loop.4: Document LO_FLAGS_DIRECT_IO flag

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man4/loop.4 b/man4/loop.4
index a3c59310dac99d769143411011fbad1ccbe17c5f..1f8a31ac76e406e730a39ae138510dfcb288ddfa 100644 (file)
--- a/man4/loop.4
+++ b/man4/loop.4
@@ -130,6 +130,10 @@ The loopback device will autodestruct on last close.
 .BR LO_FLAGS_PARTSCAN " (since Linux 3.2)"
 .\" commit e03c8dd14915fabc101aa495828d58598dc5af98
 Allow automatic partition scanning.
+.TP
+.BR LO_FLAGS_DIRECT_IO " (since Linux 4.10)"
+.\" commit 2e5ab5f379f96a6207c45be40c357ebb1beb8ef3
+Use direct io mode to access backing file.
 .RE
 .TP
 .B LOOP_GET_STATUS