On Wednesday November 8, kay.sievers@xxxxxxxx wrote:
>
> Is there a sysfs file or something similar(we could also call a md-tool)
> udev could look at, before it tries to open the device? Like:
> KERNEL=="md*", ATTR{state}=="active", IMPORT{program}= ...
If the /sys/block/mdX directory exists at all, it is safe to open the
device-special file. But that is racy. It could disappear between
checking that the dir exists, and opening the device-special-file.
I still think it would make SO much sense if /sys/block/md4/dev were a
device-special-file instead of a (silly) ascii file with 9:4. Then
this race could be closed. But I feel that is a battle I've never
going to win.
You could look at /sys/block/mdX/md/array_state. If that contains
'clean' or 'inactive' then there is no point opening the device.
Otherwise there might be a point, and the race would be a lot harder
to lose.
I guess it is time for me to learn about udev config files...
NeilBrown
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