--- /dev/null
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+# Copyright (C) 2023 CTERA Networks. All Rights Reserved.
+#
+# FS QA Test No. 079
+#
+# Test data-only layers functionality.
+#
+. ./common/preamble
+_begin_fstest auto quick metacopy redirect prealloc
+
+# Import common functions.
+. ./common/filter
+. ./common/attr
+
+# real QA test starts here
+_supported_fs overlay
+# We use non-default scratch underlying overlay dirs, we need to check
+# them explicity after test.
+_require_scratch_nocheck
+_require_scratch_overlay_features redirect_dir metacopy
+_require_scratch_overlay_lowerdata_layers
+_require_xfs_io_command "falloc"
+
+# remove all files from previous tests
+_scratch_mkfs
+
+# File size on lower
+dataname="datafile"
+sharedname="shared"
+datacontent="data"
+dataname2="datafile2"
+datacontent2="data2"
+datasize="4096"
+
+# Number of blocks allocated by filesystem on lower. Will be queried later.
+datarblocks=""
+datarblocksize=""
+estimated_datablocks=""
+
+udirname="pureupper"
+ufile="upperfile"
+
+# Check metacopy xattr
+check_metacopy()
+{
+ local target=$1 exist=$2
+ local out_f target_f
+ local msg
+
+ out_f=$(_getfattr --absolute-names --only-values -n \
+ $OVL_XATTR_METACOPY $target 2>&1 | _filter_scratch)
+
+ if [ "$exist" == "y" ];then
+ [ "$out_f" == "" ] && return
+ echo "Metacopy xattr does not exist on ${target}. stdout=$out_f"
+ return
+ fi
+
+ if [ "$out_f" == "" ];then
+ echo "Metacopy xattr exists on ${target} unexpectedly."
+ return
+ fi
+
+ target_f=`echo $target | _filter_scratch`
+ msg="$target_f: trusted.overlay.metacopy: No such attribute"
+
+ [ "$out_f" == "$msg" ] && return
+
+ echo "Error while checking xattr on ${target}. stdout=$out"
+}
+
+# Check redirect xattr
+check_redirect()
+{
+ local target=$1
+ local expect=$2
+
+ value=$(_getfattr --absolute-names --only-values -n \
+ $OVL_XATTR_REDIRECT $target)
+
+ [[ "$value" == "$expect" ]] || echo "Redirect xattr incorrect. Expected=\"$expect\", actual=\"$value\""
+}
+
+# Check size
+check_file_size()
+{
+ local target=$1 expected_size=$2 actual_size
+
+ actual_size=$(_get_filesize $target)
+
+ [ "$actual_size" == "$expected_size" ] || echo "Expected file size $expected_size but actual size is $actual_size"
+}
+
+check_file_blocks()
+{
+ local target=$1 expected_blocks=$2 nr_blocks
+
+ nr_blocks=$(stat -c "%b" $target)
+
+ [ "$nr_blocks" == "$expected_blocks" ] || echo "Expected $expected_blocks blocks but actual number of blocks is ${nr_blocks}."
+}
+
+check_file_contents()
+{
+ local target=$1 expected=$2
+ local actual target_f
+
+ target_f=`echo $target | _filter_scratch`
+
+ read actual<$target
+
+ [ "$actual" == "$expected" ] || echo "Expected file $target_f contents to be \"$expected\" but actual contents are \"$actual\""
+}
+
+check_no_file_contents()
+{
+ local target=$1
+ local actual target_f out_f
+
+ target_f=`echo $target | _filter_scratch`
+ out_f=`cat $target 2>&1 | _filter_scratch`
+ msg="cat: $target_f: No such file or directory"
+
+ [ "$out_f" == "$msg" ] && return
+
+ echo "$target_f unexpectedly has content"
+}
+
+
+check_file_size_contents()
+{
+ local target=$1 expected_size=$2 expected_content=$3
+
+ check_file_size $target $expected_size
+ check_file_contents $target $expected_content
+}
+
+mount_overlay()
+{
+ local _lowerdir=$1
+
+ _overlay_scratch_mount_dirs "$_lowerdir" $upperdir $workdir -o redirect_dir=on,index=on,metacopy=on
+}
+
+mount_ro_overlay()
+{
+ local _lowerdir=$1
+
+ _overlay_scratch_mount_dirs "$_lowerdir" "-" "-" -o ro,redirect_dir=follow,metacopy=on
+}
+
+umount_overlay()
+{
+ $UMOUNT_PROG $SCRATCH_MNT
+}
+
+test_no_access()
+{
+ local _target=$1
+
+ mount_ro_overlay "$lowerdir::$datadir2::$datadir"
+
+ stat $SCRATCH_MNT/$_target >> $seqres.full 2>&1 || \
+ echo "No access to lowerdata layer $_target"
+
+ echo "Unmount and Mount rw"
+ umount_overlay
+ mount_overlay "$lowerdir::$datadir2::$datadir"
+ stat $SCRATCH_MNT/$_target >> $seqres.full 2>&1 || \
+ echo "No access to lowerdata layer $_target"
+ umount_overlay
+}
+
+test_common()
+{
+ local _lowerdirs=$1 _target=$2 _size=$3 _blocks=$4 _data="$5"
+ local _redirect=$6
+
+ echo "Mount ro"
+ mount_ro_overlay $_lowerdirs
+
+ # Check redirect xattr to lowerdata
+ [ -n "$_redirect" ] && check_redirect $lowerdir/$_target "$_redirect"
+
+ echo "check properties of metadata copied up file $_target"
+ check_file_size_contents $SCRATCH_MNT/$_target $_size "$_data"
+ check_file_blocks $SCRATCH_MNT/$_target $_blocks
+
+ # Do a mount cycle and check size and contents again.
+ echo "Unmount and Mount rw"
+ umount_overlay
+ mount_overlay $_lowerdirs
+ echo "check properties of metadata copied up file $_target"
+ check_file_size_contents $SCRATCH_MNT/$_target $_size "$_data"
+ check_file_blocks $SCRATCH_MNT/$_target $_blocks
+
+ # Trigger metadata copy up and check existence of metacopy xattr.
+ chmod 400 $SCRATCH_MNT/$_target
+ umount_overlay
+ check_metacopy $upperdir/$_target "y"
+ check_file_size_contents $upperdir/$_target $_size ""
+
+ # Trigger data copy up and check absence of metacopy xattr.
+ mount_overlay $_lowerdirs
+ $XFS_IO_PROG -c "falloc 0 1" $SCRATCH_MNT/$_target >> $seqres.full
+ echo "check properties of data copied up file $_target"
+ check_file_size_contents $SCRATCH_MNT/$_target $_size "$_data"
+ umount_overlay
+ check_metacopy $upperdir/$_target "n"
+ check_file_size_contents $upperdir/$_target $_size "$_data"
+}
+
+test_lazy()
+{
+ local _target=$1
+
+ mount_overlay "$lowerdir::$datadir2::$datadir"
+
+ # Metadata should be valid
+ check_file_size $SCRATCH_MNT/$_target $datasize
+ check_file_blocks $SCRATCH_MNT/$_target $estimated_datablocks
+
+ # But have no content
+ check_no_file_contents $SCRATCH_MNT/$_target
+
+ umount_overlay
+}
+
+create_basic_files()
+{
+ _scratch_mkfs
+ mkdir -p $datadir/subdir $datadir2/subdir $lowerdir $lowerdir2 $upperdir $workdir $workdir2
+ mkdir -p $upperdir/$udirname
+ echo "$datacontent" > $datadir/$dataname
+ chmod 600 $datadir/$dataname
+ echo "$datacontent2" > $datadir2/$dataname2
+ chmod 600 $datadir2/$dataname2
+
+ echo "$datacontent" > $datadir/$sharedname
+ echo "$datacontent2" > $datadir2/$sharedname
+ chmod 600 $datadir/$sharedname $datadir2/$sharedname
+
+ # Create files of size datasize.
+ for f in $datadir/$dataname $datadir2/$dataname2 $datadir/$sharedname $datadir2/$sharedname; do
+ $XFS_IO_PROG -c "falloc 0 $datasize" $f
+ $XFS_IO_PROG -c "fsync" $f
+ done
+
+ # Query number of block
+ datablocks=$(stat -c "%b" $datadir/$dataname)
+
+ # For lazy lookup file the block count is estimated based on size and block size
+ datablocksize=$(stat -c "%B" $datadir/$dataname)
+ estimated_datablocks=$(( ($datasize + $datablocksize - 1)/$datablocksize ))
+}
+
+prepare_midlayer()
+{
+ local _redirect=$1
+
+ _scratch_mkfs
+ create_basic_files
+ if [ -n "$_redirect" ]; then
+ mv "$datadir/$dataname" "$datadir/$_redirect"
+ mv "$datadir2/$dataname2" "$datadir2/$_redirect.2"
+ mv "$datadir/$sharedname" "$datadir/$_redirect.shared"
+ mv "$datadir2/$sharedname" "$datadir2/$_redirect.shared"
+ fi
+ # Create midlayer
+ _overlay_scratch_mount_dirs $datadir2:$datadir $lowerdir $workdir2 -o redirect_dir=on,index=on,metacopy=on
+ # Trigger a metacopy with or without redirect
+ if [ -n "$_redirect" ]; then
+ mv "$SCRATCH_MNT/$_redirect" "$SCRATCH_MNT/$dataname"
+ mv "$SCRATCH_MNT/$_redirect.2" "$SCRATCH_MNT/$dataname2"
+ mv "$SCRATCH_MNT/$_redirect.shared" "$SCRATCH_MNT/$sharedname"
+ else
+ chmod 400 $SCRATCH_MNT/$dataname
+ chmod 400 $SCRATCH_MNT/$dataname2
+ chmod 400 $SCRATCH_MNT/$sharedname
+ fi
+ umount_overlay
+}
+
+# Create test directories
+datadir=$OVL_BASE_SCRATCH_MNT/data
+datadir2=$OVL_BASE_SCRATCH_MNT/data2
+lowerdir=$OVL_BASE_SCRATCH_MNT/lower
+upperdir=$OVL_BASE_SCRATCH_MNT/upper
+workdir=$OVL_BASE_SCRATCH_MNT/workdir
+workdir2=$OVL_BASE_SCRATCH_MNT/workdir2
+
+echo -e "\n== Check no follow to lowerdata layer without redirect =="
+prepare_midlayer
+test_no_access "$dataname"
+test_no_access "$dataname2"
+test_no_access "$sharedname"
+
+echo -e "\n== Check no follow to lowerdata layer with relative redirect =="
+prepare_midlayer "$dataname.renamed"
+test_no_access "$dataname"
+test_no_access "$dataname2"
+test_no_access "$sharedname"
+
+echo -e "\n== Check follow to lowerdata layer with absolute redirect =="
+prepare_midlayer "/subdir/$dataname"
+test_common "$lowerdir::$datadir2::$datadir" "$dataname" $datasize $datablocks \
+ "$datacontent" "/subdir/$dataname"
+test_common "$lowerdir::$datadir2::$datadir" "$dataname2" $datasize $datablocks \
+ "$datacontent2" "/subdir/$dataname.2"
+# Shared file should be picked from upper datadir
+test_common "$lowerdir::$datadir2::$datadir" "$sharedname" $datasize $datablocks \
+ "$datacontent2" "/subdir/$dataname.shared"
+
+echo -e "\n== Check lazy follow to lowerdata layer =="
+
+prepare_midlayer "/subdir/$dataname"
+rm $datadir/subdir/$dataname
+test_lazy $dataname
+
+
+# success, all done
+status=0
+exit
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