overlay: test copy up files from lower dir

Test copy up files from lower dir that are <, =, > 4G in size.

Kernel commit 0480334fa604 ("ovl: use O_LARGEFILE in ovl_copy_up()")
fixed bug when copying up large file(>4G) from lower dir.

Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/overlay/001

@@ -0,0 +1,81 @@
+#! /bin/bash
+# FS QA Test 001
+#
+# Test copy up files from lower dir that are <, =, > 4G in size.
+#
+# Kernel commit 0480334fa604 ("ovl: use O_LARGEFILE in ovl_copy_up()")
+# fixed bug when copying up large file from lower dir.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Red Hat Inc. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+
+# Remove all files from previous tests
+_scratch_mkfs
+
+# overlay copy_up doesn't deal with sparse file well, holes will be filled by
+# zeros, so at least (4G + 4G + 8k) free space is needed on $SCRATCH_DEV,
+# where $SCRATCH_DEV is actually a test dir used in overlay testing
+_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
+mkdir -p $lowerdir
+touch $lowerdir/zero_size
+$XFS_IO_PROG -fc "pwrite 0 4k" $lowerdir/less_than_4g >>$seqres.full
+$XFS_IO_PROG -fc "pwrite 4294963200 4k" $lowerdir/4gfile >>$seqres.full
+$XFS_IO_PROG -fc "pwrite 4g 4k" $lowerdir/larger_than_4g >>$seqres.full
+
+_scratch_mount
+
+echo "Silence is golden"
+
+# Open the files should succeed, no errors are expected (e.g. EFBIG)
+for f in $SCRATCH_MNT/*; do
+	$XFS_IO_PROG -c "open" $f >>$seqres.full
+done
+
+# success, all done
+status=0
+exit

tests/overlay/001.out

@@ -0,0 +1,2 @@
+QA output created by 001
+Silence is golden

tests/overlay/Makefile

@@ -0,0 +1,20 @@
+#
+# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
+#
+
+TOPDIR = ../..
+include $(TOPDIR)/include/builddefs
+
+TEST_DIR = overlay
+TARGET_DIR = $(PKG_LIB_DIR)/$(TESTS_DIR)/$(TEST_DIR)
+
+include $(BUILDRULES)
+
+install:
+	$(INSTALL) -m 755 -d $(TARGET_DIR)
+	$(INSTALL) -m 755 [0-9]?? $(TARGET_DIR)
+	$(INSTALL) -m 644 group $(TARGET_DIR)
+	$(INSTALL) -m 644 [0-9]??.* $(TARGET_DIR)
+
+# Nothing.
+install-dev install-lib:

tests/overlay/group

@@ -0,0 +1,6 @@
+# QA groups control file
+# Defines test groups and nominal group owners
+# - do not start group names with a digit
+# - comment line before each group is "new" description
+#
+001 auto quick copyup