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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2023 CTERA Networks. All Rights Reserved.
#
# FS QA Test 082
#
# Test for a regression in copy up of symlink that has the noatime inode
# attribute.
#
# kernel commit 72db82115d2b ("ovl: copy up sync/noatime fileattr flags")
# from v5.15 introduced the regression.
#
. ./common/preamble
_begin_fstest auto quick copyup symlink atime
# real QA test starts here
_supported_fs overlay
_fixed_by_kernel_commit ab048302026d \
"ovl: fix failed copyup of fileattr on a symlink"
_require_scratch
_require_chattr A
# remove all files from previous runs
_scratch_mkfs
# prepare lower test dir with NOATIME flag
lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
mkdir -p $lowerdir/testdir
$CHATTR_PROG +A $lowerdir/testdir >> $seqres.full 2>&1 ||
echo "failed to set No_Atime flag on $lowerdir/testdir"
# The NOATIME is inherited to children symlink in ext4/fs2fs
# (and on tmpfs on recent kernels).
# The overlayfs test will not fail unless base fs is
# one of those filesystems.
#
# The problem with this inheritence is that the NOATIME flag is inherited
# to a symlink and the flag does take effect, but there is no way to query
# the flag (lsattr) or change it (chattr) on a symlink, so overlayfs will
# fail when trying to copy up NOATIME flag from lower to upper symlink.
#
touch $lowerdir/testdir/foo
ln -sf foo $lowerdir/testdir/lnk
$LSATTR_PROG -l $lowerdir/testdir/foo >> $seqres.full
before=$(stat -c %x $lowerdir/testdir/lnk)
echo "symlink atime before readlink: $before" >> $seqres.full 2>&1
sleep 2s
cat $lowerdir/testdir/lnk
after=$(stat -c %x $lowerdir/testdir/lnk)
echo "symlink atime after readlink: $after" >> $seqres.full 2>&1
[ "$before" == "$after" ] || \
_notrun "base fs $OVL_BASE_FSTYP does not inherit No_Atime flag on symlink"
# mounting overlay
_scratch_mount
# moving symlink will try to copy up lower symlink flags
# and fails with error ENXIO, if the bug is reproduced
mv $SCRATCH_MNT/testdir/lnk $SCRATCH_MNT/
# success, all done
echo "Silence is golden"
status=0
exit
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