Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx> --- man4/loop.4 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/man4/loop.4 b/man4/loop.4 index a56586fe6..afb1d05c5 100644 --- a/man4/loop.4 +++ b/man4/loop.4 @@ -152,6 +152,13 @@ Resize a live loop device. One can change the size of the underlying backing store and then use this operation so that the loop driver learns about the new size. This operation takes no argument. +.TP +.BR LOOP_SET_DIRECT_IO " (since Linux 4.10)" +.\" commit ab1cb278bc7027663adbfb0b81404f8398437e11 +Set DIRECT IO mode on the loop device. So it can be used to open backing +file. The (third) +.BR ioctl(2) +argument is an unsigned long value. non-zero represents direct IO mode. .PP Since Linux 2.6, there are two new .BR ioctl (2) -- 2.18.0
