[dm-devel] [PATCH] dm-mpath: always return reservation conflict
Christoph Hellwig
hch at lst.de
Wed Jul 15 11:56:09 UTC 2015
An array can't issue a reservation, the initiator needs to register
it. Right now the only way to do it is through SG_IO passthrough,
which is a best luck effort it I/O isn't also using SG_IO and can't
be properly supported because of that.
However I will submit an in-kernel reservation API soon which will
allow us to have that sort of control. My current prototyp only allows
for all-path reservations as I couldn't come up with a use case for
per-path reservations, but if such a need should arise we can add it
and take that into account in the multipathing code.
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