On 1/6/20 8:42 AM, Yang Xu wrote: > Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx> Thanks, Yang Xu. Patch applied. Cheers, Michael > --- > man4/loop.4 | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/man4/loop.4 b/man4/loop.4 > index afb1d05c5..9fd2b3eb4 100644 > --- a/man4/loop.4 > +++ b/man4/loop.4 > @@ -159,6 +159,13 @@ 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. > +.TP > +.BR LOOP_SET_BLOCK_SIZE " (since Linux 4.14)" > +.\" commit 89e4fdecb51cf5535867026274bc97de9480ade5 > +Set the block size of the loop device. The (third) > +.BR ioctl(2) > +argument is an unsigned long value. This value must be 2 to the power of N > +and in range [512,pagesize]. Otherwise, it will get EINVAL error. > .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/
