drbd: allow parallel promote/demote actions

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We plan to use genl_family->parallel_ops = true in the future,
but need to review all possible interactions first.

For now, only selectively drop genl_lock() in drbd_set_role(),
instead serializing on our own internal resource->conf_update mutex.

We now can be promoted/demoted on many resources in parallel,
which may significantly improve cluster failover times
when fencing is required.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

...

This commit is contained in:

Lars Ellenberg 2014-04-28 18:43:22 +02:00 • committed by Jens Axboe

parent a910b12352

commit 9e276872fe

3 changed files with 88 additions and 14 deletions

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1

drivers/block/drbd/drbd_int.h

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1

drivers/block/drbd/drbd_main.c

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100

drivers/block/drbd/drbd_nl.c

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