all
echo
echo "--- Change cache mode in parent, child has explicit option in JSON ---"
echo
# This checks that children with options explicitly set by the json:
# pseudo-protocol don't inherit these options from their parents.
#
# Yes, blkdebug::json:... is criminal, but I can't see another way to have a
# BDS initialised with the json: pseudo-protocol, but still have it inherit
# options from its parent node.
hmp_cmds="qemu-io none0 \"reopen -o cache.direct=on,cache.no-flush=on\"
info block none0
info block image
info block blkdebug
info block file"
echo "$hmp_cmds" | run_qemu -drive if=none,file="blkdebug::json:{\"filename\":\"$TEST_IMG\",,\"cache\":{\"direct\":false}}",node-name=image,file.node-name=blkdebug,file.image.node-name=file | grep "Cache"
echo
echo "=== Check that referenced BDSes don't inherit ==="
echo
drv_bkfile="if=none,driver=file,filename=$TEST_IMG.base,node-name=backing-file"
drv_bk="if=none,file=json:{'driver':'$IMGFMT',,'file':'backing-file',,'node-name':'backing'}"
drv_file="if=none,driver=file,filename=$TEST_IMG,node-name=file"
drv_img="if=none,id=blk,file=json:{'driver':'$IMGFMT',,'file':'file',,'backing':'backing',,'node-name':'image'}"
check_cache_all_separate()
{
# Check cache.direct
printf "cache.direct=on on blk\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img",cache.direct=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.direct=on on file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file",cache.direct=on -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.direct=on on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk",cache.direct=on -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.direct=on on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile",cache.direct=on -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
# Check cache.writeback
printf "\n\ncache.writeback=off on blk\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img",cache.writeback=off | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.writeback=off on file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file",cache.writeback=off -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.writeback=off on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk",cache.writeback=off -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.writeback=off on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile",cache.writeback=off -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
# Check cache.no-flush
printf "\n\ncache.no-flush=on on blk\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img",cache.no-flush=on | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk" -drive "$drv_file",cache.no-flush=on -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on backing\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile" -drive "$drv_bk",cache.no-flush=on -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
printf "\ncache.no-flush=on on backing-file\n"
echo "$hmp_cmds" | run_qemu -drive "$drv_bkfile",cache.no-flush=on -drive "$drv_bk" -drive "$drv_file" -drive "$drv_img" | grep -e "Cache" -e "[Cc]annot\|[Cc]ould not\|[Cc]an't"
}
echo
echo "--- Configure cache modes on the command line ---"
echo
# First check the inherited cache mode after opening the image.
hmp_cmds="info block image
info block file
info block backing
info block backing-file"
check_cache_all_separate
echo
echo "--- Cache modes after reopen (live snapshot) ---"
echo
# Then trigger a reopen and check that the cache modes are still the same.
hmp_cmds="snapshot_blkdev -n blk $TEST_IMG.snap $IMGFMT
info block blk
info block image
info block file
info block backing
info block backing-file"
check_cache_all_separate
echo
echo "--- Change cache modes with reopen (qemu-io command, flags) ---"
echo
# This one actually changes the cache mode with the reopen. For this test, the
# new cache mode is specified as flags, not as option.
hmp_cmds='qemu-io blk "reopen -c none"
info block image
info block file
info block backing
info block backing-file'
check_cache_all_separate
echo
echo "=== Reopening children instead of the root ==="
echo
files="if=none,file=$TEST_IMG,backing.file.filename=$TEST_IMG.base"
ids="node-name=image,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file"
echo
echo "--- Basic reopen ---"
echo
hmp_cmds='qemu-io none0 "reopen -o backing.cache.direct=on"
info block none0
info block image
info block file
info block backing
info block backing-file'
check_cache_all
echo
echo "--- Change cache mode after reopening child ---"
echo
# This checks that children with options explicitly set with reopen don't
# inherit these options from their parents any more
# TODO Implement node-name support for 'qemu-io' HMP command for -c
# Can use only -o to access child node options for now
hmp_cmds="qemu-io none0 \"reopen -o file.cache.direct=off,file.cache.no-flush=off\"
qemu-io none0 \"reopen -o backing.file.cache.direct=off,backing.file.cache.no-flush=on\"
qemu-io none0 \"reopen -c none\"
info block image
info block file
info block backing
info block backing-file"
echo "$hmp_cmds" | run_qemu -drive "$files","$ids" | grep "Cache"
echo
echo "--- Alignment after changing O_DIRECT ---"
echo
# Directly test the protocol level: Can unaligned requests succeed even if
# O_DIRECT was only enabled through a reopen and vice versa?
# Ensure image size is a multiple of the sector size (required for O_DIRECT)
$QEMU_IMG create -f file "$TEST_IMG" 1M | _filter_img_create
# And write some data (not strictly necessary, but it feels better to actually
# have something to be read)
$QEMU_IO -f file -c 'write 0 4096' "$TEST_IMG" | _filter_qemu_io
$QEMU_IO --cache=writeback -f file $TEST_IMG <<EOF | _filter_qemu_io
read 42 42
reopen -o cache.direct=on
read 42 42
reopen -o cache.direct=off
read 42 42
EOF
$QEMU_IO --cache=none -f file $TEST_IMG <<EOF | _filter_qemu_io
read 42 42
reopen -o cache.direct=off
read 42 42
reopen -o cache.direct=on
read 42 42
EOF
# success, all done
echo "*** done"
rm -f $seq.full
status=0
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