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loop.4: Document LOOP_SET_BLOCK_SIZE 

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Yang Xu 2020-01-06 15:42:23 +08:00 committed by Michael Kerrisk
parent 9d40af2a55
commit 89593f2df6
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man4/loop.4
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@ -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)