+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 Red Hat, Inc. All Rights Reserved.
+#
+# FS QA Test No. generic/568
+#
+# Test that fallocating an unaligned range allocates all blocks
+# touched by that range
+#
+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 "$tmp".*
+ rm -f "$TEST_DIR/falloctest-$seq"
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_xfs_io_command "falloc"
+
+testfile="$TEST_DIR/falloctest-$seq"
+
+# Fallocate 2 bytes across a block boundary
+block_size=$(_get_file_block_size "$TEST_DIR")
+$XFS_IO_PROG -f -c "falloc $((block_size - 1)) 2" "$testfile"
+
+# Both the first blocks should be allocated now. Check that by
+# inquiring whether the file grows when we write to the two bytes we
+# have just fallocated.
+
+allocated_size_before=$(($(stat -c '%b * %B' "$testfile")))
+
+$XFS_IO_PROG -c "pwrite $((block_size - 1)) 2" "$testfile" \
+ | _filter_xfs_io | sed -e "s/$((block_size - 1))/block_size - 1/"
+
+allocated_size_after=$(($(stat -c '%b * %B' "$testfile")))
+
+if [ $allocated_size_after -gt $allocated_size_before ]; then
+ echo "ERROR: File grew from ${allocated_size_before} B to" \
+ "${allocated_size_after} B when writing to the fallocated range."
+else
+ echo "OK: File did not grow."
+fi
+
+status=0
+exit