Zach Brown ec0fb5380a scoutfs: implement lock recovery ...

When a server crashes all the connected clients still have operational
locks and can be using them to protect IO.  As a new server starts up
its lock service needs to account for those outstanding locks before
granting new locks to clients.

This implements lock recovery by having the lock service recover locks
from clients as it starts up.

First the lock service stores records of connected clients in a btree
off the super block.  Records are added as the server receives their
greeting and are removed as the server receives their farewell.

Then the server checks for existing persistent records as it starts up.
If it finds any it enters recovery and waits for all the old clients to
reconnect before resuming normal processing.

We add lock recover request and response messages that are used to
communicate locks from the clients to the server.

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

2019-04-12 10:54:07 -07:00

kmod

scoutfs: implement lock recovery

2019-04-12 10:54:07 -07:00

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