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 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) -- 2.18.0
