mirror of https://github.com/mkerrisk/man-pages
loop.4: Document LOOP_SET_DIRECT_IO
Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -152,6 +152,13 @@ Resize a live loop device.
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One can change the size of the underlying backing store and then use this
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operation so that the loop driver learns about the new size.
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This operation takes no argument.
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.TP
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.BR LOOP_SET_DIRECT_IO " (since Linux 4.10)"
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.\" commit ab1cb278bc7027663adbfb0b81404f8398437e11
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Set DIRECT IO mode on the loop device. So it can be used to open backing
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file. The (third)
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.BR ioctl(2)
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argument is an unsigned long value. non-zero represents direct IO mode.
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.PP
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Since Linux 2.6, there are two new
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.BR ioctl (2)
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