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Murphy Zhou
85a3354eda
When nfs_export is enabled, the link count of upper dir objects are more then the expected number in this testcase. Because extra index entries are linked to upper inodes. Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
119 lines
3.0 KiB
Bash
Executable File
119 lines
3.0 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2020 Chengguang Xu <cgxu519@mykernel.net>.
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# All Rights Reserved.
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#
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# FS QA Test 073
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#
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# Test whiteout inode sharing functionality.
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#
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# A "whiteout" is an object that has special meaning in overlayfs.
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# A whiteout on an upper layer will effectively hide a matching file
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# in the lower layer, making it appear as if the file didn't exist.
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#
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# Whiteout inode sharing means multiple whiteout objects will share
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# one inode in upper layer, without this feature every whiteout object
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# will consume one inode in upper layer.
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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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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs overlay
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_require_scratch
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# Require index dir to test if workdir/work is not in use
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# which implies that whiteout sharing is supported
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_require_scratch_overlay_features index
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lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
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upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
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workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
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# Make some testing files in lowerdir.
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# Argument:
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# $1: Testing file number
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make_lower_files()
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{
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mkdir $lowerdir/dir
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for name in `seq ${1}`; do
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touch $lowerdir/${name} &>/dev/null
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done
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}
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# Delete all copied-up files in upperdir.
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make_whiteout_files()
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{
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# whiteout inode sharing implies that workdir/work is not in use
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# If workdir/work is in use, delete of lower dir will fail and
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# we won't run the test.
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rmdir $workdir/work
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rmdir $SCRATCH_MNT/dir &>/dev/null || \
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_notrun "overlay does not support whiteout inode sharing"
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rm $SCRATCH_MNT/* &>/dev/null
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}
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# Check link count of whiteout files.
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# Arguments:
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# $1: Testing file number
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# $2: Expected link count
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check_whiteout_files()
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{
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for name in dir `seq ${1}`; do
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local real_count=`stat -c %h $upperdir/${name} 2>/dev/null`
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if [[ ${2} != $real_count ]]; then
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echo "Expected link count is ${2} but real count is $real_count, file name is ${name}"
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fi
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done
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local tmpfile_count=`ls $workdir/index/\#* 2>/dev/null |wc -l 2>/dev/null`
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if [[ -n "$tmpfile_count" && $tmpfile_count > 1 ]]; then
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echo "There are more than one whiteout tmpfile in index dir!"
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ls -l $workdir/index/\#* 2>/dev/null
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fi
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}
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# Run test case with specific arguments.
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# Arguments:
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# $1: Testing file number
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# $2: Expected link count
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run_test_case()
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{
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_scratch_mkfs
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make_lower_files ${1}
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# There will be extra hard links with nfs_export enabled which
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# is expected. Turn it off explicitly to avoid the false alarm.
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_scratch_mount -o "index=on,nfs_export=off"
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make_whiteout_files
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check_whiteout_files ${1} ${2}
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_scratch_unmount
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}
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# Test case
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file_count=10
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# +1 for dir +1 for temp whiteout
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link_count=12
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run_test_case $file_count $link_count
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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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