overlay: rename OVERLAY_LOWER/UPPER/WORK_DIR

As preparation step for configuring test/scratch base fs
for overlay tests:

- Rename OVERLAY_LOWER/UPPER/WORK_DIR => OVL_LOWER/UPPER/WORK
  because we want to use OVL_ prefix for all base fs vars

- Prepend "ovl-" prefix to lower/upper/work path values to
  isolate the overlay test dirs when running on a base fs
  that is also used to run non overlay tests

- Make those vars values non-configurable, because lower/upper/work
  directory names are an internal test detail which should
  not concern the user and because we wish to simplify
  and document the overlay tests setup

- Add helper _filter_ovl_dirs and use it to filter output
  of test overlay/023 which matches the constant string "work"

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

common/config

@@ -77,9 +77,11 @@ export XFS_MKFS_OPTIONS=${XFS_MKFS_OPTIONS:=-bsize=4096}
 export TIME_FACTOR=${TIME_FACTOR:=1}
 export LOAD_FACTOR=${LOAD_FACTOR:=1}
 export DEBUGFS_MNT=${DEBUGFS_MNT:="/sys/kernel/debug"}
-export OVERLAY_UPPER_DIR=${OVERLAY_UPPER_DIR:="upper"}
-export OVERLAY_LOWER_DIR=${OVERLAY_LOWER_DIR:="lower"}
-export OVERLAY_WORK_DIR=${OVERLAY_WORK_DIR:="work"}
+
+# some constants for overlayfs setup
+export OVL_UPPER="ovl-upper"
+export OVL_LOWER="ovl-lower"
+export OVL_WORK="ovl-work"
 
 export PWD=`pwd`
 #export DEBUG=${DEBUG:=...} # arbitrary CFLAGS really.

common/filter

@@ -424,5 +424,12 @@ _filter_lostfound()
 	sed -e '/^lost+found$/d'
 }
 
+_filter_ovl_dirs()
+{
+	sed -e "s,$OVL_LOWER,OVL_LOWER,g" \
+	    -e "s,$OVL_UPPER,OVL_UPPER,g" \
+	    -e "s,$OVL_WORK,OVL_WORK,g"
+}
+
 # make sure this script returns success
 /bin/true

common/rc

@@ -277,7 +277,7 @@ _common_dev_mount_options()
 
 _overlay_basic_mount_options()
 {
-	echo "-o lowerdir=$1/$OVERLAY_LOWER_DIR,upperdir=$1/$OVERLAY_UPPER_DIR,workdir=$1/$OVERLAY_WORK_DIR"
+	echo "-o lowerdir=$1/$OVL_LOWER,upperdir=$1/$OVL_UPPER,workdir=$1/$OVL_WORK"
 }
 
 _overlay_mount_options()
@@ -336,6 +336,15 @@ _overlay_mount_dirs()
 		    -o workdir=$workdir $*
 }
 
+_overlay_mkdirs()
+{
+	local dir=$1
+
+	mkdir -p $dir/$OVL_UPPER
+	mkdir -p $dir/$OVL_LOWER
+	mkdir -p $dir/$OVL_WORK
+}
+
 # Given a dir, set up 3 subdirectories and mount on the given mnt.
 # The dir is used as the mount device so it can be seen from df or mount
 _overlay_mount()
@@ -346,12 +355,10 @@ _overlay_mount()
 
 	_supports_filetype $dir || _notrun "upper fs needs to support d_type"
 
-	mkdir -p $dir/$OVERLAY_UPPER_DIR
-	mkdir -p $dir/$OVERLAY_LOWER_DIR
-	mkdir -p $dir/$OVERLAY_WORK_DIR
+	_overlay_mkdirs $dir
 
-	_overlay_mount_dirs $dir/$OVERLAY_LOWER_DIR $dir/$OVERLAY_UPPER_DIR \
-			    $dir/$OVERLAY_WORK_DIR $OVERLAY_MOUNT_OPTIONS \
+	_overlay_mount_dirs $dir/$OVL_LOWER $dir/$OVL_UPPER \
+			    $dir/$OVL_WORK $OVERLAY_MOUNT_OPTIONS \
 			    $SELINUX_MOUNT_OPTIONS $* $dir $mnt
 }
 

tests/overlay/001

@@ -60,7 +60,7 @@ _scratch_mkfs
 _require_fs_space $SCRATCH_DEV $((4*1024*1024*2 + 8))
 
 # Create test files with different sizes in lower dir
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 touch $lowerdir/zero_size
 $XFS_IO_PROG -fc "pwrite 0 4k" $lowerdir/less_than_4g >>$seqres.full

tests/overlay/002

@@ -59,7 +59,7 @@ _require_scratch
 _scratch_mkfs
 
 # Create our test file.
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 touch $lowerdir/foobar
 

tests/overlay/003

@@ -60,7 +60,7 @@ _require_scratch
 _scratch_mkfs
 
 # Create test files dirs in lower dir
-lowerdir=${SCRATCH_DEV}/${OVERLAY_LOWER_DIR}
+lowerdir=${SCRATCH_DEV}/${OVL_LOWER}
 mkdir -p $lowerdir
 
 touch ${lowerdir}/test_file

tests/overlay/004

@@ -53,8 +53,8 @@ _require_user
 _scratch_mkfs
 
 # Create test file in lower dir
-lowerdir=${SCRATCH_DEV}/${OVERLAY_LOWER_DIR}
-upperdir=${SCRATCH_DEV}/${OVERLAY_UPPER_DIR}
+lowerdir=${SCRATCH_DEV}/${OVL_LOWER}
+upperdir=${SCRATCH_DEV}/${OVL_UPPER}
 mkdir -p $lowerdir
 touch ${lowerdir}/attr_file1
 chmod 000 ${lowerdir}/attr_file1

tests/overlay/006

@@ -57,15 +57,15 @@ echo "Silence is golden"
 _scratch_mkfs
 
 # Create test file/dir before mount
-mkdir $SCRATCH_DEV/$OVERLAY_LOWER_DIR
-mkdir $SCRATCH_DEV/$OVERLAY_UPPER_DIR
-touch $SCRATCH_DEV/$OVERLAY_LOWER_DIR/lowertestfile
-mkdir $SCRATCH_DEV/$OVERLAY_UPPER_DIR/uppertestdir
+mkdir -p $SCRATCH_DEV/$OVL_LOWER
+mkdir -p $SCRATCH_DEV/$OVL_UPPER
+touch $SCRATCH_DEV/$OVL_LOWER/lowertestfile
+mkdir $SCRATCH_DEV/$OVL_UPPER/uppertestdir
 
 _scratch_mount
 
 # rename lowertestfile to uppertestdir, this triggers copyup and creates
-# whiteout in $OVERLAY_UPPER_DIR
+# whiteout in $OVL_UPPER
 mv $SCRATCH_MNT/lowertestfile $SCRATCH_MNT/uppertestdir
 # the lowertestfile can be removed
 rm $SCRATCH_MNT/uppertestdir/lowertestfile

tests/overlay/008

@@ -56,14 +56,14 @@ _require_user
 _scratch_mkfs
 
 # Create test file on lower dir, and chown to fsgqa user
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
-mkdir $lowerdir
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
+mkdir -p $lowerdir
 touch $lowerdir/testfile
 chown fsgqa:fsgqa $lowerdir/testfile
 
 # chown upperdir to fsgqa user, so new file/dir can be created by the user
-upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
-mkdir $upperdir
+upperdir=$SCRATCH_DEV/$OVL_UPPER
+mkdir -p $upperdir
 chown fsgqa:fsgqa $upperdir
 
 _scratch_mount

tests/overlay/009

@@ -54,7 +54,7 @@ _require_scratch
 _scratch_mkfs
 
 # Create test file in lowerdir
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 touch $lowerdir/testfile
 

tests/overlay/010

@@ -55,10 +55,10 @@ _scratch_mkfs
 
 # Need two lower dirs in this test, and we mount overlay ourselves,
 # create upper and workdir as well
-lowerdir1=$SCRATCH_DEV/$OVERLAY_LOWER_DIR.1
-lowerdir2=$SCRATCH_DEV/$OVERLAY_LOWER_DIR.2
-upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
-workdir=$SCRATCH_DEV/$OVERLAY_WORK_DIR
+lowerdir1=$SCRATCH_DEV/$OVL_LOWER.1
+lowerdir2=$SCRATCH_DEV/$OVL_LOWER.2
+upperdir=$SCRATCH_DEV/$OVL_UPPER
+workdir=$SCRATCH_DEV/$OVL_WORK
 mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir
 
 # One lowerdir contains test dir and test files, the other contains whiteout

tests/overlay/011

@@ -58,8 +58,8 @@ _require_attrs
 _scratch_mkfs
 
 # Create test dir on upper and make it opaque by setting proper xattr
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
-upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
+upperdir=$SCRATCH_DEV/$OVL_UPPER
 mkdir -p $lowerdir/testdir
 mkdir -p $upperdir/testdir
 $SETFATTR_PROG -n "trusted.overlay.opaque" -v "y" $upperdir/testdir

tests/overlay/012

@@ -55,8 +55,8 @@ _require_scratch
 # remove all files from previous runs
 _scratch_mkfs
 
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
-upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
+upperdir=$SCRATCH_DEV/$OVL_UPPER
 mkdir -p $lowerdir/test
 
 _scratch_mount

tests/overlay/013

@@ -54,8 +54,8 @@ _require_test_program "t_truncate_self"
 _scratch_mkfs
 
 # copy test program to lower and upper dir
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
-upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
+upperdir=$SCRATCH_DEV/$OVL_UPPER
 mkdir -p $lowerdir
 mkdir -p $upperdir
 cp $here/src/t_truncate_self $lowerdir/test_lower

tests/overlay/015

@@ -57,7 +57,7 @@ _scratch_mkfs
 umask 022
 
 # Create test dir in lower dir and set sgid bit
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir/dir
 chown $qa_user:$qa_group $lowerdir/dir
 chmod 2775 $lowerdir/dir

tests/overlay/016

@@ -57,7 +57,7 @@ rm -f $seqres.full
 _scratch_mkfs >>$seqres.full 2>&1
 
 # Create our test files.
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 echo "This is old news" > $lowerdir/foo
 echo "This is old news" > $lowerdir/bar

tests/overlay/017

@@ -60,7 +60,7 @@ _scratch_mkfs >>$seqres.full 2>&1
 # Not dealing with hardlinks here, because there is more to test
 # then stable inode number.
 # Hardlinks will get a test of their own.
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 mkdir $lowerdir/dir
 touch $lowerdir/file

tests/overlay/018

@@ -55,7 +55,7 @@ rm -f $seqres.full
 _scratch_mkfs >>$seqres.full 2>&1
 
 # Create 2 hardlinked files in lower
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 echo "patient zero" >> $lowerdir/foo
 ln $lowerdir/foo $lowerdir/bar

tests/overlay/019

@@ -51,7 +51,7 @@ _require_scratch
 # Remove all files from previous tests
 _scratch_mkfs
 
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir
 
 _scratch_mount

tests/overlay/020

@@ -55,7 +55,7 @@ _require_scratch
 # Remove all files from previous tests
 _scratch_mkfs
 
-lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+lowerdir=$SCRATCH_DEV/$OVL_LOWER
 mkdir -p $lowerdir/dir
 
 _scratch_mount