mount: add note about loopdev reuse to mount.8

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/sys-utils/mount.8 b/sys-utils/mount.8
index 3197c8e6656e1c1b2c563e61d47ea1ba605d84fa..eb0dd988fa562c4babe6668eca95cc25c5d775af 100644 (file)
--- a/sys-utils/mount.8
+++ b/sys-utils/mount.8
@@ -2931,6 +2931,10 @@ independently of
 You can also free a loop device by hand, using
 .BR "losetup \-d " or " umount \-d" .
 
+Since util-linux v2.29 mount command re-uses the loop device rather than
+initialize a new device if the same backing file is already mounted with the
+same offset.
+
 .SH RETURN CODES
 .B mount
 has the following return codes (the bits can be ORed):