md: register new md sysfs file 'uuid' read-only
Report the UUID of the MD array in the following format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx This is useful if you don't want to wait for udev to identify array. And it is also easy for script to monitor it with the format. Signed-off-by:Sebastian Parschauer <s.parschauer@gmx.de> [Guoqing: mention the change in md.rst] Signed-off-by:
Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Signed-off-by:
Song Liu <songliubraving@fb.com>
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