From: Filipe Manana <fdmanana@xxxxxxxx>
Add a new helper that is similar to _count_extents() except that extents
that are shared several times by the file with itself (reflinked at
different file offsets) are accounted 1 time only, instead of N times.
This is motivated by a subsequent test for btrfs that will use this new
helper, to verify that send streams are issuing reflink operations.
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
---
common/rc | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/common/rc b/common/rc
index 238ffef9..3c412178 100644
--- a/common/rc
+++ b/common/rc
@@ -3202,6 +3202,15 @@ _count_extents()
$XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l
}
+# Similar to _count_extents() but if any extent is shared multiples times in
+# the file (reflinked to different file offsets), it is accounted as 1 extent
+# instead of N extents.
+_count_exclusive_extents()
+{
+ $XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep -v hole | \
+ cut -d ' ' -f 3 | sort | uniq | wc -l
+}
+
_count_holes()
{
$XFS_IO_PROG -r -c "fiemap" $1 | tail -n +2 | grep hole | wc -l
--
2.11.0
