Zach Brown b3b2693939 Add simple debugging range locking layer ...

We can work on shared mechanics without requiring a full locking server.
We can stand up a simple layer which uses shared data structures in a
kernel image to lock between mounts in the same kernel.

On mount we add supers to a list.  Held locks are tracked in a rbtree.
A lock attempt blocks until it doesn't conflict with anything in the
rbtree.

As locks are acquired we walk all the other supers and write/invaludate
any items they have which intersect with the acquired range.  This is
easier to implement and less efficient than caching locks after they're
unlocked and implementing downconvert/blocking/revoke.

Signed-off-by: Zach Brown <zab@versity.com>

2017-04-18 13:44:55 -07:00

kmod

Add simple debugging range locking layer

2017-04-18 13:44:55 -07:00

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