On 1/6/20 8:42 AM, Yang Xu wrote: > Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx> Hello Yang Xu. Thanks. Patch applied. Cheers, Michael > --- > 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) > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
