Mark Fasheh e70dbedb7b scoutfs: dlmglue support for concurrent writer locks ...

This is a bit trickier than just dropping in a cw holders count.

dlmglue was comparing levels by a simple greater than or less than check.
Since CW locks are not compatible with PR or EX, this check breaks down.
Instead we provide a function which can tell us whether a conversion to a
given lock levels is is compatible (cache-wise) with the level we have.

We also have some slightly more complicated logic in downconvert. As a
result we update the helper that dlmglue uses to choose a downconvert level.

Signed-off-by: Mark Fasheh <mfasheh@versity.com>

2017-11-16 16:14:38 -08:00

kmod

scoutfs: dlmglue support for concurrent writer locks

2017-11-16 16:14:38 -08:00

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