Jens Axboe 82f402fefa
null_blk: add support for shared tags ...
Some storage drivers need to share tag sets between devices. It's
useful to be able to model that with null_blk, to find hangs or
performance issues.
Add a 'shared_tags' bool module parameter that. If that is set to
true and nr_devices is bigger than 1, all devices allocated will
share the same tag set.
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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