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https://github.com/linux-apfs/apfstests.git
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zhangyi (F)
3ba014aaba
No post-test check of the overlay dirs is required if case leaves corrupt filesystem after test. We shoud use _require_scratch_nocheck() instead of _require_scratch() in these cases. Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
110 lines
3.2 KiB
Bash
Executable File
110 lines
3.2 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 049
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#
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# Test multiple redirects to the same lower dir.
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#
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# Multiple redirects to the same lower dir will falsely return the same
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# st_ino/st_dev for two different upper dirs and will cause 'diff' to
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# falsely report that content of directories is the same when it is not.
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#
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# This test checks that overlayfs detects and fails lookup of a multiply
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# redirected dir.
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#
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# The check for multiply redirected dir was implemented by kernel titled
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# "ovl: hash directory inodes for fsnotify"
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#
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#-----------------------------------------------------------------------
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# Copyright (C) 2018 CTERA Networks. All Rights Reserved.
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# Author: Amir Goldstein <amir73il@gmail.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# Rename lower dir to create a redirected upper dir and
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# touch lower file to create copy up with origin xattr
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create_redirect()
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{
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local redirect=$1
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mkdir -p $lowerdir/origin
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touch $lowerdir/origin/file
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_scratch_mount -o redirect_dir=on
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touch $SCRATCH_MNT/origin/file
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mv $SCRATCH_MNT/origin $SCRATCH_MNT/$redirect
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$UMOUNT_PROG $SCRATCH_MNT
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs overlay
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_supported_os Linux
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_require_scratch_nocheck
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_require_scratch_feature redirect_dir
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# remove all files from previous runs
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_scratch_mkfs
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upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
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lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
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# Create redirected dir with copied up file
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create_redirect redirect1
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# Duplicate the redirected dir and copied up file
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cp -a $upperdir/redirect1 $upperdir/redirect2
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# Diverge the content of the two copies of file
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# and the content of two copies of redirected dir
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echo right >> $upperdir/redirect1/file
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touch $upperdir/redirect1/right
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echo wrong >> $upperdir/redirect2/file
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touch $upperdir/redirect2/wrong
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_scratch_mount -o redirect_dir=on
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# If both copies of file/dir use the same st_dev/st_ino in overlay
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# diff won't detect that their content differs
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diff -q $SCRATCH_MNT/redirect1/file $SCRATCH_MNT/redirect2/file &>/dev/null && \
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echo "diff on files inside duplicate redirect parent doesn't know right from wrong!"
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diff -q $SCRATCH_MNT/redirect1 $SCRATCH_MNT/redirect2 &> /dev/null && \
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echo "diff on duplicate redirect dirs doesn't know right from wrong!"
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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