[PATCH v2 2/4] punch: Implement fixup for fiemap range queries

[Nikolay Borisov <nborisov@suse.com>]

With the new  range query support for the fiemap command,
the command also started printing hole extent for files which
consist of only a hole. This change breaks tests which are
executed with a version of xfs_io that doesn't support fiemap's
range query.

Fix this by implementing a function which will fixup the output
of tests which are broken by emulating the output on older
xfs_io versions

Signed-off-by: Nikolay Borisov <nborisov@suse.com> 
---
 common/punch | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/common/punch b/common/punch
index c4ed261..b20dc30 100644
--- a/common/punch
+++ b/common/punch
@@ -218,6 +218,23 @@ _filter_fiemap()
 	_coalesce_extents
 }
 
+_fiemap_range_fixup()
+{
+	#check if we support ranged query
+	$XFS_IO_PROG -c "help fiemap" | head -n 1 | grep -q "[offset [len]]"
+	local range_sup=$?
+	#check if the file consists of a single hole only
+	echo "$1" | grep -q "^0\: \[.*\]\: hole$"
+	local sole_hole=$?
+	local filesize="$(((`stat -c %s $1` / 512) - 1))"
+	local output_line_num=`$XFS_IO_PROG -c 'fiemap' $testfile | wc -l`
+
+	if [ $range_sup -eq 1 ] && [ $sole_hole -eq 1  ] && [ $output_line_num -eq 1 ]
+	then
+		echo "0: [0..$filesize]: hole"
+	fi
+}
+
 _filter_fiemap_flags()
 {
 	$AWK_PROG '
@@ -363,6 +380,7 @@ _test_generic_punch()
 	$XFS_IO_PROG -f -c "truncate $_20k" \
 		-c "$zero_cmd $_4k $_8k" \
 		-c "$map_cmd -v" $testfile | $filter_cmd
+	_fiemap_range_fixup $testfile
 	[ $? -ne 0 ] && die_now
 	_md5_checksum $testfile
 
@@ -470,6 +488,7 @@ _test_generic_punch()
 		-c "pwrite $_8k $_4k" $sync_cmd \
 		-c "$zero_cmd $_4k $_12k" \
 		-c "$map_cmd -v" $testfile | $filter_cmd
+	_fiemap_range_fixup $testfile
 	[ $? -ne 0 ] && die_now
 	_md5_checksum $testfile
 
-- 
2.7.4